Crystallized lithium fluoride(LiF)melts at 848℃ upon heating,and evaporates subsequently at a remarkably high temperature of 1673℃,characterizing its excellent thermally stability as one of the most representative m...Crystallized lithium fluoride(LiF)melts at 848℃ upon heating,and evaporates subsequently at a remarkably high temperature of 1673℃,characterizing its excellent thermally stability as one of the most representative metal halides.The marriage between Li F and rechargeable batteries dates back to early activities related to the electrochemical properties of lithium metal(Li°)negative electrodes,in which the nonaqueous electrolytes containing fluorinated salts were generally employed,e.g.,lithium tetrafluoroborate(LiBF_(4)),lithium hexafluoroarsenate(LiAsF_(6)),lithium trifluoromethanesulfonate(CF_(3)SO_(3)Li)[1].展开更多
The practical deployment of lithium metal batteries remains severely constrained,especially under elevated temperatures.Although metal-organic frameworks(MOFs)improve the thermal stability of liquid electrolytes by ca...The practical deployment of lithium metal batteries remains severely constrained,especially under elevated temperatures.Although metal-organic frameworks(MOFs)improve the thermal stability of liquid electrolytes by capturing them in well-ordered sub-nanopores,interparticle voids between MOF particles readily absorb liquid electrolyte,obscuring our understanding of the intrinsic role of nanopores in directing Li^(+)transport.To address this challenge,we introduce a one-dimensional(1D)MOF model architecture that eliminates interparticle effects and enables direct observation of Li^(+)solvation and de-solvation dynamics.Comparative studies of 1D HKUST-1 and ZIF-8 uncover distinct transport behaviors,supported by both experimental measurements and neural network potential-based molecular dynamics simulations.Building on these insights,we construct a hierarchical core-shell MOF architecture by integrating ZIF-8(core)and HKUST-1(shell)onto a hybrid fiber scaffold.This design harnesses the complementary strengths of both MOFs to achieve continuous ion pathways,directional Li^(+)conduction,and improved thermal and electrochemical resilience.展开更多
Lithium-oxygen(Li-O_(2))battery is favored among“beyond lithiumion”technologies for sustainability because of its exceptional energy density.Major impediments are the poor cycle stability and grievous capacity degra...Lithium-oxygen(Li-O_(2))battery is favored among“beyond lithiumion”technologies for sustainability because of its exceptional energy density.Major impediments are the poor cycle stability and grievous capacity degradation at high current densities.We address these issues by a“killing two birds with one stone”O_(2)-pressure protocol.It first resolves efficient O_(2) mass transport at high rates..The accelerated reaction kinetics optimizes the composition and growth pathway of discharge products.This protocol secondly achieves protection of Li anodes via densifying corrosion layers on them.Consequently,the battery delivers both ultrahigh discharge capacity(>9,000 mAh g^(-1))at 3,000 mA g^(-1) and excellent cycling stability.Under a dual-strategy effect of high-pressure O_(2) and artificial protection layers,the battery actualizes over 11-fold increase in cycle life of 5,170 h(2,585 cycles).The strategy opens avenues for advancing Li-O_(2) batteries towards practical application and confers the extension to other gas-based batteries.展开更多
Anode-free lithium-metal batteries(AFLMBs)offer high energy density.However,lithium dendrite growth and interfacial instability remain critical obstacles to their commercialization.Here,lithiophilic nanosized(∼5 nm)L...Anode-free lithium-metal batteries(AFLMBs)offer high energy density.However,lithium dendrite growth and interfacial instability remain critical obstacles to their commercialization.Here,lithiophilic nanosized(∼5 nm)LixSn combined with an inorganic-rich@polymer dual-layer structure was constructed on a Cu current collector,prepared via a galvanostatic process using a dual-lithium salt electrolyte in a Cu||Cu configuration.The polymer outer layer,initiated by LixSn,reinforces the solid electrolyte interphase(SEI),providing mechanical robustness and enabling stable cycling in an ether-based electrolyte.Furthermore,the Sn and LixSn particle sizes can be effectively tuned by adjusting the galvanostatic discharge current.The nanosized LixSn significantly lowers the nucleation overpotential and creates abundant lithiophilic nucleation sites,resulting in uniform,dense Li plating/stripping.The modified Cu collector demonstrates superior performance in ether-based electrolytes,achieving over 92%capacity retention after 100 cycles at a current density of 1.5 mA cm^(−2)and an area capacity of 1.1 mAh cm^(−2).This work provides a simple,eco-friendly,and scalable approach for fabricating high-performance anode-free current collectors for AFLMBs.展开更多
