金属锂负极表面构建稳定SEI膜的研究进展

Progress of constructing stable SEI film on surface of lithium metal anode

以金属锂为负极材料的锂金属二次电池被认为是最具前景的下一代高比能电池。然而,由于金属锂与电解液之间自发反应生成的固态电解质界面(SEI)在电池循环过程中的稳定性较差,加剧了锂枝晶生长、库仑效率降低和容量衰减等一系列问题,从而限制了锂金属二次电池的商业应用,因此提高SEI的稳定性是锂金属二次电池领域的研究热点。总结了近年来对SEI组分与结构进行调控以改善其稳定性的研究进展,并展望了金属锂表面SEI设计与构建的研究趋势,为金属锂负极的研究提供借鉴。

Lithium metal secondary battery using metallic lithium as a negative electrode material is considered to be the most promising high energy-density battery.However,the poor stability of the solid electrolyte interface(SEI)generated by the spontaneous reaction between lithium metal and the electrolyte during battery cycling aggravates a series of problems such as the growth of lithium dendrite and low columbic efficiency,which limits the commercial applications of the lithium metal secondary battery.Therefore,improving the stability of SEI is a research focus in the field of lithium metal secondary batteries.This review summarized the recent research progress in regulating the composition and structure of SEI to improve its stability,and prospected the research trend in the design and construction of SEI on the surface of metallic lithium to provide reference for the research of lithium metal anode.