▎ 摘　　要

NOVELTY - Preparing gallium nitride (GaN) porous micro-square/carbon composite material comprises (i) taking a specific amount gallium nitrate, hexamethylenetetramine, D-glucose and graphene oxide, adding deionized water, and stirring until uniformly dispersed to obtain a suspension, (ii) transferring the suspension to the lining of the hydrothermal reactor, hydrothermally reacting at 120-180 degrees C for 12-36 hours, and naturally cooling to room temperature, and (iii) freeze-drying the obtained product and annealing under ammonia atmosphere to obtain the finished product. USE - The composite material is useful as cathode of lithium ion battery. ADVANTAGE - The composite material: shows excellent electrochemical performance.