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Progress in Chemistry DOI: 10.7536/PC231112   

Synthesis and Modification of Single-Crystal High-Nickel Ternary Cathode Materials

Hanfeng Wu1,2, Jiushuai Deng1,*, Jinkun Wang2, Jinli Liu2,3, Yingqiang Wu2,4,*, Li Wang2, Xiangming He2,*   

  1. 1. School of Chemistry and Environment, China University of Mining and Technology-Beijing, Beijing 100083, China;
    2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
    3. School of Materials, Nanjing University of Science and Technology, Nanjing 210094, China;
    4. School of Materials, Hainan University, Haikou 570228, China
  • Received: Revised:
  • Contact: *e-mail: dengshuai689@163.com, yqwu@hainanu.edu.cn, hexm@tsinghua.edu.cn,
  • Supported by:
    National Natural Science Foundation of China (No.U21A20170). (Research on safety control of new energy vehicle power battery based on vehicle-cloud integration)
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With the rapid development of portable electronic products and electric vehicles, the demand for high energy density lithium-ion batteries is increasing. High-nickel ternary materials with nickel content higher than 0.6 (include) (e.g. LiNi0.6Co0.2Mn0.2O2, LiNi0.8Co0.1Mn0.1O2 and LiNi0.9Co0.05Mn0.05O2), which can deliver a high reversible specific capacity of more than 200 mAh g-1 at an upper cut-off voltage of 4.3 V vs. Li+/Li, are an important development direction of cathode material with high specific capacity. However, the weak mechanical strength and low compaction density of polycrystal ternary materials and the anisotropy of primary grains lead to intergranular cracks in the polycrystal particles during the charging and discharging process. The electrolyte will penetrate into the polycrystal particles along the intergranular cracks, thus aggravating the side reaction between the electrode and electrolyte and deteriorating the cycle performance and safety of the battery. The design of single crystal material without grain boundary can reduce the formation of intergranular cracks, effectively suppress the side reaction at the interfaces and improve the cycle stability. In this paper, the advantages and problems of single-crystal high-nickel ternary materials are reviewed, and their synthe-sis methods and modification strategies are analyzed. Finally, the application prospects and challenges of ingle-crystal high-nickel ternary materials are reviewed and prospected.
Key words: lithium-ion battery, high-nickel ternary cathode material, single crystal, polycrystalline

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