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Directly Using Li2CO3 As a Lithiophobic Interlayer to Inhibit Li Dendrites for High-Performance Solid-State Batteries

ACS Energy Letters(2023)

Univ Chinese Acad Sci

Cited 14|Views11
Abstract
Garnet solid electrolytes have attracted great interestdue totheir wide electrochemistry window and high ion conductivity. However,the lithiophobic Li2CO3 generated on the garnetsurface results in a huge interfacial resistance and interface incompatibility.Herein, different from the extensive removal or conversion strategies,the Li2CO3 on the surface of Li6.5La3Zr1.5Ta0.5O12 (LLZTO)is directly used as a lithiophobic layer to suppress Li dendrite growth,and the lithophilic Li-In-F composite is used as the anode. The Lisymmetrical half-cell with a Li2CO3 interlayeris stably cycled for 6500 h without Li dendrite formation, a muchlonger time than for the half-cell without a Li2CO3 interlayer (2334 h), showing a much higher interfacial stability.Moreover, the full cell based on LiFePO4 and LiNi0.8Co0.1Mn0.1O2 cathode shows a stablecycling performance and high rate capability (LiNi0.8Co0.1Mn0.1O2, 94%@100th cycle@1C; LiFePO4, 90%@500th cycle@2C). This study provides a distinct wayof converting disadvantages into advantages and solving the Li|LLZTOinterfacial issues.
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