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Nickel-cobalt-aluminum hydroxide precursor, preparation method thereof, anode material and battery

A hydroxide, nickel-cobalt-aluminum technology, applied in the field of electrochemistry, can solve the problems of small particles, poor crystallinity, uneven particle size, etc., and achieve the effect of uniform particle size

Active Publication Date: 2020-02-04
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Lithium batteries are widely used in existing batteries, and nickel-cobalt-aluminate lithium material (NCA) is the most commonly used battery material in lithium batteries. The precursor of nickel-cobalt-aluminum hydroxide is an indispensable raw material for the preparation of NCA. The performance of the cobalt aluminum hydroxide precursor directly affects the performance of NCA, and then affects the electrochemical performance of the entire battery. However, the nickel cobalt aluminum hydroxide precursor in the prior art has uneven particle size, small particles, and poor crystallinity. And the density is not high

Method used

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  • Nickel-cobalt-aluminum hydroxide precursor, preparation method thereof, anode material and battery
  • Nickel-cobalt-aluminum hydroxide precursor, preparation method thereof, anode material and battery
  • Nickel-cobalt-aluminum hydroxide precursor, preparation method thereof, anode material and battery

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preparation example Construction

[0095] The invention provides a method for preparing a nickel-cobalt-aluminum hydroxide precursor, comprising:

[0096] In the embodiment of the present invention, a surfactant is added during the preparation of the nickel-cobalt-aluminum hydroxide precursor by the chemical co-precipitation method to promote the particle growth of the nickel-cobalt-aluminum hydroxide precursor, especially the primary particle growth, so that the The morphology of the nickel-cobalt-aluminum hydroxide precursor tends to be spherical. At the same time, it can make the crystal grow in a certain direction, increase the crystallinity, improve the density, and then improve the performance of the precursor, and the surfactant will not affect the precursor. The layered structure ensures the performance of the precursor.

[0097] Specifically, the surfactant includes at least one of anionic surfactants, nonionic surfactants and zwitterionic surfactants. Anionic surfactants are ionized in water, and the...

Embodiment 1

[0191] Take 94.63gNiSO 4 ·6H 2 O, 18.98gCoSO 4 ·7H 2 O, 7.50gAl 2 (SO4) 2 18H 2 O is made into a metal salt solution with a nickel-cobalt-aluminum concentration of 1.5 mol / L. Prepare the first mixed solution with NaOH concentration of 3 mol / L, ammonia concentration of 0.6 mol / L, and sodium dodecylbenzenesulfonate of 6 g / L. A second mixed solution with an ammonia concentration of 0.3 mol / L and a sodium dodecylbenzenesulfonate of 3 g / L was prepared.

[0192] The initial pH of the second mixed solution was 11.12, and the temperature was 50°C. Then inject the metal salt solution and the first mixed solution into the reaction kettle containing the second mixed solution respectively, adjust the flow rate of the first mixed solution to control the pH of the reaction system=10.00±0.03, the temperature is 50°C, and the stirring speed is 540r / min , the reaction time is 3h, and the slurry of nickel-cobalt-aluminum hydroxide is obtained. The slurry is naturally cooled and left to ...

Embodiment 2

[0195] Take 210.28gNiSO 4 ·6H 2 O, 42.17gCoSO 4 ·7H 2 O is formulated into a metal salt solution with a nickel-cobalt concentration of 1.6 mol / L. Take 4.10g NaAlO 2 , 8.00g of NaOH is prepared into aluminum solution, the concentration of aluminum solution is 0.17mol / L. Prepare NaOH concentration as 2mol / L, ammonia concentration as 0.6mol / L, sodium dodecylbenzenesulfonate as the first mixed solution of 6g / L, prepare ammonia concentration as 0.3mol / L, dodecylbenzenesulfonic acid Sodium is the second mixed solution of 3g / L.

[0196] The initial pH of the second mixed solution was 11.20, and the temperature was 50°C. Then the metal salt solution, the aluminum solution, and the first mixed solution are injected into the reaction kettle containing the second mixed solution respectively, and the flow rate of the first mixed solution is adjusted to control the pH of the reaction system=10.00±0.03, the temperature is 50° C., and the stirring speed is 900r / min, the reaction time ...

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Abstract

The invention relates to the field of electrochemical technologies, in particular to a nickel-cobalt-aluminum hydroxide precursor, a preparation method thereof, an anode material and a battery. The preparation method of the nickel-cobalt-aluminum hydroxide precursor comprises the steps that a surfactant is added into a reaction system of a chemical coprecipitation method for modification, growth of particles of the nickel-cobalt-aluminum hydroxide precursor is promoted, and the form of the nickel-cobalt-aluminum hydroxide precursor tends to be spherical. According to the preparation method, byadding the surfactant during chemical coprecipitation, size increase of the particles, particularly first-time particles, is benefited, granularity is uniform, the form tends to be spherical, variousactive groups exist on the organization structure of the nickel-cobalt-aluminum hydroxide precursor, therefore, metal ions are chelated or adsorbed, or crystals can grow directionally or generate hydrogen-bond interaction with other compounds. As a result, the material structure is more complete, the degree of crystallinity is higher, and the electrochemical performance of the precursor is improved.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a nickel-cobalt-aluminum hydroxide precursor, a preparation method thereof, a positive electrode material and a battery. Background technique [0002] Lithium batteries are widely used in existing batteries, and nickel-cobalt-aluminate lithium material (NCA) is the most commonly used battery material in lithium batteries. The precursor of nickel-cobalt-aluminum hydroxide is an indispensable raw material for the preparation of NCA. The performance of the cobalt aluminum hydroxide precursor directly affects the performance of NCA, and then affects the electrochemical performance of the entire battery. However, the nickel cobalt aluminum hydroxide precursor in the prior art has uneven particle size, small particles, and poor crystallinity. And the density is not high. [0003] In view of this, the present invention is proposed. Contents of the invention [0004] The obj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M10/052
CPCH01M4/485H01M4/525H01M10/052H01M2004/028Y02E60/10
Inventor 黄玲王英唐仁衡肖方明李文超
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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