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A kind of ternary cathode material precursor, preparation method and application thereof

A cathode material and precursor technology, applied in the field of preparation of high-quality ternary cathode material precursors, to achieve low cost of use, improve the effect of impurity removal, and facilitate industrial production

Active Publication Date: 2020-01-24
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of high metal impurity content in the existing ternary positive electrode material precursor, one of the purposes of the present invention is to provide a method for preparing a high-quality ternary positive electrode material precursor, and the metal of the ternary positive electrode material precursor prepared by the method The content of impurities is extremely low, and the content of impurities such as Fe, Cr, Cu and Zn is all below 5ppm, which improves the safety performance and electrochemical performance of the ternary cathode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Weigh nickel sulfate, cobalt sulfate and manganese sulfate in a molar ratio of 1:1:1, then dissolve them in deionized water to prepare a mixed metal salt solution with a uniform concentration of 1.5mol / L, and adjust the pH value to 1.0 with dilute sulfuric acid , with a flow rate of 0.2L / min, it passes through a 4-stage exchange column, and two kinds of cation exchange resins are installed in the exchange column (one kind of cation exchange resin is a three-dimensional network polymer skeleton: polystyrene, functional group: sulfonic acid Another kind of cation exchange resin is a three-dimensional network polymer skeleton: polyacrylic acid, functional group: carboxyl), and the mixed solution after removing impurities is denoted as solution A. Pump solution A, ammonia water and sodium hydroxide together into the co-precipitation reactor for co-precipitation reaction. During the reaction, the pH value of the reaction system is controlled at 10.8, the ammonia content in th...

Embodiment 2

[0055] Nickel chloride, cobalt chloride and manganese chloride are weighed in a molar ratio of 5:2:3, then dissolved in deionized water to prepare a mixed metal salt solution with a uniform concentration of 1.0mol / L, and the pH is adjusted with dilute hydrochloric acid value to 3.0, with a flow rate of 0.4L / min, it passes through a 6-stage exchange column, and two kinds of cation exchange resins are housed in the exchange column (one kind of cation exchange resin is a three-dimensional network polymer skeleton: polystyrene, functional group : sulfonic acid group; Another kind of cation exchange resin is three-dimensional network polymer framework: phenolic, functional group: iminodiacetic acid group), the mixed solution after impurity removal is denoted as solution A. Pump solution A, ammonia water and sodium hydroxide into the co-precipitation reactor for co-precipitation reaction. During the reaction, the pH value of the reaction system is controlled at 11.2, the ammonia cont...

Embodiment 3

[0057] Nickel nitrate, cobalt nitrate and manganese nitrate were weighed in a molar ratio of 6:2:2, then dissolved in deionized water to prepare a mixed metal salt solution with a uniform concentration of 2.0mol / L, and the pH value was adjusted to 4.0 with dilute nitric acid , with a flow rate of 0.3L / min passing through the exchange column with 5 stages, two kinds of cation exchange resins are housed in the exchange column (one kind of cation exchange resin is a three-dimensional network polymer skeleton: polystyrene, functional group: carboxyl; Another cation exchange resin is a three-dimensional network polymer skeleton: polyacrylic acid, functional group: sulfonic acid group), and the mixed solution after impurity removal is designated as solution A. Pump solution A, ammonia water and sodium hydroxide together into the co-precipitation reactor for co-precipitation reaction. During the reaction, the pH value of the reaction system is controlled at 11.6, the ammonia content i...

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PUM

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Abstract

The invention provides a ternary cathode material precursor, a preparation method and an application thereof. The method comprises the following steps: firstly, preparing a mixed metal salt solution, and adjusting the pH value to be 0.1-5.0; removing impurities through an exchange column filled with cation exchange resin; and finally pumping the obtained material, a complexing agent and a precipitant into a coprecipitation reaction kettle simultaneously, and synthesizing a high-quality ternary cathode material precursor with extremely low impurity content through a controlled crystallization method, wherein the chemical formula of the precursor is NixCoyMnz(OH)2; x is less than 1 and greater than or equal to 0.3; y is less than or equal to 0.5 and greater than or equal to 0.05; and x+y+z is equal to 1. Through removing impurities from the mixed metal salt solution, the impurity content in the ternary cathode material precursor is greatly reduced; and the safety performance and the electrochemical property of the ternary cathode material are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, and relates to a ternary positive electrode material precursor, a preparation method and its use, and in particular to a high-quality ternary positive electrode material precursor, a preparation method and its use. Background technique [0002] At present, the commercial lithium-ion battery cathode materials mainly include lithium cobaltate, spinel lithium manganate, ternary materials and lithium iron phosphate. The preparation process of lithium cobaltate is simple, the charge and discharge voltage is high, and the cycle performance is excellent, so it has been widely used. However, the price of cobalt is quite high and continues to rise, and the reserves in my country are very small, which makes the development cost of lithium cobaltate cathode material high. , about 5-6 times that of lead-acid batteries and 2 times that of nickel-metal hydride batteries. The spinel-structured lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈万超杨顺毅任付金
Owner BTR NEW MATERIAL GRP CO LTD