Polymer-electrolyte-based solid-state Li metal batteries with high-voltage Ni-rich cathodes are promising energy storage technologies owing to their favorable security and high energy densities.However,operating in wi...Polymer-electrolyte-based solid-state Li metal batteries with high-voltage Ni-rich cathodes are promising energy storage technologies owing to their favorable security and high energy densities.However,operating in wide temperature range and at high voltage is a tough challenge for them.Herein,F/N donating fluorinated-amide-based plasticizers regulated polymer electrolyte capable of enabling high-voltage Li||LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)batteries with excellent performance in wide temperature range is developed.F/N donating fluorinated-amide-based plasticizers significantly improve ionic conductivity(1.52 mS/cm at 30℃),enhance oxidation stability(5.0 V vs.Li^(+)/Li)and fabricate robust LiF/Li_(3)N-rich electrode-electrolyte interphases,which significantly improve the interface stability of Li metal anode and NCM811 cathode.The designed polymer electrolyte is nonflammable and has excellent dimensional stability at 200℃.Capitalizing on these advantageous attributes,the Li||NCM811 cells show excellent cycle stability and rate capability from−20℃ to 60℃ at high voltages(∼4.6 V),and under high-loading full cell condition,which display impressive capacity retention of 84.4%after 1000 cycles and ultrahigh capacity of 154.8 mAh/g at 10 C.This work provides a rational design strategy of polymer electrolytes for wide-temperature high-energy solid-state Li metal batteries.展开更多
High-pressure electrides,characterized by the presence of interstitial quasi-atoms(ISQs),possess unique electronic structures and physical properties,such as diverse dimensions of electride states exhibiting different...High-pressure electrides,characterized by the presence of interstitial quasi-atoms(ISQs),possess unique electronic structures and physical properties,such as diverse dimensions of electride states exhibiting different superconductivity,which has attracted significant attention.Here,we report a new electron-deficient type of electride Li_(4)Al and identify its phase transition progress with pressurization,where the internal driving force behind phase transitions,bonding characteristics,and superconducting behaviors have been revealed based on first-principles density functional theory.Through analysis of the bonding properties of electride Li_(4)Al,we demonstrate that the ISQs exhibiting increasingly covalent characteristics between Al ions play a critical role in driving the phase transition.Our electron–phonon coupling calculations indicate that all phases exhibit superconducting behaviors.Importantly,we prove that the ISQs behave as free electrons and demonstrate that the factor governing T_(c) is primarily derived from Li-p-hybridized electronic states with ISQ compositions.These electronic states are scattered by low-frequency phonons arising from mixed vibrations of Li and Al affected by ISQs to enhance electron–phonon coupling.Our study largely expands the research scope of electrides,provides new insight for understanding phase transitions,and elucidates the effects of ISQs on superconducting behavior.展开更多
Traditional Chinese medicine has opened new pathways and provided fresh perspectives for the treatment of uremic pruritus(UP)through syndrome differentiation and treatment.This paper summarizes the clinical experience...Traditional Chinese medicine has opened new pathways and provided fresh perspectives for the treatment of uremic pruritus(UP)through syndrome differentiation and treatment.This paper summarizes the clinical experience of Professor Li Qi in treating this condition.Professor Li Qi points out that the fundamental pathogenesis of UP lies in yang deficiency of the spleen and kidney.On this basis,either external cold entering the interior or yang deficiency leading to cold congelation may result in malnutrition of the skin,thereby triggering pruritus.In clinical practice,slight sweating therapy is applied to release the exterior and expel pathogenic factors or to warm and resolve cold fluid retention,achieving satisfactory therapeutic outcomes.展开更多
