Na₃V₂(PO₄)₂F₃/C composites were synthesized by a solid-state reaction method using pitch as the carbon source, the as-prepared sample with the carbon content of 12.14% possesses an excellent rate performance and cycle stability.

The synergistic effect of Ce ³⁺ doping in crystal framework and CeO ₂ surface coating was achieved simultaneously, which greatly improved the electronic conductivity, facilitated the ion diffusion transfer and stabilized the crystalline structure.

Inferior cycling stability at elevated temperature is a big challenge for the commercial application of nickel-rich cathode materials because more serious phase transition, transition metal ion dissolution and side reaction of interface happen at elevated temperature than at room temperature. In the present work, strategies of element doping and surface coating are utilized together to stabilize the structure and interface electrochemistry. We successfully synthesized a Zr-doped and LiAlO₂-Al₂O₃ coated LiNi_0.8Co_0.1Mn_0.1O₂ material by a simple ball milling and wet chemical method. Owing to the synergistic effect of Zr doping and dual LiAlO₂-Al₂O₃ coating, when cycled at 50°C, the modified LiNi_0.8Co_0.1Mn_0.1O₂ sample exhibited significantly improved cycling stability with a capacity retention of over 96.8% after 60 cycles at a current rate of 1C, while the pristine sample could only retain a capacity of 73.3%. This improved electrochemical performance can be attributed to the effective doping and coating technique employed to the LiNi_0.8Co_0.1Mn_0.1O₂ sample. The Zr doping is beneficial to reduce cation mixing and suppress the phase transition, while the LiAlO₂-Al₂O₃ coating helps to enhance the protection of the electrode/electrolyte interface and reduce the transition metal ion dissolution.