Method for preparing lithium ion battery negative electrode composite material

Abstract

The invention discloses a method for preparing a lithium ion battery negative electrode composite material. The method comprises the following steps: uniformly mixing epoxy resin, polycarbonate, butylene succinate, isocyanate and ethyl acetate by stirring, and feeding the mixture into a carbonization furnace for carbonization to obtain a carbonized material I; soaking the carbonized material I with a 1 percent hydrochloric acid solution, filtering the soaked carbonized material I to obtain a solid mixture, flushing the solid mixture with deionized water to neutral, and performing filtering, drying and grinding on the flushed solid mixture to obtain a carbonized material II; adding the carbonized material II, graphene, methylphenyldiaryl silane and dioctyl phthalate into a reaction kettle, heating the materials in the reaction kettle to perform a reaction, and adding ammonium persulfate to obtain an intermediate material; and drying the intermediate material, and grinding the dried intermediate material to obtain the lithium ion battery negative electrode composite material. The lithium ion battery negative electrode composite material prepared by the method has high discharging capacity and high discharging efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode material preparation, and in particular relates to a preparation method of a lithium-ion battery negative electrode composite material. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on lithium ions to move between positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. The development of lithium-ion batteries originated in the 1990s, and it has only been 20 years. In the past 20 years, the lithium battery industry has made a leap. With the emphasis on the environment and new en...

AI Technical Summary

Problems solved by technology

The graphite materials currently used as lithium-ion electrode materials limit the free diffusion of lithium ions in the graphite structure, which restricts the development of the electrochemical capacity of graphite negative electrodes.

These problems make it difficult for simple carbon anode materials to meet the requirements of high-performance lithium-ion batteries for electronic devices, electric vehicles, etc.