▎ 摘　　要

NOVELTY - Preparing low self-discharge lithium battery cathode material comprises e.g. (i) taking graphene, conductive carbon black, lithium iron phosphate, nano-silica powder, barium titanate powder, polyacrylonitrile and nano-aqueous adhesive; (ii) mixing graphene, conductive carbon black, lithium iron phosphate, nano-silica powder, barium titanate powder and nano water-based adhesive in medium speed mixer, mixing, melt processing mixed materials, extruding and grinding the extruded mixed material; (iii) adding the mixed powder into an ultrasonic dispersing machine for ultrasonic dispersion treatment, cooling and drying; (iv) calcining prepared mixture in a calcining apparatus to obtain graphene, conductive carbon black, lithium iron phosphate, nano silicon powder, barium titanate powder and cyclized polyacrylonitrile complex; and (v) cooling complex, charging complex into a mold and pressing on a hydraulic machine. USE - The method is useful for preparing low self-discharge lithium battery cathode material. ADVANTAGE - The method: improves stability and reduces the self-discharge effect of cathode material. DETAILED DESCRIPTION - Preparing low self-discharge lithium battery cathode material comprises (i) taking 50-70 pts. wt. graphene, 15-25 pts. wt. conductive carbon black, 90-100 pts. wt. lithium iron phosphate, 60-75 pts. wt. nano-silica powder, 10-20 pts. wt. barium titanate powder, 20-35 pts. wt. polyacrylonitrile and 10-15 pts. wt. nano-aqueous adhesive; (ii) mixing graphene, conductive carbon black, lithium iron phosphate, nano-silica powder, barium titanate powder and nano water-based adhesive in medium speed mixer, mixing for 20-30 minutes, melt processing mixed materials, extruding in twin-screw extruder and grinding the extruded mixed material to prepare a mixed powder; (iii) adding the mixed powder prepared by polyacrylonitrile into an ultrasonic dispersing machine for ultrasonic dispersion treatment for 20-25 minutes, cooling and drying to obtain graphene, conductive carbon black, lithium iron phosphate, nano silicon powder, barium titanate powder and polyacrylonitrile; (iv) calcining prepared mixture in a calcining apparatus at 810-870 degrees C for 7-12 hours to obtain graphene, conductive carbon black, lithium iron phosphate, nano silicon powder, barium titanate powder and cyclized polyacrylonitrile complex; and (v) cooling complex, charging complex into a mold and pressing on a hydraulic machine to obtain graphene, conductive carbon black, lithium iron phosphate, nano silicon powder, barium titanate powder and cyclized polyacrylonitrile.