Affiliation:
1. Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
2. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Zhejiang Key Laboratory of Marine Materials and Protective Technologies Key Laboratory of Marine Materials and Related Technologies Chinese Academy of Sciences Ningbo 315201 P. R. China
Abstract
AbstractThe instability of Li10GeP2S12 toward moisture and that toward lithium metal are two challenges for the application in all‐solid‐state lithium batteries. In this work, Li10GeP2S12 is fluorinated to form a LiF‐coated core–shell solid electrolyte LiF@Li10GeP2S12. Density‐functional theory calculations confirm the hydrolysis mechanism of Li10GeP2S12 solid electrolyte, including H2O adsorption on Li atoms of Li10GeP2S12 and the subsequent PS43− dissociation affected by hydrogen bond. The hydrophobic LiF shell can reduce the adsorption site, thus resulting in superior moisture stability when exposing in 30% relative humidity air. Moreover, with LiF shell, Li10GeP2S12 shows one order lower electronic conductivity, which can significantly suppress lithium dendrite growth and reduce the side reaction between Li10GeP2S12 and lithium, realizing three times higher critical current density to 3 mA cm−2. The assembled LiNbO3@LiCoO2/LiF@Li10GeP2S12/Li battery exhibits an initial discharge capacity of 101.0 mAh g−1 with a capacity retention of 94.8% after 1000 cycles at 1 C.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
35 articles.
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