The interaction of a screw dislocation in the interphase layer with the circular inhomogeneity and matrix was dealt with . An efficient method for multiply connected regions was developed by combining the sectionally ...The interaction of a screw dislocation in the interphase layer with the circular inhomogeneity and matrix was dealt with . An efficient method for multiply connected regions was developed by combining the sectionally subholomorphic function theory, Schwatz symmetric principle and Cauchy integral technique. The Hilbert problem of the complex potentials for three material regions was reduced to a functional equation in the complex potential of the interphase layer, resulting in an explicit series solution . By using the present solution the interaction energy and force acting dislocation were evaluated and discussed.展开更多
Aqueous zinc batteries offer significant potential for large-scale energy storage,wearable devices,and medium-to low-speed transportation due to their safety,affordability,and environmental friendliness.However,the un...Aqueous zinc batteries offer significant potential for large-scale energy storage,wearable devices,and medium-to low-speed transportation due to their safety,affordability,and environmental friendliness.However,the uneven zinc deposition at the anode side caused by localized reaction activity from the passivation layer presents challenges that significantly impact the battery's stability and lifespan.In this study,we have proposed an expandable and maneuverable gel sustained-release(GSR)treatment to polish the Zn metal,which in situ converts its native passivation layer into a composite interphase layer with nanocrystal zinc phosphate and flexible polyvinyl alcohol.Such a thin and uniform interface contributes to fast and homogeneous Zn ion transport and improved anti-corrosion ability,enabling uniform zinc deposition without dendrite growth and thereby improving the battery performance with high-rate ability and long cycle life.This GSR treatment method,characterized by its simplicity,low cost,and universality,facilitates the widespread application of aqueous zinc batteries.展开更多
Polyethylene oxide(PEO)-based solid polymer electrolytes are considered as promising material for solidstate sodium metallic batteries(SSMBs).However,their poor interfacial stability with high-voltage cathode limits t...Polyethylene oxide(PEO)-based solid polymer electrolytes are considered as promising material for solidstate sodium metallic batteries(SSMBs).However,their poor interfacial stability with high-voltage cathode limits their application in high-energy–density solid-state batteries.Herein,a uniform,sulfur-containing inorganic–organic composite cathode–electrolyte interphase layer was in situ formed by the addition of sodium polyvinyl sulfonate(NaPVS).The 5 wt%NaPVS-Na_(3)V_(2)(PO_(4))_(3)(NVP)|PEOsodium hexauorophosphate(NaPF6)|Na battery shows a higher initial capacity of 111.2 mAh.g^(-1)and an ultra-high capacity retention of 90.5%after 300 cycles.The 5 wt%NaPVS-Na_(3)V_(2)(PO_(4))_(2)F_(3)(NVPF)|PEO-NaPF_(6)|Na battery with the high cutoff voltage of 4.2 V showed a specific discharge capacity of 88.9 mAh.g^(-1)at 0.5C for 100 cycles with a capacity retention of 79%,which is much better than that of the pristine-NVPF(PR-NVPF)|PEO-NaPF_(6)|Na battery(33.2%).The addition of NaPVS not only enhances the diffusion kinetics at the interface but also improves the rate performance and stability of the battery,thus bolstering its viability for high-energy applications.In situ phase tracking further elucidates that NaPVS effectively mitigates self-discharge induced by the oxidative decomposition of PEO at high temperature.This work proposes a general strategy to maintain the structural stability of the cathode–electrolyte interface in PEO-based high-performance SSMBs.展开更多
Gel polymer electrolytes(GPEs)with high flame‐retardant concentration can remarkably reduce the thermal runaway risk of lithium metal batteries(LMBs).However,higher flame‐retardant content in GPEs always leads to in...Gel polymer electrolytes(GPEs)with high flame‐retardant concentration can remarkably reduce the thermal runaway risk of lithium metal batteries(LMBs).However,higher flame‐retardant content in GPEs always leads to increased leakage of active component and severe lithium corrosion,which greatly hinders the service life of LMBs.Herein,GPEs with high‐loading triphenyl phosphate(TPP)are originally fabricated by coaxial electrospinning and stabilized by dual confinement effects,including chemisorption of polyvinylidene fluoride‐hexafluoropropylene(PVDF‐HFP),and physical encapsulation of polyacrylonitrile(PAN)/PVDF‐HFP.These effects arise from the strong polar interactions between