In-situ metallic Ag-doping of CFx cathode: An efficient strategy to solve the problems of high resistivity and unavoidable polarization

Li/CF x batteries are used in a wide range of applications thanks to their high theoretical specific energy of up to 2180 mWh/g. However, the high resistivity and unavoidable polarization of the CF x material itself result in low Li-ion migration rates and rate performance. Here, a simple strategy is developed to enhance the rate performances of Li/CF x batteries without sacrificing the specific capacity by in-situ reduction of Ag + ions in ultrafine CF x by UV illumination. The deposited Ag particles provided an efficient pathway for rapid electron transport facilitating Li + diffusion throughout the fabricated electrodes. The optimal CF x @Ag can still achieve a specific energy of discharge of 1645 mWh/g and a specific capacity of 745 mAh/g at a high rate (1 C). This UV deposition technique creates a novel technology. This technique effectively improves the mass transfer efficiency of lithium ions and electrons, pulse resistance, and reduces the internal resistance of Li/CF x batteries.