Preparation method of lithium ion battery positive electrode composite material and precursor thereof

Abstract

The invention discloses a preparation method of a lithium ion battery positive electrode composite material and a precursor thereof, and in particular relates to a novel method for preparing a high-purity low-cost binary or ternary precursor and preparing a high-performance lithium ion battery binary or ternary positive electrode composite material by utilizing the precursor, belonging to the technical field of new energy materials and the preparation thereof. The method comprises the following specific steps: (1) putting salt-type solid raw materials of two or three of nickel, cobalt and manganese with crystal water into a reactor, and heating the materials to the molten state; (2) introducing ammonia under the protection of inert gas, supplementing a small amount of water or no water according to the solubility of salts at different temperatures, stirring and reacting; (3) evaporating ammonium salt after full reaction, taking the solid out, and drying so as to get the amorphous binary or ternary positive electrode composite material precursor; and (4) mixing the precursor with lithium carbonate according to a certain ratio, and further preparing the lithium ion battery positive electrode composite material through a two-section sintering method. The precursor synthetic method is simple, sodium hydroxide is avoided from being used, separation and purification are not required, and the high-purity positive electrode composite material precursor which has no impurities basically can be obtained; furthermore, no industrial waste water is discharged, and the by-product ammonium salt can further generate economic benefit; and the positive electrode composite material prepared by the precursor has excellent performances, and is convenient for industrialization.

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 positive 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 automotive industry, are mainly powered 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...

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Problems solved by technology

However, the cathode 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.

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