Journal of Inorganic Materials ›› 2022, Vol. 37 ›› Issue (9): 1030-1036.DOI: 10.15541/jim20210769

• RESEARCH ARTICLE • Previous Articles    

Enhanced Lithium Storage Stability Mechanism of Ultra-high Nickel LiNi0.91Co0.06Al0.03O2@Ca3(PO4)2 Cathode Materials

ZHU Hezhen1(), WANG Xuanpeng2,3(), HAN Kang1, YANG Chen1, WAN Ruizhe2, WU Liming1, MAI Liqiang1,3()   

  1. 1. School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
    2. School of Science, Wuhan University of Technology, Wuhan 430070, China
    3. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Foshan 528200, China
  • Received:2021-12-17 Revised:2022-02-26 Published:2022-09-20 Online:2022-03-10
  • Contact: WANG Xuanpeng, lecturer. E-mail: wxp122525691@whut.edu.cn;
    MAI Liqiang, professor. E-mail: mlq518@whut.edu.cn
  • About author:ZHU Hezhen (1995-), male, Master candidate. E-mail: 290761@whut.edu.cn
  • Supported by:
    National Key Research and Development Program of China(2020YFA0715000);National Natural Science Foundation of China(51832004);National Natural Science Foundation of China(21905218);Independent Innovation Research Fund Project of Wuhan University of Technology WUT:2021-LX-B1-04

Abstract:

Ultra-high nickel material as a new lithium-ion battery cathode has attracted much attention due to its high specific capacity, high voltage and low cost. However, the generated microcracks, mechanical pulverization and irreversible phase transformation during cycling, result in poor cycling stability. Herein, a series of Ca3(PO4)2- coated ultra-high nickel LiNi0.91Co0.06Al0.03O2 materials with different thicknesses (NCA@nCP) were prepared through a facile wet-chemistry strategy. Among them, NCA@1CP manifested specific discharge capacity of 204.8 mAh/g under 2.7-4.3 V at 1C (1C=200 mA/g), with a capacity retention rate of 91.5% after 100 cycles. Even after 300 cycles at 2C, the specific discharge capacity retained 153.4 mAh/g. Material characterization results further confirm that the coating shell inhibits the Li/Ni mixing, irreversible phase transformation and mechanical pulverization of the NCA@1CP, greatly improving the cycling stability. This work shows that the Ca3(PO4)2 coating strategy has great application potential in improving the lithium storage stability of ultra-high nickel cathode materials.

Key words: lithium-ion battery, ultra-high nickel cathode, Ca3(PO4)2, surface coating

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