抑制富镍正极材料微裂纹产生的研究进展

Progress of suppressing formation of microcracks in Ni-rich cathode materials

富镍正极材料因具有能量密度高、成本低等优点而备受关注。但其较差的结构稳定性导致循环性能不理想,极大地限制了该类材料在锂离子电池中的广泛应用。讨论了微裂纹的产生原因及微裂纹对富镍正极材料电化学性能的影响,综述了抑制微裂纹产生的改进措施,并对富镍正极材料的进一步改性作了展望。

Ni-rich cathode materials have attracted attention because of their high energy density, low cost and environmental friendliness. However, the poor structural stability of Ni-rich materials leads to the rapid decline of capacity, greatly limiting the widespread use of such materials in lithium-ion batteries. The mechanism of microcracks in Ni-rich materials and its effect on electrochemical properties were discussed. The improvement measures to suppress the generation of microcracks were reviewed, and the further modification of Ni-rich cathode materials was discussed.