the−CF3 group in PVDF‐HFP and P=O group in TPP,as well as the superior anti‐swelling property of PAN.To mitigate TPP‐induced corrosion during cycling,the optimized Li anode is armored with LiF‐rich solid electrolyte interphase(SEI)layer through immersing it in fluoroethylene carbonate‐containing electrolyte.As expected,the corresponding Li||Li symmetric cells deliver long‐term stable cycling behavior over 2400 h at 0.5 mA cm−2,and the LiFePO4||Li batteries hold a high‐capacity retention ratio of 81.7%after 6000 cycles at 10 C with excellent flame retardancy.These findings offer new insight into designing the SEI layer for lithium metal in flame‐retardant electrolytes,thus promoting the development and application of high‐security LMBs.展开更多
High Li^(+)transference number electrolytes have long been understood to provide attractive candidates for realizing uniform deposition of Li^(+).However,such electrolytes with immobilized anions would result in incom...High Li^(+)transference number electrolytes have long been understood to provide attractive candidates for realizing uniform deposition of Li^(+).However,such electrolytes with immobilized anions would result in incomplete solid electrolyte interphase(SEI)formation on the Li anode because it suffers from the absence of appropriate inorganic components entirely derived from anions decomposition.Herein,a boron-rich hexagonal polymer structured all-solid-state polymer electrolyte(BSPE+10%LiBOB)with regulated intermolecular interaction is proposed to trade off a high Li^(+)transference number against stable SEI properties.The Li^(+)transference number of the as-prepared electrolyte is increased from 0.23 to 0.83 owing to the boron-rich cross-linker(BC)addition.More intriguingly,for the first time,the experiments combined with theoretical calculation results reveal that BOB^(-)anions have stronger interaction with B atoms in polymer chain than TFSI^(-),which significantly induce the TFSI^(-)decomposition and consequently increase the amount of LiF and Li3N in the SEI layer.Eventually,a LiFePO_(4)|BSPE+10%LiBOBlLi cell retains 96.7%after 400 cycles while the cell without BC-resisted electrolyte only retains 40.8%.BSPE+10%LiBOB also facilitates stable electrochemical cycling of solid-state Li-S cells.This study blazes a new trail in controlling the Li^(+)transport ability and SEI properties,synergistically.展开更多
Composite solid electrolytes(CSEs)have emerged as promising candidates for safe and high-energy–density solid-state lithium metal batteries(SSLMBs).However,concurrently achieving exceptional ionic conductivity and in...Composite solid electrolytes(CSEs)have emerged as promising candidates for safe and high-energy–density solid-state lithium metal batteries(SSLMBs).However,concurrently achieving exceptional ionic conductivity and interface compatibility between the electrolyte and electrode presents a significant challenge in the development of high-performance CSEs for SSLMBs.To overcome these challenges,we present a method involving the in-situ polymerization of a monomer within a self-supported porous Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZT)to produce the CSE.The synergy of the continuous conductive LLZT network,well-organized polymer,and their interface can enhance the ionic conductivity of the CSE at room temperature.Furthermore,the in-situ polymerization process can also con-struct the integration and compatibility of the solid electrolyte–solid electrode interface.The synthesized CSE exhibited a high ionic conductivity of 1.117 mS cm^(-1),a significant lithium transference number of 0.627,and exhibited electrochemical stability up to 5.06 V vs.Li/Li+at 30℃.Moreover,the Li|CSE|LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cell delivered a discharge capacity of 105.1 mAh g^(-1) after 400 cycles at 0.5 C and 30℃,corresponding to a capacity retention of 61%.This methodology could be extended to a variety of ceramic,polymer electrolytes,or battery systems,thereby offering a viable strategy to improve the electrochemical properties of CSEs for high-energy–density SSLMBs.展开更多
The problem of the elastic interaction between a screw dislocation and a three-phase circular inclusion with interracial rigid lines （anti-cracks） is investigated. An efficient and concise method for the complex mul...The problem of the elastic interaction between a screw dislocation and a three-phase circular inclusion with interracial rigid lines （anti-cracks） is investigated. An efficient and concise method for the complex multiply connected region is developed, with which explicit series form solutions of the complex potentials in the matrix, and the interphase layer and inclusion regions are derived. Based on the complex potentials, the image force on the screw dislocation is then calculated by using the Peach-Koehler formula. The equilibrium position of the dislocation is discussed in detail for various rigid line geometries, interphase layer thicknesses and material property combinations. The main results show that the interracial rigid lines exert a significant perturbation effect on the motion of the screw dislocation near the circular inclusion surrounded by an interphase layer.展开更多