Born in Penglai,Shandong Province in 1942,Jiang Baolin is currently working as a doctoral supervisor at the Chinese National Academy of Arts.He’s also a committee member and researcher at the China National Academy o...Born in Penglai,Shandong Province in 1942,Jiang Baolin is currently working as a doctoral supervisor at the Chinese National Academy of Arts.He’s also a committee member and researcher at the China National Academy of Painting.He graduated from Zhejiang Academy of Fine Arts(now China Academy of Art),studying under such masters as Lu Yanshao and Gu Kunbo,and later pursued his master’s degree at the Central Academy of Fine Arts,sitting at the feet of masters like Li Keran.展开更多
Sulfide-based all-solid-state lithium metal batteries(ASSLMBs)have garnered significant attention due to their potential for high energy density and enhanced safety.However,their practical application is hindered by c...Sulfide-based all-solid-state lithium metal batteries(ASSLMBs)have garnered significant attention due to their potential for high energy density and enhanced safety.However,their practical application is hindered by challenges such as uneven lithium(Li)deposition and the growth of Li dendrites.In this contribution,we propose an amorphous fluorinated interphase(AFI),composed of amorphous LiF and lithiated graphite,to regulate the interfacial Li-ion transport kinetics through in-situ interface chemistry.Amorphous LiF,which exhibits a significantly enhanced Li-ion diffusion compared to its crystalline counterpart,works synergistically with lithiated graphite to promote both short-range and long-range Li-ion transport kinetics at the Li/electrolyte interface.As a result,the Li anode with AFI demonstrates a remarkably enhanced critical current density of 1.6 mA cm^(−2)and an extended cycle life exceeding 1100 h.The Li||LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)full cell also achieves a high discharge capacity of 125.7 mA h g^(−1)and retains 71.2%of its initial capacity after 200 cycles.This work provides valuable insights into the rational design of artificial anodic interphase to regulate interfacial Li-ion transport kinetics in ASSLMBs.展开更多
All-solid-state Li batteries(ASSLBs)using solid electrolytes(SEs)have gained significant attention in recent years considering the safety issue and their high energy density.Despite these advantages,the commercializat...All-solid-state Li batteries(ASSLBs)using solid electrolytes(SEs)have gained significant attention in recent years considering the safety issue and their high energy density.Despite these advantages,the commercialization of ASSLBs still faces challenges regarding the electrolyte/electrodes interfaces and growth of Li dendrites.Elemental doping is an effective and direct method to enhance the performance of SEs.Here,we report an Al-F co-doping strategy to improve the overall properties including ion conductivity,high voltage stability,and cathode and anode compatibility.Particularly,the Al-F co-doping enables the formation of a thin Li-Al alloy layer and fluoride interphases,thereby constructing a relatively stable interface and promoting uniform Li deposition.The similar merits of Al-F co-doping are also revealed in the Li-argyrodite series.ASSLBs assembled with these optimized electrolytes gain good electrochemical performance,demonstrating the universality of Al-F co-doping towards advanced SEs.展开更多
The effect of trace addition of 0.1wt%Y on the grain refinement and mechanical properties of Al-2.2Li-1.5Cu-0.5Mg-1Zn-0.2Zr-0.2Sc alloys at as-cast and heat-treated states was investigated.Results show that the additi...The effect of trace addition of 0.1wt%Y on the grain refinement and mechanical properties of Al-2.2Li-1.5Cu-0.5Mg-1Zn-0.2Zr-0.2Sc alloys at as-cast and heat-treated states was investigated.Results show that the addition of 0.1wt%Y into the Al-2.2Li-1.5Cu-0.5Mg-1Zn-0.2Zr-0.2Sc alloys can elevate the nucleation temperature of the Al_(3)(Sc,Zr)phase,leading to the preferential precipitation of the Al_(3)(Sc,Zr)phase and increasing the amount of Al_(3)(Sc,Zr)phase in the matrix.Al_(3)(Sc,Zr)phase can also act as a heterogeneous nucleation site in theα-Al matrix to promote nucleation