在极端条件下使离子电池成为可能的协同阳离子和溶剂衍生界面
Sha Tan1, Oleg Borodin2, Nan Wang1
1Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States.
Journal of the American Chemical Society
|October 25, 2024
概括
研究人员使用2,2-二乙烯碳酸盐 (DFDEC) 溶剂开发了一种用于离子电池 (LIB) 的新型电解质. 这一突破为先进的储能应用提供了快速充电,高稳定性和广泛的温度性能.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 离子电池 (LIB) 需要先进的电解质来满足极端温度和快速充电等要求.
- 当前的电解质往往面临有效的离子传输和稳定的相间形成之间的权衡.
- 由阴离子衍生的交相可以阻碍离子运输,因为溶剂的溶解能力较弱.
研究的目的:
- 设计一种新型的电解质,
- 探索使用溶剂和离子进行协同相间构造.
- 确定一个有前途的溶剂高性能LIB电解质.
主要方法:
- 对新型溶剂的选,导致2,2-二乙烯碳酸盐 (DFDEC) 的鉴定.
- 使用DFDEC作为主要溶剂和二硫化物 (LiFSI) 作为盐的新电解质的配方.
- 用开发的电解质测试石墨玉米LiNi0.8Mn0.1Co0.1O2 (NMC811) 的全细胞.
主要成果:
- 新的电解质可以在4.5V的切断电压下快速充电和长期循环稳定.
- 在500个循环后实现了84.3%的容量保留,平均库伦比效率 (CE) 为99.93%.
- 在广泛的温度范围内 (-20~60°C) 证明了稳定的电池循环.
结论:
- 利用溶剂和离子进行相间形成为高性能LIB提供了一个有前途的策略.
- 基于DFDEC的电解质提供了相间稳定性和离子导电性之间的平衡.
- 开发的电解质显示出下一代离子电池的巨大潜力,需要快速充电和广泛的温度操作.
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