▎ 摘　　要

NOVELTY - Preparing hard carbon material involves placing raw materials of precursor A and heating to obtain liquid slurry; spray-drying liquid slurry to obtain precursor A, where raw materials of precursor A includes carbon source, organic solvent and crosslinking agent, and temperature of spray drying is 80-150 degrees C; curing precursor A to obtain precursor B', where curing treatment includes temperature of first-stage heat treatment of 150-350 degrees C, temperature of second level heat treatment of 360-420 degrees C, temperature of third level heat treatment of 450-650 degrees C; and carbonizing precursor B'. USE - Method for preparing hard carbon material used as negative electrode in lithium ion battery or supercapacitor, where supercapacitor is asymmetric supercapacitor (all claimed). ADVANTAGE - The method enables to prepare hard carbon material, which has stable quality, reasonable pore structure, low resistivity, and is convenient for insertion and extraction of lithium ions; has high reversible capacity, good high-current performance, and excellent cycle performance; provides high first discharge efficiency, where preparation method is simple, process flow is consistent, and is suitable for industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a hard carbon material, which has particle size D50, which is 5-30 mu m, preferably 6-20 mu m, more preferably 8-16 mu m; and specific surface area of 3-10 m2/g, preferably 3-8 m2/g, more preferably 3-7 m2/g.