and refine grains.The addition of element Y changes the precipitation phase characteristics at the grain boundaries in the as-cast alloy,which changes the distribution characteristics of secondary phases from initially continuous and coarse strip-like distribution at grain boundaries into the discontinuous dot-like and rod-like distribution.Besides,the size of secondary phases becomes smaller and their amount increases.Under the combined effects of grain refinement strengthening and precipitation strengthening,the Al-2.2Li-1.5Cu-0.5Mg-1Zn-0.2Zr-0.2Sc-0.1Y alloy after 175℃/10 h aging treatment achieves an ultimate tensile strength of 412 MPa and an elongation of 6.3%.Compared with those of the alloy without Y addition,the ultimate tensile strength and elongation of the added alloy increase by 16.1%and 53.7%,respectively.展开更多
Succinonitrile(SN)-based polymer plastic crystal electrolytes(PPCEs)are regarded as promising candidates for lithium metal batteries but suffer from serious side reactions with Li metal.Herein,we propose a multi-dimen...Succinonitrile(SN)-based polymer plastic crystal electrolytes(PPCEs)are regarded as promising candidates for lithium metal batteries but suffer from serious side reactions with Li metal.Herein,we propose a multi-dimensional optimization strategy to alleviate the side reactions between SN and Li metal,and develop a highly stable poly-vinylethylene carbonate-based PPCE(PPCE-VEC).Moreover,we identify the intrinsic factors of multi-dimensional polymer structures on the electrolyte stability by three typical classes of polyesters.The PPCE-VEC constructed by in situ polymerization exhibits much better stability than poly-vinylene carbonate-based PPCE(PPCE-VCA)and poly-trifluoroethyl acrylate-based PPCE(PPCE-TFA),which is verified by its fewer SN-decomposition species in X-ray photoelectron spectroscopy(XPS)and outstanding full cell performance.The PPCE-VEC-enabled LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)full cell achieve 73.7%capacity retention after 1400 cycles,which outperforms PPCE-VCA-and PPCE-TFA-enabled full cells(61.9%and 46.9%).Spectral analysis and theoretical calculation reveal that the high solvation ability of the carbonyl site,flexible polymer chain,and homogeneous electrolyte phase of PPCE-VEC are favorable to maximizing competition coordination with Li^(+)to weaken the Li^(+)–SN binding and shape an anion-rich solvation structure.This optimized polymer-involved Li^(+)solvation enhances SN stability and facilitates the formation of B/F enriched solid-electrolyte interphase(SEI),thus significantly improving PPCE stability.展开更多
The water-quenched(WQ)2195 Al−Li alloy was subjected to stretching at different temperatures,from room temperature(RT)to−196℃(CT),to investigate the effect of cryogenic deformation on the aging precipitation behavior...The water-quenched(WQ)2195 Al−Li alloy was subjected to stretching at different temperatures,from room temperature(RT)to−196℃(CT),to investigate the effect of cryogenic deformation on the aging precipitation behaviors and mechanical properties.The precipitation kinetics of the T1 phase and the microstructures in peak aging state were investigated through the differential scanning calorimetric(DSC)tests and electron microscopy observation.The results show that−196℃deformation produces a high dislocation density,which promotes the precipitation of the T1 phase and refines its sizes significantly.In addition,the grain boundary precipitates(GBPs)of−196℃-stretched samples are suppressed considerably due to the high dislocation density in the grain interiors,which increases the ductility.In comparison,the strength remains nearly constant.Thus,it is indicated that cryogenic forming has the potential to provide the shape and property control for the manufacture of critical components of aluminum alloys.展开更多
文摘Crystallized lithium fluoride(LiF)melts at 848℃ upon heating,and evaporates subsequently at a remarkably high temperature of 1673℃,characterizing its excellent thermally stability as one of the most representative metal halides.The marriage between Li F and rechargeable batteries dates back to early activities related to the electrochemical properties of lithium metal(Li°)negative electrodes,in which the nonaqueous electrolytes containing fluorinated salts were generally employed,e.g.,lithium tetrafluoroborate(LiBF_(4)),lithium hexafluoroarsenate(LiAsF_(6)),lithium trifluoromethanesulfonate(CF_(3)SO_(3)Li)[1].
