High storage performance of core–shell Si@C nanoparticles as lithium ion battery anodematerial
High storage performance of core–shell Si@C nanoparticles as lithium ion battery anodematerial
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DOI：
10.1016/j.matlet.2013.01.073
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发表时间：
2013-04
影响因子：
3
通讯作者：
Guangyu Zhao;Li Zhang;Y. Meng;Naiqing Zhang;Kening Sun
中科院分区：
文献类型：
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作者：
Guangyu Zhao;Li Zhang;Y. Meng;Naiqing Zhang;Kening Sun
通过对有机前驱体修饰的Si纳米晶进行热处理，成功地获得了核壳结构的Si@C纳米粒子。通过化学反应修饰有机前驱体的方法是可控的，使得包覆在硅纳米颗粒上的碳壳均匀超薄。这种超薄的碳壳有效地缓解了复合材料中碳含量较低的纳米硅颗粒的容量衰减。电化学测试表明，核壳结构的Si@C纳米粒子作为含电解液的碳酸亚乙酯锂离子电池负极材料循环性能稳定，50次充放电后容量仍保持1700mAhg−1。
Core–shell Si@C nanoparticles have been obtained by heat treating the organic precursor decorated Si crystalline nanoparticles successfully. The method of decorating organic precursor by the chemical reaction is so controllable that the coated carbon shell on the Si nanoparticles is uniformly ultrathin. This ultrathin carbon shell realizes effective relief to the capacity fading of Si nanoparticles with low carbon content in the composite. Electrochemical measurements demonstrate that the core–shell Si@C nanoparticles behave a so stable cycle performance as anode material of lithium ion batteries with a vinylene carbonate containing electrolyte, that the capacity still remains 1700mAhg−1after 50 cycle charge/discharge.