Lithium(Li)metal has been considered as one of the most promising anodes for high-energy-density batteries.However,the hyperactivity of metallic Li and its dendrite growth are the major hurdles to its practical applic...Lithium(Li)metal has been considered as one of the most promising anodes for high-energy-density batteries.However,the hyperactivity of metallic Li and its dendrite growth are the major hurdles to its practical applications.Herein,a multi-functional solid-interphase-protective layer with excellent waterproof performance and fast self-healing properties was modified on the surface of Li metal to address the above issues.Under the protection of this interface,the metallic Li(denoted as P-Li)exhibited superior electrochemical stability in both Li/Li symmetric cells and full cells.Notably,even after being exposed to humid air for 3 h,the LiFePO_(4)||Li full battery with P-Li anodes still showed long-term stability with a transcendental capacity retention of~100% after 100 cycles,revealing a significant advantage to the non-working LiFePO_(4)||Li battery with air-exposed bare Li anodes.展开更多
Because of their high safety, low cost, and high volumetric specific capacity, zinc-ion batteries(ZIBs) are considered promising next-generation energy storage devices, especially given their high potential for large-...Because of their high safety, low cost, and high volumetric specific capacity, zinc-ion batteries(ZIBs) are considered promising next-generation energy storage devices, especially given their high potential for large-scale energy storage. Despite these advantages, many problems remain for ZIBs—such as Zn dendrite growth, hydrogen evolution, and Zn anode corrosion—which significantly reduce the coulomb efficiency and reversibility of the battery and limit its cycle lifespan, resulting in much uncertainty in terms of its practical applications. Numerous electrolyte additives have been proposed in recent years to solve the aforementioned problems.This review focuses on electrolyte additives and discusses the different substances employed as additives to overcome the problems by altering the Zn~(2+)solvation structure, creating a protective layer at the anode–electrolyte interface, and modulating the Zn~(2+)distribution to be even and Zn deposition to be uniform. On the basis of the review, the possible research strategies, future directions of electrolyte additive development, and the existing problems to be solved are also described.展开更多
The Li-and Mn-rich layered oxides(R-LNCM)are considered as promising cathode materials for high-energy density lithium-ion batteries(LIBs).However,the interface side reaction aggravates the voltage and capacity fading...The Li-and Mn-rich layered oxides(R-LNCM)are considered as promising cathode materials for high-energy density lithium-ion batteries(LIBs).However,the interface side reaction aggravates the voltage and capacity fading between cathode material and electrolyte at high voltage,which severely hinders the practical application of LIB s.Herein,lithium polyacrylate(LiPAA)as the binder and coating agent is applied to suppress the voltage and capacity fading of R-LNCM electrode.The flexible LiPAA layers with high elasticity are capable of impeding cathode cracks on the particle surface via mechanical stress relief.Thus,superior voltage and capacity fading suppression on R-LNCM electrode is finally achieved.As a result,LiPAA-R-LNCM cathode exhibits a remarkable specific capacity of 186 mA·h·g^(-1)with~73%retention at 1℃after 200cycles.Further,the corresponding average discharge potential is maintained to~3.1 V with only~0.4 V falling.展开更多
