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A kind of preparation method of nickel-cobalt-aluminum spherical precursor of cathode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor electrochemical stability, unstable material performance, high sintering temperature, etc., and achieve easy control of the reaction, easy control, particle size evenly distributed effect

Inactive Publication Date: 2016-04-20
GUIZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the synthesis of nickel-cobalt lithium aluminate cathode material Li(Ni x co y al z )O 2 The methods mainly include solid-phase method, co-precipitation method and sol-gel method. The solid-phase method has simple process and low cost, but poor electrochemical stability; the co-precipitation method is to prepare spherical hydroxide in the reaction kettle. The precursor is then mixed with lithium salt according to the proportion, and then sintered and solid-phase reacted at high temperature. The process is relatively simple, the material capacity is high, and the cycle performance is good, but the sintering temperature is high and energy consumption is large: sol-gel method Synthetic material performance is unstable

Method used

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  • A kind of preparation method of nickel-cobalt-aluminum spherical precursor of cathode material of lithium ion battery
  • A kind of preparation method of nickel-cobalt-aluminum spherical precursor of cathode material of lithium ion battery
  • A kind of preparation method of nickel-cobalt-aluminum spherical precursor of cathode material of lithium ion battery

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Embodiment 1

[0023] Embodiment 1: An appropriate amount of nickel sulfate, cobalt sulfate and aluminum chloride are dissolved into a metal mixed salt solution, in the metal mixed salt solution, the concentration of nickel sulfate is 0.4mol / L, the concentration of cobalt sulfate is 0.075mol / L, aluminum chloride The concentration is 0.025mol / L. Then the above-mentioned metal mixed salt solution, complexing agent aqueous solution, and precipitating agent aqueous solution are continuously injected into the reaction kettle at a temperature of 20-60°C through a precision flow control system, and the complexing agent is ammonia water, and the concentration of the complexing agent is 6.0mol / L; the precipitant is a mixture of sodium hydroxide and potassium hydroxide, and the concentration of the precipitant is 1.0mol / L; the stirring speed of the reaction system is controlled to be 100r / min, the pH value of the reaction solution is controlled to be 11.0, and the precipitation is formed by continuous...

Embodiment 2

[0024] Embodiment 2: appropriate nickel nitrate, cobalt nitrate and aluminum nitrate are dissolved into metal mixed salt solution, in the metal mixed salt solution, nickel nitrate concentration is 0.8mol / L, cobalt nitrate concentration is 0.15mol / L, aluminum nitrate concentration is 0.05mol / L. Then, the above-mentioned metal mixed salt solution, complexing agent aqueous solution, and precipitating agent aqueous solution are continuously injected into the reaction kettle with a temperature of 20-60°C respectively through a precision flow control system. The complexing agent is ammonia water, and the concentration of the complexing agent is 9mol / L; the precipitant is sodium hydroxide, the concentration of the precipitant is 2mol / L; the stirring speed of the reaction system is controlled to 180r / min, the pH value of the reaction solution is controlled to be 11.0, and the reaction continues to form a precipitate, followed by pressure filtration and washing to obtain a clean filte...

Embodiment 3

[0025] Embodiment 3: Dissolving an appropriate amount of nickel chloride, cobalt chloride and aluminum nitrate into a metal mixed salt solution, in the metal mixed salt solution, the concentration of nickel chloride is 1.2mol / L, and the concentration of cobalt chloride is 0.225mol / L, The concentration of aluminum nitrate is 0.075mol / L. Then, the above-mentioned metal mixed salt solution, complexing agent aqueous solution, and precipitating agent aqueous solution are respectively continuously injected into the reaction kettle at a temperature of 20-60°C through a precision flow control system, wherein the complexing agent is ammonia water, and the concentration of the complexing agent is 12mol / L; the precipitant is potassium hydroxide, the precipitant concentration is 3mol / L; the stirring speed of the reaction system is controlled to 250r / min, the pH value of the reaction solution is controlled to be 11.0, and the reaction continues to form a precipitate, followed by pressure f...

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Abstract

The invention discloses a preparation method of a nickel-cobalt-aluminum spherical precursor of a positive material of a lithium ion battery. The preparation method comprises the following steps of dissolving water-soluble nickel salts, cobalt salts and aluminum salts to form a metal mixed salt water solution, respectively and continuously injecting the metal mixed salt water solution, a complexing agent water solution and a precipitant water solution into a reaction kettle at 20-60 DEG C through a precise flow control system, controlling the stirring speed of a reaction system and the pH value of a reaction liquid, continuously reacting to generate precipitates, carrying out filter pressing and washing, dispersing cleaned filter cakes into distilled water, controlling the solid-to-liquid ratio to prepare a slurry liquid, carrying out spray drying on the prepared slurry liquid, and controlling the air inlet temperature and air outlet temperature, so as to obtain the nickel-cobalt-aluminum spherical precursor. The preparation method of the nickel-cobalt-aluminum spherical precursor has the advantages that the technological process is simple, the reaction is easy to control, the spherical degree of the product is good, the size distribution is uniform, the development prospect is wide, and the market potential is large.

Description

technical field [0001] The invention relates to a preparation process of a lithium-ion battery positive electrode material, in particular to a preparation method of a nickel-cobalt-aluminum spherical precursor, belonging to the technical field of lithium-ion secondary battery positive electrode materials. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices such as mobile phones, cameras, and laptops due to their high energy density and high discharge platform. As people's requirements for lithium-ion batteries are getting higher and higher, people need lithium-ion batteries with longer service life, smaller size and lighter weight, which requires that the positive electrode materials of lithium-ion batteries should have good safety and specific capacity. High performance, cycle stability, etc., but the mature lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and nickel-cobalt-manganese ternary materials are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52
CPCY02E60/10
Inventor 程琥丁方
Owner GUIZHOU NORMAL UNIVERSITY