Method for preparing positive electrode material of Li-ion battery using impact-flow equipment

Abstract

The invention discloses a method which utilizes impinging stream equipment to prepare lithium ion battery anode materials. The method comprises the following steps: hydroxides or soluble salts of Li and soluble salts of transition metals are respectively dissolved into deionized water to form solutions, then the two solutions are impinged with each other in the impinging stream equipment at a speed of 2 m / s-30 m / s and react with each other, a sediment produced by the reaction is moved into a high temperature furnace after being washed and dried, calcined for 3h-15h at 300 DEG C-700 DEG C and then cooled down, finally a Li-ion battery anode material is obtained. The method provided by the invention has simple process, the reaction time can be effectively shortened and the production efficiency can be improved; the Li-ion battery anode material obtained by adopting the method has even grains, small grain size and high electrochemistry capacity.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a method for preparing a positive electrode material of a lithium ion battery by using impinging flow equipment. Background technique [0002] Lithium-ion batteries were first introduced by SONY in 1991. Up to now, lithium-ion batteries have provided power for many electrical equipment, including mobile phones, notebook computers and other portable electrical equipment, most of which use lithium-ion batteries as power supplies. And its demand is getting wider and wider. At present, lithium-ion batteries have entered the field of electric vehicles and hybrid vehicles. [0003] At present, the preparation methods of cathode materials for lithium-ion batteries mainly include solid-phase synthesis and liquid-phase synthesis. Among the liquid-phase synthesis methods, the most widely used method is the co-precipitation method. The advan...

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Problems solved by technology

[0004] (1) Low reaction efficiency and long reaction cycle

[0005] In the co-precipitation method, the preparation of the precursor is usually stirred and mixed with a stirring paddle, and the reaction efficiency is low. Generally, it needs to be stirred for 5 to 15 hours, and the reaction cycle is long.

[0006] (2) The electrochemical capacity of the product is low

In recent years, people have begun to use this characteristic to produce ultra-fine powder through chemical reactions. For example, the patent application No. 200410072307.9 discloses a method for preparing high-purity magnesium hydroxide using impinging flow. The publication number is CN1757597 The Chinese patent discloses a preparation of porous ultra-fine calcium carbonate by impinging flow reaction. The product has good appearance and high production efficiency, but the impinging flow reaction has not been applied in the preparation and production of lithium-ion battery cathode materials.

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