• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Walnut-structure Si-G/C materials with high coulombic efficiency for long-life lithium ion batteries
【24h】

Walnut-structure Si-G/C materials with high coulombic efficiency for long-life lithium ion batteries

机译：核桃 - 结构Si-G / C材料具有高寿命锂离子电池的高库仑效率

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Nano-sized silicon is a potential high energy density anode material for lithium ion batteries. However, the practical use of a nano-Si anode is still challenging due to its low coulombic efficiency, poor scalability and cycling stability. Herein, a Si/graphite/carbon (Si-G/C) composite with a core-shell structure was fabricated by a facile two-step chemical process, stirring-evaporating followed by heat treatment. The composite structure consists of a graphite core, coated first by silicon and then amorphous carbon, which was decomposed by pitch. The as-prepared Si-G/C composite anode demonstrates a first cycle capacity of about 650 mA h g(-1), over 90% coulombic efficiency, and high capacity retention of 96.7% after 50 cycles. When paired with a commercial NCA cathode, superior cycling stability with more than 81% capacity retention was achieved for 1200 cycles. These results demonstrate that such a core-shell Si-G/C composite is a promising anode material for high energy Li-ion batteries.
机译：纳米尺寸的硅是用于锂离子电池的电势高的能量密度的阳极材料。然而，纳米硅阳极的实际使用，由于仍然是具有挑战性的低充放电效率，可扩展性差和循环稳定性。在此，在Si /石墨/碳（SI-G / C）复合材料的核 - 壳结构由一个浅显两步化学工艺制造，搅拌 - 蒸发随后进行热处理。该复合结构由石墨芯，由硅，然后无定形碳首先涂布，将其通过音调分解的。所制备的Si-G / C复合负极演示约650毫安ħ克（-1），超过90％的库仑效率50次循环后的第一次循环容量，和96.7％的高容量保持率。当用市售NCA阴极配对，有超过81％的容量保持率优异的循环稳定性为1200个周期来实现的。这些结果表明，这种芯 - 壳的Si-G / C复合材料为高能量锂离子电池有前途的阳极材料。

著录项

  • 来源
    《RSC Advances》 |2018年第48期|共7页
  • 作者

    Xiao Chengmao; He Peng; Ren Jianguo; Yue Min; Huang Youyuan; He Xueqin;

  • 作者单位

    BTR New Energy Mat Inc Shenzhen 518106 Peoples R China;

    BTR New Energy Mat Inc Shenzhen 518106 Peoples R China;

    BTR New Energy Mat Inc Shenzhen 518106 Peoples R China;

    BTR New Energy Mat Inc Shenzhen 518106 Peoples R China;

    BTR New Energy Mat Inc Shenzhen 518106 Peoples R China;

    BTR New Energy Mat Inc Shenzhen 518106 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号