Catalytic FeP decorated carbon black as a multifunctional conducting additive for high-performance lithium-sulfur batteries
Catalytic FeP decorated carbon black as a multifunctional conducting additive for high-performance lithium-sulfur batteries
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DOI：
10.1016/j.carbon.2020.09.094
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发表时间：
2021-02
期刊：
影响因子：
10.9
通讯作者：
G. Xia;Jiajia Ye;Zhiqiang Zheng;Xuting Li;Chuanzhong Chen;Cheng Hu
中科院分区：
文献类型：
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作者：
G. Xia;Jiajia Ye;Zhiqiang Zheng;Xuting Li;Chuanzhong Chen;Cheng Hu
Sulfur hosts with high sulfur affinities and catalytic activities are widely studied for lithium-sulfur batteries to tackle polysulfide shuttling and the sluggish sulfur redox kinetics. Although conducting additives (typically carbon black) are essential components in slurry-coated cathodes, their modification received much less attentions as an alternative solution to the above-mentioned issues. Herein, we demonstrate that introducing catalytic materials to the conventional conducting additive of carbon black acts as a feasible strategy to improve battery performance. Super P carbon black decorated with FeP nanoparticles (SP/FeP) is synthesized using a scalable method and served as the conducting additive in sulfur cathodes constructed from common carbon hosts, namely carbon nanotubes and nanofibers. At a low addition of SP/FeP of 10 wt% (the conventional 8:1:1 recipe), SP/FeP exhibits strong sulfur immobilizations and effective electrocatalysis for the liquid-liquid and liquid-solid transitions. High specific capacities (1518 mAh g−1at 0.2 C), excellent rating performance (728 mAh g−1at 5 C) and stable long-term cycling are achieved. Pouch cells with a 7.0 mg cm−2sulfur loading are also demonstrated to present high areal capacities and charge/discharge stabilities. Electrochemical measurements and density functional theory calculations were performed to reveal the working mechanism of the SP/FeP conducting additive.