Electrolytes play a key role in determining the electrochemical performance,safety,and lifespan of potassium-based batteries,making their selection and optimization a critical area of research.This study systematicall...Electrolytes play a key role in determining the electrochemical performance,safety,and lifespan of potassium-based batteries,making their selection and optimization a critical area of research.This study systematically investigates the effects of two major potassium-based battery electrolytes,potassium hexafluorophosphate(KPF_(6))and potassium difluorosulfonimide(KFSI)in ethylene carbonate/diethyl carbonate(EC/DEC)solvents,on battery performance,solid electrolyte interphase(SEI)stability,aluminum(Al)current collector corrosion behavior,electrochemical stability window,and dendrite growth issue.Experimental results reveal that KFSI electrolyte significantly outperforms KPF_(6)in terms of cycling stability,rate capability,and Coulombic efficiency(CE),primarily due to the formation of a high-quality SEI on electrode surface.Through X-ray photoelectron spectroscopy(XPS)and time-of-flight secondary ion mass spectrometry(TOF-SIMS)analyses,we construct the SEI structure for both electrolytes,and find that the SEI formed by KFSI is more uniform and stable.Additionally,KPF_(6)exhibits weaker corrosivity towards the Al current collector compared to KFSI due to the formation of an AlF_(3) layer with higher oxidation stability on Al surface.Furthermore,in-situ optical microscopy observations indicate that the dendrite growth in KFSI electrolyte is more uniform,preventing the aggregates.These findings provide essential experimental evidence and theoretical support for optimizing the electrolyte in potassium-based batteries.展开更多
Rechargeable aqueous metal-ion batteries are promising alternative energy storage devices in the postlithium-ion era due to their inherent safety and environmental compatibility.Among them,aqueous zinc ion batteries(A...Rechargeable aqueous metal-ion batteries are promising alternative energy storage devices in the postlithium-ion era due to their inherent safety and environmental compatibility.Among them,aqueous zinc ion batteries(AZIBs)stand out as next-generation energy storage systems,offering low cost,high safety,and eco-friendliness.Nevertheless,the instability of Zn metal anodes,manifested as Zn dendrite growth,interfacial side reactions,and hydrogen(H_(2))evolution,remains a major obstacle to commercialization.To address these challenges,extensive research has been conducted to understand and mitigate these issues.This review comprehensively summarizes recent advances in Zn anode stabilization strategies,including artificial solid electrolyte interphase(SEI)layers,structural optimization,electrolyte modification,and bioinspired designs.These approaches collectively aim to achieve uniform Zn deposition,suppress parasitic reactions,and enhance cycling stability.Furthermore,it critically evaluates the advantages and feasibility of different strategies,discuss potential synergistic effects of multi-strategy integration,and provide perspectives for future research directions.展开更多
基金Foundation items: the National Natural Science Foundation of China (10272009) the Science Foundation of Aviation of China (99G51022)
文摘The interaction of a screw dislocation in the interphase layer with the circular inhomogeneity and matrix was dealt with . An efficient method for multiply connected regions was developed by combining the sectionally subholomorphic function theory, Schwatz symmetric principle and Cauchy integral technique. The Hilbert problem of the complex potentials for three material regions was reduced to a functional equation in the complex potential of the interphase layer, resulting in an explicit series solution . By using the present solution the interaction energy and force acting dislocation were evaluated and discussed.
基金supported by the National Key R&D Program of China(Grant 2022YFB2402200)National Natural Science Foundation of China(Grant 92372206,52271140,52171194)+2 种基金Jilin Province Science and Technology Development Plan Funding Project(Grant YDZJ202301-ZYTS545)National Natural Science Foundation of China Excellent Young Scientists(Overseas)Youth Innovation Promotion Association CAS(Grant 2020230)。
文摘Aqueous zinc batteries offer significant potential for large-scale energy storage,wearable devices,and medium-to low-speed transportation due to their safety,affordability,and environmental friendliness.However,the uneven zinc deposition at the anode side caused by localized reaction activity from the passivation layer presents challenges that significantly impact the battery's stability and lifespan.In this study,we have proposed an expandable and maneuverable gel sustained-release(GSR)treatment to polish the Zn metal,which in situ converts its native passivation layer into a composite interphase layer with nanocrystal zinc phosphate and flexible polyvinyl alcohol.Such a thin and uniform interface contributes to fast and homogeneous Zn ion transport and improved anti-corrosion ability,enabling uniform zinc deposition without dendrite growth and thereby improving the battery performance with high-rate ability and long cycle life.This GSR treatment method,characterized by its simplicity,low cost,and universality,facilitates the widespread application of aqueous zinc batteries.
