A kind of preparation method of nanometer red phosphorus and graphene composite negative electrode material

Abstract

The invention provides a preparation method for a nanometer red phosphorus and graphene composite negative electrode material. The preparation method comprises the following steps of preparing submicron red phosphorus, in which commercial red phosphorus is used as a raw material, and the submicron red phosphorus is prepared by wet grinding, dispersion and solvothermal reaction; preparing graphene oxide, in which the graphene oxide is prepared by employing an ultrasound-assisted improved Hummers method; and preparing the composite negative electrode material, in which the submicron red phosphorus is added into a graphene oxide solution, and a finished product of the nanometer red phosphorus and graphene composite negative electrode material is obtained by secondary hydrothermal reaction, filtering and drying under stirring. Submicron red phosphorus particles are prepared by the solvothermal method and are further reduced to nanoscale by secondary hydrothermal reaction, meanwhile, the graphene oxide is reduced and wraps surface of the red phosphorus, the preparation method has the advantages of moderate reaction condition, simple equipment, safety, reliability and the like, and is simple and convenient to operate, and the nanometer red phosphorus and graphene composite negative electrode material has relatively good charge-discharge cycle property and rate performance when used as a lithium / sodium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of manufacturing negative electrode materials for batteries, in particular to a method for preparing a composite negative electrode material of nanometer red phosphorus and graphene. Background technique [0002] With the depletion of oil resources, clean energy technology has attracted increasing attention. As a secondary rechargeable chemical power source, lithium-ion batteries have excellent performance, such as: high energy, low consumption, and no memory effect. The research on the lithium storage performance of lithium-ion battery anode materials is an important way to improve the performance of lithium-ion batteries. [0003] The theoretical specific capacity of elemental red phosphorus is 2596mAh / g. It is a lithium-ion negative electrode material with application potential second only to silicon in theoretical specific capacity, and has the advantages of abundant reserves, low price, and non-toxicity...

AI Technical Summary

Problems solved by technology

[0004] The particle size distribution of commercially available commercial red phosphorus is uneven. At present, the refinement of red phosphorus is mostly carried out by ball milling, which not only consumes high energy, but also takes time and trouble. The particle size of the obtained red phosphorus is at the micron level; The red phosphorus / carbon composite material has high requirements on the reaction vessel, and also has the problem of high energy consumption, and there may be conversion of red phosphorus to toxic white phosphorus

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