Graphene composite material for cathode of lithium ion battery and preparation method of graphene composite material

A lithium-ion battery, graphene-based material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large volume change, low capacity attenuation, small structural change, etc., and achieve simple preparation process and excellent electrical conductivity. , the effect of low price

Active Publication Date: 2012-09-19
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the shortcomings of the negative electrode materials of lithium ion batteries in the prior art, such as low capacitance, poor cycle performance, serious capacity attenuation, and large volume change during charging and discharging, the invention discloses a graphene composite material for lithium ion battery negative electrodes. The material, which combines gra

Method used

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  • Graphene composite material for cathode of lithium ion battery and preparation method of graphene composite material
  • Graphene composite material for cathode of lithium ion battery and preparation method of graphene composite material
  • Graphene composite material for cathode of lithium ion battery and preparation method of graphene composite material

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Embodiment 1

[0056] 1. Preparation of titanium dioxide / graphene composite material:

[0057] (1) Weigh 1.0g of graphene three-dimensional derivative material (the surface has a large number of micropores with a pore size ranging from 2nm to 100nm), add it to 50ml of concentrated sulfuric acid, slowly add 3.5g of potassium permanganate under stirring, and stir at room temperature for reaction After 0.5 hours, slowly add 100ml of deionized water, dropwise add hydrogen peroxide until no bubbles are generated, filter and wash with deionized water until neutral, and dry to obtain a three-dimensional graphene oxide derivative material. The three-dimensional graphene oxide derivative material obtained by drying is dissolved in an aqueous solution, and an aqueous solution of the three-dimensional graphene oxide derivative material with stable dispersion is obtained by ultrasonication.

[0058] (2) Add titanium tetrachloride to the suspension obtained in step (1) according to the mass ratio of tita...

Embodiment 2

[0062] 1. Preparation of titanium dioxide / graphene composite material:

[0063] (1) Weigh 5.0g of graphene three-dimensional derivative material (its conductivity is greater than 100mS / m), add it to 100ml of concentrated sulfuric acid, slowly add 17.5g of potassium permanganate under stirring, stir at room temperature for 1.5 hours, then slowly add 300ml deionized water, add hydrogen peroxide dropwise until no bubbles are generated, filter and wash with deionized water until neutral, and dry to obtain a three-dimensional graphene oxide derivative material. Dissolving the three-dimensional graphene derivative material obtained by drying in an aqueous solution, and ultrasonically obtaining a dispersed and stable graphene three-dimensional derivative material aqueous solution.

[0064] (2) Add titanium tetrachloride to the suspension obtained in step (1) according to the mass ratio of titanium tetrachloride and graphene oxide of 1:5, and hydrolyze at 60° C. for 2 hours to obtain ...

Embodiment 3

[0067] 1. Preparation of titanium dioxide / graphene composite material:

[0068] (1) Weigh 1.0g of graphene three-dimensional derivative material (its conductivity is greater than 100mS / m), add it to 50ml of concentrated sulfuric acid, slowly add 4g of potassium chromate under stirring, stir and react at room temperature for 5 hours, then slowly add 100ml to remove Ionized water, add hydrogen peroxide dropwise until no bubbles are generated, filter and wash with deionized water until neutral, and dry to obtain a three-dimensional graphene oxide derivative material. Dissolving the three-dimensional graphene derivative material obtained by drying in an aqueous solution, and ultrasonically obtaining a dispersed and stable graphene three-dimensional derivative material aqueous solution.

[0069] (2) Add titanium tetrachloride to the suspension obtained in step (1) according to the mass ratio of titanium tetrachloride and graphene oxide of 1:5, and hydrolyze at 60° C. for 2 hours to...

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Abstract

The invention relates to a graphene composite material for a cathode of a lithium ion battery and a preparation method of the graphene composite material, belonging to the technical field of preparation of the electrodes of the lithium ion batteries. The preparation method of the graphene composite material for the cathode of the lithium ion battery comprises the steps of: oxidizing and ultrasonically dispersing a graphene material in a concentrated acid environment, then mixing the obtained graphene material with a titanium source, and drying and calcining an obtained mixture to obtain the graphene composite material. The graphene composite material for the cathode of the lithium ion battery, provided by the invention, is high in electric conductivity; an obtained electrode slice is low in resistance and has structural stability in a charge/discharge process; and the prepared lithium ion secondary battery is high in capacity, good in safety, favorable in cyclic performance and long in service life.

Description

technical field [0001] The invention relates to a composite material for lithium-ion battery negative electrodes and a preparation method thereof, and further relates to a graphene composite material for lithium-ion battery negative electrodes and a preparation method thereof, belonging to the technical field of lithium-ion battery electrode preparation. Background technique [0002] Lithium-ion batteries have been widely used since their commercialization due to their high energy density and good cycle performance. Especially with the rapid development of hybrid electric vehicles and electric vehicles, lithium-ion batteries, as an important energy storage device, have received more and more attention. The negative electrode of lithium-ion battery is an important part of the battery, and its structure and performance directly affect the capacity and cycle performance of lithium-ion batteries. At present, graphite is the main anode material for commercial lithium-ion batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/48
CPCY02E60/12H01M4/133H01M4/1393H01M4/587H01M4/36H01M10/0525Y02E60/10
Inventor 丁兆龙王振中
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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