电解质
枝晶(数学)
锂(药物)
电化学
材料科学
电池(电)
金属锂
电极
快离子导体
聚合物
化学工程
纳米技术
电化学电池
化学
复合材料
物理化学
几何学
数学
工程类
内分泌学
医学
功率(物理)
物理
量子力学
作者
Jie Liu,Ziyu Song,Fengjiao Yu,Michel Armand,Zhibin Zhou,Heng Zhang,Yuhui Chen
标识
DOI:10.1002/smtd.202401233
摘要
Abstract Solid polymer electrolytes (SPEs) have been treated as a viable solution to build high‐performance solid‐state lithium metal batteries (SSLMBs) at the industrial level, bypassing the safety and energy density dilemmas experienced by today's lithium‐ion battery technology. To promote a wider application of SPEs‐based SSLMBs, the chemical and electrochemical characteristics of lithium metal (Li°) electrode in SPEs have to be clearly elucidated. In this work, the morphological evolution of Li° electrode in the SPEs‐based SSLMBs is comprehensively investigated, via a customized electrochemical cell allowing optical microscopic analyses. The results demonstrate that differing from inorganic solid electrolytes, the elastic feature of SPEs eliminates the “memory effect” of the dendrite formation, in which the previously formed dendrites can be dissolved and the resulting space can be simultaneously occupied by electrolyte components, instead of leaving for a second‐round growth of Li° dendrites. Furthermore, the largely increased electronic conductivities of the as‐formed interphases between Li° electrode and SPEs are found to be responsible for the notoriously soft short‐circuit behavior observed during cycling. These findings bring a fresh understanding of the formation and evolution of lithium dendrites in SPE‐based cells, which are vital for improving the long‐term stability of SSLMBs and other related high‐energy battery systems.
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