As polar materials, transition-metal oxides have shown great potentials to improve the adsorption of lithium polysulfides in lithium-sulfur batteries. Herein, a MoO_2-ordered mesoporous carbon (M-OMC)hybrid was design...As polar materials, transition-metal oxides have shown great potentials to improve the adsorption of lithium polysulfides in lithium-sulfur batteries. Herein, a MoO_2-ordered mesoporous carbon (M-OMC)hybrid was designed as the sulfur host, in which MoO_2 is inlaid on the surface of ordered mesoporous carbons that can store active materials and provide fast electron transfer channel due to its ordered pore structure. The MoO_2 can effectively prevent the migration of polysulfides through the chemical adsorption and promote the conversion of polysulfides towards Li-sulfur battery.展开更多
Ethers are promising electrolyte solvents for secondary Li metal batteries because of their excellent reduction stability.However,their oxidation stability has been mostly relying on the high concentration approach,an...Ethers are promising electrolyte solvents for secondary Li metal batteries because of their excellent reduction stability.However,their oxidation stability has been mostly relying on the high concentration approach,and limited progress has been made on building effective interphase to protect the cathode from the corrosion of the electrolyte.In this work,we construct a semi-crystalline interfacial layer on the surface of Li(Ni_(0.8)Co_(0.1)Mn_(0.1))O_(2)cathode that can achieve improved electrochemical stability in the highly corrosive chemical environment formed by the decomposition of ether molecules.Different from traditional brittle crystalline interphases,the optimized semi-crystalline layer with low modulus and high ionic conductivity can effectively relieve electrode strain and maintain the integrity of the interface layer.Due to this design,the continuous oxidation decomposition of ether-based electrolytes could be significantly suppressed and the battery shows outstanding cycling stability(84%capacity retention after 300 cycles).This article provides a solution to address the oxidation instability issue of ether-based electrolytes.展开更多
This paper analyzes the related concepts of green buildings and hydraulic ecological glass,and explains in detail the market competitiveness of hydraulic ecological glass in green buildings.Finally,it analyzes the con...This paper analyzes the related concepts of green buildings and hydraulic ecological glass,and explains in detail the market competitiveness of hydraulic ecological glass in green buildings.Finally,it analyzes the concept of hydraulic ecological glass design,and summarizes the universality and importance of hydraulic ecological glass in green buildings and modern housing.Through the analysis and application of green building design concept in housing and environment,it is concluded that hydraulic ecological glass has good market competitiveness,and its promotion will have a better impact on the whole green building.展开更多
Recognizing the critical role of electrolyte chemistry and electrode interfaces in the performance and safety of lithium batteries,along with the urgent need for more sophisticated methods of analysis,this comprehensi...Recognizing the critical role of electrolyte chemistry and electrode interfaces in the performance and safety of lithium batteries,along with the urgent need for more sophisticated methods of analysis,this comprehensive review underscores the promise of machine learning(ML)models in this research field.It explores the application of these innovative methods to studying battery interfaces,particularly focusing on lithium metal anodes.Amid the limitations of traditional experimental techniques,the review supports a hybrid approach that couples experimental and simulation methods,enabling granular insights into the formation process and characteristics of battery interfaces at the molecular level and harnessing AI to extract patterns from voluminous data sets.It showcases the utility of such techniques in electrolyte design and battery life prediction and introduces a novel perspective on battery interface mechanisms.The review concludes by asserting the potential of artificial intelligence(AI)or ML models as invaluable tools in the future of battery research and highlights the importance of fostering confidence in these technologies within the scientific community.展开更多
