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Ren, Yilun; Ma, Yujie; Wang, Biao; Chang, Shaozhong; Zhai, Qingxi; Wu, Hao; Dai, Yuming; Yang, Yurong; Tang, Shaochun; Meng, Xiangkang
Small (Weinheim an der Bergstrasse, Germany), 09/2023, Volume: 19, Issue: 36Journal Article
Most catalysts cannot accelerate uninterrupted conversion of polysulfides, resulting in poor long-cycle and high-loading performance of lithium-sulfur (Li-S) batteries. Herein, rich p-n junction CoS /ZnS heterostructures embedded on N-doped carbon nanosheets are fabricated by ion-etching and vulcanization as a continuous and efficient bidirectional catalyst. The p-n junction built-in electric field in the CoS /ZnS heterostructure not only accelerates the transformation of lithium polysulfides (LiPSs), but also promotes the diffusion and decomposition for Li S the from CoS to ZnS avoiding the aggregation of lithium sulfide (Li S). Meanwhile, the heterostructure possesses a strong chemisorption ability to anchor LiPSs and superior affinity to induce homogeneous Li deposition. The assembled cell with a CoS /ZnS@PP separator delivers a cycling stability with a capacity decay of 0.058% per cycle at 1.0 C after 1000 cycles, and a decent areal capacity of 8.97 mA h cm at an ultrahigh sulfur mass loading of 6 mg cm . This work reveals that the catalyst continuously and efficiently converts polysulfides via abundant built-in electric fields to promote Li-S chemistry.
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