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The role of graphene in nano-layered structure and long-term cycling stability of MnxCoyNizCO3 as an anode material for lithium-ion batteries

机译：石墨烯在纳米层状结构中的作用以及Mnxcoynizco3的长期循环稳定性作为锂离子电池的阳极材料

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摘要

Transition metal carbonates with high energy density of lithium storage via conversion reactions as anode materials for lithium-ion batteries are a hot research focus. However, the large volume changes during the processes of insertion/extraction of Li+ ions and low electronic conductivity are great challenges. Herein, a nano-layered MnxCoyNizCO3/graphene composite and micro-spherical MnxCoyNizCO3 are synthesized via a facile hydrothermal route in the presence and absence of graphene, respectively. As an anode material, the prepared MnxCoyNizCO3/graphene composite delivers a final 500th reversible discharge specific capacity of 1046 mA h g(-1) at 100 mA g(-1) and furthermore presents a high value of 711 mA h g(-1) at 1000 mA g(-1) after 500 cycles, which shows prominent superiority in comparison with MnxCoyNizCO3 (517 mA h g(-1) at 100 mA g(-1) after 500 cycles) and other reported works about transition metal carbonates. The high reversible capacity, long-term cycling stability and perfect rate performance of the MnxCoyNizCO3/graphene composite should be ascribed to the existence of graphene, which plays an important role in keeping the nanostructure of the sample, enhancing the electronic conductivity of the sample, preventing the aggregation of particles and accommodating volume changes of the electrode during the cycling process. Hence, the prepared MnxCoyNizCO3/graphene composite is a promising anode material for lithium-ion batteries.
机译：通过转化反应具有高能量密度的过渡金属碳酸盐作为锂离子电池的阳极材料是热门研究焦点。然而，在锂+离子的插入/提取过程中的大体积变化是巨大的挑战。在此，通过在存在和不存在石墨烯的情况下，通过容易的水热途径合成纳米层状MnxcoynizCO 3 /石墨烯复合材料和微球形MnxcoynizCo 3。作为阳极材料，制备的MNXCOYNIZCO 3 /石墨烯复合材料在100mA G（-1）下提供1046mA Hg（-1）的最终500℃可逆放电比容量，并且此外呈现高值为711 mA Hg（-1） 500次循环后1000 mA g（-1），其显示与Mnxcoynizco 3（517 mA Hg（-1）在500 mA g（-1）之后的突出优势），并且在500 mA g（-1）之后，其他报道的关于过渡金属碳酸盐的作品。高可逆容量，长期循环稳定性和Mnxcoynizco 3 /石墨烯复合材料的完美率表现应归因于石墨烯的存在，这在保持样品的纳米结构中起着重要作用，增强了样品的电子电导率，防止颗粒的聚集并在循环过程中容纳电极的体积变化。因此，制备的MnxcoynizCo 3 /石墨烯复合材料是用于锂离子电池的有希望的阳极材料。

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  • 来源
    《RSC Advances》 |2016年第107期|共10页
  • 作者

    Li Qing; Wang Chao; Li Qingqing; Che Renchao;

  • 作者单位

    Fudan Univ Adv Mat Lab Shanghai 200433 Peoples R China;

    Fudan Univ Adv Mat Lab Shanghai 200433 Peoples R China;

    Fudan Univ Adv Mat Lab Shanghai 200433 Peoples R China;

    Fudan Univ Adv Mat Lab Shanghai 200433 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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