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.RS-2023-00217581)supported by the Nano&Material Technology Development Program through the National Research Foundation of Korea(NRF)funded by Ministry of Science and ICT(RS-2024-00406724)supported by Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(RS-2025-25430676)。
文摘The practical deployment of lithium metal batteries remains severely constrained,especially under elevated temperatures.Although metal-organic frameworks(MOFs)improve the thermal stability of liquid electrolytes by capturing them in well-ordered sub-nanopores,interparticle voids between MOF particles readily absorb liquid electrolyte,obscuring our understanding of the intrinsic role of nanopores in directing Li^(+)transport.To address this challenge,we introduce a one-dimensional(1D)MOF model architecture that eliminates interparticle effects and enables direct observation of Li^(+)solvation and de-solvation dynamics.Comparative studies of 1D HKUST-1 and ZIF-8 uncover distinct transport behaviors,supported by both experimental measurements and neural network potential-based molecular dynamics simulations.Building on these insights,we construct a hierarchical core-shell MOF architecture by integrating ZIF-8(core)and HKUST-1(shell)onto a hybrid fiber scaffold.This design harnesses the complementary strengths of both MOFs to achieve continuous ion pathways,directional Li^(+)conduction,and improved thermal and electrochemical resilience.
基金support from the Major basic research project of Natural Science Foundation of Shandong Province(No.ZR2023ZD12)Singapore National Research Foundation Investigatorship(No.NRFNRFI08-2022-0009)NUS R&G Postdoc Fellowship Program.
文摘Lithium-oxygen(Li-O_(2))battery is favored among“beyond lithiumion”technologies for sustainability because of its exceptional energy density.Major impediments are the poor cycle stability and grievous capacity degradation at high current densities.We address these issues by a“killing two birds with one stone”O_(2)-pressure protocol.It first resolves efficient O_(2) mass transport at high rates..The accelerated reaction kinetics optimizes the composition and growth pathway of discharge products.This protocol secondly achieves protection of Li anodes via densifying corrosion layers on them.Consequently,the battery delivers both ultrahigh discharge capacity(>9,000 mAh g^(-1))at 3,000 mA g^(-1) and excellent cycling stability.Under a dual-strategy effect of high-pressure O_(2) and artificial protection layers,the battery actualizes over 11-fold increase in cycle life of 5,170 h(2,585 cycles).The strategy opens avenues for advancing Li-O_(2) batteries towards practical application and confers the extension to other gas-based batteries.
基金supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT)(No. 2020R1A5A1019131)supported by a Korea Institute of Energy Technology Evaluation and Planning (KETEP)grant funded by the Korean government (MOTIE)(RS-2022-KP002703, Sector coupling energy industry advancement manpower training program)+1 种基金supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP)the Ministry of Trade,Industry&Energy(MOTIE) of the Republic of Korea (RS-2024-00469587)
文摘Anode-free lithium-metal batteries(AFLMBs)offer high energy density.However,lithium dendrite growth and interfacial instability remain critical obstacles to their commercialization.Here,lithiophilic nanosized(∼5 nm)LixSn combined with an inorganic-rich@polymer dual-layer structure was constructed on a Cu current collector,prepared via a galvanostatic process using a dual-lithium salt electrolyte in a Cu||Cu configuration.The polymer outer layer,initiated by LixSn,reinforces the solid electrolyte interphase(SEI),providing mechanical robustness and enabling stable cycling in an ether-based electrolyte.Furthermore,the Sn and LixSn particle sizes can be effectively tuned by adjusting the galvanostatic discharge current.The nanosized LixSn significantly lowers the nucleation overpotential and creates abundant lithiophilic nucleation sites,resulting in uniform,dense Li plating/stripping.The modified Cu collector demonstrates superior performance in ether-based electrolytes,achieving over 92%capacity retention after 100 cycles at a current density of 1.5 mA cm^(−2)and an area capacity of 1.1 mAh cm^(−2).This work provides a simple,eco-friendly,and scalable approach for fabricating high-performance anode-free current collectors for AFLMBs.
