High-radial and high-tap density nickel cobalt lithium aluminate precursor and preparation method thereof

A nickel-cobalt lithium aluminate and precursor technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low tap density, poor electrochemical performance of sintered products, uneven distribution of aluminum elements, etc., and achieve high tap density , high sphericity, the effect of compact internal structure

Active Publication Date: 2019-12-24
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low tap density, uneven distribution of aluminum elements, and poor electrochemical performance of sintered finished products in nickel-cobalt-lithium-aluminate precursors, the present invention provides a high-radiation and high-tap nickel-cobalt-lithium aluminate precursor and its preparation method, to overcome the defects in the prior art, the present invention is a preparation method of nickel cobalt lithium aluminate precursor with excellent physical and chemical properties, good stability and simple process

Method used

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  • High-radial and high-tap density nickel cobalt lithium aluminate precursor and preparation method thereof
  • High-radial and high-tap density nickel cobalt lithium aluminate precursor and preparation method thereof
  • High-radial and high-tap density nickel cobalt lithium aluminate precursor and preparation method thereof

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preparation example Construction

[0030] A preparation method of a highly radial and highly compacted nickel-cobalt-lithium aluminate precursor, comprising the following steps:

[0031] (1) Configuration of the reaction solution: dissolving the nickel salt and the cobalt salt into a mixed salt solution with a concentration of 1 to 3 mol / L, and preparing the aluminum salt into an aluminum salt solution with a concentration of 0.05 to 0.5 mol / L, (preparing the aluminum salt During the solution, an appropriate amount of sodium hydroxide can be selectively added as a co-solvent); the alkali is dissolved into an alkali solution with a concentration of 4-10 mol / L; and an aqueous ammonia solution of 5-13 mol / L is used as a complexing agent.

[0032] Wherein the nickel salt is one of nickel sulfate, nickel chloride, nickel nitrate and nickel acetate; the cobalt salt is one of cobalt sulfate, cobalt chloride, cobalt nitrate and cobalt acetate; the aluminum salt is Sodium metaaluminate; The alkali is sodium hydroxide. ...

Embodiment 1

[0043] Figure 1-4 Shown is the high radial, high vibration nickel cobalt lithium aluminate precursor of the present invention, the molecular formula of the nickel cobalt lithium aluminate precursor is Ni 0.82 co 0.15 Al 0.03 (OH) 2 ; The cross-sectional morphology of the nickel-cobalt-lithium-aluminate precursor is radial from the inside to the outside, and the aluminum element in the material is evenly distributed from the inside to the outside. The primary particle of the precursor is flake-shaped, and the secondary particle is highly spherical. The tap density of the nickel cobalt lithium aluminate precursor is 2.0g / cm 3 , specific surface area 15m 2 / g. The preparation method of the nickel-cobalt-lithium-aluminate precursor of the foregoing embodiment comprises the following steps:

[0044] (1) Configuration of the reaction solution: Dissolve nickel sulfate and cobalt sulfate into a mixed salt solution with a concentration of 2mol / L, prepare sodium metaaluminate in...

Embodiment 2

[0050] The molecular formula of nickel cobalt lithium aluminate precursor is Ni 0.88 co 0.09 Al 0.03 (OH) 2 ; The cross-sectional morphology of the nickel-cobalt-lithium-aluminate precursor is radial from the inside to the outside, and the aluminum element in the material is evenly distributed from the inside to the outside. The primary particle of the precursor is flake-shaped, and the secondary particle is highly spherical. The tap density of the nickel cobalt lithium aluminate precursor is 1.9g / cm 3 , specific surface area 10m 2 / g. The preparation method of the nickel-cobalt-lithium-aluminate precursor of the foregoing embodiment comprises the following steps:

[0051] (1) Configuration of the reaction solution: nickel nitrate and cobalt nitrate are dissolved into a mixed salt solution with a concentration of 1mol / L, and sodium metaaluminate is prepared into a sodium metaaluminate solution with a concentration of 0.05mol / L; Dissolve into a sodium hydroxide solution ...

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Abstract

The invention discloses a high-radial and high-tap density nickel cobalt lithium aluminate precursor and a preparation method thereof. The nickel cobalt lithium aluminate precursor is nickel cobalt aluminum hydroxide, the planed surface is radial from inside to outside, aluminum elements in the material are uniformly distributed from inside to outside, primary particles are laminary, and high tapdensity and high sphericity are achieved. The preparation method disclosed by the invention comprises the processes of seed crystal preparation and crystal growth, and uniform directional growth of the precursor is realized by strictly controlling reaction conditions of nucleation and growth. The method is simple in process, easy in process stable control, excellent in product performance and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium-ion batteries, and in particular relates to a highly radial and highly compacted nickel-cobalt-lithium-aluminate precursor and a preparation method thereof. Background technique [0002] Layered nickel-cobalt-aluminum ternary material (NCA) has the advantages of excellent electrochemical performance, high specific capacity, and low production cost, and has become one of the most promising materials for lithium-ion batteries. The most critical technology of nickel-cobalt-aluminum ternary materials is in the precursor process, because the quality of the precursor (morphology, particle size, particle size distribution, specific surface area, impurity content, tap density, etc.) directly determines the final sintered product physical and chemical indicators. [0003] At present, the main preparation process of nickel-cobalt-aluminum ternary precursor is the co-crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525
CPCH01M4/525Y02E60/10
Inventor 张诚寇亮牛瑶孙静张超田占元邵乐
Owner SHAANXI COAL & CHEM TECH INST
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