A kind of fluorinated graphene modified lithium titanate material and its preparation and application

A technology of fluorinated graphene and lithium titanate, applied in electrochemical generators, structural parts, electrical components, etc., can solve battery flatulence, restrict large-scale commercial application of lithium titanate, poor electronic conductivity of lithium titanate, etc. problem, to achieve the effect of improving the rate performance, eliminating the surface defects of lithium titanate, and reducing the resistance of electron conduction

Active Publication Date: 2021-05-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although lithium titanate has great technical advantages, the main reason that restricts the further large-scale commercial application of lithium titanate is that during the recharge and discharge process, lithium titanate catalyzes the decomposition of the electrolyte, resulting in battery flatulence.
In addition, when applied to lithium-ion supercapacitors, the poor electronic conductivity of lithium titanate is also one of the factors restricting the application, and it needs to be mixed with a large number of conductive materials.

Method used

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  • A kind of fluorinated graphene modified lithium titanate material and its preparation and application

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Experimental program
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Effect test

Embodiment 1

[0024] After mixing lithium acetate 10g, ethanol 45g, acetic acid 2g, fluorinated graphene (F / C ratio is 1.1, 5 layers) 2g, and water 0.5g until uniform, slowly add 50g tetrabutyl titanate, after stirring for 5 hours, The liquid was evaporated to dryness to obtain an intermediate phase. Then calcined at 600°C for 8 hours under argon atmosphere, and made into powder material after cooling.

[0025] The above materials were subjected to elemental analysis, wherein the mass fraction of carbon element accounted for 10%, the mass fraction of fluorine element accounted for 5%, and the rest was lithium titanate.

[0026] The above materials were tested by XPS and peaks were divided. Among them, 684.8e V belonged to Ti-F bond, 686.6e V belonged to C-F bond, and 685.7e V belonged to C-F-Ti bond. Contains C-F-Ti bonds, Ti-F bonds, and C-F bonds. These bonds are conducive to the compound lithium titanate and fluorinated graphene on the atomic scale to greatly reduce the electron conduct...

Embodiment 2

[0037] After mixing 10 g of lithium acetate, 60 g of methanol, 3 g of acetic acid, 3 g of fluorinated graphene (F / C ratio of 1.2, 4 layers), and 0.3 g of water until uniform, slowly add 100 g of tetrapropyl titanate and stir for 4.5 hours, The liquid was evaporated to dryness to obtain an intermediate phase. Then calcined at 800°C for 68 hours under nitrogen atmosphere, and made into powder material after cooling.

[0038] The above materials are used for electrode preparation and battery testing. The conditions for electrode preparation and battery testing are shown in the table.

Embodiment 3

[0040] Lithium acetate 10g, isopropanol 80g, acetic acid 2.7g, fluorinated graphene (F / C ratio is 1.1, 5 layers) 3g, after water 0.3g are mixed uniformly, slowly add 12g tetrabutyl titanate, stir 3 After 1 hour, the liquid was evaporated to dryness to obtain an intermediate phase. Then it was calcined at 500°C for 10 hours under an argon atmosphere, and it was cooled to make a powder material.

[0041] The above materials are used for electrode preparation and battery testing. The conditions for electrode preparation and battery testing are shown in the table.

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Abstract

The invention provides a fluorinated graphene modified lithium titanate material and a preparation method thereof. A fluorinated graphene-modified lithium titanate material, which is composed of fluorinated graphene and lithium titanate; the mass fraction of lithium titanate in the overall material is 55%-98%, and the better one is 62%- 97%, optimally 70%‑94%. The surface of the material contains C‑F‑Ti bonds and F‑Ti bonds; lithium titanate accounts for 55%‑98% of the overall material, carbon accounts for 1%‑25% of the overall material, and fluorine accounts for the overall The mass fraction of the material is 0.2%-20%; better: the mass fraction of lithium titanate in the overall material is 62%-97%, the mass fraction of carbon element in the overall material is 2%-20%, and the fluorine element accounts for the overall material The mass fraction of lithium titanate is 0.5%-18%; optimal: lithium titanate accounts for 70%-94% of the overall material, carbon accounts for 5%-18% of the overall material, and fluorine accounts for 70%-94% of the overall material. The mass fraction is 0.8%‑15%.

Description

technical field [0001] The invention relates to the fields of lithium ion batteries and lithium ion supercapacitors, in particular to a modified lithium titanate negative electrode and a preparation method thereof. Background technique [0002] As a zero-strain material, lithium titanate hardly changes in volume during charging and discharging, which can avoid capacity attenuation caused by volume change and has a long cycle life. Therefore, lithium titanate is used as a lithium-ion power battery, lithium-ion Anode materials for supercapacitors have great research value and commercial application prospects. [0003] Although lithium titanate has great technical advantages, the main reason that restricts the further large-scale commercial application of lithium titanate is that during the recharge and discharge process, lithium titanate catalyzes the decomposition of the electrolyte, resulting in battery flatulence. In addition, when applied to lithium-ion supercapacitors, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 曲超张洪章李先锋张华民刘翠连
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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