期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 2, 页码 2285-2292出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b16083
关键词
Li metal anode; artificial protective film; solid electrolyte interphase; high performance; EBC-LiTFSI coating
资金
- National Natural Science Foundation of China [21673033, 21473022]
- Science and Technology Department of Sichuan Province of China [2019YFH0001]
Lithium (Li) metal anode is a promising candidate for next-generation high capacity energy storage systems. Unfortunately, the uneven deposition/dissolution of Li metal hinders its wide applications. Herein, a robust and deformable polymer electrolyte film as the advanced protective layer on Li metal is developed by a simple tape-casting method, in which the polymer endows a comfortable interfacial contact as well as membrane flexibility to adapt the volume change, while the coordination between the polymer and Li salt provides fast Li+ ion diffusion channels. The modified Li metal anodes deliver a stable cycling over 1000 cycles under a high current density of 3 mA cm(-2) in the ether-based electrolyte. The enhanced cycling performance at high current densities are mainly attributed to the Li plating occurred beneath the ion-conducting protective layer, which facilitates Li+ ion uniform distribution and further suppresses Li dendrite growth. Accordingly, constructing a polymer electrolyte protective film onto the Li metal anodes is a facile and low-cost methodology to drive the Li metal anode toward practical application.
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