One stone two birds:Dual-effect kinetic regulation strategy for practical lithium-sulfur batteries

• 作者: Xi-Yao Li Qiang Zhang
• 来源期刊: 能源化学
• 年，卷（期）: 2022,（2）
• 页码范围: 302-303
• 页数: 2页
• 语种: 英文

摘要

Lithium-sulfur (Li-S) batteries are deemed as one of the most promising energy storage systems due to their ultrahigh theoreti-cal energy density of 2600 Wh kg-1 far beyond the current lithium-ion battery technique [1].Generally,the sulfur redox reac-tions undergo complex conversion processes between solid sulfur(S8),soluble lithium polysulfides (LiPSs,Li2Sn,4 ≤ n ≤ 8),and solid lithium sulfide (Li2S) to afford high specific capacity of 1672 mAh g-1 [2,3].However,the sluggish kinetics of the above-mentioned multi-electron and multi-phase sulfur redox reactions [4,5] seri-ously hinder the actual battery performances regarding poor rate responses,low Coulombic efficiency,and limited cycling lifespan[6,7].Worse still,the formation of LiPS clusters under practical working conditions such as under lean electrolyte or varied tem-peratures further aggravates the sulfur redox kinetics severely[8,9].Hence,approaches to regulate the properties of LiPSs are essential for high performance Li-S batteries.