用于改善可充电Li-S电池的界面化学的同位素有机乙醇添加剂
Jing Lian1, Wei Guo1, Yongzhu Fu1
1College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China.
Journal of the American Chemical Society
|July 15, 2021
概括
甲基,特别是1,4-BDT,通过抑制聚硫化物穿和稳定阳极,提高硫 (Li-S) 电池的性能. 这种新型的电解质添加剂提高了Li-S细胞的循环稳定性和容量保留.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- -硫 (Li-S) 电池具有较高的理论能量密度,但存在多硫化物穿和不稳定的阳极接口.
- 目前的研究重点是电解质添加剂,以减轻这些性能限制.
研究的目的:
- 调查二甲醇 (BDTs) 作为电池的新型电解质添加剂.
- 评估不同BDT异构体,特别是1,4-BDT在提高电池性能方面的有效性.
主要方法:
- 二醇异构体的合成和表征.
- 用BDT添加剂对Li-S细胞和Li/Li对称细胞进行电化学测试.
- 分析由1,4-BDT引起的化学相互作用和结构变化.
主要成果:
- 与其他异构体相比,1,4-BDT表现出优异的性能,通过硫寡合化有效抑制穿效应.
- 在阳极上观察到稳定的固体电解质间相 (SEI),使得在低过电势下稳定循环.
- 使用1,4-BDT的Li-S电池表现出增强的循环稳定性,高初始容量 (1548.5 mAh g-1),以及优异的可逆容量 (1306.9 mAh g-1在200个循环后).
- 在C/10速率下26个循环后,Li-S囊细胞保持了84. 2%的容量.
结论:
- 1,4-BDT是高级Li-S电池的有效功能电解质添加剂.
- 1,4-BDT为克服Li-S电池技术的关键挑战提供了有希望的策略,为改进的储能解决方案铺平了道路.
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