The advancement of millimeter-wave communication desires the ceramic substrate with low permittivity(ԑ_(r))to meet the requirements of high transmission rates,low latency and wide bandwidth.However,the thermal conduct...The advancement of millimeter-wave communication desires the ceramic substrate with low permittivity(ԑ_(r))to meet the requirements of high transmission rates,low latency and wide bandwidth.However,the thermal conductivity of most low-ԑ_(r)ceramics is too low to deal with heat dissipation in millimeter-wave applications.In this paper,we reported novel dielectric ceramics LiMSiO_(4)(M=Ga,Sc and Y)with excellent performances of low ԑ_(r)(<10)and high thermal conductivity(>6 W mK^(−1)).Their dielectric properties in both microwave and THz were investigated,where the LiGaSiO_(4)ceramic achieved the lowest ԑ_(r)of∼5.2,the LiScSiO_(4)ceramic presented extremely low loss(Q×f∼96,700 GHz,Q=1/dielectric loss,f is resonant frequency),and the LiYSiO_(4)ceramic showed a positive temperature coefficient of f(TCF∼+32 ppm℃^(−1)).The distinct dielectric behavior was subsequently studied by structure-performance relationship in terms of M-site cations and bond parameters using bond valence theory,Phillips-Van Vechten-Levine chemical bond theory and so on.Moreover,a 36 GHz microstrip array antenna was designed and simulated using the LiGaSiO_(4) ceramic substrate,obtaining high realized gain,high radiation efficiency and low sidelobe.The result demonstrated the great potential of LiMSiO_(4)-type dielectric ceramics in millimeter-wave communications.展开更多
Nitriles as efficient electrolyte additives are widely used in high-voltage lithium-ion batteries.However,their working mechanisms are still mysterious,especially in practical high-voltage LiCoO_(2)pouch lithium-ion b...Nitriles as efficient electrolyte additives are widely used in high-voltage lithium-ion batteries.However,their working mechanisms are still mysterious,especially in practical high-voltage LiCoO_(2)pouch lithium-ion batteries.Herein,we adopt a tridentate ligandcontaining 1,3,6-hexanetricarbonitrile(HTCN)as an effective electrolyte additive to shed light on the mechanism of stabilizing high-voltage LiCoO_(2)cathode(4.5 V)through nitriles.The LiCoO_(2)/graphite pouch cells with the HTCN additive electrolyte possess superior cycling performance,90%retention of the initial capacity after 800 cycles at 25℃,and 72%retention after 500 cycles at 45℃,which is feasible for practical application.Such an excellent cycling performance can be attributed to the stable interface:The HTCN molecules with strong electron-donating ability participate in the construction of cathode-electrolyte interphase(CEI)through coordinating with Co ions,which suppresses the decomposition of electrolyte and improves the structural stability of LiCoO_(2)during cycling.In summary,the work recognizes a coordinating-based interphase-forming mechanism as an effective strategy to optimize the performance of high voltage LiCoO_(2)cathode with appropriate electrolyte additives for practical pouch batteries.展开更多
This article presents low-firing,low-loss and temperature stable ZnO-TiO_(2)-Nb_(2)O_(5) microwave dielectric composite ceramics with the assistance of lithium borosilicate(LBS)and zinc borosilicate(ZBS)glass frits.Th...This article presents low-firing,low-loss and temperature stable ZnO-TiO_(2)-Nb_(2)O_(5) microwave dielectric composite ceramics with the assistance of lithium borosilicate(LBS)and zinc borosilicate(ZBS)glass frits.There is a liquid phase(eutectic mixture)generated by LBS(ZBS)glass,and solid particles could be wetted and dissolved.Therefore,the migrations and rearrangements of particles could be performed.Besides,compared with ceramics undoped with glass frits,lower activation energies(E_(a))of ceramics doped with LBS and ZBS glass suggest that the low-temperature sintering behavior is easier to carry out.The results indicated that LBS and ZBS glass both are effective sintering aids to accelerate the sintering process and improve the microwave dielectric properties of composite ceramics by controlling the phase compositions under low temperature.Combination great properties of ZnO-TiO_(2)-Nb_(2)O_(5) ceramics were obtained when sintered at 900℃ for 4 h:ε_(r)=36.7,Q×f=20,000 GHz,τ_(f)=7 ppm/℃.展开更多
Chitosan/glycerophosphate thermosensitive hydrogel crosslinked physically was a potential drug delivery carrier;however, long gelation time limits its application. Here, chitosan-amino acid (AA) thermosensitive hydrog...Chitosan/glycerophosphate thermosensitive hydrogel crosslinked physically was a potential drug delivery carrier;however, long gelation time limits its application. Here, chitosan-amino acid (AA) thermosensitive hydrogels were prepared from chitosan (CS), αβ-glycerophosphate (GP), and L-lysine (Lys) or L-glutamic acid (Glu). The prepared CS-Lys/GP and CS-Glu/GP hydrogel showed good thermosensitivity and could form gels in a short time. The optimal parameters of CS-Lys/GP hydrogel were that the concentration of CS-Lys was 2.5%, the ratio of CS/Lys was 3.5/1.0, the ratio of CS-Lys/GP was 4.5/1.0. The optimal parameters of CS-Glu/GP hydrogel were that the concentration of CS-Glu was 3.0%, the ratio of CS/Glu was 2.0/1.0, and the ratio of CS-Glu/GP was 4.0/1.5. Chitosan-amino acid (CS-AA) thermosensitive hydrogel had a three-dimensional network structure. The addition of model drug tinidazole (TNZ) had no obvious effect on the structure of hydrogel. The results of infrared spectroscopy showed that there were hydrogen bonds between amino acids and chitosan. In vitro release results showed that CS-Lys/GP and CS-Glu/GP thermosensitive hydrogels had sustained release effects. Thus, the chitosan-amino acid thermosensitive hydrogels hold great potential as a sustained release drug delivery system.展开更多
