构建准局部化的高度溶解结构,以稳定电池接口在非易燃的酸盐基电解质中
Chenyang Shi1, Mengran Wang1,2,3,4, Zari Tehrani5
1School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, China.
将极性碳酸盐溶剂引入离子电池中,可以防止阻燃型三二二乙烯酸盐 (TFEP) 降解石墨阳极. 这一策略提高了电池的安全性和循环性能.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 基于酸盐的电解质提高了离子电池的安全性,但面临与石墨阳极和高压阴极的兼容性问题.
- 通常使用的化酸盐会增加界面电阻,导致性能降低.
研究的目的:
- 开发一种阻燃电解质,对石墨阳极和高压阴极具有更好的兼容性.
- 为了提高离子电池的循环稳定性和整体性能,使用基于酸盐的电解质.
主要方法:
- 加入极性碳酸盐溶剂来修改离子的溶解结构.
- 形成一个准局部化的高度溶解结构,以限制电解质的减少.
- 对LiNi0.8Mn0.1Co0.1O2 (NCM811) 的电化学测试. 带有优化电解质的石墨 (Gr) 囊细胞.
主要成果:
- 优化的电解质阻止了trifluorethyl phosphate (TFEP) 参与离子溶解外,限制了其减少.
- 使用优化电解质的Gr囊细胞在0.5C的370个循环后显示了80.1%的容量保留,明显优于对照 (47.1%在300个循环后).
- 在4.5V切断电压下运行的电池在125个循环后保持了82.8%的容量,超过了商业碳酸盐电解质 (125个循环后56.9%).
结论:
- 开发的准局部高度溶解结构有效地稳定了电极接口.
- 这一策略显著提高了基于酸盐的阻燃电解质的循环性能,使离子电池更安全,更耐用.
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