• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >Hierarchical LiFePO _4/C microspheres with high tap density assembled by nanosheets as cathode materials for high-performance Li-ion batteries
【24h】

Hierarchical LiFePO _4/C microspheres with high tap density assembled by nanosheets as cathode materials for high-performance Li-ion batteries

机译：纳米片组装的高抽头密度分层LiFePO _4 / C微球作为高性能锂离子电池的阴极材料

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

In this paper, LiFePO 4/C microspheres consisting of closely packed nanosheets have been synthesized via a simple solvothermal method and a subsequent carbon coating procedure. In order to clarify the microstructure of the product, the as-prepared composite has been characterized by various techniques, such as powder x-ray diffraction, scanning electron microscopy, energy dispersive spectrum, Raman spectroscopy and high-resolution transmission microscopy. Results show that the LiFePO 4/C microspheres are uniform with a particle size of 8-10μm. The microspheres are composed of densely compacted nanosheets with a thickness of 20-30nm. The gaps between the nanosheets are estimated to be 10-50nm; a carbon layer with a thickness of 4nm is coated on the surface of the LiFePO 4 spheres. The tap density of the LiFePO 4/C composite reaches up to 1.5gcm 3. As cathode material for Li-ion batteries, the composite exhibits a high capacity: 155mAhg 1, 144mAhg 1, 129mAhg 1, and 104mAhg 1 at 0.1C, 1C, 5C and 10C, respectively. Furthermore, the material also shows good cycling stability at both low and high current rates. The unique nanostructure of the material promises its excellent electrochemical properties as a cathode material for lithium batteries.
机译：在本文中，已经通过简单的溶剂热法和随后的碳涂覆程序合成了由紧密堆积的纳米片组成的LiFePO 4 / C微球。为了阐明产品的微观结构，已制备的复合材料已通过多种技术进行了表征，例如粉末X射线衍射，扫描电子显微镜，能量色散谱，拉曼光谱和高分辨率透射显微镜。结果表明，LiFePO 4 / C微球是均匀的，粒径为8-10μm。微球由紧密致密的纳米片构成，其厚度为20-30nm。纳米片之间的间隙估计为10-50nm。在LiFePO 4球的表面上涂覆厚度为4nm的碳层。 LiFePO 4 / C复合材料的振实密度达到1.5gcm3。作为锂离子电池的正极材料，该复合材料表现出高容量：在0.1C，1C时为155mAhg 1、144mAhg 1、129mAhg 1和104mAhg 1。 ，5C和10C。此外，该材料在低电流速率和高电流速率下也显示出良好的循环稳定性。该材料独特的纳米结构使其具有出色的电化学性能，可作为锂电池的正极材料。

著录项

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