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Hollow CoS2@C nanocubes for high-performance sodium storage
Applied Surface Science ( IF 6.7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.apsusc.2020.146268
Zhipeng Zhao , Shuaihui Li , Chuanqi Li , Zhongyi Liu , Dan Li

Abstract Exploration for high energy density, power density, and cyclability is challengeable to the application of sodium ion batteries (SIBs). Cobalt sulfide (CoS2) nanomaterials have been applied in the various energy storage and conversion fields. In this work, Co(OH)2 hollow nanocubes derived CoS2@C composite was successfully synthesized through the carbon coating and sulfidation processes. The three-dimensional hollow architecture can not only effectively restrict the volume expansion, but also shorten the ion/electron transport pathway and provide more active sites for reaction. The CoS2@C electrode exhibited outstanding cycling performance (529.3 mA h g−1 at 0.1 A g−1 after 100 cycles and 367.6 mA h g−1 at 5 A g−1 after 200 cycles) and superior rate capacity (302.8 mA h g−1 at 10 A g−1) for sodium storage. The kinetic analysis indicates that the pseudocapacitive behavior dominated the sodium storage of the CoS2@C hollow cubes.

中文翻译:

用于高性能钠存储的空心 CoS2@C 纳米立方体

摘要 探索高能量密度、功率密度和可循环性是钠离子电池(SIBs)应用面临的挑战。硫化钴(CoS2)纳米材料已应用于各种能量存储和转换领域。在这项工作中,通过碳涂层和硫化过程成功合成了 Co(OH)2 中空纳米立方体衍生的 CoS2@C 复合材料。三维中空结构不仅可以有效限制体积膨胀,还可以缩短离子/电子传输路径,为反应提供更多的活性位点。CoS2@C 电极表现出出色的循环性能(100 次循环后 0.1 A g-1 时为 529.3 mA hg-1,200 次循环后 5 A g-1 时为 367.6 mA hg-1)和优异的倍率容量(302.8 mA hg-1在 10 A g-1) 下储存钠。
更新日期:2020-07-01
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