基金supported by the Natural Science Foundation of China(No.22109079)the Natural Science Foundation of China(No.21973008)+2 种基金the Natural Science Foundation of China(No.22179010)the National Key R&D Program of China(No.2021YFB2400200)Taishan Scholars of Shandong Province(No.tsqnz20231212)。
文摘Polyethylene oxide(PEO)-based solid polymer electrolytes are considered as promising material for solidstate sodium metallic batteries(SSMBs).However,their poor interfacial stability with high-voltage cathode limits their application in high-energy–density solid-state batteries.Herein,a uniform,sulfur-containing inorganic–organic composite cathode–electrolyte interphase layer was in situ formed by the addition of sodium polyvinyl sulfonate(NaPVS).The 5 wt%NaPVS-Na_(3)V_(2)(PO_(4))_(3)(NVP)|PEOsodium hexauorophosphate(NaPF6)|Na battery shows a higher initial capacity of 111.2 mAh.g^(-1)and an ultra-high capacity retention of 90.5%after 300 cycles.The 5 wt%NaPVS-Na_(3)V_(2)(PO_(4))_(2)F_(3)(NVPF)|PEO-NaPF_(6)|Na battery with the high cutoff voltage of 4.2 V showed a specific discharge capacity of 88.9 mAh.g^(-1)at 0.5C for 100 cycles with a capacity retention of 79%,which is much better than that of the pristine-NVPF(PR-NVPF)|PEO-NaPF_(6)|Na battery(33.2%).The addition of NaPVS not only enhances the diffusion kinetics at the interface but also improves the rate performance and stability of the battery,thus bolstering its viability for high-energy applications.In situ phase tracking further elucidates that NaPVS effectively mitigates self-discharge induced by the oxidative decomposition of PEO at high temperature.This work proposes a general strategy to maintain the structural stability of the cathode–electrolyte interface in PEO-based high-performance SSMBs.
基金supported by the National Natural Science Foundation of China (52404316, 52474325)the S&T program of Hebei Province(225A4404D)+3 种基金the Natural Science Foundation of Hainan Province (524RC475)the Collaborative Innovation Center of Marine Science and Technology of Hainan University (XTCX2022HYC14)the Xingtai City Natural Science Foundation (2023ZZ027)The Pico Electron Microscopy Center of Hainan University partially supported this study
文摘Gel polymer electrolytes(GPEs)with high flame‐retardant concentration can remarkably reduce the thermal runaway risk of lithium metal batteries(LMBs).However,higher flame‐retardant content in GPEs always leads to increased leakage of active component and severe lithium corrosion,which greatly hinders the service life of LMBs.Herein,GPEs with high‐loading triphenyl phosphate(TPP)are originally fabricated by coaxial electrospinning and stabilized by dual confinement effects,including chemisorption of polyvinylidene fluoride‐hexafluoropropylene(PVDF‐HFP),and physical encapsulation of polyacrylonitrile(PAN)/PVDF‐HFP.These effects arise from the strong polar interactions between the−CF3 group in PVDF‐HFP and P=O group in TPP,as well as the superior anti‐swelling property of PAN.To mitigate TPP‐induced corrosion during cycling,the optimized Li anode is armored with LiF‐rich solid electrolyte interphase(SEI)layer through immersing it in fluoroethylene carbonate‐containing electrolyte.As expected,the corresponding Li||Li symmetric cells deliver long‐term stable cycling behavior over 2400 h at 0.5 mA cm−2,and the LiFePO4||Li batteries hold a high‐capacity retention ratio of 81.7%after 6000 cycles at 10 C with excellent flame retardancy.These findings offer new insight into designing the SEI layer for lithium metal in flame‐retardant electrolytes,thus promoting the development and application of high‐security LMBs.
基金supported by the National Natural Science Foundation of China(Nos.21905041,22279014)Jilin Province Major Science and Technology special project(Nos.20220301004GX+4 种基金20220301005GX)R&D Program of Power Batteries with Low Temperature and High Energy,Science and Technology Bureau of Changchun(No.19SS013)Key Subject Construction of Physical Chemistry of Northeast Normal UniversitySpecial foundation of Jilin Province Industrial Technology Research and Development(No.2019C042)the Fundamental Research Funds for the Central Universities(No.2412020FZ008)
文摘High Li^(+)transference number electrolytes have long been understood to provide attractive candidates for realizing uniform deposition of Li^(+).However,such electrolytes with immobilized anions would result in incomplete solid electrolyte interphase(SEI)formation on the Li anode because it suffers from the absence of appropriate inorganic components entirely derived from anions decomposition.Herein,a boron-rich hexagonal polymer structured all-solid-state polymer electrolyte(BSPE+10%LiBOB)with regulated intermolecular interaction is proposed to trade off a high Li^(+)transference number against stable SEI properties.The Li^(+)transference number of the as-prepared electrolyte is increased from 0.23 to 0.83 owing to the boron-rich cross-linker(BC)addition.More intriguingly,for the first time,the experiments combined with theoretical calculation results reveal that BOB^(-)anions have stronger interaction with B atoms in polymer chain than TFSI^(-),which significantly induce the TFSI^(-)decomposition and consequently increase the amount of LiF and Li3N in the SEI layer.Eventually,a LiFePO_(4)|BSPE+10%LiBOBlLi cell retains 96.7%after 400 cycles while the cell without BC-resisted electrolyte only retains 40.8%.BSPE+10%LiBOB also facilitates stable electrochemical cycling of solid-state Li-S cells.This study blazes a new trail in controlling the Li^(+)transport ability and SEI properties,synergistically.
