Preparation method of graphene-multi-element metal positive electrode material

Abstract

The invention relates to a preparation method of a graphene-multi-element metal positive electrode material. The method comprises the following steps: (1) weighing lithium hydroxide, magnesium oxide, manganese oxide, aluminium hydroxide, cobaltous oxide and zirconia according to the molar weights of Li, Mg, Mn, Al, Co and Zr in the chemical formula of Li(1-x)MgxMn(1-y)AlyCo(1-z)ZrzO4, wherein x is equal to 0.2-0.25, y is equal to 0.1-0.3, and z is equal to 0.05-0.1, mechanically mixing, carrying out ball milling, and drying so as to obtain powder, crushing, and sintering so as to obtain the multi-element metal positive electrode material; (2) preparing powdery graphene; and (3) mixing the powdery graphene and a polyethylene glycol solution, ultrasonically dispersing the mixture into ethyl alcohol to form a conductive graphene dispersive liquid; mixing the multi-element metal positive electrode material with the conductive graphene dispersive liquid, carrying out ball milling, drying, and sintering so as to prepare the graphene-multi-element metal positive electrode material. According to the graphene-multi-element metal positive electrode material prepared by the invention, active substances are formed by utilizing the multi-element metal material, and the surface of the graphene-multi-element metal positive electrode material is coated with a graphene material prepared by a specific method, and the activity and the stability of the material are improved.

Description

Technical field [0001] The invention relates to a preparation method of a graphene-multiple metal cathode material. Background technique [0002] With the rapid development of the battery industry, in order to solve many problems such as battery life, energy density, self-discharge or quality, various types of batteries have emerged. At present, due to the advantages of high energy density, long service life, light weight, and small self-discharge, lithium batteries have become the preferred power source for portable devices such as communication equipment and notebook computers, and have also begun to be applied to electric vehicles, national defense, etc. in large equipment. In order to achieve higher energy density of the above-mentioned battery, it is necessary to use a material with high energy density as the positive electrode active material. Therefore, it has been proposed to use a composite oxide in which a transition metal represented by cobalt and nickel is soli...

AI Technical Summary

Problems solved by technology

Li-Mn-O and Li-Ni-Co-O materials are slightly better than Li-Co-O when they are overcharged, but the Mn or Ni ions produced have a strong catalytic effect, which accelerates the decomposition of the electrolyte and also leads to The above results