易冷的塑料晶体变成电池的冷液体电解质,通过深度结点压缩
Do Sol Cheong1, Eun Seon Heo1, Jinki Hong1
1School of Energy and Chemical Engineering, UNIST, Ulsan, 44919, South Korea.
Small (Weinheim an der Bergstrasse, Germany)
|August 20, 2024
概括
这项研究引入了硫烯作为离子电池电解质的新型溶剂,使得从极寒 (-80°C) 到高温 (+150°C) 的操作成为可能. 这一突破扩大了先进电池应用的工作温度范围.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 低温离子电池 (LIB) 电解质面临着与沸点 (Tb) 同步的结点 (Tf) 的挑战,限制了热稳定性.
- 现有的低Tf溶剂由于Tb的减少而损害了高温性能.
- 需要具有广泛工作温度窗口的电解质,覆盖极端的寒冷和热量.
研究的目的:
- 开发一种新的电解质溶剂,扩大离子电池 (LIB) 的工作温度范围.
- 为了解决LIB电解质中低点 (Tf) 和高沸点 (Tb) 之间的权衡.
- 为了提高LIBs的热稳定性和低温性能.
主要方法:
- 利用了硫,一种高Tf和高Tb溶剂,具有高低温常数 (Kf),由于其独特的等态性质.
- 在硫电解液中配制了一种2m二三甲硫) 胺 (LiTFSI).
- 测试了使用LiFePO4和Li金属阴极的LIB电池在广泛的温度范围内,包括-74°C和+80°C.
主要成果:
- 电解质的液相温度窗口非常宽,从 -80°C以下到 +150°C以上.
- 硫烯的高Kf (66.4K·m−1) 可以显著降低结点,但不影响沸点.
- 在室温,-30°C,-74°C和+80°C下,LIB细胞表现稳定.
结论:
- 基于硫的电解质提供了一个可行的解决方案,可以在冷和热条件下延长LIB工作温度.
- 硫的独特特性克服了电池电解质中传统的Tf-Tb限制.
- 这一进步对开发用于各种应用的下一代电池产生了重大影响.
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