Ni-rich layered transition metal oxides possess remarkably high capacity and thus are very competitive cathode materials in high-energy lithium-ion batteries (LIBs) for electric vehicles, but encounter the critical problems of fast degradation caused by the highly reactive nickel component. Here in this review we intensively summarize thedegradation mechanism of Ni-rich cathode materials including e.g., residual lithium species, cation mixing, gas generation, surface structure reconstruction, crack, thermal instability, and transition metal dissolution. Furthermore, the state-of-art strategies e.g., new preparation methods, single-crystal, doping, structure design, coating and new binders, to tackle these degradation problem are accounted. This review might be inspiring for better understanding the degradation mechanism and relevant coping approaches of high-energy cathode materials for lithium ion batteries.

中文翻译：

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锂离子电池富镍层状氧化物正极的降解机制及最新进展综述

富镍层状过渡金属氧化物具有非常高的容量，因此是电动汽车高能锂离子电池（LIB）中非常有竞争力的正极材料，但遇到了由高活性镍成分引起的快速降解的关键问题。在这篇综述中，我们深入总结了富镍正极材料的降解机制，包括残留锂物种、阳离子混合、气体产生、表面结构重建、裂纹、热不稳定性和过渡金属溶解等。此外，还考虑了解决这些降解问题的最先进的策略，例如新的制备方法、单晶、掺杂、结构设计、涂层和新的粘合剂。该综述对于更好地理解锂离子电池高能正极材料的降解机制和相关应对方法可能具有启发意义。