Method for preparing nickel-cobalt lithium aluminate as anode material of lithium ion battery

A nickel-cobalt-aluminate lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficult co-precipitation of aluminum ions, and achieve the effect of improving the electrical properties of materials

Inactive Publication Date: 2013-05-08
HUNAN BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem that aluminum ions are difficult to form co-precipitation with nickel-cobalt ions in the existing method for preparing nickel-cobalt lithium aluminate, the object of the present invention is to provide a method for preparing lithium-ion battery cathode material nickel-cobalt lithium aluminate , this method can better uniformly form co-precipitation of nickel-cobalt-aluminum, and the prepared nickel-cobalt-lithium aluminate positive electrode material has good sphericity, high capacity and excellent cycle performance, and has broad market prospects

Method used

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  • Method for preparing nickel-cobalt lithium aluminate as anode material of lithium ion battery

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Embodiment 1

[0021] A method for preparing lithium-ion battery cathode material nickel-cobalt-aluminate lithium, comprising the following steps:

[0022] (1) Use nickel sulfate and cobalt sulfate to prepare 200 liters of a solution with a nickel-cobalt molar ratio of 8:1.5 and a total nickel-cobalt molar concentration of 2.0 mol / L;

[0023] (2) Prepare 100 liters of 0.2 mol / L sodium metaaluminate solution with 4.0 mol / L sodium hydroxide solution;

[0024] (3) Put the above-mentioned prepared metal salt solution and sodium metaaluminate solution into the reaction kettle through a certain flow rate, and at the same time add sodium hydroxide as a precipitant and ammonia as a complexing agent, and control the reaction temperature in the reaction kettle to 55 ℃, the concentration of ammonia water is 10.0g / L, and the reaction pH value is 11.50. After 40 hours of reaction, filter the precipitate, wash the precipitate with pure hot water at 80°C, and put the precipitate in a 110°C drying oven to d...

Embodiment 2

[0034] A method for preparing lithium-ion battery cathode material nickel-cobalt-aluminate lithium, comprising the following steps:

[0035] (1) Use nickel sulfate and cobalt sulfate to prepare 200 liters of a solution with a nickel-cobalt molar ratio of 7:2.5 and a total molar concentration of nickel-cobalt-manganese of 2.0 mol / L;

[0036] (2) Prepare 100 liters of 0.2 mol / L sodium metaaluminate solution with 4.0 mol / L sodium hydroxide solution;

[0037] (3) Put the above-mentioned prepared metal salt solution and sodium metaaluminate solution into the reaction kettle through a certain flow rate, and at the same time add sodium hydroxide as a precipitant and ammonia as a complexing agent, and control the reaction temperature in the reaction kettle to 30 ℃, the concentration of ammonia water is 10.0g / L, and the reaction pH value is 9.0. After 200 hours of reaction, filter the precipitate, wash the precipitate with pure hot water at 50°C, and dry the precipitate in a 110°C dryi...

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Abstract

The invention discloses a method for preparing nickel-cobalt lithium aluminate as an anode material of a lithium ion battery. The method comprises the following steps: (1) mixing a nickel-cobalt metal salt water solution, a sodium metaaluminate solution, a complexing agent and a precipitant, regulating the pH value of a reaction system to be 9 to 12, and then maintaining a stirring state to carrying out a reaction at the temperature of 30 to 80 DEG C for 20 to 200 hours, thereby obtaining nickel-cobalt aluminum hydroxide precipitates; (2) washing the nickel-cobalt aluminum hydroxide precipitates by using pure water of 50 to 100 DEG C, drying, screening the part of precipitates capable of passing through a sieve being 300 meshes, adding a lithium source to the precipitates, mixing evenly, and sintering at the temperature of 600 to 1000 DEG C, wherein oxygen is filled during the sintering process; and finally sintering for 5 to 50 hours, thereby obtaining the nickel-cobalt lithium aluminate. According to the method, the sodium metaaluminate is adopted as the lithium source, so that the nickel-cobalt aluminum elements can evenly form a coprecipitation, so that the aluminum is evenly distributed in the nickel-cobalt lithium aluminate material. As a result, the electrical performance of the material is improved, and especially the cycling performance of the material is improved.

Description

technical field [0001] The invention relates to a method for preparing nickel-cobalt-aluminate lithium, a cathode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high discharge platform, long cycle life, and no memory effect. They have been widely used in mobile phones, cameras, notebook computers, etc., and will also be used in power batteries such as electric bicycles and electric vehicles. [0003] Lithium cobalt oxide, lithium nickel oxide, lithium nickel cobalt oxide, and lithium nickel cobalt manganese oxide with a layered structure are currently the most studied positive electrode materials. Lithium cobaltate cathode material is the earliest cathode material to be commercialized, but cobalt resources are limited, expensive, and polluted, which limits its further development. Although lithium nickelate has a high discharge capacity, its application is affected due to the difficulty in s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCY02E60/12Y02E60/10
Inventor 刘更好李长东周汉章唐红辉韦立剑
Owner HUNAN BRUNP RECYCLING TECH
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