石榴型固态电解质,具有针对性兼容性,用于高性能全固态电池
Yang Zhang1, Shuhan Wang1, Kai Wan2
1College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|December 10, 2025
概括
这项研究开发了新的石榴石固态电解质 (LLZSOF),具有改进的金属兼容性. 这些电解质在全固态电池中表现出色,为可扩展的应用铺平了道路.
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
- 固态化学 固态化学
背景情况:
- 石榴石型Li7La3Zr2O12 (LLZO) 固态电解质 (SSEs) 为所有固态电池提供高离子导电性.
- 在实际的电池部署中,LLZO和金属电极之间的界面兼容性仍然是一个挑战.
研究的目的:
- 设计和合成具有增强金属兼容性的新型石榴石型SSE (Li7La3Zr2-xScxO12-xFx,LLZSOF).
- 调查和兴奋剂对LLZO结构,电化学和界面特性的影响.
主要方法:
- 合成具有不同Sc和F含量的LLZSOF材料 (x = 0-0.20).
- 结晶结构,离子导电性和电化学稳定性的表征.
- 对称电池和全固态金属电池 (ASLMB) 的制造和测试.
主要成果:
- 优化的LLZSOF-0.15组合表现出与金属的强烈接口接触,抑制了Li+/H+交换.
- 替代扫增加了含量,并改善了还原稳定性.
- 基于LLZSOF-0.15的对称电池实现了1.9 mA cm-2.2的临界电流密度.
- 使用LLZSOF-0.15的ASLMB表现出极好的循环性,对LiFePO4和NCM阴极保持高容量.
- 在120个循环中,囊细胞表现出高的库伦比克效率 (>99.5%) 和容量保留 (>94.9%).
结论:
- 开发的LLZSOF SSE具有与金属电极的卓越界面兼容性.
- 这种材料设计方法促进了用于可扩展全固态电池应用的先进石榴SSE的开发.
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