• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Enhanced electrochemical performance and thermal stability of a CePO4-coated Li1.2Ni0.13Co0.13Mn0.54O2 cathode material for lithium-ion batteries
【24h】

Enhanced electrochemical performance and thermal stability of a CePO4-coated Li1.2Ni0.13Co0.13Mn0.54O2 cathode material for lithium-ion batteries

机译：锂离子电池用CePO4包覆的Li1.2Ni0.13Co0.13Mn0.54O2正极材料的增强的电化学性能和热稳定性

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

A layered Li1.2Ni0.13Co0.13Mn0.54O2 cathode is coated with a CePO4 layer via a simple precipitation method. The pristine and CePO4-coated Li1.2Ni0.13Co0.13Mn0.54O2 are characterized by X-ray diffraction (XRD), fieldemission scanning electron microscopy (FE-SEM), high resolution transmission electron microscope (HR-TEM) and X-ray photoelectron spectroscopy (XPS), and the results indicate that CePO4 has been uniformly coated on the Li1.2Ni0.13Co0.13Mn0.54O2. Charge-discharge tests show that the CePO4-coated Li1.2Ni0.13Co0.13Mn0.54O2 has an obviously enhanced electrochemical performance compared with the pristine sample: the initial coulombic efficiency from 88.26% to 92.19%, rate capability from 6 to 110 mA h g(-1) at 10 degrees C, high-temperature performance from 59.5 to 219.6 mA h g(-1) at 55 degrees C after 20 cycles, and low-temperature performance from 128.3 to 246.7 mA h g(-1) at -20 degrees C. According to the analysis from dc impedance and electrochemical impedance spectra, the improvements on the electrochemical performance are mainly because the coated CePO4 layer can reduce side reactions of Li1.2Ni0.13Co0.13Mn0.54O2 with the electrolyte, and thus form the cathode-electrolyte interface (CEI) layer with enhanced Li+ diffusion. In addition, the CePO4 layer significantly improves the thermal stability of the coexisting systems of the charged cathode with the electrolyte. Therefore, CePO4 coating will be a promising approach to improve the electrochemical performance and thermal stability of Li-rich layered oxide cathode materials.
机译：通过简单的沉淀方法，在层状Li1.2Ni0.13Co0.13Mn0.54O2阴极上涂覆CePO4层。原始和CePO4包覆的Li1.2Ni0.13Co0.13Mn0.54O2的特征在于X射线衍射（XRD），场发射扫描电子显微镜（FE-SEM），高分辨率透射电子显微镜（HR-TEM）和X射线光电子能谱（XPS），结果表明CePO4已均匀地涂覆在Li1.2Ni0.13Co0.13Mn0.54O2上。充放电测试表明，与原始样品相比，CePO4包覆的Li1.2Ni0.13Co0.13Mn0.54O2具有明显增强的电化学性能：初始库仑效率从88.26％到92.19％，速率能力从6到110 mA hg （-1）在10摄氏度下，经过20个循环后在55摄氏度下的高温性能为59.5至219.6 mA hg（-1），在-20摄氏度下的低温性能为128.3至246.7 mA hg（-1） C.根据直流阻抗和电化学阻抗谱的分析，电化学性能的改善主要是因为涂覆的CePO4层可以减少Li1.2Ni0.13Co0.13Mn0.54O2与电解质的副反应，从而形成阴极电解质界面（CEI）层具有增强的Li +扩散。另外，CePO 4层显着改善了带电阴极与电解质共存体系的热稳定性。因此，CePO 4涂层将是改善富锂层状氧化物阴极材料的电化学性能和热稳定性的有前途的方法。

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