单酸具有独特的P-F键,用于非易燃和长寿命的离子电池
Yuankun Wang1, Yintong Zhao1, Shu Zhang1
1Frontiers Science Center for New Organic Matter, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory of Advanced Chemical Power Sources, College of Chemistry, Nankai University, Tianjin, 300071, China.
Angewandte Chemie (International ed. in English)
|October 9, 2024
概括
一种新的单化辅溶剂,二甲基化酸盐 (DEFP),提高了离子电池的安全性和性能. DEFP能够形成强大的固体电解质相间形成,提高循环性和速率容量,从而实现更安全,更高性能的电池.
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
- 电池技术 电池技术
背景情况:
- 使用碳酸盐电解质的传统离子电池 (LIB) 面临安全挑战.
- 基于酸盐的电解质具有阻燃性,但由于固体电解质介相 (SEI) 形成不足,与石墨阳极的兼容性不佳.
研究的目的:
- 开发一种新的电解质添加剂,以平衡酸盐的安全性与高性能LIB所需的石墨相容性.
- 研究在单化辅溶剂中独特的P-F键的作用,以改善SEI形成和热稳定性.
主要方法:
- 合成和表征二甲基化 (DEFP) 作为辅溶剂.
- 基于DEFP的电解质在LiNi_{0.8}$Co$_{0.1}$Mn$_{0.1}$O$_{2}$的电化学测试,使它们成为完整的石墨细胞.
- 对SEI特性和热稳定性的分析.
主要成果:
- DEFP促进了在石墨阳极上形成一个强大的,富含无机物质的SEI.
- 与传统的电解质相比,基于DEFP的电解质表现出更好的循环性和速度能力.
- 使用DEFP电解质的囊细胞在低电解质/阴极比率下,在200个循环后保持94.2%的容量.
结论:
- 甲基化酸盐 (DEFP) 有效地将酸盐的安全益处与其与石墨阳极不相容分开.
- 在DEFP中独特的P-F债券是实现LIBs安全性和电化学性能提高的关键.
- 这项工作为开发下一代更安全,高性能离子电池提出了一个有前途的战略.
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