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一种缓解膨胀的粘合剂,用于高负载硫电池的稳定循环

Avinash Raulo¹, Saheed A Lateef¹, Golareh Jalilvand¹

¹Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States.

ACS applied materials & interfaces

|April 23, 2025

概括

研究人员开发了一种交联结合剂,以提高硫电池的性能. 这种方法抑制了聚硫化物转运,并提高了高硫载荷的稳定性,为商业化铺平了道路.

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) 电池具有较高的理论能量密度,但在高硫负载时会发生容量衰减.
在化过程中,聚硫化物穿和体积膨胀降低了Li-S电池的性能.
商业可行性需要稳定运行在工业相关的硫质量负载 (≥ 4 mg cm-2).

研究的目的:

制定一种策略,以抑制聚硫化物转运和减轻Li-S电池的体积膨胀.
为了提高高硫载荷的Li-S电池的电化学性能和循环寿命.
研究粘合剂修改对Li-S电池稳定性的影响.

主要方法:

聚乙烯化物 (PVDF) 粘合剂在硫阴极中的交联.
交联PVDF的化学,机械和结构性质的表征.
在高硫载荷 (4 mg cm−2) 的情况下,对含有修改结合剂的 Li-S 细胞进行电化学测试.

主要成果:

交叉连接的PVDF粘合剂有效抑制了聚硫化物的转运和限制了硫的扩张.
与交叉连接的PVDF相比,与标准PVDF相比,硫阴极的周期寿命显著延长.
带有修改结合剂的电池在200多个周期内实现了稳定的循环,在硫载荷为4毫克/厘米-2时具有>97%的库伦比克效率.

结论:

绑定器交叉链接是一个可行的策略,以克服Li-S电池技术的关键挑战.
这种方法可以使用商业上相关的硫载荷实现稳定的高能量密度存储.
该方法通过使用常见的粘合剂材料,为推进Li-S电池的商业化提供了一条道路.

关键词:

粘合剂粘合剂粘合剂交叉链接是指交叉链接.硫电池是硫电池的一种.长寿长寿是一个问题.穿效应的穿效应大量的扩张量扩张.

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