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Template process coated lithium titanate material and preparation method thereof

A technology of lithium titanate and template method is applied in the field of template method coated lithium titanate material and its preparation, which can solve problems such as serious flatulence problem, and achieve the effect of reducing gas production behavior and improving electrical conductivity.

Inactive Publication Date: 2018-08-03
茆胜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Batteries using lithium titanate as the negative electrode can have high safety, excellent cycle performance and rate performance, but the problem of flatulence in lithium titanate batteries is more serious, mainly because the Ti in lithium titanate 3+ Side reaction with electrolyte: Ti 3+ +H + → Ti 4+ +H 2

Method used

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  • Template process coated lithium titanate material and preparation method thereof
  • Template process coated lithium titanate material and preparation method thereof
  • Template process coated lithium titanate material and preparation method thereof

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preparation example Construction

[0029] refer to figure 1 , the preparation method of the lithium titanate material coated by the template method of the present invention may comprise the following steps:

[0030] S1. Add lithium titanate into the solvent and stir evenly to form a first solution.

[0031] Wherein, the solvent may be deionized water or an alcohol or ether organic solvent; the organic solvent may be one or more mixtures of ethanol, ethylene glycol, anisole, and the like. In the formed first solution, the solid content is 5%-30% (mass percentage).

[0032] S2. After dissolving the carbon source in the solvent, add it into the first solution, and stir evenly to form the second solution.

[0033] Stirring time is 3~6h.

[0034] The carbon source can be one or more mixtures of glucose, citric acid, phenolic resin, pitch, etc. The solvent is one or more mixtures of deionized water, ethanol and tetrahydrofuran.

[0035] In the second solution, the solid content is 5% to 50% (mass percentage); wh...

Embodiment 1

[0047] Preparation of lithium titanate material coated by template method:

[0048] (1) Add 30 g of lithium titanate to 150 mL of deionized water, and stir for 1 h;

[0049] (2) Dissolve 7.5g of citric acid in 30mL of deionized water, and add it into the solution of step (1), and mix and stir for 4h;

[0050] (3) Add 60 g of sodium chloride to the solution of step (2), continue stirring for 1 hour, then add 15 grams of polyvinylpyrrolidone, and after stirring for 1 hour, put the solution into a refrigerator at minus 20° C. for 24 hours;

[0051] (4) freeze-drying the frozen product of step (3);

[0052] (5) putting the freeze-dried product of step (4) into a high-temperature sintering furnace with a temperature of 800° C. and protected by an argon atmosphere for calcination for 3 hours;

[0053] (6) Wash the calcined product in step (5), filter it with suction, and dry it in vacuum at 60°C to obtain the coated lithium titanate material, whose structure is as follows: figure...

Embodiment 2

[0062] Preparation of lithium titanate material coated by template method:

[0063] (1) Add 30 g of lithium titanate material to 150 mL of deionized water, and stir for 1 h;

[0064] (2) Dissolve 7.5g of glucose in 30mL of deionized water, add it to the solution in step (1), and mix and stir for 4 hours;

[0065] (3) Add 60 g of sodium chloride to the solution of step (2), continue stirring for 1 hour, then add 15 grams of polyvinylpyrrolidone, and after stirring for 1 hour, put the solution into a refrigerator at minus 20° C. for 24 hours;

[0066] (4) freeze-drying the frozen product of step (3);

[0067] (5) putting the freeze-dried product of step (4) into a high-temperature sintering furnace with a temperature of 900° C. and protected by an argon atmosphere for calcination for 3 hours;

[0068] (6) The calcined product in step (5) is washed with water, filtered with suction, and vacuum-dried at 60° C. to obtain the coated lithium titanate material.

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Abstract

The invention discloses a template process coated lithium titanate material and a preparation method thereof. The preparation method comprises the following steps: S1, adding lithium titanate to a solvent, and uniformly stirring the lithium titanate and the solvent to form a first solution; S2, dissolving a carbon source in a solvent, adding the obtained solution to the first solution, and stirring the obtained solution to form a second solution; S3, adding sodium chloride to the second solution, uniformly stirring the sodium chloride and the second solution, adding polyvinylpyrrolidone, and freezing the obtained solution; S4, lyophilizing a product obtained in step S3; S5, performing heat treatment on a product obtained in step S4 in an inert gas atmosphere at a temperature of 700-1000 DEG C; and S6, performing water washing, suction filtration and vacuum drying on a product obtained in step S5 to obtain the template process coated lithium titanate material. The surface coating is performed to make the surface of the lithium titanate coated with carbon, so the conductivity of the material is improved; and the lithium chloride is used as a template, and the lithium titanate material enters the hexahedral crystal structure of the sodium chloride at a low temperature to make the carbon material closely wrapped, so direct contact between the lithium titanate material and an electrolyte is avoided, and the gas production behavior is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a lithium titanate material coated by a template method and a preparation method thereof. Background technique [0002] Based on the "rocking chair" principle, lithium-ion batteries are not only the main energy supply equipment for portable electronic products, but also It has been widely used in the fields of power industry, aerospace and weaponry, and has become the most important secondary chemical power source. With the subdivision of the field of use, the corresponding lithium-ion batteries also need to have corresponding characteristics that meet the requirements. [0003] For large-scale electric transportation vehicles, such as buses, freight vehicles, logistics vehicles, etc., lithium-ion batteries used in them need to have excellent safety performance, cycle performance and high-current charge and discharge performance. At present, the lithium-io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 茆胜
Owner 茆胜