多硫化物
氧化还原
阳极
电解质
锂(药物)
化学
有机自由基电池
阴极
硫黄
动力学
无机化学
化学工程
材料科学
电极
有机化学
物理化学
内分泌学
工程类
物理
医学
量子力学
作者
Yiran Liu,Meng Zhao,Li‐Peng Hou,Zheng Li,Chen‐Xi Bi,Zi‐Xian Chen,Qian Cheng,Xue‐Qiang Zhang,Bo‐Quan Li,Stefan Kaskel,Jia‐Qi Huang
标识
DOI:10.1002/anie.202303363
摘要
Lithium-sulfur (Li-S) batteries are regarded as promising high-energy-density energy storage devices. However, the cycling stability of Li-S batteries is restricted by the parasitic reactions between Li metal anodes and soluble lithium polysulfides (LiPSs). Encapsulating LiPS electrolyte (EPSE) can efficiently suppress the parasitic reactions but inevitably sacrifices the cathode sulfur redox kinetics. To address the above dilemma, a redox comediation strategy for EPSE is proposed to realize high-energy-density and long-cycling Li-S batteries. Concretely, dimethyl diselenide (DMDSe) is employed as an efficient redox comediator to facilitate the sulfur redox kinetics in Li-S batteries with EPSE. DMDSe enhances the liquid-liquid and liquid-solid conversion kinetics of LiPS in EPSE while maintains the ability to alleviate the anode parasitic reactions from LiPSs. Consequently, a Li-S pouch cell with a high energy density of 359 Wh kg-1 at cell level and stable 37 cycles is realized. This work provides an effective redox comediation strategy for EPSE to simultaneously achieve high energy density and long cycling stability in Li-S batteries and inspires rational integration of multi-strategies for practical working batteries.
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