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Preparation method of layered nano-nickel cobalt lithium aluminate as positive electrode material for lithium ion battery

A cathode material layer, lithium ion battery technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology and other directions, can solve the problems of complex preparation process, achieve simple recovery method, good electrochemical performance, Conditional effects

Active Publication Date: 2022-02-01
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Description
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a preparation method of layered nano-nickel-cobalt-aluminate lithium lithium ion battery positive electrode material, which can overcome the defects of complex preparation process of the prior art method, so that the prepared nickel-cobalt-aluminate Lithium cathode material particles have better physical and electrochemical properties

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  • Preparation method of layered nano-nickel cobalt lithium aluminate as positive electrode material for lithium ion battery
  • Preparation method of layered nano-nickel cobalt lithium aluminate as positive electrode material for lithium ion battery
  • Preparation method of layered nano-nickel cobalt lithium aluminate as positive electrode material for lithium ion battery

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preparation example Construction

[0033] Aiming at the defect that the preparation process of the prior art method is complicated, a typical embodiment of the present invention provides a method for preparing a lithium-ion battery positive electrode material layered nano-nickel-cobalt lithium aluminate, including:

[0034] Step 1, preparing a nano nickel cobalt aluminum hydroxide precursor.

[0035] a) Dissolving soluble nickel salt, cobalt salt and aluminum salt in deionized water to prepare mixed metal salt solution A with a total metal ion concentration of 0.2-2mol / L.

[0036] b) Sodium hydroxide is dissolved in deionized water to prepare a precipitant solution with a concentration of 1-10mol / L, and ammonia water with a concentration of 0.1-1mol / L is used as a complexing agent, and the precipitant and complexing agent are mixed by volume The ratio is 2-4 to prepare mixed solution B containing complexing agent and precipitating agent.

[0037] c) Mix the mixed metal salt solution A, the organic phase, the s...

Embodiment 1

[0056] Dissolve nickel sulfate, cobalt sulfate and aluminum sulfate in deionized water to configure mixed metal salt solution A. The total ion concentration of Ni+Co+Al is 0.2mol / L, where Ni:Co:Al (mass ratio) =80:15:5.

[0057] Prepare 30 mL of 1 mol / L sodium hydroxide aqueous solution, and add 15 mL of ammonia solution with a mass concentration of 0.1 mol / L to form a mixed solution B containing complexing agent and precipitating agent.

[0058] Add 100g cetyltrimethylammonium bromide (surfactant, HLB value 15.8) and 100mL n-butanol (as co-surfactant and organic phase) to the above 50mL mixed metal salt solution A, at 500rmp Stir for 20 min to form a homogeneous mixture C. The ammonia-alkali mixed solution B is added in the above-mentioned mixed solution C by a peristaltic pump at a rate of 150ml / h, and is stirred with a stirring rate of 500rmp while adding dropwise, and the pH value of the system is strictly controlled in the reaction process, so that the pH of the system= ...

Embodiment 2

[0064] Dissolve nickel nitrate, cobalt nitrate and aluminum nitrate in deionized water to configure mixed metal salt solution A. The total ion concentration of Ni+Co+Al is 0.6mol / L, where Ni:Co:Al (mass ratio) =75:15:10.

[0065] Prepare 30 mL of 5 mol / L sodium hydroxide aqueous solution, and add 15 mL of ammonia solution with a mass concentration of 0.5 mol / L to form a mixed solution B containing complexing agent and precipitating agent.

[0066] Add 80g of polyoxyethylene alkyl aryl ether (surfactant, HLB value 13) and 120mL of n-hexanol (as a co-surfactant and organic phase) into the above 50mL mixed metal salt solution A, and stir at 400rmp for 25min A homogeneous mixture C is formed. The ammonia-alkali mixed aqueous solution B is added in the above-mentioned mixed solution C by a peristaltic pump at a rate of 100ml / h, and is stirred with a stirring rate of 400rmp while adding dropwise, and the pH value of the system is strictly controlled in the reaction process, so that...

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Abstract

The invention relates to a preparation method of layered nano-nickel-cobalt-aluminate lithium lithium ion battery cathode material. The method comprises mixing a soluble metal salt mixed aqueous solution, an organic solution, a surfactant and a co-surfactant; and mixing an ammonia-alkali mixed aqueous solution Slowly add dropwise to the above mixed solution, stir quickly, fully react, and then conduct solid-liquid separation to obtain a precipitate; the obtained precipitate is cleaned and dried to obtain the required precursor; the obtained precursor is mixed with an appropriate amount of lithium source evenly After being placed in an oxygen atmosphere, calcined and cooled at an appropriate temperature, the nano-nickel-cobalt-aluminate-lithium-aluminate lithium ion battery positive electrode material is obtained. The preparation process of the method is simple and controllable, and the obtained NCA cathode material has good physical characteristics and electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a method for preparing layered nano-nickel-cobalt lithium aluminate (NCA), a lithium-ion battery cathode material. Background technique [0002] Due to the development of economy and the increase of population, the problems of energy and environment are becoming more and more prominent nowadays. As a promising energy source, lithium-ion batteries are widely used in mobile portable electronic products, electric vehicles, aerospace, military and other fields. The cathode material in lithium-ion batteries is the key to restricting the development of lithium-ion battery technology, and further improving the energy density, safety, and cycle stability of cathode materials has become the current development direction of cathode materials for lithium-ion batteries. [0003] Since Goodenough invented LiCoO 2 , after SNOY first commercialized it, so far man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/36B82Y30/00B82Y40/00
CPCH01M4/366H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 张联齐梁鸣张洪周宋大卫时喜喜
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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