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Preparation method for positive electrode active material, and positive electrode active material

A cathode active material and seed crystal technology, which is applied to the preparation of cathode active materials and the field of cathode active materials, can solve the problems of easily irregular morphology, difficult uniform distribution of metal elements, poor crystallization performance of quaternary precursors, etc. Stable, high sphericity, regular shape effects

Inactive Publication Date: 2016-05-25
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, the alkali solution is directly added to the solution of four metal salts to precipitate a quaternary precursor. The crystallization performance of the quaternary precursor obtained by this method is poor, and the metal elements are difficult to be evenly distributed. Phase-pure quaternary cathode materials obtained

Method used

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  • Preparation method for positive electrode active material, and positive electrode active material
  • Preparation method for positive electrode active material, and positive electrode active material
  • Preparation method for positive electrode active material, and positive electrode active material

Examples

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preparation example Construction

[0027] The preparation method of composite graphite provided by the invention comprises the steps:

[0028] S1. Mix the reaction seed crystal and complexing agent solution to form a reaction solution; the reaction seed crystal is one or more hydroxides of nickel, cobalt, manganese or aluminum; the D50 of the reaction seed crystal is ≤ 2 -6μm;

[0029] S2. Under stirring and ultrasonic conditions, adding a metal salt solution and a precipitating agent solution to the reaction solution, adjusting the pH to 9-13 for reaction; then washing and drying to obtain a precursor;

[0030] The metal salt solution is a solution containing nickel salt, cobalt salt, manganese salt and aluminum salt;

[0031] S3. Mix the precursor with the lithium source, then keep the temperature at 500-950° C. for 2-24 hours, and obtain the positive electrode active material after cooling.

[0032] The above-mentioned reaction seed crystal is used as the inner core, and various metals are precipitated and...

Embodiment 1

[0059] This example is used to illustrate the preparation method of the cathode active material disclosed in the present invention.

[0060] (1) prepare salt solution, be 81.5:10:5:3.5 ratio by the mol ratio of metal element nickel, cobalt, manganese, aluminum, nickel sulfate, cobalt sulfate, manganese sulfate and aluminum sulfate are dissolved in pure water, be mixed with A metal salt solution with a total metal content of 2mol / L;

[0061] (2) Take a certain amount of sodium hydroxide and be dissolved in pure water, be mixed with the precipitant alkali solution that concentration is 4mol / L, stand-by; Preparation concentration is the complexing agent ammonia solution of 5.0mol / L, stand-by;

[0062](3) Open the co-precipitation reactor, adjust the reaction temperature to be 60°C, and the stirring speed to be 600r / min, and add a certain amount of D50 to the reactor to be 3.5 μm quaternary precursor reaction crystal (quaternary precursor of nickel, cobalt, manganese and aluminum)...

Embodiment 2

[0069] This example is used to illustrate the preparation method of the cathode active material disclosed in the present invention.

[0070] (1) To prepare salt solution, the molar ratio of metal elements nickel, cobalt, manganese and aluminum is 80:10:5:5, and nickel sulfate, cobalt sulfate, manganese sulfate and aluminum sulfate are dissolved in pure water to prepare A metal salt solution with a total metal content of 2mol / L;

[0071] (2) Take a certain amount of sodium hydroxide and be dissolved in pure water, be mixed with the precipitant alkali solution that concentration is 4mol / L, stand-by; Preparation concentration is the complexing agent ammonia solution of 5.0mol / L, stand-by;

[0072] (3) Open the reaction kettle, adjust the reaction temperature to be 60°C, and the stirring speed is 600r / min, and add a certain amount of D50 to the reaction kettle, which is a quaternary precursor reaction seed crystal of 5 μm (quaternary hydroxide of nickel, cobalt, manganese and alum...

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Abstract

For overcoming the problems of irregular shape, uneven element distribution and partial agglomeration of metal elements of a positive electrode active material prepared by a method in the prior art, the invention provides a preparation method for the positive electrode active material, comprising the steps of S1, mixing a reaction seed crystal with a complexing agent solution, wherein the reaction seed crystal is hydroxide of one or more of nickel, cobalt, manganese or aluminum; and the D50 of the reaction seed crystal is less than or equal to 2-6 [mu]m; S2, under a condition of stirring and ultrasonic processing, adding a metal salt solution and a precipitator solution, regulating PH to 9-13; and then washing and drying to obtain a precursor, wherein the metal salt solution is a solution containing nickel salt, cobalt salt, manganese salt and aluminum salt; and S3, mixing the precursor with a lithium source, performing heat preservation at a temperature of 500-950 DEG C for 2-24h, and cooling. Meanwhile, the invention also discloses the positive electrode active material prepared by the method. The positive electrode active material provided by the invention is regular in shape, high in degree of sphericity, uniform in element distribution and free of partial agglomeration of metal elements; and in addition, the positive electrode active material is high in cycling performance, thermal stability and security.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode active material and a positive electrode active material prepared by the method. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high energy efficiency, long cycle life, no memory effect, fast charge and discharge, low self-discharge rate, wide operating temperature range, safety and reliability, etc., so it has become an important research direction for scientists all over the world. In recent years, with the rapid development of consumer electronics, electric vehicles, reserve power supplies, portable medical electronic equipment, industrial control, aerospace and other fields, there is an urgent need for rechargeable batteries with higher energy density, higher power density, and longer life. Put the energy storage device. [0003] Cathode material LiNiO for lithium-ion batteries 2 、LiCoO 2 and LiMn 2 o 2 Due to their respective...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 任付金杨顺毅陈万超吴小珍
Owner BTR NEW MATERIAL GRP CO LTD
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