Enhancing the cut-off voltage of high-nickel layered oxide cathodes is an efficient way to obtain higher energy density of lithiummetal batteries(LMBs).However,the phase transition of the cathode materials and the unc...Enhancing the cut-off voltage of high-nickel layered oxide cathodes is an efficient way to obtain higher energy density of lithiummetal batteries(LMBs).However,the phase transition of the cathode materials and the uncontrolled decomposition of the electrolytes at high voltage can lead to irreversible dissolution of transition metal ions,which might cause the crossover effects on the lithium metal anodes.Nonetheless,the mechanism and electrolyte dependence of the crossover effects for Li metal anodes are still unclear.Herein,we investigate the crossover effects between LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)and Li-metal anode in two electrolyte systems.For ether-based electrolyte,its poor oxidation stability results in massive dissolution of transition metal ions,leading to dendrite growth on anode and rapid cells failure.Conversely,ester-based electrolyte exhibits good electrochemical performances at 4.5 V with little crossover effect.This study provides an idea for electrolyte systems selection for high-voltage LMBs,and verifies that the crossover effect should not be neglected in LMBs.展开更多
Lithium-sulfur(Li-S)batteries have attracted intensive attention owing to their ultrahigh theoretical energy density.Nevertheless,the practical application of Li-S batteries is prevented by uncontrollable shuttle effe...Lithium-sulfur(Li-S)batteries have attracted intensive attention owing to their ultrahigh theoretical energy density.Nevertheless,the practical application of Li-S batteries is prevented by uncontrollable shuttle effect and retarded reaction kinetics.To address the above issues,lithium fluoride(LiF)was employed to regulate the surface chemistry of routine separator.The functional separator demonstrates a great ability to suppress active S loss and protect lithium anode.This work provides a facile strategy for the development of advanced Li-S batteries.展开更多
基金supported by the National Natural Science Foundation of China(Nos. U1710109 and 51702182)Shenzhen Basic Research Project(No.JCYJ20150529164918734)
文摘As polar materials, transition-metal oxides have shown great potentials to improve the adsorption of lithium polysulfides in lithium-sulfur batteries. Herein, a MoO_2-ordered mesoporous carbon (M-OMC)hybrid was designed as the sulfur host, in which MoO_2 is inlaid on the surface of ordered mesoporous carbons that can store active materials and provide fast electron transfer channel due to its ordered pore structure. The MoO_2 can effectively prevent the migration of polysulfides through the chemical adsorption and promote the conversion of polysulfides towards Li-sulfur battery.
基金supported by the National Natural Science Foundation of China(22179124,21905265)the Fundamental Research Funds for the Central Universities(WK3430000007)。
文摘Ethers are promising electrolyte solvents for secondary Li metal batteries because of their excellent reduction stability.However,their oxidation stability has been mostly relying on the high concentration approach,and limited progress has been made on building effective interphase to protect the cathode from the corrosion of the electrolyte.In this work,we construct a semi-crystalline interfacial layer on the surface of Li(Ni_(0.8)Co_(0.1)Mn_(0.1))O_(2)cathode that can achieve improved electrochemical stability in the highly corrosive chemical environment formed by the decomposition of ether molecules.Different from traditional brittle crystalline interphases,the optimized semi-crystalline layer with low modulus and high ionic conductivity can effectively relieve electrode strain and maintain the integrity of the interface layer.Due to this design,the continuous oxidation decomposition of ether-based electrolytes could be significantly suppressed and the battery shows outstanding cycling stability(84%capacity retention after 300 cycles).This article provides a solution to address the oxidation instability issue of ether-based electrolytes.
基金Supported by National Innovation and Entrepreneurship Training Program for College Students in 2021(S202110414044)。
文摘This paper analyzes the related concepts of green buildings and hydraulic ecological glass,and explains in detail the market competitiveness of hydraulic ecological glass in green buildings.Finally,it analyzes the concept of hydraulic ecological glass design,and summarizes the universality and importance of hydraulic ecological glass in green buildings and modern housing.Through the analysis and application of green building design concept in housing and environment,it is concluded that hydraulic ecological glass has good market competitiveness,and its promotion will have a better impact on the whole green building.
