锂(药物)
材料科学
硫化物
无定形固体
硫黄
电解质
溶解
无机化学
化学工程
碳纤维
电化学
无定形碳
化学
物理化学
电极
有机化学
冶金
复合材料
医学
复合数
工程类
内分泌学
作者
Huadong Yuan,Jianhui Zheng,Gongxun Lu,Liang Zhang,Tianran Yan,Jianmin Luo,Yao Wang,Yujing Liu,Tianqi Guo,Zhongchang Wang,Jianwei Nai,Xinyong Tao
标识
DOI:10.1002/adma.202400639
摘要
Abstract Lithium‐sulfur (Li‐S) batteries, operated through the interconversion between sulfur and solid‐state lithium sulfide, have been regarded as next‐generation energy storage systems. However, the sluggish kinetics of lithium sulfide deposition/dissolution, caused by its insoluble and insulated nature, hampers the practical use of Li‐S batteries. Herein, leaf‐like carbon scaffold (LCS) with the modification of Mo 2 C clusters (Mo 2 C@LCS) is reported as host material of sulfur powder. During cycles, the dissociative Mo ions at the Mo 2 C@LCS/electrolyte interface are detected to exhibit competitive binding energy with Li ions for lithium sulfide anions, which disrupts the deposition behavior of crystalline lithium sulfide and trends a shift in the configuration of lithium sulfide towards an amorphous structure. Combining the related electrochemical study and first‐principle calculation, it is revealed that the formation of anorphous lithium sulfides shows significantly improved kinetics for lithim sulfides deposition and decomposition. As a result, the obtained Mo 2 C@LCS/S cathode shows an ultralow capacity decay rate of 0.015% per cycle at a high mass loading of 9.5 mg cm −2 after 700 cycles. More strikingly, an ultrahigh sulfur loading of 61.2 mg cm −2 can also be achieved. Our work defines an efficacious strategy to advance the commercialization of Mo 2 C@LCS host for Li‐S batteries. This article is protected by copyright. All rights reserved
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