Preparation method of hard carbon material for lithium ion battery negative electrode

• Main Author: YU BINGWU
• Format: Patent
• Language: Chinese; English
• Published: 19.10.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to a preparation method of a hard carbon material for a lithium ion battery negative electrode. The method comprises the following steps of dissolving purified and pre-oxidized coal asphalt into a special solvent with the temperature being 80 DEG C or more; mixing biomass polyhydroxy alcohols in the asphalt solution; feeding the materials into a ball mill; performing stirring, pyrolysis and compounding; performing wet process ball milling crushing in the ball mill; performing centrifugation on suspension to obtain solid-containing slurry; putting the solid-containing slurry into a low-temperature carbonization furnace for pre-carbonization; performing crushing and sieving on the powder particles; putting the materials into a nitrogen atmosphere carbonization furnace;maintaining the state for a period of time at 1100 to 1200 DEG C to obtain the hard carbon material for the lithium ion battery negative electrode. The main processes are performed in a liquid phase;the environment is sealed;