无形固体电解质具有高离子导电性,用于全固态高阴极的稳定循环
Feng Li1, Xiaobin Cheng2, Gongxun Lu3
1Division of Nanomaterials and Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, Anhui, China.
Journal of the American Chemical Society
|December 11, 2023
概括
新的无形化物固体电解质使高性能全固态电池具有高阴极. 这些材料在低温下也具有出色的离子导电性和稳定性.
科学领域:
- 材料科学
- 电化学
- 固态电池
背景情况:
- 固体电解质对于高性能全固态电池至关重要.
- 无形的SE具有优势,例如无粒边界结构以实现均的离子导电.
- 现有的无形氧化物和硫化物在离子导电性和电化学稳定性方面存在限制,这阻碍了它们在高阴极中使用.
研究的目的:
- 为先进的ASSLB开发新的无形固体电解质.
- 调查无形的基于Li-Ta-Cl的化物SE与高阴极的兼容性.
- 评估使用这些新SE的ASSLB的业绩和稳定性.
主要方法:
- 基于Li-Ta-Cl的无形化物固体电解质的合成和表征.
- 机器学习模拟,固态7Li核磁共振和X射线吸收分析以确定材料的结构.
- 使用无形SE和高单晶阴极的ASSLB的制造和电化学测试.
主要成果:
- 无形的Li-Ta-ClSE具有高离子导电性 (高达7.16 mS cm−1) 和低的Young模量 (约. 3 GPa) 的时间.
- SE与高阴极具有良好的兼容性,在800个周期内保持高容量.
- 在0.2°C的75个循环后,ASSLB保持了80%的容量,具有高面积容量 (5 mA h cm−2) 和在-10°C的9800个循环后的稳定运行.
结论:
- 无形的Li-Ta-ClSE对高性能ASSLB来说是有前途的.
- 这些SE可促进离子的均导电,并与刚性部件保持物理接触.
- 开发的SE为高阴极的高能量密度ASSLB铺平了道路,包括在寒冷环境中稳定运行.
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