Lithium ion battery anode material with porous structure and preparation method of lithium ion battery anode material

Abstract

The invention discloses a lithium ion battery anode material with a porous structure and a preparation method of the lithium ion battery anode material. The raw material is spherical flake graphite and a coating precursor. The preparation method is characterized by comprising the following steps: by the pore-forming action of pore-forming agents, such as silicon oxide, calcium oxide, magnesium oxide, ferroferric oxide, copper oxide and molybdenum oxide, naturally existing in the spherical flake graphite in a high-temperature treatment process, preparing high-purity spherical graphite with a certain pore structure; and carrying out surface coating with resin materials such as asphalt, emulsified asphalt, phenolic resin, furfural resin and epoxy resin, and carrying out carbonization, crushing and screening to obtain the final anode material. Compared with a traditional technology, the anode material prepared by the method has the advantages of high capacity, good cycling stability and the like; the raw materials used by the technology are abundant; the preparation technology is simple; and the lithium ion battery anode material is suitable for large-scale production and has great commercial value.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for lithium ion batteries, in particular to a negative electrode material for lithium ion batteries prepared by modification of natural spherical flake graphite and a preparation method thereof. Background technique [0002] Since Sony first launched lithium-ion batteries on the market in 1990, lithium-ion batteries have unique advantages compared with nickel-hydrogen nickel-cadmium rechargeable batteries, such as high specific energy, high operating voltage, long charge and discharge life, No memory effect, less environmental pollution, low self-discharge rate, etc., quickly occupied the market of commercial rechargeable batteries, especially as the power supply of small portable electrical appliances such as mobile phones, notebook computers, and digital cameras. In recent years, the research and application of positive and negative electrode materials and electrolyte s...

AI Technical Summary

Problems solved by technology

The flake graphite sheet structure is relatively regular, which is conducive to the insertion and extraction of lithium ions, and the reversible capacity can reach 300~350mAh / g. However, due to the expansion and contraction of the charge and discharge process between the sheets is unidirectional, it is easy to cause sheets. The shedding will affect the cycle stability

[0005] At present, the further application of natural graphite is mainly affected by the poor high-current charge-discharge performance and cycle stability of natural graphite.