基金supported by the National Research Foundation of Korea (NRF) grant funded by the MSIT,Korea (No. 2018R1A5A1025224 and No. 2019R1A2C1084020)this research received funding support from a grant from the Korea Planning&Evaluation Institute of Industrial Technology (KEIT),funded by the MOTIE of Korea (No. 10077287)。
文摘Composite solid electrolytes(CSEs)have emerged as promising candidates for safe and high-energy–density solid-state lithium metal batteries(SSLMBs).However,concurrently achieving exceptional ionic conductivity and interface compatibility between the electrolyte and electrode presents a significant challenge in the development of high-performance CSEs for SSLMBs.To overcome these challenges,we present a method involving the in-situ polymerization of a monomer within a self-supported porous Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZT)to produce the CSE.The synergy of the continuous conductive LLZT network,well-organized polymer,and their interface can enhance the ionic conductivity of the CSE at room temperature.Furthermore,the in-situ polymerization process can also con-struct the integration and compatibility of the solid electrolyte–solid electrode interface.The synthesized CSE exhibited a high ionic conductivity of 1.117 mS cm^(-1),a significant lithium transference number of 0.627,and exhibited electrochemical stability up to 5.06 V vs.Li/Li+at 30℃.Moreover,the Li|CSE|LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cell delivered a discharge capacity of 105.1 mAh g^(-1) after 400 cycles at 0.5 C and 30℃,corresponding to a capacity retention of 61%.This methodology could be extended to a variety of ceramic,polymer electrolytes,or battery systems,thereby offering a viable strategy to improve the electrochemical properties of CSEs for high-energy–density SSLMBs.
基金Project supported by the National Natural Science Foundation of China (No.10472030).
文摘The problem of the elastic interaction between a screw dislocation and a three-phase circular inclusion with interracial rigid lines （anti-cracks） is investigated. An efficient and concise method for the complex multiply connected region is developed, with which explicit series form solutions of the complex potentials in the matrix, and the interphase layer and inclusion regions are derived. Based on the complex potentials, the image force on the screw dislocation is then calculated by using the Peach-Koehler formula. The equilibrium position of the dislocation is discussed in detail for various rigid line geometries, interphase layer thicknesses and material property combinations. The main results show that the interracial rigid lines exert a significant perturbation effect on the motion of the screw dislocation near the circular inclusion surrounded by an interphase layer.
基金supported by the National Natural Science Foundation of China(21975063)the Natural Science Foundation of Hebei Province(B2020205019,B2021205019,B2019205249 and B2021205029)the School Fund of Hebei Normal University(L2017B03)。
文摘Lithium(Li)metal has been considered as one of the most promising anodes for high-energy-density batteries.However,the hyperactivity of metallic Li and its dendrite growth are the major hurdles to its practical applications.Herein,a multi-functional solid-interphase-protective layer with excellent waterproof performance and fast self-healing properties was modified on the surface of Li metal to address the above issues.Under the protection of this interface,the metallic Li(denoted as P-Li)exhibited superior electrochemical stability in both Li/Li symmetric cells and full cells.Notably,even after being exposed to humid air for 3 h,the LiFePO_(4)||Li full battery with P-Li anodes still showed long-term stability with a transcendental capacity retention of~100% after 100 cycles,revealing a significant advantage to the non-working LiFePO_(4)||Li battery with air-exposed bare Li anodes.
文摘Because of their high safety, low cost, and high volumetric specific capacity, zinc-ion batteries(ZIBs) are considered promising next-generation energy storage devices, especially given their high potential for large-scale energy storage. Despite these advantages, many problems remain for ZIBs—such as Zn dendrite growth, hydrogen evolution, and Zn anode corrosion—which significantly reduce the coulomb efficiency and reversibility of the battery and limit its cycle lifespan, resulting in much uncertainty in terms of its practical applications. Numerous electrolyte additives have been proposed in recent years to solve the aforementioned problems.This review focuses on electrolyte additives and discusses the different substances employed as additives to overcome the problems by altering the Zn~(2+)solvation structure, creating a protective layer at the anode–electrolyte interface, and modulating the Zn~(2+)distribution to be even and Zn deposition to be uniform. On the basis of the review, the possible research strategies, future directions of electrolyte additive development, and the existing problems to be solved are also described.