基金supported by the National Key Research and Development Program of China(2022YFA1504102)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB0450302)+6 种基金the National Natural Science Foundation of China(52225105,22279127,52072358 and U21A2082)support from Suzhou Key Laboratory of Functional Nano&Soft Materialsthe Collaborative Innovation Center of Suzhou Nano Science&Technologythe Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)the Joint International Research Laboratory of Carbon-Based Functional Materials and Devices(the 111 Project)the National Natural Science Foundation of China(22173066)the National Key Research and Development Program of China(2022YFB2502200)
文摘Recognizing the critical role of electrolyte chemistry and electrode interfaces in the performance and safety of lithium batteries,along with the urgent need for more sophisticated methods of analysis,this comprehensive review underscores the promise of machine learning(ML)models in this research field.It explores the application of these innovative methods to studying battery interfaces,particularly focusing on lithium metal anodes.Amid the limitations of traditional experimental techniques,the review supports a hybrid approach that couples experimental and simulation methods,enabling granular insights into the formation process and characteristics of battery interfaces at the molecular level and harnessing AI to extract patterns from voluminous data sets.It showcases the utility of such techniques in electrolyte design and battery life prediction and introduces a novel perspective on battery interface mechanisms.The review concludes by asserting the potential of artificial intelligence(AI)or ML models as invaluable tools in the future of battery research and highlights the importance of fostering confidence in these technologies within the scientific community.
基金financially supported by the National Key Research and Development Program of China(No.2024YFE0103900)the National Natural Science Foundation of China(Nos.52202146 and 62271067)+1 种基金the Shaanxi Province University Joint Project(No.2023GXLH-019)the Fundamental Research Funds for the Central University.
文摘The advancement of millimeter-wave communication desires the ceramic substrate with low permittivity(ԑ_(r))to meet the requirements of high transmission rates,low latency and wide bandwidth.However,the thermal conductivity of most low-ԑ_(r)ceramics is too low to deal with heat dissipation in millimeter-wave applications.In this paper,we reported novel dielectric ceramics LiMSiO_(4)(M=Ga,Sc and Y)with excellent performances of low ԑ_(r)(<10)and high thermal conductivity(>6 W mK^(−1)).Their dielectric properties in both microwave and THz were investigated,where the LiGaSiO_(4)ceramic achieved the lowest ԑ_(r)of∼5.2,the LiScSiO_(4)ceramic presented extremely low loss(Q×f∼96,700 GHz,Q=1/dielectric loss,f is resonant frequency),and the LiYSiO_(4)ceramic showed a positive temperature coefficient of f(TCF∼+32 ppm℃^(−1)).The distinct dielectric behavior was subsequently studied by structure-performance relationship in terms of M-site cations and bond parameters using bond valence theory,Phillips-Van Vechten-Levine chemical bond theory and so on.Moreover,a 36 GHz microstrip array antenna was designed and simulated using the LiGaSiO_(4) ceramic substrate,obtaining high realized gain,high radiation efficiency and low sidelobe.The result demonstrated the great potential of LiMSiO_(4)-type dielectric ceramics in millimeter-wave communications.
基金supported by the National Key Research and Development Program of China(Nos.2017YFA0206700 and 2017YFA0402802)the National Natural Science Foundation of China(Nos.21776265 and 51902304)Anhui Provincial Natural Science Foundation(No.1908085ME122).
文摘Nitriles as efficient electrolyte additives are widely used in high-voltage lithium-ion batteries.However,their working mechanisms are still mysterious,especially in practical high-voltage LiCoO_(2)pouch lithium-ion batteries.Herein,we adopt a tridentate ligandcontaining 1,3,6-hexanetricarbonitrile(HTCN)as an effective electrolyte additive to shed light on the mechanism of stabilizing high-voltage LiCoO_(2)cathode(4.5 V)through nitriles.The LiCoO_(2)/graphite pouch cells with the HTCN additive electrolyte possess superior cycling performance,90%retention of the initial capacity after 800 cycles at 25℃,and 72%retention after 500 cycles at 45℃,which is feasible for practical application.Such an excellent cycling performance can be attributed to the stable interface:The HTCN molecules with strong electron-donating ability participate in the construction of cathode-electrolyte interphase(CEI)through coordinating with Co ions,which suppresses the decomposition of electrolyte and improves the structural stability of LiCoO_(2)during cycling.In summary,the work recognizes a coordinating-based interphase-forming mechanism as an effective strategy to optimize the performance of high voltage LiCoO_(2)cathode with appropriate electrolyte additives for practical pouch batteries.
