一种高度稳定且不易燃的深度性电解质,用于高性能金属电池
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P.R. China.
Angewandte Chemie (International ed. in English)
|July 26, 2024
概括
一种新的基于二甲基 (DMMN) 的深电解质 (DEE) 提高了金属电池的性能. 这种基于DMMN的DEE为下一代电池提供了更好的电极接口兼容性,稳定性和不易燃性.
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:
- 深电解质 (DEEs) 对金属电池 (LMB) 显示出希望,但在电极接口兼容性方面面临挑战.
- 现有的液体和固体电解质在促进LMB性能和安全方面存在局限性.
研究的目的:
- 开发一种新的基于固体二甲基甲 (DMMN) 的DEE,用于改善LMBs.
- 为了解决使用DEE的LMB中的电极接口兼容性问题.
主要方法:
- 通过将N与LiTFSI协调以促进LiTFSI解离,合成了一种新的基于DMMN的DEE.
- 研究了DMMN,Li+和TFSI-之间的相互作用,以形成DEE.
- 评估了基于DMMN的DEE的电化学稳定性和接口特性.
主要成果:
- 该DMMN分子通过N协调和结合有效地解离LiTFSI.
- 由于缺乏活性α-,DMMN与金属具有增强的还原稳定性,确保了有利的界面兼容性.
- 基于这种DEE的聚合物电解质表现出高离子导电率 (0.67 mS cm-1在25°C),高氧化电压 (5.0 V与Li+/Li相比) 和不易燃性.
- 使用这种DEE聚合物电解质的Li‖LFP和Li‖NCM811全电池显示出出色的长期循环稳定性和高速率性能.
结论:
- 基于DMMN的新型DEE克服了LMB电极接口兼容性的传统电解质限制.
- 这种基于DMMN的DEE为提高金属电池的性能和安全性开辟了新的途径.
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