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Updated: May 7, 2025

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2ZrF6保护层启用了硫化物全固态电池中的高压LiCoO正电极.
Xing Zhou1,2, Chia-Yu Chang3, Dongfang Yu4
1Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, China.
Nature communications
|January 3, 2025
概括
在LiCoO2上采用了一种新的Li2ZrF6涂层,通过防止与硫化物固态电解质 (SSEs) 的有害反应,实现高压全固态电池,确保长期稳定性和高容量保留.
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:
- 硫化物全固态电池中的高压正极材料受到硫化物固态电解质 (SSEs) 低氧化潜力的限制.
- 表面涂料用于减轻界面反应,但通常会与SSEs发生反应,导致降解和容量衰减.
研究的目的:
- 为高压正电极材料开发稳定的表面涂层,最大限度地减少与硫化物SSE的反应.
- 为了提高硫化物全固态电池的电化学性能和循环稳定性.
主要方法:
- 用Li2ZrF6.6涂层LiCoO2正极材料,使用Li2ZrF6.
- 使用Li6PS5Cl作为SSE制造一个全固态电池单元.
- 评估涂层电极的界面兼容性和电化学性能.
主要成果:
- 2ZrF6涂层与硫化物SSE反应最小,其分解产品无电子导体.
- 这种涂层有效地抑制了LiCoO2.2的结构转变.
- 全固态电池在高质量负载和3.9V切断电压下,在1500个循环后实现了高初始面积容量 (5.2 mAh cm-2) 和80.5%的保留率.
结论:
- 2ZrF6是硫化物全固态电池中高压正电极的有前途的保护性涂层.
- 这种方法提高了接口稳定性和长期循环性能,克服了当前电池技术的关键局限性.
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