The carrier transition from Li atoms to Li vacancies in solid-state lithium alloy anodes

作者：Yang Lu, Chen‐Zi Zhao, Rui Zhang, Hong Yuan, Li‐Peng Hou, Zhongheng Fu, Xiang Chen, Jia‐Qi Huang, Qiang Zhang · 发表于：Science Advances · 年份：2021 · DOI：10.1126/sciadv.abi5520 · 被引用次数：374 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

The stable cycling of energy-dense solid-state batteries is highly relied on the kinetically stable solid-state Li alloying reactions. The Li metal precipitation at solid-solid interfaces is the primary cause of interface fluctuations and battery failures, whose formation requires a clear mechanism interpretation, especially on the key kinetic short board. Here, we introduce the lithium alloy anode as a model system to quantify the Li kinetic evolution and transition from the alloying reaction to the metal deposition in solid-state batteries, identifying that there is a carrier transition from Li atoms to Li vacancies during lithiation processes. The rate-determining step is charge transfer or Li atom diffusion at different lithiation stages.