通过在石榴石固体电解质上进行表面化构建的兼容接口,用于长周期全固态金属电池
Xiaoming Zhou1, Zejian Ouyang1, Jin Liu1
1School of Metallurgy and Environment, National Energy Metal Resources and New Materials Key Laboratory, Hunan Provincial Key Laboratory of Nonferrous Value-added Metallurgy, Central South University, Changsha, 410083, China.
Small (Weinheim an der Bergstrasse, Germany)
|February 6, 2025
概括
使用酸的新表面改造有效地防止了所有固态金属电池的复合固体电解质的降解. 这提高了离子导电性和电池稳定性,为更安全,更高能量的电池铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 使用PVDF-HFP和LLZTO的复合固体电解质 (CSEs) 对高能全固态金属电池 (ASSB) 是有前途的.
- 一个关键的挑战是LLZTO上的Li2CO3被动化层,它阻碍Li+运输并降解PVDF-HFP.
- 这一层阻碍了在接口上的离子运输,并导致聚合物结合物的脱化.
研究的目的:
- 开发一种方法来稳定LLZTO表面,并提高CSEs的界面兼容性.
- 为了提高 PVDF-HFP/LLZTO 基于 ASSB 的复合固体电解质的性能和空气稳定性.
主要方法:
- 使用酸,LLZTO的表面化,形成一个LiInO2 (LIO) 层.
- 修改后的LLZTO (LIO-LLZTO) 和由此产生的CSE (LIO-CSE) 的表征.
- 电化学测试Li的电池LIO-CSE的电池Li和Li的电池Li的电池LiFePO4.
主要成果:
- 4纳米的LIO层有效地转化了Li2CO3,防止了PVDF-HFP脱,并提高了空气稳定性.
- LIO-CSE表现出增强的离子导电性 (3.1 × 10^-4 S cm^-1) 和 Li+ 转移数 (0.673).
- 酸LIO-CSE 酸Li 细胞表现为 3100 h 的稳定性,而 Li/LIO-CSE/LiFePO4 细胞在 1000 个循环后保持 81.8% 的容量.
结论:
- 用酸辅助的印化提供了一个强大的策略来稳定CSEs中的LLZTO表面.
- 修改后的CSE (LIO-CSE) 显示了更好的界面兼容性,离子导电性和电化学性能.
- 这种方法为开发高性能和稳定的全固态金属电池提供了有希望的途径.
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