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Effect of particle size distribution on the electrochemical performance of micro-sized silicon-based negative materials

机译：粒度分布对微尺寸硅基负材料电化学性能的影响

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摘要

Si has been extensively examined as a potential alternative to carbonaceous negative materials, because it shows exceptional gravimetric capacity and abundance. In recent years, the strategy of using nano-structured silicon materials as building blocks to build micro-sized silicon-based materials has been widely studied. In this work, a commercialized and benchmark micro-sized silicon-based material (denoted as SiOx/C) is used as research target and three groups of materials with different particle size distributions (PSDs) were obtained by simply mechanical sieving. The effects of PSD on the electrochemical performance and electrode structure of micro-sized silicon-based negative electrodes are discussed. The optimized selection of micro-sized active material PSD presents a comprehensive way for developing and characterizing Si-based negative electrodes for practicable high-energy LIBs. In this case, the optimized SiOx/C composite electrode with a particle size of 22.7 m and narrow PSD shows enhanced cycling stability with a high capacity retention of 84.31% over 100 cycles.
机译：Si已被广泛地检查为含碳负材料的潜在替代品，因为它显示出特殊的重量能力和丰富。近年来，广泛研究了使用纳米结构硅材料作为构建微尺寸硅基材料的粉末结构块的策略。在这项工作中，使用商业化和基准微型硅基材料（表示为SiOx / C）作为研究靶标，通过简单地机械筛分获得了三组具有不同粒度分布（PSD）的材料。讨论了PSD对微尺寸硅基负电极电化学性能和电极结构的影响。优化的微尺寸活性材料PSD选择呈现用于开发和表征基于SI的负电极的综合方法，用于切实可行的高能量LIB。在这种情况下，具有粒径为22.7μm和窄PSD的优化的SiOx / C复合电极显示出增强的循环稳定性，高容量保持超过100次循环率为84.31％。

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  • 来源
    《RSC Advances》 |2018年第16期|共8页
  • 作者

    Wu Shuaijin; Yu Bing; Wu Zhaohui; Fang Sheng; Shi Bimeng; Yang Juanyu;

  • 作者单位

    Gen Res Inst Nonferrous Met Beijing 100088 Peoples R China;

    China Automot Battery Res Inst Co Ltd Beijing 100088 Peoples R China;

    China Automot Battery Res Inst Co Ltd Beijing 100088 Peoples R China;

    China Automot Battery Res Inst Co Ltd Beijing 100088 Peoples R China;

    China Automot Battery Res Inst Co Ltd Beijing 100088 Peoples R China;

    Gen Res Inst Nonferrous Met Beijing 100088 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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