▎ 摘　　要

NOVELTY - Production of in-situ three-dimensional porous carbon skeleton/graphene composite material comprises soaking thin-walled plant skin in sulfuric acid to obtain suspension, washing with distilled water until pH is 7, and filtering to obtain first solution; mixing sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate and/or potassium bicarbonate at mass ratio of 1:9-9:1 to second solution; and mixing two solutions at mass of 1:3-3:1 under argon atmosphere, calcining to 500-1300 degrees C for 0.5-3 hours, washing until pH is 7, filtering, and drying. USE - Method for production of in-situ three-dimensional porous carbon skeleton/graphene composite material (claimed) used for sodium ion battery. ADVANTAGE - The composite material contains graphene structure that promotes the conductivity of carbon material, improves cycling performance and rate performance of sodium ion battery, and has multi-level distribution aperture which facilitates the insertion and removal of sodium ions to provide more storage space, and increased specific surface area.