氧化还原
硫黄
动力学
化学
多硫化物
锂(药物)
化学工程
储能
材料科学
无机化学
热力学
电解质
电极
物理化学
有机化学
功率(物理)
工程类
内分泌学
量子力学
物理
医学
作者
Yan‐Qi Peng,Meng Zhao,Zi‐Xian Chen,Qian Cheng,Yiran Liu,Zhao Chang-xin,Xinzhi Ma,Bo‐Quan Li,Cheng‐Meng Chen,Jia‐Qi Huang,Qiang Zhang
标识
DOI:10.1002/batt.202100359
摘要
Abstract Lithium‐sulfur (Li−S) battery is considered as a promising energy storage system because of its high theoretical energy density of 2600 Wh kg −1 , whose practical performance is limited by the sluggish sulfur redox kinetics. Homogeneous redox mediators (RMs) are effective promotors to propel the sulfur redox kinetics. However, most of the RMs only focus on a single reaction process. Herein, a strategy of mixed redox mediators (mixed‐RM) is proposed for full‐range redox mediation on the sulfur redox kinetics in working Li−S batteries. Concretely, one of the mixed‐RM mainly mediates the liquid‐solid reduction from polysulfides (LiPSs) to Li 2 S during discharge, while the other aims to promote the solid‐liquid conversion from Li 2 S to LiPSs and the liquid‐solid conversion from LiPSs to S 8 during charge. Consequently, 2.5 Ah Li−S pouch cells with the mixed‐RM achieve an actual initial energy density of 354 Wh kg −1 alongside stable 20 cycles. This work provides an effective strategy on promoting the sulfur redox kinetics for high‐energy‐density Li−S batteries and inspires rational combination of novel functional molecules for practical energy storage systems.
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