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离子合聚烯三维框架使硫电池的吸附和转化成为可能

Guowei Yu¹, Chen-Yang Wang¹, Wenda Dong²

¹Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China.

Journal of colloid and interface science

|October 15, 2023

概括

引入SO2-化聚烯纳米线显著提高硫 (Li-S) 电池性能,通过抑制聚硫化物穿和促进转换. 这种离子兴奋剂策略改善了Li-S电池的循环寿命和容量.

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) 电池具有高的理论能量密度,但由于聚硫化物穿效应,其周期寿命较短.
需要有效的策略来限制聚硫化物和加速它们的转化,以提高Li-S电池的性能.

研究的目的:

开发一种用于Li-S电池的新型硫宿主材料,使用SO4化聚烯 (PPy-SO4) 纳米线.
调查阴离子兴奋剂在抑制穿效应和增强聚硫化物转化中的作用.
评估使用PPy-SO₄/S阴极的Li-S电池的电化学性能和循环稳定性.

主要方法:

制造一个SO₄^2--doped聚烯纳米线的3D相互连接框架.
材料结构和性能的表征.
用PPy-SO₄/S阴极组装和电化学测试Li-S电池,包括循环测试和袋式电池验证.

主要成果:

该PPy-SO₄框架通过极极相互作用有效地限制了多硫化物 (LiPS),抑制了穿效应.
阳离子兴奋剂增强了聚烯导电性,并促进了加速的聚硫化物转化.
带有PPy-SO₄/S阴极的Li-S电池在1°C的350个循环后表现出501mAhg-1的稳定容量,衰变率低 (每循环为0.09%).
袋式电池在250个循环后达到480mAh-1的容量,证实了该战略的实际可行性.

结论:

用SO₄^2-对聚烯的阳离子兴奋剂是一种提高Li-S电池性能的有效策略.
PPy-SO₄框架的合理结构设计改善了聚硫化物限制和电化学动力学.
这种方法为开发高性能和持久的Li-S电池提供了可行的解决方案.

关键词:

三维互联框架 3D互联框架离子添加的 PPy 含有离子.转化反应的动力学硫电池的使用方法强大的吸附性强.

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