Preparation method of alumina coated lithium titanate

A technology of lithium titanate and alumina, which is applied in the direction of electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of lithium titanate flatulence and other problems, achieve the effects of reducing water absorption, improving flatulence problems, and reducing decomposition

Active Publication Date: 2015-08-19
HUNAN RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of aluminum oxide-coated lithium titanate, to solve the technical problem of lithium titanate inflating during the preparation of the battery

Method used

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  • Preparation method of alumina coated lithium titanate
  • Preparation method of alumina coated lithium titanate
  • Preparation method of alumina coated lithium titanate

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preparation example Construction

[0037] refer to figure 1 , a preferred embodiment of the present invention provides a method for preparing alumina-coated lithium titanate, comprising the following steps:

[0038] S102: Mix and react the aluminum salt, lithium titanate, the first alcoholic solvent and the dispersant, and dry in vacuum to obtain a lithium titanate precursor coated with the aluminum salt; the mass ratio of lithium titanate to the first alcoholic solvent is 1 :0.5~1:4.

[0039] S104: Sintering and cooling the aluminum salt-coated lithium titanate precursor to obtain aluminum oxide-coated lithium titanate.

[0040] During the mixing process, the first alcohol solvent is used as a dispersion medium, which can promote the dispersion of the aluminum salt and lithium titanate, avoid agglomeration, and make the aluminum salt and lithium titanate fully contact, so as to accelerate the reaction speed. Due to the low boiling point of the alcohol solvent, it volatilizes quickly during the vacuum drying ...

Embodiment 1

[0056] Add 100g of aluminum sulfide to 400g of ethanol solution, and grind in a sand mill until the D50 (median particle size) is 0.5um to obtain a suspension of aluminum sulfide in ethanol solution.

[0057] Add 1000g of lithium titanate with a particle size of 6 microns, 500g of ethanol solution and 2g of polyammonium methacrylate into the dispersion mixing tank of the multifunctional coating mixer, stir to form a lithium titanate suspension, and then add the ethanol solution of aluminum sulfide Suspension. After stirring and reacting for 30 minutes, vacuum drying was carried out at 0.4 MPa and 50° C. to obtain an aluminum salt-coated lithium titanate precursor. Condensed ethanol is recovered at the receiving tank.

[0058] The aluminum salt-coated lithium titanate precursor was sintered at 300° C. for 10 h, and then aluminum oxide-coated lithium titanate was obtained after cooling.

Embodiment 2

[0060] Add 100g of aluminum isopropoxide into 1000g of ethanol solution, and grind in a sand mill until the D50 is 0.5um to obtain a suspension of aluminum isopropoxide in ethanol solution.

[0061] Add 3000g of lithium titanate with a particle size of 30 microns, 6000g of isopropanol solution and 15g of polyammonium methacrylate into the dispersion mixing tank of the multifunctional coating mixer, stir to form a lithium titanate suspension, and then add isopropanol Aluminum suspension in ethanol. After stirring and reacting for 40 minutes, it was vacuum-dried at 0.6 MPa and 60° C. to obtain a lithium titanate precursor coated with aluminum salt. Condensed ethanol is recovered at the receiving tank.

[0062] The aluminum salt-coated lithium titanate precursor was sintered at 400° C. for 15 hours, cooled and sieved to remove iron to obtain aluminum oxide-coated lithium titanate.

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Abstract

The invention discloses a preparation method of alumina coated lithium titanate. The method comprises the following steps of 1) mixing aluminum salt, lithium titanate, a first alcohol solvent and a dispersing agent to react and performing vacuum drying to obtain an aluminum salt coated lithium titanate precursor, wherein a mass ratio of lithium titanate to the first alcohol solvent is (1:0.5)-(1:4); and 2) sintering and cooling the aluminum salt coated lithium titanate precursor to obtain alumina coated lithium titanate. The aluminum salt is sufficiently and uniformly mixed with lithium titanate under the action of the first alcohol solvent and the dispersing agent, and an alumina film formed on the surface of lithium titanate is moderate in thickness, small in particle size and uniform, so that prepared alumina coated lithium titanate reduces the water absorption of lithium titanate, reduces a decomposition effect of a Ti-O bond on an electrolyte, does not react with the electrolyte under overpotential, and improves inflation of a lithium titanate battery.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a preparation method of alumina-coated lithium titanate. Background technique [0002] Lithium-ion batteries, also known as rocking chair batteries, store and release energy through the deintercalation of lithium ions between the positive and negative electrode materials. Lithium-ion batteries have the advantages of light weight, large capacity, no memory effect, and environmental protection. Many digital devices now use lithium-ion batteries as power sources. In lithium-ion batteries, the positive electrode material, negative electrode material and electrolyte are the main aspects that affect the performance of lithium-ion batteries. At present, the research and development of lithium-ion battery negative electrodes mainly focus on carbon materials and metal oxides with special structures. Because the graphite negative electrode has good conductivity and high crystalli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M10/0525H01M4/36
CPCH01M4/366H01M4/485H01M10/0525Y02E60/10
Inventor 公伟伟宋文锋池田一崇陈敏宋振伟黄海翔
Owner HUNAN RESHINE NEW MATERIAL
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