基金financial support from the National Key Research and Development Program of China (Grant No.2021YFB2400401)Project of Development Fund of Key Laboratory of Green Plateau and Ecological Community of Qinghai Province (Grant No.SL-2020-019)。
文摘The Li-and Mn-rich layered oxides(R-LNCM)are considered as promising cathode materials for high-energy density lithium-ion batteries(LIBs).However,the interface side reaction aggravates the voltage and capacity fading between cathode material and electrolyte at high voltage,which severely hinders the practical application of LIB s.Herein,lithium polyacrylate(LiPAA)as the binder and coating agent is applied to suppress the voltage and capacity fading of R-LNCM electrode.The flexible LiPAA layers with high elasticity are capable of impeding cathode cracks on the particle surface via mechanical stress relief.Thus,superior voltage and capacity fading suppression on R-LNCM electrode is finally achieved.As a result,LiPAA-R-LNCM cathode exhibits a remarkable specific capacity of 186 mA·h·g^(-1)with~73%retention at 1℃after 200cycles.Further,the corresponding average discharge potential is maintained to~3.1 V with only~0.4 V falling.
基金supported by the Innovation Capability Support Program of Shaanxi(No.2024CX-GXPT-12)the National Natural Science Foundation of China(No.22403074).
文摘Electrolytes play a key role in determining the electrochemical performance,safety,and lifespan of potassium-based batteries,making their selection and optimization a critical area of research.This study systematically investigates the effects of two major potassium-based battery electrolytes,potassium hexafluorophosphate(KPF_(6))and potassium difluorosulfonimide(KFSI)in ethylene carbonate/diethyl carbonate(EC/DEC)solvents,on battery performance,solid electrolyte interphase(SEI)stability,aluminum(Al)current collector corrosion behavior,electrochemical stability window,and dendrite growth issue.Experimental results reveal that KFSI electrolyte significantly outperforms KPF_(6)in terms of cycling stability,rate capability,and Coulombic efficiency(CE),primarily due to the formation of a high-quality SEI on electrode surface.Through X-ray photoelectron spectroscopy(XPS)and time-of-flight secondary ion mass spectrometry(TOF-SIMS)analyses,we construct the SEI structure for both electrolytes,and find that the SEI formed by KFSI is more uniform and stable.Additionally,KPF_(6)exhibits weaker corrosivity towards the Al current collector compared to KFSI due to the formation of an AlF_(3) layer with higher oxidation stability on Al surface.Furthermore,in-situ optical microscopy observations indicate that the dendrite growth in KFSI electrolyte is more uniform,preventing the aggregates.These findings provide essential experimental evidence and theoretical support for optimizing the electrolyte in potassium-based batteries.
基金supported by the National Natural Science Foundation of China(Grant No.22208117)the Tianjin University of Science and Technology Municipal College Students’Innovation and Entrepreneurship Training Program(Grant No.202410057022)the Fellowship of China Postdoctoral Science Foundation(Grant No.2023M741818).
文摘Rechargeable aqueous metal-ion batteries are promising alternative energy storage devices in the postlithium-ion era due to their inherent safety and environmental compatibility.Among them,aqueous zinc ion batteries(AZIBs)stand out as next-generation energy storage systems,offering low cost,high safety,and eco-friendliness.Nevertheless,the instability of Zn metal anodes,manifested as Zn dendrite growth,interfacial side reactions,and hydrogen(H_(2))evolution,remains a major obstacle to commercialization.To address these challenges,extensive research has been conducted to understand and mitigate these issues.This review comprehensively summarizes recent advances in Zn anode stabilization strategies,including artificial solid electrolyte interphase(SEI)layers,structural optimization,electrolyte modification,and bioinspired designs.These approaches collectively aim to achieve uniform Zn deposition,suppress parasitic reactions,and enhance cycling stability.Furthermore,it critically evaluates the advantages and feasibility of different strategies,discuss potential synergistic effects of multi-strategy integration,and provide perspectives for future research directions.
