It is widely acknowledged that single-particle LiNiO2 represents an attractive option as a cobalt-free cathode material, given its high capacity and average working voltage. However, prolonged cell cycling has been observed to result in a decline in performance and structural deterioration in LiNiO2 cathodes. Anion doping has recently been the subject of considerable interest due to the numerous benefits it offers, including the elimination of the need for active element replacement and increased structural stability. In this study, a fluorine-doped single-particle LiNiO2 was prepared via a hydrothermal synthesis assisted by ball milling, resulting in a stable charge/discharge process at a current density of 0.2C, with a capacity retention of 90% after 60 cycles and first discharge capacity of 220 mAh.g-1. The incorporation of fluorine was confirmed through cross-sectional scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), which revealed a correlation between fluorine doping and the partial reduction of Ni3+ to Ni2+. The impact of fluorine doping on the structural stability of LiNiO2 was investigated using in-situ X-ray diffraction (XRD) and density functional theory (DFT) calculations. Consequently, the F doping strategy demonstrated the dual benefit of high capacity and cycle retention in single-particle LiNiO2 cathodes.