Although showing huge potential in prospering the marketplace of all-solid-state lithium metal batteries(ASSLMBs),garnet-type solid electrolytes(Li6.5La3Zr1.5Ta0.6O12,LLZTO)are critically plagued by interface instabil...Although showing huge potential in prospering the marketplace of all-solid-state lithium metal batteries(ASSLMBs),garnet-type solid electrolytes(Li6.5La3Zr1.5Ta0.6O12,LLZTO)are critically plagued by interface instability with Li anode and the vulnerability to Li dendrite,which are attributed to poor Li diffusion kinetic in bulk Li metal.Herein,a LixAg solid solution alloy with high Li diffusion kinetic is reported as a mixed ionelectron conductor(MIEC)alloy anode.The high Li diffusion kinetic stemming from a low eutectic point and a high mutual solubility of LixAg could reduce the Li concentration gradient in the anode,regulate Li electrochemical potential,and change the relative local overpotential for Li stripping/plating in the anode.Notably,Li stripping/plating prefers energetically at the LixAg/current collector interface rather than the LLZTO/LixAg interface.Therefore,the contact loss is avoided at the LLZTO/LixAg interface.As a result,excellent cycling stability(~1,200 h at 0.2 mA/cm2),and dendrites tolerance(critical current density of 1.2 mA/cm2)are demonstrated by using LixAg as anode.Further research has elucidated that those alloys with low eutectic temperature and high mutual solubility with lithium should be focused on,as they would provide and maintain a soft lattice and a high lithium diffusion rate during composition change.This provides a basis for the selection of alloy phases in negative electrode materials,as well as their application in garnet-based ASSLMBs.展开更多
锂离子电池在研发和使用过程中,材料的表界面特性及其演变行为直接影响了电池的性能和应用。采用恰当的表面分析技术解析锂离子电池体系中表界面的组分、结构以及分布,有利于更好地探究界面性能优化,研究离子传输行为,以及分析电池失效...锂离子电池在研发和使用过程中,材料的表界面特性及其演变行为直接影响了电池的性能和应用。采用恰当的表面分析技术解析锂离子电池体系中表界面的组分、结构以及分布,有利于更好地探究界面性能优化,研究离子传输行为,以及分析电池失效机制。俄歇电子能谱(Auger electron spectroscopy,AES)是一种具有较高空间分辨率的电子束探针表面分析技术,可实现除H和He以外的大部分元素及其价态的定性和半定量分析,以及二维成像表征。本文介绍了俄歇电子能谱的技术原理、主要功能及分析方法,总结了其在锂离子电池研究中的应用案例及相关技巧,为AES表征技术在锂电池领域的广泛合理应用总结了经验,同时对AES技术在该领域的应用发展进行了展望。展开更多
基金supported by the Natural Science Foundation of China(Grant 51977097,52207234)the Science and Technology Project of State Grid Corporation of China(Grant No.5419-202199552A-0-5-ZN).
文摘Although showing huge potential in prospering the marketplace of all-solid-state lithium metal batteries(ASSLMBs),garnet-type solid electrolytes(Li6.5La3Zr1.5Ta0.6O12,LLZTO)are critically plagued by interface instability with Li anode and the vulnerability to Li dendrite,which are attributed to poor Li diffusion kinetic in bulk Li metal.Herein,a LixAg solid solution alloy with high Li diffusion kinetic is reported as a mixed ionelectron conductor(MIEC)alloy anode.The high Li diffusion kinetic stemming from a low eutectic point and a high mutual solubility of LixAg could reduce the Li concentration gradient in the anode,regulate Li electrochemical potential,and change the relative local overpotential for Li stripping/plating in the anode.Notably,Li stripping/plating prefers energetically at the LixAg/current collector interface rather than the LLZTO/LixAg interface.Therefore,the contact loss is avoided at the LLZTO/LixAg interface.As a result,excellent cycling stability(~1,200 h at 0.2 mA/cm2),and dendrites tolerance(critical current density of 1.2 mA/cm2)are demonstrated by using LixAg as anode.Further research has elucidated that those alloys with low eutectic temperature and high mutual solubility with lithium should be focused on,as they would provide and maintain a soft lattice and a high lithium diffusion rate during composition change.This provides a basis for the selection of alloy phases in negative electrode materials,as well as their application in garnet-based ASSLMBs.
文摘锂离子电池在研发和使用过程中,材料的表界面特性及其演变行为直接影响了电池的性能和应用。采用恰当的表面分析技术解析锂离子电池体系中表界面的组分、结构以及分布,有利于更好地探究界面性能优化,研究离子传输行为,以及分析电池失效机制。俄歇电子能谱(Auger electron spectroscopy,AES)是一种具有较高空间分辨率的电子束探针表面分析技术,可实现除H和He以外的大部分元素及其价态的定性和半定量分析,以及二维成像表征。本文介绍了俄歇电子能谱的技术原理、主要功能及分析方法,总结了其在锂离子电池研究中的应用案例及相关技巧,为AES表征技术在锂电池领域的广泛合理应用总结了经验,同时对AES技术在该领域的应用发展进行了展望。
