Self-healing composite solid electrolytes with enhanced Li+ transport and mechanical properties for safe lithium metal batteries

被引：0

作者：

Li, Jiajia ^{[1
,2
]}

Yang, Lipeng ^{[2
]}

Zhang, Haitao ^{[2
]}

Ji, Xiaoyan ^{[1
]}

机构：

[1] Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå,97187, Sweden

[2] Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China

来源：

Chemical Engineering Journal | 2022年 / 438卷

关键词：

Composite solid electrolytes - Cycling life - Li + - Lithium metal battery - Lithium metals - Poly(ionic liquid)s - Self healing composites - Self-healing - Transference number - Transport and mechanical properties;

D O I：

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中图分类号：

学科分类号：

摘要：

The Li dendrites introduced by the inhomogeneous Li-ion flux are the barriers to the commercialization of solid-state lithium metal batteries (LMBs). Increasing the Li+ transference number and homogenizing the Li+ flux are two effective strategies to solve the aforementioned issues. Herein, a flexible composite solid electrolyte (CSE) with an enhanced Li+ transference number, high ionic conductivity, and self-healing function was synthesized via a simple template method. Boron nitride (BN) nanosheets with high specific surface area and richly porous structure were used as the passive inorganic filler, homogenizing the Li+ flux and facilitating the Li+ transmission. The flexible and self-healing features of the CSE reduced the interface resistance and considerably prolonged their cycling life. By exploiting stress–strain curves before and after healing, along with physical characterizations, the self-healing efficiency was obtained and the dendrite suppress mechanisms at the electrode/CSE interface were discussed. Finally, the assembled LiFePO4/Li cell with optimized CSE exhibited impressive cycling performance and delivered a steady discharge capacity up to 152 mA h g−1 after 300 cycles at 0.1C. This universal strategy can be used in other emerging energy storage fields to boost high energy density and long cycling life. © 2022 The Authors

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