基金financial supports from the National Natural Science Foundation of China(No.51872037).
文摘This article presents low-firing,low-loss and temperature stable ZnO-TiO_(2)-Nb_(2)O_(5) microwave dielectric composite ceramics with the assistance of lithium borosilicate(LBS)and zinc borosilicate(ZBS)glass frits.There is a liquid phase(eutectic mixture)generated by LBS(ZBS)glass,and solid particles could be wetted and dissolved.Therefore,the migrations and rearrangements of particles could be performed.Besides,compared with ceramics undoped with glass frits,lower activation energies(E_(a))of ceramics doped with LBS and ZBS glass suggest that the low-temperature sintering behavior is easier to carry out.The results indicated that LBS and ZBS glass both are effective sintering aids to accelerate the sintering process and improve the microwave dielectric properties of composite ceramics by controlling the phase compositions under low temperature.Combination great properties of ZnO-TiO_(2)-Nb_(2)O_(5) ceramics were obtained when sintered at 900℃ for 4 h:ε_(r)=36.7,Q×f=20,000 GHz,τ_(f)=7 ppm/℃.
基金support from Natural Science Foundation of Henan Province(No.182300410213)National Natural Science Foundation of China(No.51103035).
文摘Chitosan/glycerophosphate thermosensitive hydrogel crosslinked physically was a potential drug delivery carrier;however, long gelation time limits its application. Here, chitosan-amino acid (AA) thermosensitive hydrogels were prepared from chitosan (CS), αβ-glycerophosphate (GP), and L-lysine (Lys) or L-glutamic acid (Glu). The prepared CS-Lys/GP and CS-Glu/GP hydrogel showed good thermosensitivity and could form gels in a short time. The optimal parameters of CS-Lys/GP hydrogel were that the concentration of CS-Lys was 2.5%, the ratio of CS/Lys was 3.5/1.0, the ratio of CS-Lys/GP was 4.5/1.0. The optimal parameters of CS-Glu/GP hydrogel were that the concentration of CS-Glu was 3.0%, the ratio of CS/Glu was 2.0/1.0, and the ratio of CS-Glu/GP was 4.0/1.5. Chitosan-amino acid (CS-AA) thermosensitive hydrogel had a three-dimensional network structure. The addition of model drug tinidazole (TNZ) had no obvious effect on the structure of hydrogel. The results of infrared spectroscopy showed that there were hydrogen bonds between amino acids and chitosan. In vitro release results showed that CS-Lys/GP and CS-Glu/GP thermosensitive hydrogels had sustained release effects. Thus, the chitosan-amino acid thermosensitive hydrogels hold great potential as a sustained release drug delivery system.
基金supported by the National Natural Science Foundation of China(Nos.51902304,52072358,U21A2082,22279127,and 52225105).
文摘Enhancing the cut-off voltage of high-nickel layered oxide cathodes is an efficient way to obtain higher energy density of lithiummetal batteries(LMBs).However,the phase transition of the cathode materials and the uncontrolled decomposition of the electrolytes at high voltage can lead to irreversible dissolution of transition metal ions,which might cause the crossover effects on the lithium metal anodes.Nonetheless,the mechanism and electrolyte dependence of the crossover effects for Li metal anodes are still unclear.Herein,we investigate the crossover effects between LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)and Li-metal anode in two electrolyte systems.For ether-based electrolyte,its poor oxidation stability results in massive dissolution of transition metal ions,leading to dendrite growth on anode and rapid cells failure.Conversely,ester-based electrolyte exhibits good electrochemical performances at 4.5 V with little crossover effect.This study provides an idea for electrolyte systems selection for high-voltage LMBs,and verifies that the crossover effect should not be neglected in LMBs.
基金supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0402802 and 2017YFA0206700)the National Natural Science Foundation of China(Grant Nos.21776265 and 51902304)+1 种基金the Natural Science Foundation of Anhui Province(Grant No.1908085ME122)the Fundamental Research Funds for the Central Universities(Wk2060140026).
文摘Lithium-sulfur(Li-S)batteries have attracted intensive attention owing to their ultrahigh theoretical energy density.Nevertheless,the practical application of Li-S batteries is prevented by uncontrollable shuttle effect and retarded reaction kinetics.To address the above issues,lithium fluoride(LiF)was employed to regulate the surface chemistry of routine separator.The functional separator demonstrates a great ability to suppress active S loss and protect lithium anode.This work provides a facile strategy for the development of advanced Li-S batteries.
