Preparation method of high-capacity and high-stability lithium ion battery negative electrode material

Abstract

The invention discloses a preparation method of a high-capacity and high-stability lithium ion battery negative electrode material, which comprises the following steps: carrying out heat treatment on petroleum coke at 300-350 DEG C for 3-6 hours, then carrying out grinding treatment, and keeping the particle size of the ground powder at 5-10 microns to obtain a product for later use; s2, mixing the product in the step S1 with sodium peroxide or potassium peroxide, stirring for 0.5-2 hours at room temperature, adding distilled water, reacting for 2-4 hours, drying the solid, adding into a tubular furnace, and performing secondary heat treatment for 10-15 hours at the temperature of 700-800 DEG C under the air condition for later use; and graphitizing the product obtained in the step S2, graphitizing and calcining the product for 15-20 hours under the atmospheric condition of 2500-3000 DEG C, cooling, grinding, controlling the particle size of the product to be 3-6 microns, mixing the product meeting the particle size requirement with sodium peroxide or potassium peroxide according to the mass ratio of 1: (0.02-0.03), dropwise adding distilled water until the product is viscous, stirring, standing for 0.5-2 hours, and drying to obtain the negative electrode material.

Description

technical field

[0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials, and in particular relates to a preparation method of a high-capacity, high-stability lithium-ion battery negative electrode material. Background technique

[0002] Lithium-ion batteries have become the preferred secondary battery series for the development of the battery industry due to their high specific energy, high specific capacity, long-term cycle stability, and environmental protection. Among them, graphite, as a negative electrode material for lithium batteries, has the advantages of low production cost and good development prospects. Artificial graphite is used as a negative electrode material for lithium ion batteries, but its surface is prone to irreversible reactions with electrolytes, resulting in reduced charge and discharge efficiency, and problems caused by solvent co-intercalation. There are problems such as reduced battery reversible capa...

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