Method for preparing single crystal NCMA precursor material

A precursor and single crystal technology, which is applied in the field of preparing single crystal NCMA precursor materials, can solve the problems of performance degradation of positive electrode materials, enrichment of aluminum ion content, etc., and achieves improved tap density, improved electrochemical performance, and good market application. Foreground effect

Pending Publication Date: 2021-01-08
ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the aluminum ion content of the precursor prepared by this method is locally enriched, resulting in a decrease in the performance of the positive electrode material.

Method used

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  • Method for preparing single crystal NCMA precursor material
  • Method for preparing single crystal NCMA precursor material
  • Method for preparing single crystal NCMA precursor material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1, prepare solution B: Weigh 1.5Kg of aluminum sulfate and slowly add it to 5L of pure water; Step 2, prepare solution C: use a peristaltic pump to pump solution B into 45L of 5mol / L hydrogen hydroxide at a rate of 5L / h In the sodium solution, prepare solution C; Step 3, prepare solution A: NiSO with a concentration of 1.5mol / L 4 、CoSO 4 , MnSO 4 The three solutions were prepared according to the volume ratio of 85:5:5, with a concentration of 1.5mol / L NiSO 4 、CoSO 4 , MnSO 4 Mixed solution, and add EDTA to be mixed with the mixed solution A that EDTA molar concentration is 0.1mol / L. Use a peristaltic pump to pump solution C and solution A into a 50L reactor, and use the main and auxiliary bases to control the pH of the reactor; solution C is the main base with a fixed flow rate of 2L / h; the auxiliary base is hydrogen with a concentration of 5mol / L Sodium oxide solution controls the pH of the reactor, and the solution A flow rate is 3L / h. Control the temperat...

Embodiment 2

[0036] Step 1, prepare solution B: Weigh 1.5Kg of aluminum sulfate and slowly add it to 5L of pure water; Step 2, prepare solution C: use a peristaltic pump to pump solution B into 45L of 5mol / L hydrogen hydroxide at a rate of 5L / h In the sodium solution, be prepared into solution C; Step 3, prepare solution A: the NiSO with concentration all 1.8mol / L 4 、CoSO 4 , MnSO 4 The three solutions were prepared according to the volume ratio of 88:6:3, with a concentration of 1.8mol / L NiSO 4 、CoSO 4 , MnSO 4 Mixed solution, and add EDTA to be mixed with the mixed solution A that EDTA molar concentration is 0.1mol / L. Use a peristaltic pump to pump solution C and solution A into a 50L reactor, and use the main and auxiliary bases to control the pH of the reactor; solution C is the main base with a fixed flow rate of 1.5L / h; the auxiliary base is 5mol / L Sodium hydroxide solution controls the pH of the reactor, and the solution A flow rate is 3L / h. Control the temperature of the reac...

Embodiment 3

[0039] Step 1, prepare solution B: Weigh 1.5Kg of aluminum sulfate and slowly add it to 5L of pure water; Step 2, prepare solution C: use a peristaltic pump to pump solution B into 45L of 5mol / L hydrogen hydroxide at a rate of 5L / h In the sodium solution, prepare solution C; Step 3, prepare solution A: the concentration is 2mol / L NiSO 4 、CoSO 4 , MnSO 4 The three solutions were prepared according to the ratio of 90:8:1, with a concentration of 2.0mol / L NiSO 4 、CoSO 4 , MnSO 4 Mixed solution, and add EDTA to be mixed with the mixed solution A that EDTA molar concentration is 0.1mol / L. Use a peristaltic pump to pump solution C and solution A into a 50L reactor, and use the main and auxiliary base to control the pH of the reactor; solution C is the main base with a fixed flow rate of 1L / h; the auxiliary base is hydrogen with a concentration of 5mol / L Sodium oxide solution controls the pH of the reactor, and the solution A flow rate is 3L / h. Control the temperature of the re...

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Abstract

The invention discloses a method for preparing a single crystal NCMA precursor material, and belongs to the technical field of battery preparation, wherein the general formula of the NCMA precursor is(NiaCobMncAld)OH2, a is more than or equal to 0.8 and less than 1, b is more than 0 and less than or equal to 0.1, c is more than 0 and less than or equal to 0.1, d is more than or equal to 0.01 andless than or equal to 0.05, a+b+c+d is equal to 1, and the particle size of the nickel-cobalt-manganese precursor is 3.5-4.5 [mu]m. The method comprises: dissolving soluble nickel salt, cobalt salt and manganese salt in pure water to obtain a mixed solution A; dissolving soluble aluminum salt in pure water to obtain a solution B; adding the solution B into a sodium hydroxide solution at a certainrate to obtain a solution C; by using a green complexing agent EDTA and a sodium hydroxide solution as precipitants, adding the solution A, the solution C and a sodium hydroxide solution into a reaction kettle at a certain flow rate, controlling the temperature and pH, and carrying out a coprecipitation reaction; and finally aging, washing and drying the obtained product to obtain the nickel-cobalt-manganese precursor. Compared with the traditional process, the method of the invention has the advantages of more uniform aluminum ion distribution, better process control, simpler operation and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of battery preparation, and in particular relates to a method for preparing a single crystal NCMA precursor material. Background technique [0002] The cathode materials currently occupying the lithium battery market mainly include lithium cobaltate, lithium manganate, ternary materials, and lithium iron phosphate. The high specific energy batteries of nickel-cobalt-aluminum and nickel-cobalt-manganese-aluminum materials have become a research hotspot in the field of lithium-ion power batteries. The ternary material high nickel is even more unstoppable. However, the stability of the positive electrode material caused by the extremely high nickel content, the electrolyte matching problem, and the battery failure caused by high current charging temperature rise have attracted more and more attention. Therefore, single crystal materials have emerged as the times require. . Single crystal materials not only e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M4/485H01M10/0525C01P2004/03C01P2004/61C01P2006/11Y02E60/10
Inventor 许益伟吉同棕周浩王明余凡毛秦钟王寅峰钱志挺吴海军
Owner ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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