Enhancing electrochemical performance of fluorinated graphite by polydopamine−derived nitrogen−doped carbon coating

The poor electronic conductivity of fluorinated graphite (CF x ) is one of the key problems limiting its electrochemical performance. Herein, polydopamine−derived nitrogen−doped carbon coating is adapted to improve the electrochemical performance of CF x by modifying its electronic conductivity. The effects of dopamine hydrochloride/CF x ratio and the carbonization temperature on the electrochemical performance of nitrogen−doped carbon coated CF x samples (CF x @NC−x−y) cathodes are investigated. CF x @NC−x−y cathodes present enhanced rate performance and discharge plateau, and increased energy and power densities, compared with the pristine CF x . Particularly, the CF x @NC−3−350 achieves optimized electrochemical performance, such as a discharge capacity of 550.5 mAh g −1 with a plateau of 2.18 V at 2000 mA g −1 , corresponding to high power and energy densities of 4360 W kg −1 and 1171.2 Wh kg −1 , whereas the pristine CF x is unable to work. The enhanced electrochemical performance is contributed to the improved electronic conductivity of the nitrogen−doped carbon−coated CF x .