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首页> 外文期刊>RSC Advances >Formation of graphene-encapsulated CoS2 hybrid composites with hierarchical structures for high-performance lithium-ion batteries
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Formation of graphene-encapsulated CoS2 hybrid composites with hierarchical structures for high-performance lithium-ion batteries

机译：具有用于高性能锂离子电池的分层结构的石墨烯封装的COS2混合复合材料

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摘要

Transitionmetal sulfides (TMSs) are considered as themost promising alternative anodematerials for advanced lithium-ion batteries (LIBs). Here, we report a hierarchically structured CoS2 nanosphere/graphene (CoS2/G) composite, fabricated by a simple hydrothermal method. This composite, assembled with CoS2 nanoparticles uniformly distributed on the graphene, exhibits excellent electrochemical performance. In particular, the CoS2/G electrode material delivers a high rate capability of around 398 mA h g(-1) at a current density of 3500 mA g(-1). Moreover, a discharge capacity of about 400 mA h g(-1) can be obtained after 1000 cycles at a current density of 500 mA g(-1). X-ray absorption spectroscopy is used to characterize the sample for the first time, and the results demonstrate that CoS2/G is reduced to metallic Co and Li2S when discharged to 0.01 V. In subsequent charge-discharge processes, the metallic Co cannot be fully oxidized to CoS2, which is the main cause of capacity loss for the CoS2 electrode.
机译：过渡硫化硫化物（TMS）被认为是用于高级锂离子电池（LIBS）的对比替代脂肪物质。在这里，我们报告了一种分层结构化的COS2纳米/石墨烯（COS2 / g）复合材料，通过简单的水热法制造。用均匀分布在石墨烯上的COS2纳米颗粒组装的这种复合材料表现出优异的电化学性能。特别地，COS2 / g电极材料以3500mA g（-1）的电流密度为大约398mA H g（-1）的高速率能力。此外，在电流密度为500mA g（-1）之后，可以在1000次循环之后获得约400mA H（-1）的放电容量。 X射线吸收光谱首次用于表征样品，结果表明，当在随后的充电 - 放电过程中，COS2 / g减少到金属CO和LI2S，金属CO不能完全氧化成COS2，这是COS2电极容量损耗的主要原因。

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  • 来源
    《RSC Advances》 |2017年第63期|共7页
  • 作者

    Tao Shi; Huang Weifeng; Xie Hui; Zhang Jing; Wang Zhicheng; Chu Wangsheng; Qian Bin; Song Li;

  • 作者单位

    Changshu Inst Technol Jiangsu Lab Adv Funct Mat Dept Phys &

    Elect Engn Changshu 215500 Jiangsu Peoples R China;

    Peking Univ Coll Engn Beijing 100871 Peoples R China;

    Univ Sci &

    Technol China Natl Synchrotron Radiat Lab Hefei 230026 Anhui Peoples R China;

    Changshu Inst Technol Jiangsu Lab Adv Funct Mat Dept Phys &

    Elect Engn Changshu 215500 Jiangsu Peoples R China;

    Changshu Inst Technol Jiangsu Lab Adv Funct Mat Dept Phys &

    Elect Engn Changshu 215500 Jiangsu Peoples R China;

    Univ Sci &

    Technol China Natl Synchrotron Radiat Lab Hefei 230026 Anhui Peoples R China;

    Changshu Inst Technol Jiangsu Lab Adv Funct Mat Dept Phys &

    Elect Engn Changshu 215500 Jiangsu Peoples R China;

    Univ Sci &

    Technol China Natl Synchrotron Radiat Lab Hefei 230026 Anhui Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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