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Preparation method of aluminum-coated spherical lithium nickel cobalt aluminum oxide cathode material for lithium-ion battery

A technology of nickel-cobalt-aluminate lithium and lithium-ion batteries, which can be used in battery electrodes, secondary batteries, circuits, etc., and can solve problems such as uneven distribution of particle elements

Inactive Publication Date: 2016-04-06
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and to provide a method for preparing the anode material of an aluminum-coated spherical nickel-cobalt lithium aluminate lithium-ion battery. The aluminum-coated nickel-cobalt lithium aluminate material not only solves the problem of uneven distribution of elements in the particles, but also avoids the problem of side reactions caused by the contact of high-valence nickel ions in the positive electrode material with the electrolyte, thus obtaining Nickel cobalt lithium aluminate material with high vibration, high specific capacity and excellent cycle performance

Method used

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  • Preparation method of aluminum-coated spherical lithium nickel cobalt aluminum oxide cathode material for lithium-ion battery
  • Preparation method of aluminum-coated spherical lithium nickel cobalt aluminum oxide cathode material for lithium-ion battery
  • Preparation method of aluminum-coated spherical lithium nickel cobalt aluminum oxide cathode material for lithium-ion battery

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Embodiment 1

[0040] (1) Preparation of aluminum hydroxide colloid: Dissolve 0.1mol aluminum nitrate in deionized water to make a 2mol / L aqueous solution, slowly add 1mol / L ammonia water dropwise while stirring at room temperature to pH=9.0 to obtain precipitation. Rinse the precipitate with deionized water without aging, suction filter, wash, redisperse the precipitate with water, and add a certain amount of nitric acid at 60°C to control the pH value at 6.0 to make it peptized, and then seal and age at 85°C for 24 hours , to obtain clarified aluminum sol;

[0041](2) Preparation of nickel-cobalt-aluminum hydroxide precursor in the inner layer: mix the soluble salts of nickel and cobalt in a molar ratio of Ni:Co=0.8:0.15 to form a mixed salt solution with a concentration of 2mol / L; Sodium is prepared into a solution with a concentration of 4mol / L; ammonia water is prepared into a solution of 5mol / L; the molar ratio of the mixed salt solution and aluminum sol is: Ni:Co:Al=0.8:0.15:0.03, and...

Embodiment 2

[0046] (1) Preparation of aluminum hydroxide colloid: Dissolve 0.1mol aluminum nitrate in deionized water to make a 2mol / L aqueous solution, slowly add 1mol / L ammonia water dropwise while stirring at room temperature to pH=9.0 to obtain precipitation. Rinse the precipitate with deionized water without aging, suction filter, wash, redisperse the precipitate with water, and add a certain amount of nitric acid at 60°C to control the pH value at 6.0 to make it peptized, and then seal and age at 85°C for 24 hours , to obtain clarified aluminum sol;

[0047] (2) Preparation of nickel-cobalt-aluminum hydroxide precursor in the inner layer: mix the soluble salts of nickel and cobalt at a molar ratio of Ni:Co=0.815:0.15 to form a mixed salt solution with a concentration of 3mol / L; Sodium is prepared into a solution with a concentration of 3mol / L; ammonia water is prepared into a solution of 4mol / L; the molar ratio of the mixed salt solution and the aluminum sol is Ni:Co:Al=0.815:0.15:0...

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Abstract

The invention discloses a preparation method of an aluminum-coated spherical lithium nickel cobalt aluminum oxide cathode material for a lithium-ion battery. The method comprises the following steps: firstly, dissolving an aluminum salt into water, and adding ammonia water to obtain sediments; dispersing the sediments, adding nitric acid to peptize the sediments, and ageing the product to obtain aluminum hydroxide gel; adding a nickel-cobalt mixed metal salt solution and the aluminum hydroxide gel, adding a complexing agent and a precipitant for reaction, and carrying out suction filtration, washing and drying to obtain inner spherical nickel cobalt aluminum hydroxide precursor powder; dispersing the precursor powder, carrying out precipitation with an aluminum salt solution and ammonia water and preparing an aluminum-coated spherical nickel cobalt aluminum precursor; mixing a lithium source and the aluminum-coated spherical nickel cobalt aluminum precursor evenly; and sintering the mixture, so as to obtain aluminum-coated spherical lithium nickel cobalt aluminum oxide powder. The nanoscale aluminum-coated lithium nickel cobalt aluminum oxide material with a constant crystal structure is prepared; and the lithium nickel cobalt aluminum oxide material with high tap density, high specific capacity and excellent cycle performance is obtained.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a method for preparing an aluminum-coated spherical nickel-cobalt-lithium-aluminate lithium-ion battery cathode material. Background technique [0002] Lithium-ion batteries are widely used in various portable personal electronic devices because of their high output voltage, high specific energy, long cycle life, good safety performance, and no memory effect. However, with the increasing demand for energy in human society and the depletion of energy reserves, on the other hand, the current development of electronic equipment tends to require lithium-ion batteries with the characteristics of small size, large capacity, and light weight. Therefore, the development of lithium-ion batteries with high specific energy is of great significance and practical value. The positive electrode material is an important factor to improve the energy density of lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博刘辉杜显振
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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