基金supported by the Science Foundation of High-Level Talents of Wuyi University(Nos.2019AL017,2021AL002).
文摘Polymer-electrolyte-based solid-state Li metal batteries with high-voltage Ni-rich cathodes are promising energy storage technologies owing to their favorable security and high energy densities.However,operating in wide temperature range and at high voltage is a tough challenge for them.Herein,F/N donating fluorinated-amide-based plasticizers regulated polymer electrolyte capable of enabling high-voltage Li||LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)batteries with excellent performance in wide temperature range is developed.F/N donating fluorinated-amide-based plasticizers significantly improve ionic conductivity(1.52 mS/cm at 30℃),enhance oxidation stability(5.0 V vs.Li^(+)/Li)and fabricate robust LiF/Li_(3)N-rich electrode-electrolyte interphases,which significantly improve the interface stability of Li metal anode and NCM811 cathode.The designed polymer electrolyte is nonflammable and has excellent dimensional stability at 200℃.Capitalizing on these advantageous attributes,the Li||NCM811 cells show excellent cycle stability and rate capability from−20℃ to 60℃ at high voltages(∼4.6 V),and under high-loading full cell condition,which display impressive capacity retention of 84.4%after 1000 cycles and ultrahigh capacity of 154.8 mAh/g at 10 C.This work provides a rational design strategy of polymer electrolytes for wide-temperature high-energy solid-state Li metal batteries.
基金supported by the National Key Research and Development Program of China (Grant Nos.2023YFA1406200 and 2022YFA-1405500)the National Natural Science Foundation of China (Grant Nos.12304021 and 52072188)+3 种基金Zhejiang Provincial Natural Science Foundation of China (Grant Nos.LQ23A040004 and MS26A040028)Natural Science Foundation of Ningbo (Grant Nos.2022J091 and ZX2025001430)the Program for Science and Technology Innovation Team in Zhejiang (Grant No.2021R01004)the Program for Changjiang Scholars and Innovative Research Team in University (Grant No.IRT_15R23)。
文摘High-pressure electrides,characterized by the presence of interstitial quasi-atoms(ISQs),possess unique electronic structures and physical properties,such as diverse dimensions of electride states exhibiting different superconductivity,which has attracted significant attention.Here,we report a new electron-deficient type of electride Li_(4)Al and identify its phase transition progress with pressurization,where the internal driving force behind phase transitions,bonding characteristics,and superconducting behaviors have been revealed based on first-principles density functional theory.Through analysis of the bonding properties of electride Li_(4)Al,we demonstrate that the ISQs exhibiting increasingly covalent characteristics between Al ions play a critical role in driving the phase transition.Our electron–phonon coupling calculations indicate that all phases exhibit superconducting behaviors.Importantly,we prove that the ISQs behave as free electrons and demonstrate that the factor governing T_(c) is primarily derived from Li-p-hybridized electronic states with ISQ compositions.These electronic states are scattered by low-frequency phonons arising from mixed vibrations of Li and Al affected by ISQs to enhance electron–phonon coupling.Our study largely expands the research scope of electrides,provides new insight for understanding phase transitions,and elucidates the effects of ISQs on superconducting behavior.
基金Supported by National Program for Inheriting the Academic Experience of Senior TCM Experts(Seventh Batch),National Administration of Traditional Chinese Medicine([2022]No.76)Yunnan Provincial Collaborative Research Project on Major and Difficult Diseases with Integrated Traditional Chinese and Western Medicine(Yun Cai She No.163[2024])-Chronic Renal Failure(300072)Yunnan Provincial Senior TCM Expert Li Qi Heritage Studio Project.
