Ni-rich transition metal layered oxides as one of the most promising cathodes for Li-ion batteries possess discernible advantages such as high energy density and discharge capacity. Despite their superiority, Ni-rich cathodes suffer from severe microcracks within the secondary particles, particularly when the nickel content exceeds 80%, which causes liquid electrolyte penetrates the interior of secondary particles and reacts with more active materials, leading to rapid degradation of cell performance. Therefore, increasing researches focus on understanding the causes of microcracks generation and overcoming particle cracking. Herein, the intrinsic origins of microcracks in Ni-rich cathodes, together with effective modification strategies for suppressing the nucleation and propagation of microcracks are reviewed.

富镍过渡金属层状氧化物作为锂离子电池最有前途的正极之一，具有高能量密度和放电容量等明显优势。尽管具有优越性，但富镍正极在二次粒子内部存在严重的微裂纹，特别是当镍含量超过 80% 时，这会导致液体电解质渗透二次粒子内部并与更多活性材料发生反应，导致电池性能迅速下降. 因此，越来越多的研究集中在了解微裂纹产生的原因和克服颗粒裂纹上。本文综述了富镍正极中微裂纹的内在起源，以及抑制微裂纹成核和传播的有效改性策略。