Graphene polyaniline composite and preparation method thereof, and lithium ion battery

A composite material and graphene technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve problems such as improvement, lack of adhesion, and unfavorable energy density of electrode sheets

Inactive Publication Date: 2013-06-19
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The conductive agents used in traditional electrode sheets are mainly materials such as carbon black, carbon nanotubes, or carbon fibers. These materials have good electrical conductivity, but they do not have adhesive properties. The conductivity of the mixture is relatively poor, which is not conducive to the improvement of the energy density of the electrode sheet, and the capacity of the battery is also limited.

Method used

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  • Graphene polyaniline composite and preparation method thereof, and lithium ion battery
  • Graphene polyaniline composite and preparation method thereof, and lithium ion battery
  • Graphene polyaniline composite and preparation method thereof, and lithium ion battery

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preparation example Construction

[0028] In addition, this embodiment also provides a preparation method of graphene-polyaniline composite material, such as image 3 shown, including the following steps:

[0029] Step S1: dissolving graphite oxide in water and ultrasonically dispersing to prepare graphene oxide suspension.

[0030] Wherein, the concentration of the graphene oxide suspension is controlled at 0.1-1g / L.

[0031] Further, the graphite oxide in this step is preferably prepared in the following steps:

[0032] Add graphite raw materials, potassium persulfate and phosphorus pentoxide to concentrated sulfuric acid at 80°C, stir evenly, cool for more than 6 hours, filter with suction, wash until neutral, and dry to obtain a mixed sample; then add the mixed sample to 0 In the concentrated sulfuric acid at ℃, add potassium permanganate, keep the temperature of the system below 20 ℃, then keep it in an oil bath at 35 ℃ for 30 minutes, then slowly add deionized water, and then add hydrogen peroxide solut...

Embodiment 1

[0044] The technological process of the graphene-polyaniline composite material of the present embodiment is as follows:

[0045]Graphite → graphite oxide → graphene oxide polyaniline composite → graphene polyaniline composite

[0046] (1) Graphite: 50 mesh natural flake graphite with a purity of 99.5%.

[0047] (2) Graphite oxide: Add 20g of graphite, 10g of potassium persulfate and 10g of phosphorus pentoxide into concentrated sulfuric acid at 80°C, stir evenly, cool for more than 6 hours, filter with suction, wash until neutral, and dry to obtain a mixed sample;

[0048] Add the dried mixed sample to 230mL of concentrated sulfuric acid at 0°C, then add 60g of potassium permanganate, keep the temperature of the system below 20°C, then keep it in an oil bath at 35°C for 2 hours, then slowly add 920mL Deionized water;

[0049] After 15 minutes, add 2.8L of deionized water to the system until the color of the mixture turns bright yellow, filter while hot, then wash with 5L of...

Embodiment 2

[0056] (1) Graphite: 50 mesh natural flake graphite with a purity of 99.5%.

[0057] (2) Graphite oxide: Add 20g of graphite, 10g of potassium persulfate and 10g of phosphorus pentoxide into concentrated sulfuric acid at 80°C, stir evenly, cool for more than 6 hours, filter with suction, wash until neutral, and dry to obtain a mixed sample;

[0058] Add the dried mixed sample to 230mL of concentrated sulfuric acid at 0°C, then add 60g of potassium permanganate, keep the temperature of the system below 20°C, then keep it in an oil bath at 35°C for 2 hours, then slowly add 920mL Deionized water;

[0059] After 15 minutes, add 2.8L of deionized water to the system until the color of the mixture turns bright yellow, filter while hot, then wash with 5L of 10% hydrochloric acid, filter with suction, and dry in vacuum at 60°C for 48 hours That is to obtain graphite oxide, wherein the above-mentioned 2.8L deionized water contains 50mL of 30% hydrogen peroxide.

[0060] (3) Graphene ...

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Abstract

The invention relates to a graphene polyaniline composite and a preparation method and application thereof. The composite comprises graphene and polyaniline, wherein polyaniline is dispersed on a layered structure of graphene, and mass percentage of graphene in the composite is 10 to 80%. The graphene polyaniline composite prepared by using the preparation method has a dendritic structure, which enables the purpose of bonding of electrode materials to be achieved; due to existence of graphene, the composite can be used as a conductive agent, so usage of a traditional binder and a tradition conductive agent can be avoided when the composite is applied in fabrication of electrode slices, and thus specific capacity of the electrode slices is substantially improved and energy density of the electrode slices is high.

Description

【Technical field】 [0001] The invention relates to the field of lithium battery electrode materials, in particular to a graphene polyaniline composite material, a preparation method thereof, and a lithium ion battery. 【Background technique】 [0002] With the development of various new energy sources, the miniaturization of portable electronic equipment and the wide application of electric vehicles, there is a wide demand for large-capacity and high-power chemical power supplies. At present, most of the electrode sheets of commercialized lithium-ion batteries are prepared by mixing electrode materials, conductive agents and binders together under the condition of a solvent. Big restrictions. Therefore, the development of new conductive agents and adhesives has received extensive attention. [0003] The conductive agents used in traditional electrode sheets are mainly materials such as carbon black, carbon nanotubes, or carbon fibers. These materials have good electrical cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCY02E60/10
Inventor 周明杰王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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