LAUSR

With the rapid development of electric vehicles, Ni-based cathodes attract increasing attention as used in power batteries due to their high capacity and low cost. However, Ni-based cathodes are faced with several problems, such as Li/Ni disorder, cycle capacity degrading, poor storage in air, and thermal instability. This review carefully compared the structure difference between LiNiO2 and LiCoO2 and concluded that the electronic structure of Ni3+ determined the instability of LiNiO2. The degrading mechanism during long cycle was discussed in the second part and it could be attributed to the surface properties. Moisture sensitive severely restricts the application of Ni-based cathodes due to the gelation in slurry making and gas released in batteries. Some possible mechanisms proposed by previous researchers were reviewed in the third part and a new interpretation on the basis of diffusion was also suggested. Lastly, the nature of thermal instability of Ni-based cathodes was presented.