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Preparation method of nickel cobalt manganese precursor with special internal structure

An internal structure, nickel-cobalt-manganese technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems that the positive electrode material does not have capacity retention and cycle performance, cations are easy to mix, and lithium ions are not easy to deintercalate, etc. , to achieve good capacity retention and cycle performance, reduce lithium-nickel mixed discharge, and reduce energy

Inactive Publication Date: 2018-05-25
ZHEJIANG HUAYOU COBALT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common method for preparing nickel-cobalt-manganese hydroxide is the co-precipitation method of controlled crystal hydroxide, but the internal structure of the nickel-cobalt-manganese precursor material prepared by the existing method cannot be regularly arranged in a certain direction, and lithium ions are not easy to deintercalate. The cations are prone to be mixed, and the sintered cathode material does not have good capacity retention and cycle performance

Method used

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  • Preparation method of nickel cobalt manganese precursor with special internal structure
  • Preparation method of nickel cobalt manganese precursor with special internal structure

Examples

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Effect test

Embodiment 1

[0022] A method for preparing a nickel-cobalt-manganese precursor material with a special internal structure includes the following steps:

[0023] (1) Configure a nickel-cobalt-manganese salt solution with a metal ion concentration of 2.0mol / L, configure a sodium hydroxide solution with a concentration of 250g / L, and configure an ammonia concentration of 21%;

[0024] (2) Add deionized water to the sealed reactor until it just floods the lower stirring paddle, the stirring speed is 400rpm, the temperature is raised to 60℃, and nitrogen or argon gas protection is provided for more than 2 hours;

[0025] (3) Add reducing agent, sodium hydroxide solution, ammonia water to the bottom solution, adjust the ammonia concentration to 8.0~10.0g / L, pH value of 10.0~12.0, and the mass of reducing agent to 5% of the total mass of the three metal ions ;

[0026] (4) Add the nickel cobalt manganese salt solution, sodium hydroxide solution and ammonia water to the reaction kettle at the same time, a...

Embodiment 2

[0030] A method for preparing a nickel-cobalt-manganese precursor material with a special internal structure includes the following steps:

[0031] (1) Configure a nickel-cobalt-manganese salt solution with a metal ion concentration of 1.0mol / L, configure a sodium hydroxide solution with a concentration of 150g / L, and configure an ammonia concentration of 10%;

[0032] (2) Add deionized water to the sealed reactor until it just floods the lower stirring paddle, the stirring speed is 300 rpm, the temperature is raised to 50 ℃, and nitrogen or argon gas protection is passed for more than 2 hours;

[0033] (3) Add reducing agent, sodium hydroxide solution, ammonia water to the bottom liquid, adjust the ammonia concentration to 6.0~8.0g / , pH value of 10.0~12.0, and the mass of reducing agent to 0.1% of the total mass of the three metal ions;

[0034] (4) Add the nickel cobalt manganese salt solution, sodium hydroxide solution and ammonia water to the reaction kettle at the same time, and m...

Embodiment 3

[0038] A method for preparing a nickel-cobalt-manganese precursor material with a special internal structure includes the following steps:

[0039] (1) Configure a nickel-cobalt-manganese salt solution with a metal ion concentration of 3.0mol / L, configure a sodium hydroxide solution with a concentration of 300g / L, and configure a ammonia concentration of 30%;

[0040] (2) Add deionized water to the sealed reaction vessel until it just floods the lower stirring paddle, the stirring speed is 500 rpm, the temperature is raised to 70 ℃, and nitrogen or argon gas protection is provided for more than 2 hours;

[0041] (3) Add reducing agent, sodium hydroxide solution, ammonia water to the bottom solution, adjust the ammonia concentration to 10.0~12.0g / L, pH value of 10.0~12.0, and the mass of reducing agent to 10% of the total mass of the three metal ions ;

[0042] (4) Add the nickel cobalt manganese salt solution, sodium hydroxide solution, and ammonia water to the reaction kettle at the ...

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Abstract

The invention relates to the technical field of preparation of raw materials of a lithium ion battery ternary positive electrode material, in particular to a preparation method of a nickel cobalt manganese precursor with a special internal structure. A reducing agent is added into a base solution, Mn<3+> which is partially oxidized is reduced into Mn<2+>, oxidation in the period of crystal nucleusformation is reduced, the crystallinity degree of the crystal nucleus is increased, the internal structure arranged regularly is synthesized, and the special internal structure arranged radially fromthe centers of the granules to outside is formed. The internal structure is arranged directionally to a certain degree, energy required by lithium ion diffusion can be reduced, the Li<+> diffusion coefficient is increased, lithium ion diffusion and disembedding are benefited, and lithium nickel mixed discharge is reduced, so that the sintered positive electrode material has high capacity retaining rate and cycling performance.

Description

Technical field [0001] The present invention relates to the technical field of raw material preparation of ternary positive electrode materials for lithium ion batteries, in particular to a method for preparing a nickel-cobalt-manganese precursor material with a special internal structure. Background technique [0002] Nowadays, the rapid development of mobile electronic equipment, electric vehicles and hybrid vehicles has promoted the rapid development of lithium-ion battery technology. However, current cathode materials for lithium-ion batteries, such as lithium cobalt oxide and lithium iron phosphate, have the disadvantage of low capacity and cannot meet the requirements of future energy development. Lithium nickel cobalt manganese oxide has the advantages of high specific capacity, good thermal stability and low price. It is one of the most promising cathode materials for lithium-ion batteries and has good application prospects in the fields of electric vehicles and power too...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 朱玉华王娟邱天周勤俭高炯信沈震雷
Owner ZHEJIANG HUAYOU COBALT
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