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首页> 外文期刊>RSC Advances >Fabricating three-dimensional mesoporous carbon network-coated LiFePO4/Fe nanospheres using thermal conversion of alginate-biomass
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Fabricating three-dimensional mesoporous carbon network-coated LiFePO4/Fe nanospheres using thermal conversion of alginate-biomass

机译：使用藻酸盐生物质的热转化制造三维介孔碳网络涂覆的LiFepo4 / Fe纳米球

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摘要

The lack of cathode materials with high energy density has become a bottleneck for the development of low-cost lithium-ion batteries (LIBs). Here, we develop three-dimensional mesoporous carbon network (3DMCN)-coated LiFePO4/Fe nanospheres (3DMCN-LFP/Fe-NSs) for tackling this problem. This new nanocomposite cathode is synthesized by using thermal conversion of natural alginate (ALG) biomass. In the heat-treated process, an ALG hydrogel with an "egg-box" structure was transformed into unique 3DMCN, while some of the iron ions were reduced to iron metal. The 3DMCN and Fe metal coating not only reduces the anisotropy and grain size of LiFePO4, but also enhances its electron conductivity and lithium ion diffusion coefficient. This makes this specially designed nanocomposite give a remarkable synergistic effect for both lithium storage and transfer kinetics. After 256 cycles the discharge capacity (173 mA h g(-1)) was still higher than the theoretical capacity of LiFePO4, and its capacity retention rate is 99%. Even at a high current rate of 10C, the discharge energy density is still 6.2 times that of commercial LiFePO4. More importantly, this nanocomposite is created through a simple and cost-effective approach. This work also opens a new vista for applying renewable biomass conversion technology to develop superior LIBs.
机译：缺乏高能量密度的阴极材料已成为开发低成本锂离子电池（LIBS）的瓶颈。在这里，我们开发三维中孔碳网络（3DMCN） - 涂层的LiFePO4 / Fe纳米球（3DMCN-LFP / FE-NSS）来解决这个问题。通过使用天然藻酸盐（ALG）生物质的热转化合成该新的纳米复合材料阴极。在热处理过程中，将具有“蛋盒”结构的ALG水凝胶转化为独特的3DMCN，而一些铁离子被降低到铁金属。 3DMCN和Fe金属涂层不仅降低了LiFePO4的各向异性和晶粒尺寸，而且还提高了其电子电导率和锂离子扩散系数。这使得该专门设计的纳米复合材料对锂储存和转移动力学具有显着的协同效果。在256次循环后，放电容量（173 mA H（-1））仍高于LiFePO4的理论能力，其容量保持率为99％。即使在10℃的高电流率，放电能量密度仍然是商业Lifepo4的6.2倍。更重要的是，该纳米复合材料是通过简单且经济高效的方法产生的。这项工作还开辟了一个新的Vista，用于应用可再生生物量转换技术来开发卓越的LIB。

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  • 来源
    《RSC Advances》 |2016年第21期|共8页
  • 作者

    Guo Hui; Zhang Xudong; He Wen; Yang Xuena; Liu Qinze; Li Mei; Wang Jichao;

  • 作者单位

    Qilu Univ Technol Inst Mat Sci &

    Engn Jinan 250353 Peoples R China;

    Qilu Univ Technol Inst Mat Sci &

    Engn Jinan 250353 Peoples R China;

    Qilu Univ Technol Inst Mat Sci &

    Engn Jinan 250353 Peoples R China;

    Qilu Univ Technol Inst Mat Sci &

    Engn Jinan 250353 Peoples R China;

    Qilu Univ Technol Inst Mat Sci &

    Engn Jinan 250353 Peoples R China;

    Qilu Univ Technol Inst Mat Sci &

    Engn Jinan 250353 Peoples R China;

    Qilu Univ Technol Inst Mat Sci &

    Engn Jinan 250353 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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