Method for preparing nickel cobalt lithium manganate ternary system anode material of lithium ion battery

Abstract

The invention discloses a method for preparing a nickel cobalt lithium manganate ternary system anode material of a lithium ion battery. Sulfates of Ni, Co and Mn are used as raw materials. The method comprises the following steps of: dissolving the three sulfates into water in a certain molar ratio to form solution, then evaporating the solution with stirring, heating and decomposing the powder obtained by evaporating to obtain LiNi1-x-yCoxMnyO2 precursor composite oxide, then mixing the precursor composite oxide and lithium carbonate or lithium hydrate in a certain molar ratio, and heating the mixture at a high temperature to obtain LiNi1-x-yCoxMnyO2. The method overcomes the defect that Li+ is difficultly mixed with Co2+, Ni2+ and Mn2+ uniformly in a solid phase method, and meanwhile avoids the disadvantages of harsh condition control requirements such as pH of the solution, concentration, temperature, stirring speed and the like in a co-precipitation method during preparing the precursor. The gas generated by high-temperature heating is absorbed by using mixed slurry of manganese dioxide and manganese carbonate so as to obtain manganese sulfate serving as one of synthesis raw materials.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery nickel-cobalt-lithium manganate ternary positive electrode material. Background technique [0002] With the rapid development of miniaturization and light weight of electronic instruments, people have higher and higher requirements for chemical power sources used in electronic instruments, which has led to unprecedented development of batteries with high energy density. Compared with other traditional secondary batteries, lithium-ion batteries have the advantages of high voltage, high energy density, long cycle life, low self-discharge, and no memory effect, so they have been rapidly developed and widely used. [0003] LiCoO 2 As a cathode material for lithium-ion batteries, it has been commercially produced for many years, but due to the scarcity of Co resources, its cost is much higher than that of the anode, accounting for more than one-third of the total cost of the battery, ma...

AI Technical Summary

Problems solved by technology

Due to the difficulty of making Li + with Co 2+ 、Ni 2+ , Mn 2+ Uniform mixing, so high calcination temperature (above 800°C) and long time (above 24h) are required, but if the calcination temperature is too high, it is easy to make Ni 2+ Occupy Li + In the 3a position, cation mixing occurs, which makes it difficult to increase the capacity of the target material and decrease the cycle stability.