递归溶剂的可溶性激活减轻了高性能离子电池的相间溶解
Yuhang Guo1, Chengzong Li1, Xin Li1
1School of Resource Environment and Safety Engineering, University of South China, Hengyang, 421001, China.
Angewandte Chemie (International ed. in English)
|January 17, 2026
概括
离子电池 (NIB) 的新型电解质设计通过使用递归溶剂激活策略来防止固体电解质间相 (SEI) 溶解. 这种方法提高了电池的稳定性和寿命,减少了容量衰变和气体演变.
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:
- 在离子电池 (NIB) 中,固体电解质间相 (SEI) 溶解导致电解质分解,气体演变,容量衰减和安全问题.
- 减少电解质溶解功率可以减轻SEI溶解,但通常会损害离子导电性.
研究的目的:
- 开发一种弱溶解电解质 (WSE),保持高离子导电性,同时防止SEI在NIB中溶解.
- 设计一个稳定和强大的有机丰富的SEI层,以提高NIB的性能和安全性.
主要方法:
- 一种使用1,2-环氧-3,3,3-三二 (TFPO) 和二乙烯糖醇二乙烯 (DEE) 的递归溶剂激活策略.
- 配制具有低DEE含量 (24体积%) 和高离子-DEE比率的WSE.
- 电化学测试全电池 (硬碳 NaMn0.33Fe0.33Ni0.33O2) 和 1.0 Ah 袋式电池.
主要成果:
- 该DEE-TFPO系统展示了可调节的溶解行为,使WSE的设计成为可能.
- 优化的WSE减轻了溶剂诱导的SEI溶解,并促进了富含无机物的SEI层.
- 在500个循环后,全电池保持了80.0%的容量;在230个循环后,在抑制气体释放的情况下,1.0 Ah袋电池保持了99.5%的容量.
结论:
- 递归溶剂激活策略有效地平衡了NIB电解质中的溶解功率和离子导电性.
- 开发的WSE显著提高了离子电池的循环寿命和安全性.
- 这种方法为开发高性能和稳定的离子储能系统提供了一个有希望的途径.
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