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首页> 外文期刊>RSC Advances >Three-dimensional porous carbon nanosheet networks anchored with Cu6Sn5@carbon as a high-performance anode material for lithium ion batteries
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Three-dimensional porous carbon nanosheet networks anchored with Cu6Sn5@carbon as a high-performance anode material for lithium ion batteries

机译：用Cu6SN5碳固定的三维多孔碳纳米型网络作为锂离子电池的高性能阳极材料

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摘要

The poor cycling stability resulting from large volume change is the major obstacle to the application of tinbased anode materials. In this paper, three-dimensional porous carbon nanosheet networks anchored with Cu6Sn5@carbon nanoparticles (10-35 nm) as a high-performance anode for lithium ion batteries are synthesized via a self-assembly NaCl template-assisted in situ chemical vapor deposition strategy. The composite exhibits superior rate capability (523, 443, 395, 327, 281, and 203 mA h g(-1) at 0.2, 0.5, 1, 2, 5, and 10 A g(-1), respectively) and excellent cycling stability (396.8 mA h g(-1) at 1 A g(-1) for the first cycle and maintains 92.3% after 200 cycles). The superior performance is attributed to the unique architecture: inactive metal copper serves as a "buffer matrix" and relaxes the large volume change of the tin; a uniform distribution of nano-sized Cu6Sn5 makes the inevitable stress/strain small, meanwhile it provides a short path for lithium ion diffusion; onion-like carbon shells not only prevent the Cu6Sn5 nanoparticles from agglomerating and growing but also offer mechanical support to accommodate the stress associated with the volume change of tin upon cycling, thus alleviating pulverization; 3D porous carbon nanosheet networks ensure the mechanical integrity and facilitate lithium ion diffusion as well as electron transportation.
机译：由于大体积变化而导致的循环稳定性差是应用锡的阳极材料的主要障碍。本文通过自组装NaCl模板，合成了用Cu6SN5 @碳纳米粒子（10-35nm）作为锂离子电池的高性能阳极锚定的三维多孔碳纳米片网络，以原位化学气相沉积策略合成。复合材料在0.2,0.5,1,2,5和10Ag（-1）分别显示出优异的速率能力（523,443,395,327,281和203 mA Hg（-1））和优异的循环稳定性（396.8 mA Hg（-1）在1Ag（-1），第一次循环，200次循环后保持92.3％）。卓越的性能归因于独特的架构：非活性金属铜用作“缓冲矩阵”，放宽锡的大容量变化;纳米Cu6Sn5的均匀分布使得不可避免的应力/应变小，同时它提供了锂离子扩散的短路径;洋葱状碳壳不仅可以防止Cu6Sn5纳米颗粒聚集和生长，而且还提供机械支撑，以适应与循环时锡的体积变化相关的应力，从而减轻粉碎; 3D多孔碳纳米片网络确保机械完整性，促进锂离子扩散以及电子传输。

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  • 来源
    《RSC Advances》 |2016年第60期|共9页
  • 作者

    Wang Zhiyuan; Luo Shaohua; Chen Fang; Wang Dan; Liu Yanguo; Qi Xiwei; Shi Chunsheng; Zhao Naiqin;

  • 作者单位

    Northeastern Univ Qinhuangdao Sch Resources &

    Mat Qinhuangdao 066004 Peoples R China;

    Northeastern Univ Qinhuangdao Sch Resources &

    Mat Qinhuangdao 066004 Peoples R China;

    Northeastern Univ Qinhuangdao Sch Resources &

    Mat Qinhuangdao 066004 Peoples R China;

    Northeastern Univ Qinhuangdao Sch Resources &

    Mat Qinhuangdao 066004 Peoples R China;

    Northeastern Univ Qinhuangdao Sch Resources &

    Mat Qinhuangdao 066004 Peoples R China;

    Northeastern Univ Qinhuangdao Sch Resources &

    Mat Qinhuangdao 066004 Peoples R China;

    Tianjin Univ Sch Mat Sci &

    Engn Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Mat Sci &

    Engn Tianjin 300072 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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