Nickel-rich layered oxides have become the preferred cathodes for high-energy-density Li-ion batteries due to their relatively high specific capacity, further increasing the Ni content, the material properties tend to be LiNiO2, and the electrochemical and structural stability deteriorate. Lattice element doping is an effective strategy to improve the stability of LiNiO2. Clarifying the structure of LiNiO2 cathode material and clarifying the influence and regularity of doping elements on it is of great significance for the development of nickel-rich cathode materials with Ni content greater than 90%. In this paper, the structure of LiNiO2 material and the stability problems it faces are firstly introduced. Then, the influences and laws of typical doping elements such as Co, Mn, Al, Mg, Ti, Zr, and W on LiNiO2 are reviewed, and anionic and multi-element doping and potential doping elements are discussed. This paper aims to provide a new perspective on LiNiO2 doping with a view to developing high-capacity stable Ni-rich cathode materials for power batteries using more efficient doping schemes.