Abstract:  MnO_x-doped polyvinyl alcohol (PVA)-based carbon-coated CF_x was used to modify the fluorinated carbon. We investigated the appropriate carbonisation and oxidation temperatures and the thickness of the MnO_x-doped PVA-based carbon coating layer to improve the discharge rate performance of lithium-fluorinated carbon batteries and optimise the fluorinated carbon coating layer. The experimental results show that a highly conductive carbon layer is obtained by the optimised carbonization temperature, and pure crystallised manganese oxide is obtained by optimising the oxidation temperature. The coating thickness is adjusted by optimising the concentrations of PVA and Mn(NO₃)₂ to improve the fluorocarbon interface and promote the diffusion of lithium ions to the fluorocarbon electrode. Based on the micromorphology characterisation and electrochemical performance analysis of different combinations, CF_0.79@C-MnO_x-350 ◦C argon-400 ◦C oxygen-0.25 mol/L Mn(NO₃)₂-0.25 mol/L PVA exhibits the best electrochemical performance with a high discharge rate. Both its discharge rate performance and voltage platform are superior to the original fluorinated carbon and other MnO_x-doped PVA-based carboncoated fluorinated carbon materials with other combination mechanisms. 

Key words: lithium-?uorine carbon battery, MnO_x, polyvinyl alcohol (PVA), carbonisation temperature, oxidation temperature, coating layer thickness