文摘Traditional Chinese medicine has opened new pathways and provided fresh perspectives for the treatment of uremic pruritus(UP)through syndrome differentiation and treatment.This paper summarizes the clinical experience of Professor Li Qi in treating this condition.Professor Li Qi points out that the fundamental pathogenesis of UP lies in yang deficiency of the spleen and kidney.On this basis,either external cold entering the interior or yang deficiency leading to cold congelation may result in malnutrition of the skin,thereby triggering pruritus.In clinical practice,slight sweating therapy is applied to release the exterior and expel pathogenic factors or to warm and resolve cold fluid retention,achieving satisfactory therapeutic outcomes.
文摘Born in Penglai,Shandong Province in 1942,Jiang Baolin is currently working as a doctoral supervisor at the Chinese National Academy of Arts.He’s also a committee member and researcher at the China National Academy of Painting.He graduated from Zhejiang Academy of Fine Arts(now China Academy of Art),studying under such masters as Lu Yanshao and Gu Kunbo,and later pursued his master’s degree at the Central Academy of Fine Arts,sitting at the feet of masters like Li Keran.
基金supported by the Beijing Municipal Natural Science Foundation(L223009)the National Natural Science Foundation of China(22209014,22479012)+1 种基金the Hebei Natural Science Foundation(E2024208084)the Fundamental Research Funds for the Central Universities(2023CX01031)。
文摘Sulfide-based all-solid-state lithium metal batteries(ASSLMBs)have garnered significant attention due to their potential for high energy density and enhanced safety.However,their practical application is hindered by challenges such as uneven lithium(Li)deposition and the growth of Li dendrites.In this contribution,we propose an amorphous fluorinated interphase(AFI),composed of amorphous LiF and lithiated graphite,to regulate the interfacial Li-ion transport kinetics through in-situ interface chemistry.Amorphous LiF,which exhibits a significantly enhanced Li-ion diffusion compared to its crystalline counterpart,works synergistically with lithiated graphite to promote both short-range and long-range Li-ion transport kinetics at the Li/electrolyte interface.As a result,the Li anode with AFI demonstrates a remarkably enhanced critical current density of 1.6 mA cm^(−2)and an extended cycle life exceeding 1100 h.The Li||LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)full cell also achieves a high discharge capacity of 125.7 mA h g^(−1)and retains 71.2%of its initial capacity after 200 cycles.This work provides valuable insights into the rational design of artificial anodic interphase to regulate interfacial Li-ion transport kinetics in ASSLMBs.
基金supported by the National Natural Science Foundation of China(Nos.52172243,52371215)。
文摘All-solid-state Li batteries(ASSLBs)using solid electrolytes(SEs)have gained significant attention in recent years considering the safety issue and their high energy density.Despite these advantages,the commercialization of ASSLBs still faces challenges regarding the electrolyte/electrodes interfaces and growth of Li dendrites.Elemental doping is an effective and direct method to enhance the performance of SEs.Here,we report an Al-F co-doping strategy to improve the overall properties including ion conductivity,high voltage stability,and cathode and anode compatibility.Particularly,the Al-F co-doping enables the formation of a thin Li-Al alloy layer and fluoride interphases,thereby constructing a relatively stable interface and promoting uniform Li deposition.The similar merits of Al-F co-doping are also revealed in the Li-argyrodite series.ASSLBs assembled with these optimized electrolytes gain good electrochemical performance,demonstrating the universality of Al-F co-doping towards advanced SEs.
