▎ 摘　　要

NOVELTY - Preparing black phosphorus-carbon composite material, comprises (a) ball milling the amorphous red phosphorus and the conductive carbon material under a protective atmosphere to obtain a red phosphorus-carbon material mixed raw material; (b) compressing the obtained red phosphorus-carbon material mixed raw material, and placing the obtained block sample into a high-temperature and high-pressure assembly; (c) placing the sample assembly into a high-temperature and high-pressure device to perform a high-temperature and high-pressure reaction, and taking out the sample after lowering the temperature and pressure to obtain the black phosphorus-carbon composite material. USE - The black phosphorus-carbon composite material is useful in field of lithium/sodium ion battery (claimed). ADVANTAGE - The method has high black phosphorus crystallinity, and relatively high covalent PC bond content, is beneficial to inhibit the volume expansion of black phosphorus during charging and discharging of lithium/sodium ion battery, maintains stable charge-discharge cycle performance, is simple and economical, and has controllable synthesis reaction, which is suitable for popularization and application. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for black phosphorus-carbon composite material, prepared as mentioned above.