Method for preparing positive composite positive material precursor for lithium ion batteries

Abstract

The invention discloses a method for preparing a positive composite positive material precursor for lithium ion batteries, and the method is simple and convenient in technology. The method comprises the following specific steps: (1) putting any two or three salt solid raw materials of nickel, cobalt and manganese with crystal water into a reactor, and heating to a molten state; (2) introducing ammonia gas under inert gas shielding, carrying out pressurization until 1.2 to 1.4 Mpa, appropriately supplementing a small mount of water or not adding water according to the solubility of the salt atdifferent temperatures, and reacting while stirring; (3) evaporating ammonium salt after the reaction is completed, taking out a solid, and drying to obtain an amorphous binary or ternary positive composite material precursor; and (4) mixing the precursor with lithium carbonate in proportion, and carrying out a two-stage sintering process to prepare the positive composite material for lithium ionbatteries. The positive composite material prepared by the precursor is excellent in performance, 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 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...

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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.