Improving the electrochemical performance of LiNi_0.5Co_0.2Mn_0.3O₂ by double-layer coating with Li₂TiO₃ for lithium-ion batteries

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• 作者：Xue-Qin Yang ; Zhong-Feng Tang ; He-Yang Wang ; Bang-Kun Zou ; Chun-Hua Chen
• 关键词：Layered nickel ; rich oxide ; Dual ; layer coating ; Li2TiO3 ; Lithium ; ion batteries
• 刊名：Ionics
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：22
• 期：11
• 页码：2235-2238
• 全文大小：1,110 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Materials Science
  Physical Chemistry
  Condensed Matter
  Renewable Energy Sources
  Electrical Power Generation and Transmission
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1862-0760
• 卷排序：22

文摘

The dual-layer Li₂TiO₃ coating of LiNi_0.5Co_0.2Mn_0.3O₂ (NCM523) compound has been successfully synthesized by a facile method for the first time. The EDS results show that the dual-layer coating is more uniform and smoother than the single-layer coating. Electrochemical tests show that the double-layer 0.5 mol % Li₂TiO₃-coated NCM can deliver an initial discharge capacity of 180 mAh g−1 at 0.1 C in the voltage range of 2.8–4.3 V, with capacity retention of 94.2 % after 80 cycles at 0.5 C, while those of the pristine one are only 172.1 mAh g−1and 87 %, respectively. The enhanced electrochemical performance is attributed to the stable dual-layer Li₂TiO₃ that serves as a 3D-diffusion pathway for Li+ ions and a protective layer that prevents side reactions between electrode and electrolyte. Thus, the double-layer coating by Li₂TiO₃ is a promising method to improve rate capability and cycle performance of NCM523.