有机电解质添加剂:在先进的Li-S电池中实现快速硫转化和稳定的沉积的双重功能
Yahui Liu1, Kuikui Xiao1, Shuo Yang1,2
1Key Laboratory of Carbon Materials of Zhejiang Province, Wenzhou University, Wenzhou, 325035, China.
Small (Weinheim an der Bergstrasse, Germany)
|February 29, 2024
概括
化 (BzCl) 添加剂通过改善硫氧化还原动力学和在金属上形成保护性固体电解质介相来增强硫 (Li-S) 电池,提高性能和稳定性.
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:
- -硫 (Li-S) 电池提供高能量密度,但面临来自缓慢的硫氧化还原动力学和树增长的挑战.
- 这些问题限制了Li-S电池技术的商业可行性.
研究的目的:
- 通过引入有机电解质添加剂,化 (BzCl) 来解决Li-S电池的局限性.
- 为了提高硫氧化还原动力学和金属阳极稳定性.
主要方法:
- BzCl被添加到Li-S电池的电解质中.
- 研究了BzCl与多硫化物的反应机制.
- 分析了金属阳极上的固体电解质介相 (SEI) 的组成和特性.
主要成果:
- BzCl分解为Bz·激素,形成Bz-S-Bz中间体,加速硫的转化.
- 在阳极上形成了一个强大的有机丰富的SEI层 (LiCl,LiF,Li2O),增强了离子导电性并阻断了侧面反应.
- 经过修改的Li-S电池在0.5°C的220个循环后,在低衰变率 (0.11%) 的情况下,实现了693.2 mAh g-1的高容量.
结论:
- 在Li-S电池中,BzCl有效地减轻了缓慢的硫动力学和树的生长.
- 本研究提出了一种新的电解质设计策略,以提高Li-S电池的电化学性能.
- 这些发现为开发下一代高性能储能设备提供了宝贵的指导.
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