在硫电池中超载效应的机制和解决方案
Rong Li1, Yujia Zeng1, Lei Song1
1Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu, 610065, China.
Small (Weinheim an der Bergstrasse, Germany)
|September 4, 2023
概括
高负载硫电池的过度充电是由隔热硫层引起的. 加酸盐的添加促进了3D硫的生长,防止了这个问题,并提高了电池的性能.
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:
- 硫 (Li-S) 电池的商业化受到高硫电极挑战的阻碍.
- 在高负载的Li-S电池中,过充电是一个关键问题,经常被忽视,并且源于电流收集器上的绝缘S8层形成.
- 这种绝缘层阻碍了聚硫化物的电子转移,导致不可逆转的电极降解和过电.
研究的目的:
- 为了研究高负载Li-S电池过度充电的机制.
- 提出一种新的策略,通过控制绝缘S8层的生长来减轻过度充电.
- 通过改进的电极架构来提高Li-S电池的整体性能.
主要方法:
- 使用酸作为核化中心提供者来影响S8沉积.
- 研究了当前收集器表面上的S8层的3D增长.
- 进行了电化学测试,以评估电池性能和过度充电行为.
主要成果:
- 确定了电流收集器上的绝缘S8层的形成是过电的根本原因.
- 证明酸有效地促进S8远离当前收集器表面的3D生长.
- 通过添加酸,观察到过度充电的显著减少和电池性能的改善.
结论:
- 使用酸作为核化中心的拟议方法成功调节了S8的生长,防止在高负载Li-S电池中过度充电.
- 这种方法提供了一种可行的策略,可以克服Li-S电池技术商业化的关键障碍.
- 这些发现为开发更坚固,更有效的高能量密度Li-S电池铺平了道路.
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