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一个逐步的设计策略来实现高性能硫电池

Matthew J Dent¹, Sean Grabe¹, Steven J Hinder¹

¹Centre for Engineering Materials, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, U.K.

ACS applied energy materials

|February 14, 2025

概括

高性能硫 (Li-S) 电池是通过结合PEDOT:PSS阴极主体,--石墨烯 (BNG) 介层和丝纤维蛋白电解质添加剂来实现的. 这一策略通过捕获多硫化物和抑制树突来提高能量密度和循环能力.

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) 电池在理论上具有很高的能量密度,但其循环能力较差,硫利用率较低.
关键的挑战包括聚硫化物转运,活性硫损失和阳极降解.

研究的目的:

制定一项综合战略,以提高Li-S电池的能量密度和可循环使用性.
研究新型阴极材料,介层和电解质添加剂的协同效应.

主要方法:

用PEDOT:PSS粘合剂制造一个空洞的多孔纳米粒子阴极,用于聚硫化物捕获.
--石墨烯 (BNG) 介层作为电催化剂和聚硫化物陷的整合.
在电解质中添加半导体酸 (VOPc或CoPc) 和丝纤维蛋白.
实验性表征和多孔连续体物理化学建模与分子动力学模拟.

主要成果:

在所有测试的配置中,BNG中间层显著提高了细胞性能.
一个带有PEDOT:PSS阴极,BNG中间层和丝纤维素的Li-S电池实现了1372 mAh g_S-1 (1次放电) 和920 mAh g_S-1 (100次放电) 的45 wt%S.
一个带有 PEDOT:PSS 阴极,BNG 中间层和 VOPc/CoPc 阴解质的 Li-S 电池产生了 805 mAh g_S^-1 (1 次放电) 和 586 mAh g_S^-1 (100 次放电) 的 55 wt% S.

结论:

这种联合策略有效地抑制了聚硫化物穿和树的生长,提高了Li-S电池的性能.
BNG中间层对于改善电子转移和催化活性至关重要,从而提高循环能力和能量密度.
这种方法为开发高性能和耐用的Li-S电池提供了一个有希望的途径.

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