Enhanced-type composite adhesive of lithium ion battery, preparation method and application thereof

A technology for composite binders and lithium-ion batteries, which is applied in the direction of non-polymer binder additives, binder types, cellulose binders, etc., can solve problems that do not consider the binding force of binders and active materials, and the environment. Influence and other issues, to achieve the effect of improving cycle stability, preventing volume expansion, and improving conductivity

Inactive Publication Date: 2015-02-04
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the binding force between the binder and the active material is not considered, there is still room for improvement in its

Method used

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  • Enhanced-type composite adhesive of lithium ion battery, preparation method and application thereof
  • Enhanced-type composite adhesive of lithium ion battery, preparation method and application thereof
  • Enhanced-type composite adhesive of lithium ion battery, preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0026] The lithium-ion battery-enhanced composite adhesive in this embodiment is composed of 0.01 g of carboxyl-functionalized carbon nanotubes and 0.1 g of sodium alginate.

[0027] The preparation method of carboxyl functionalized carbon nanotubes in this embodiment comprises the following steps:

[0028] (1) Prepare 120mL of mixed solution of concentrated sulfuric acid and concentrated nitric acid, the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 3:1;

[0029] (2) Add 3g of carbon nanotubes to the mixture, ultrasonicate for 8 hours at a frequency of 22kHz and a power of 500W, then stir and reflux at 120°C for 2 hours, remove the supernatant after centrifuging the obtained solution, and add deionized water to shake After uniformity, centrifuge again, repeat the operation until the pH value of the supernatant is greater than 6.5, and vacuum-dry at 120°C to obtain the final product.

[0030] The preparation method of lithium-ion battery-enhanced ...

Embodiment 2

[0038] The lithium-ion battery-enhanced composite adhesive in this example is composed of 0.1 g of carboxy functionalized carbon nanotubes and 0.1 g of carboxymethyl chitosan.

[0039] The preparation method of carboxyl functionalized carbon nanotubes in this embodiment comprises the following steps:

[0040] (1) Prepare 120mL of mixed solution of concentrated sulfuric acid and concentrated nitric acid, the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 3:2;

[0041] (2) Add 3g of carbon nanotubes to the mixture, ultrasonicate for 6 hours at a frequency of 22kHz and a power of 500W, then stir and reflux at 60°C for 12 hours, remove the supernatant after the obtained solution is centrifuged, and add deionized water to shake After uniformity, centrifuge again, repeat the operation until the pH value of the supernatant is greater than 6.5, and vacuum-dry at 120°C to obtain the final product.

[0042] The preparation method of lithium-ion battery-enhan...

Embodiment 3

[0050] The lithium-ion battery-enhanced composite binder in this embodiment is composed of 0.05 g of carboxyl-functionalized carbon nanotubes and 0.1 g of sodium carboxymethyl cellulose.

[0051] The preparation method of carboxyl functionalized carbon nanotubes in this embodiment comprises the following steps:

[0052] (1) Prepare 120mL of mixed solution of concentrated sulfuric acid and concentrated nitric acid, the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 2:1;

[0053] (2) Add 2g of carbon nanotubes to the mixture, ultrasonicate for 24 hours at a frequency of 22kHz and a power of 500W, then stir and reflux at 80°C for 10 hours, remove the supernatant after the obtained solution is centrifuged, and add deionized water to shake After uniformity, centrifuge again, repeat the operation until the pH value of the supernatant is greater than 6.5, and vacuum-dry at 120°C to obtain the final product.

[0054] The preparation method of lithium-ion b...

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Abstract

The invention discloses an enhanced-type composite adhesive of a lithium ion battery, a preparation method and an application thereof and belongs to the technical field of lithium ion battery adhesives. In the enhanced-type composite adhesive, a carboxyl group on a carboxyl-functionalized carbon nanotube can be condensed with groups, such as a hydroxyl group and the like, in a water-soluble high-molecular compound to form a bond for forming the enhanced-type composite adhesive. The enhanced-type composite adhesive has following three advantages: (1) the enhanced-type composite adhesive is greatly enhanced in tensile strength; (2) by means of a three-dimensional electric-conductive network formed by the carbon nanotube, the enhanced-type composite adhesive is effectively improved in electric-conductivity; and (3) the enhanced-type composite adhesive contains a special functional group which can be bonded with an electrode active material and is beneficial to ion transmission and tight combination between the composite adhesive and the active material can be maintained even a large size change is generated in the active material, so that a powder-falling phenomenon caused by volume expansion during a charging and discharging process can be prevented and cycling stability of the electrode active material is improved.

Description

technical field [0001] The invention relates to a lithium-ion battery reinforced composite adhesive, a preparation method and application of the composite adhesive, and belongs to the technical field of lithium-ion battery adhesives. Background technique [0002] With the development of portable electronic devices and electric vehicles, the energy density of lithium-ion batteries is increasingly demanding. In order to achieve the purpose of increasing the energy density of lithium-ion batteries, key materials such as positive electrodes, negative electrodes, separators, and electrolytes need to be improved. In terms of negative electrodes, traditional graphite materials cannot meet the requirements of the new generation of lithium-ion batteries due to their low theoretical mass specific capacity (375mA h / g). New anode materials with high specific capacity have gradually attracted the attention of the majority of researchers, but such materials are often accompanied by large...

Claims

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Application Information

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IPC IPC(8): C09J105/04C09J105/08C09J101/28C09J103/08C09J11/04C09C1/44C09C3/06H01M4/62
CPCY02E60/10
Inventor 岳红云孙志贤曹朝霞董红玉尹艳红杨书廷
Owner HENAN NORMAL UNIV
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