基金National Natural Science Foundation of China(52071065)Fundamental Research Funds for the Central Universities(N2007007)+2 种基金Joint Fund of Henan Province Science and Technology R&D Program(N225200810040)High-Level Talent Research Start-Up Project Funding of Henan Academy of Sciences(N242017003)Liaoning Provincial Department of Education Basic Research Projects for Colleges and Universities(LJ212410142093)。
文摘The effect of trace addition of 0.1wt%Y on the grain refinement and mechanical properties of Al-2.2Li-1.5Cu-0.5Mg-1Zn-0.2Zr-0.2Sc alloys at as-cast and heat-treated states was investigated.Results show that the addition of 0.1wt%Y into the Al-2.2Li-1.5Cu-0.5Mg-1Zn-0.2Zr-0.2Sc alloys can elevate the nucleation temperature of the Al_(3)(Sc,Zr)phase,leading to the preferential precipitation of the Al_(3)(Sc,Zr)phase and increasing the amount of Al_(3)(Sc,Zr)phase in the matrix.Al_(3)(Sc,Zr)phase can also act as a heterogeneous nucleation site in theα-Al matrix to promote nucleation and refine grains.The addition of element Y changes the precipitation phase characteristics at the grain boundaries in the as-cast alloy,which changes the distribution characteristics of secondary phases from initially continuous and coarse strip-like distribution at grain boundaries into the discontinuous dot-like and rod-like distribution.Besides,the size of secondary phases becomes smaller and their amount increases.Under the combined effects of grain refinement strengthening and precipitation strengthening,the Al-2.2Li-1.5Cu-0.5Mg-1Zn-0.2Zr-0.2Sc-0.1Y alloy after 175℃/10 h aging treatment achieves an ultimate tensile strength of 412 MPa and an elongation of 6.3%.Compared with those of the alloy without Y addition,the ultimate tensile strength and elongation of the added alloy increase by 16.1%and 53.7%,respectively.
基金supported by the National Natural Science Foundation of China(22072048)the Guangdong Provincial Department of Science and Technology(2021A1515010128 and 2022A0505050013).
文摘Succinonitrile(SN)-based polymer plastic crystal electrolytes(PPCEs)are regarded as promising candidates for lithium metal batteries but suffer from serious side reactions with Li metal.Herein,we propose a multi-dimensional optimization strategy to alleviate the side reactions between SN and Li metal,and develop a highly stable poly-vinylethylene carbonate-based PPCE(PPCE-VEC).Moreover,we identify the intrinsic factors of multi-dimensional polymer structures on the electrolyte stability by three typical classes of polyesters.The PPCE-VEC constructed by in situ polymerization exhibits much better stability than poly-vinylene carbonate-based PPCE(PPCE-VCA)and poly-trifluoroethyl acrylate-based PPCE(PPCE-TFA),which is verified by its fewer SN-decomposition species in X-ray photoelectron spectroscopy(XPS)and outstanding full cell performance.The PPCE-VEC-enabled LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)full cell achieve 73.7%capacity retention after 1400 cycles,which outperforms PPCE-VCA-and PPCE-TFA-enabled full cells(61.9%and 46.9%).Spectral analysis and theoretical calculation reveal that the high solvation ability of the carbonyl site,flexible polymer chain,and homogeneous electrolyte phase of PPCE-VEC are favorable to maximizing competition coordination with Li^(+)to weaken the Li^(+)–SN binding and shape an anion-rich solvation structure.This optimized polymer-involved Li^(+)solvation enhances SN stability and facilitates the formation of B/F enriched solid-electrolyte interphase(SEI),thus significantly improving PPCE stability.
基金financially supported by the National Key Research and Development Program of China (No. 2019YFA0708801)the National Natural Science Foundation of China (No. 51875125)。
文摘The water-quenched(WQ)2195 Al−Li alloy was subjected to stretching at different temperatures,from room temperature(RT)to−196℃(CT),to investigate the effect of cryogenic deformation on the aging precipitation behaviors and mechanical properties.The precipitation kinetics of the T1 phase and the microstructures in peak aging state were investigated through the differential scanning calorimetric(DSC)tests and electron microscopy observation.The results show that−196℃deformation produces a high dislocation density,which promotes the precipitation of the T1 phase and refines its sizes significantly.In addition,the grain boundary precipitates(GBPs)of−196℃-stretched samples are suppressed considerably due to the high dislocation density in the grain interiors,which increases the ductility.In comparison,the strength remains nearly constant.Thus,it is indicated that cryogenic forming has the potential to provide the shape and property control for the manufacture of critical components of aluminum alloys.
