1. Li vacancy-induced ionic conductivity enhancement in Li4B7O12Cl for all-solid-state Li-ion battery application.
- Author
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Wang, Shaowei, Gao, Zesen, Sun, Futing, Yang, Yan, Tao, Lang, Wang, Yunluo, Yu, Zhiqian, Wu, Jianghua, Hou, Jingshan, Liu, Zhanqiang, Song, Hucheng, and Chen, Haijie
- Subjects
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SOLID state batteries , *IONIC conductivity , *LITHIUM cells , *CONDUCTIVITY of electrolytes , *SOLID electrolytes - Abstract
Safety concerns associated with lithium batteries suggest the development of solid-state batteries as a promising variant. In this work, we doped a lithium boracite (Li4B7O12Cl) with Mg2+ to modify the Li+ sites and observed significant improvement in ionic conductivity by two orders of magnitude (from 3.03 × 10−7 S cm−1 to 2.81 × 10−5 S cm−1 at room temperature). We attribute the enhanced ion conductivity to the artificially induced Li vacancies resulting from Mg doping. The as-fabricated symmetrical battery (Li‖Li3.6Mg0.2B7O12Cl‖Li) exhibited good cycling performance with a stable voltage output even after 60 hours of cycling. The battery showed a coulombic efficiency retention of ∼99.7% after the cycling test. Our work demonstrates that Li4B7O12Cl is a superior solid electrolyte for solid-state batteries and the introduction of Li vacancies can be an efficient approach to greatly improve the ionic conductivity of other electrolytes. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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