Preparation method with simple process for lithium ion battery positive electrode composite material

Abstract

The invention relates to a preparation method with a simple process for a lithium ion battery positive electrode composite material. The preparation method comprises the following steps of (1) placingarbitrary two or three of salt solid raw materials of nickel, cobalt and manganese with crystallization water in a reactor, and performing heating to a melting state; (2) introducing ammonia gas under protection of inert gas, pressurizing to 1.2-1.4MPa, appropriately supplementing a few amount of water or not adding water according to solubility of the salts under different temperatures, and performing stirring and reaction; (3) evaporating an ammonium salt after reaction is completed, taking out a solid, and drying the solid to obtain an amorphous binary or ternary positive electrode composite material precursor; and (4) mixing the precursor and lithium carbonate according to a certain proportion, wherein the lithium ion battery positive electrode composite material can be prepared by atwo-segment sintering method. The positive electrode composite material prepared from the precursor is excellent in performance, and industrialization is facilitated.

Description

technical field [0001] The present invention relates to a method for preparing lithium-ion battery cathode composite materials, in particular to a method for preparing high-purity and low-cost binary or ternary precursors, and preparing high-performance lithium-ion battery binary or ternary precursors from the precursors The method for the cathode composite material belongs to the field of new energy materials and preparation technology. Background technique [0002] In the past 10 years, lithium-ion batteries have been widely used in electronic communication fields such as mobile phones, notebook computers, and cameras, and have occupied a dominant position. New energy vehicles, which represent the development direction of the future automobile industry, are mainly driven by lithium-ion batteries. The industrialization of new energy vehicles will directly drive the rapid growth of the lithium-ion battery market. my country's automobiles are growing at a rate of 15% every y...

AI Technical Summary

Problems solved by technology

However, the positive electrode composite materials obtained by these methods have the following disadvantages: the product purity is low, especially the sodium content exceeds the standard, which seriously affects the performance of the battery; the synthesis process steps are relatively many, and the utilization rate of by-products is not high, resulting in high production costs. ; There are many industrial wastewaters in the synthesis process, or the requirements of environmental protection cannot be met, etc.