4.7 Article

Self-assembled flower-like structure of copper cobaltate nanosheets supported on nitrogen-doped carbon nanofibers as functional electrocatalyst for lithium/polysulfides batteries

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JOURNAL OF ALLOYS AND COMPOUNDS
卷 934, 期 -, 页码 -

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.167916

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Membrane electrode; Shuttle suppression; Lithium-sulfur batteries

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In this study, a self-assembled flower-like structure of copper cobaltate nanosheets modified nitrogen-containing carbon nanofibers hybrid was designed as a membrane electrode for lithium/polysulfide batteries. It effectively inhibits the polysulfide shuttle effect and enhances the redox kinetics of lithium polysulfides, leading to improved electrochemical performance.
The polysulfides shuttle effect and torpid kinetic are of the crucial barriers for lithium-sulfur batteries. Herein, self-assemble flower-like structure of copper cobaltate (CuCo2O4: CCO) nanosheets modified ni-trogen-containing carbon nanofibers hybrid (denoted as CCONCFs) were designed as membrane electrode containing Li2S6 catholyte for lithium/polysulfides batteries, which promote electrochemical performance by inhibiting shuttle effect and enhancing the redox kinetics of lithium polysulfides. The conductive NCFs provide fast electronic transport and CCO nanosheets possess a strong affinity to sulfur species, which could effectively adsorb lithium polysulfides, boost their redox reaction catalytically-accelerate the reversible soluble/insoluble phases conversion, and greatly improve the utilization of active material. The results show that CCONCFs membrane electrode with 4.43 mg/cm2 sulfur loading exhibited stability cycling capacity, which delivered a high initial capacity of 1207 mA h/g at 0.2 C and sustain a capacity of 827 mA h/g after 350 cycles. Even at 8.85 mg/cm2 sulfur loading, the composite electrode shows a high specific capacity of 861 mA h/g and still maintains 733 mA h/g after 180 cycles. The assembled pouch cell with CCONCFs membrane was obtained with a specific energy density of 455 W h/kg.(c) 2022 Elsevier B.V. All rights reserved.

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