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Carbon nanotube coating aluminum foil for power battery and preparation method of carbon nanotube coating aluminum foil

A technology of carbon nanotubes and power batteries, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problem of poor adhesion between positive electrode active materials and aluminum foil, and large DC internal resistance of soft-pack lithium batteries , high current discharge ability and other problems, to achieve the effect of improving the adhesion, increasing the electronic conductive channel and interface contact area, and reducing the DC internal resistance

Inactive Publication Date: 2016-04-06
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the following technical problems: the DC internal resistance of the soft pack lithium battery is too large; the positive electrode active material has poor adhesion to the aluminum foil; the large current discharge capacity is weak; the low temperature performance is poor, and a carbon nanotube for power battery is provided. coated aluminum foil

Method used

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  • Carbon nanotube coating aluminum foil for power battery and preparation method of carbon nanotube coating aluminum foil
  • Carbon nanotube coating aluminum foil for power battery and preparation method of carbon nanotube coating aluminum foil
  • Carbon nanotube coating aluminum foil for power battery and preparation method of carbon nanotube coating aluminum foil

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Effect test

Embodiment 1

[0030] A preparation method of carbon nanotube-coated aluminum foil for a power battery, the method steps are as follows:

[0031] a. Slurry preparation: according to the ratio shown in Table 1, add the solvent, binder, dispersant, and carbon nanotube powder into the double planetary dispersing equipment in order for mixing and dispersing, and the dispersing time is 2h to 4h; The solvent is nitrogen methyl pyrrolidone, the dispersant is dispersant C500, and the binder is polyvinylidene fluoride;

[0032] b. Slurry performance test: Sampling at the discharge port every 30 minutes, measure the particle size distribution, viscosity, solid content of the slurry and analyze its stability. The viscosity of the slurry does not change more than 5% within 48 hours, and the solid content Enter the next process after the change does not exceed 0.5% within 48 hours;

[0033] c. Coating and drying: Put the above slurry into a high-precision lithium battery coating machine, and the coating...

Embodiment

[0037] Example: Application of a positive carbon nanotube-coated current collector in lithium batteries

[0038] The positive active material is nano LiFePO 4 coated LiNi 0.5 co 0.2 mn 0.3 o 3 (coating amount 10-20%), the positive electrode conductive agent is Super-P, the positive electrode binder is polyvinylidene fluoride; the negative electrode active material is artificial graphite, the negative electrode conductive agent is Super-P, and the negative electrode binder is butyl styrene Rubber, the negative electrode thickener is sodium carboxymethyl cellulose, the positive electrode current collector is the above-mentioned carbon nanotube coated aluminum foil, and the negative electrode current collector is double-light copper foil. The electrolyte is a combined solvent system of ethylene carbonate, propylene carbonate and dimethyl carbonate added with lithium hexafluorophosphate. Separator is Al 2 o 3 Coated with PE diaphragm. The battery cell adopts a Z-shaped lam...

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Abstract

The invention relates to an aluminum film of a power battery, and in particular to a carbon nanotube coating aluminum foil for the power battery and a preparation method of the carbon nanotube coating aluminum foil. In the carbon nanotube coating aluminum foil for the power battery, a carbon nanotube paste is uniformly applied onto the surface of the metal aluminum foil and then dried to obtain a composite aluminum foil serving as a positive electrode current collector for use. Since the surface of the coating aluminum foil is provided with a plurality of conductive carbon nanotubes, the contact area of the carbon nanotube coating aluminum foil with positive electrode particles is larger, a carbon-carbon material is more easy to bond, the conductive passages are abundant, thus, the bonding force between a positive electrode and the current collector is effectively increased, and the internal resistance of the battery is reduced.

Description

technical field [0001] The invention relates to an aluminum foil for a power battery, in particular to a carbon nanotube-coated aluminum foil for a power battery and a preparation method thereof. Background technique [0002] In the structure of lithium batteries, aluminum foil is one of the important inner layer components. Its surface properties affect the interface structure and internal resistance of the positive electrode, and directly affect the rate performance, capacity performance, cycle performance and other characteristics of the battery. In the current power battery industry, non-coated double-gloss aluminum foil is generally used as the positive electrode current collector. The specific structure of the positive electrode is as follows: figure 1 shown. [0003] The positive active material is generally made of lithium iron phosphate (average particle size 2-10μm, specific surface area 10-20m 2 / g), ternary materials (average particle size 8μm~16μm, specific su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/661H01M4/663H01M4/667Y02E60/10
Inventor 李凡群韩笑朱修锋饶绍建
Owner WANXIANG 123 CO LTD
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