半固态锂金属电池的微纳结构与界面设计相关基础研究

Basic Research on Micro-Nano Structure and Interface Design of Quasi-Solid-State Lithium Metal Batteries

固态锂金属电池由于其高能量密度和固态电解质的高安全性,为下一代可充电能源存储提供了有前途的解决方案。然而,锂负极与固态电解质界面相容性差,导致锂金属枝晶状沉积和电化学-化学-机械不稳定。为了解决上述问题,国家重点研发计划项目"半固态锂金属电池的微纳结构与界面设计相关基础研究"提出在原子水平上解析固态电解质及界面结构,并理解界面反应规律。同时,在实际应用体系中,通过微纳结构与界面协同优化复合电极及系统设计,构建高性能、高安全半固态锂金属电池体系。本文简要介绍了在重点研发计划的支持下,项目研究团队近两年来在三维锂金属负极电极结构设计、固态电解质界面精细调控及固态电解质原子级表征方面取得的研究进展。

All solid-state lithium metal batteries provide a promising solution for next-generation rechargeable energy storage due to their high energy density and the high safety of solid-state electrolytes.However,the interface compatibility between the lithium anode and the electrolyte is poor,leading to dendritic lithium deposition and electrochemomechanical instability.In order to tackle these challenges,the National Key Research and Development Program"Basic Research on Micro-Nano Structure and Interface Design of Quasi-Solid-State Lithium Metal Batteries"proposed to analyze the structure of solid-state electrolyte and interphase at the atomic level,and understand the interface reaction rules.At the same time,for actual application systems,the micro-nano structure and interface are used to optimize the composite electrodes to build high-performance,high-security quasi-solid-state lithium metal batteries.In this summary,briefly discussed is the key research progress made by our research team in the past two years in the structural design of three-dimensional lithium metal anodes,fine-tuning of solid electrolyte interphase,and atomic-level characterization of solid-state electrolytes.