Enhanced cycling stability and rate performance of Co-doped and La2O3-coated LiNi0.9Mn0.1O2 toward power battery

作者：Peng, Jia-Qi; Wei, Yuan-Yuan; Liu, Dong-Ming; Li, Yun; Hu, Bin; Huang, Bin; Yang, Jian-Wen; Xiao, Shun-Hua^*; Wang, Ren-Heng^*

来源：RARE METALS, 2024, 43(2): 658-670.

DOI：10.1007/s12598-023-02470-2

• High nickel cathode material
• Co doping
• La2O3 coating
• Electrochemical performance
• Electrochemical mechanism

Ultra-high nickel layered oxide cathode material with high energy density is the most promising material to improve the electrochemical performance of lithium-ion batteries (LIBs). However, the poor structural stability and severe surface/interface side reactions of the material lead to poor rate performance and cyclic stability, which limits its application in practice. In this paper, the dual-modification strategy of Co doping and La2O3 coating is used to meet the above challenges. Co doping can effectively widen layer spacing and reduce Li+/Ni2+ mixing, and La2O3 coating can effectively eliminate the residual alkali on the surface of active material, inhibit the thickening of cathode electrolyte interphase (CEI) film and reduce surface/interface side reactions. Therefore, the modified material (NM90-CL) with excellent electrochemical properties is achieved through the synergistic enhancement of Co doping and La2O3 coating. Its capacity retention rate can reach 77.9% after 200 cycles at 1.0 degrees C and 75.7% after 200 cycles at 5.0 degrees C. Its reversible capacity can up to 153.5 mAh<middle dot>g(-1) at 10.0 degrees C. This dual-modification strategy will provide theoretical guidance and technical support for the synthesis of other high-performance electrode materials.

• 单位
  桂林理工大学