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A kind of composition slurry, its preparation method and its application

A technology of composition and slurry, which is applied in the direction of electrode manufacturing, active material electrodes, structural parts, etc., can solve the problem that carbon nanotubes cannot transport electrons, etc.

Inactive Publication Date: 2011-12-14
海宁市盐官工业投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Both of the above two inventions prepare conductive substrates (i.e. electrodes) by doping carbon nanotubes with alkali metals. This method simply mixes carbon nanotubes into negative electrode materials, and carbon nanotubes cannot be used for transportation. electrons, thus only partially improving the high-temperature storage performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The weight ratio of each component of composition slurry:

[0029] Carbon nanotubes with an outer diameter of 10-25nm 5 Polytetrafluoroethylene 1 Deionized water 40

[0030] Preparation method of composition slurry:

[0031] The method is to mix and stir carbon nanotubes, water-based binder polytetrafluoroethylene and deionized water for 2 hours;

[0032] A method for preparing a low polarization impedance electrode using the above composition slurry:

[0033] After baking the graphite negative electrode sheet of the battery after drawing the pulp at 70°C for 10 minutes, coat the surface with the composition slurry with a thickness of 10 microns, and then bake it at 110°C for 5 minutes, and then make Sheet, winding, liquid injection, formation, sealing.

[0034] The low polarization impedance electrode and the positive electrode of the battery are prepared into a battery by a conventional method.

Embodiment 2

[0036] The weight ratio of each component of composition slurry:

[0037] Carbon nanotubes with an outer diameter of 15-40nm 11 carboxymethylpropyl cellulose 1 deionized water 50

[0038] Preparation method of composition slurry:

[0039] The method is to mix and stir carbon nanotubes, water-based binder carboxymethylpropyl cellulose and deionized water for 1.5 hours;

[0040] A method for preparing a low polarization impedance electrode using the above composition slurry:

[0041] After baking the graphite negative electrode sheet of the battery after drawing the slurry at 90°C for 5 minutes, coat the surface with the composition slurry with a thickness of 5 microns, and then bake it at a temperature of 110°C for 5 minutes, and then prepare Sheet, winding, liquid injection, formation, sealing.

[0042] The low polarization impedance electrode and the positive electrode of the battery are prepared into a battery by a conventional method.

Embodiment 3

[0044] The weight ratio of each component of composition slurry:

[0045] Carbon nanotubes with an outer diameter of 20-100nm 8 Polyvinyl alcohol 1 Deionized water 30

[0046] Preparation method of composition slurry:

[0047] The method is to mix and stir carbon nanotubes, water-based adhesive polyvinyl alcohol and deionized water for 3 hours;

[0048] A method for preparing a low polarization impedance electrode using the above composition slurry:

[0049]After baking the graphite negative electrode sheet of the battery after drawing the slurry at 60°C for 15 minutes, coat the surface with the composition slurry with a thickness of 20 microns, and then bake it at a temperature of 105°C for 8 minutes, and then prepare Sheet, winding, liquid injection, formation, sealing.

[0050] The low polarization impedance electrode and the positive electrode of the battery are prepared into a battery by a conventional method.

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Abstract

The invention discloses composite slurry for reducing battery polarization resistance, a manufacturing method and the application thereof. The composite slurry comprises a carbon nano tube, a water system binding agent and water; the composite slurry is mixed and stirred for 1-4 hours and is coated on the cathode of the battery. The composite slurry has the advantages of simple preparation process and capability of greatly reducing the resistance after the battery electrode is stored at a high temperature, belonging to the field of lithium secondary battery electrodes.

Description

technical field [0001] The invention relates to a composition slurry for lithium secondary battery electrodes, in particular to a composition slurry for reducing battery polarization resistance. The present invention also relates to the preparation method and application of the composition paint. Background technique [0002] Lithium-ion batteries can be widely used in digital products, mobile phones, electric vehicles and other electronic products. Lithium-ion batteries are prone to electrode polarization in high-temperature environments, resulting in loss of battery capacity, which affects the application of electronic products in high-temperature environments and causes great troubles to users. Therefore, how to reduce the polarization impedance of lithium-ion batteries under high-temperature environment has become an urgent problem to be solved by various battery manufacturers. [0003] The main method of researching the high-temperature storage performance of lithium-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/58H01M4/62H01M4/04H01M4/02
CPCY02E60/12Y02E60/10
Inventor 司雷陆银锋渠冰
Owner 海宁市盐官工业投资有限公司