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Configuration and coating method of aluminium foil precoat nano conductive carbon primary coat liquid

A technology of nano-conductivity and configuration method, which is applied in the direction of surface coating liquid device, conductive adhesive, coating, etc., can solve the problem of poor adhesion between lithium iron phosphate active material and current collector aluminum foil, The electrical conductivity of aluminum foil is not improved, which affects the rate performance and cycle performance of the battery, and achieves the effect of high compaction density, low internal resistance, and improved performance.

Active Publication Date: 2012-05-30
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor conductivity of lithium iron phosphate, it is necessary to dope some conductive agents in lithium iron phosphate to improve the conductivity of the material, and to improve the conductivity of ions between the active materials, while the active material and the current collector aluminum foil Conductivity did not improve
Since the particle diameter of the lithium iron phosphate primary particle is generally between 10nm and 2000nm, its contact with the surface of the aluminum foil is point contact, and the lithium iron phosphate active material is poorly bonded to the current collector aluminum foil, resulting in an increase in the internal resistance and polarization of the battery. And affect the rate performance and cycle performance of the battery

Method used

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  • Configuration and coating method of aluminium foil precoat nano conductive carbon primary coat liquid
  • Configuration and coating method of aluminium foil precoat nano conductive carbon primary coat liquid
  • Configuration and coating method of aluminium foil precoat nano conductive carbon primary coat liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The configuration of the aluminum foil pre-coated nano-conductive carbon water-based primer, in terms of mass percentage.

[0025] Take by weighing 1000 grams of double distilled water aqueous solvent and 200 grams of water-based binder A and carry out mechanical stirring for 2 hours to obtain a uniform and stable binder system; add 25 grams (total mass) every 30 minutes in three times under ultrasonic dispersion conditions (75 g) powder nano-conductive carbon composite conductive agent, and then ultrasonically dispersed for 2 hours to obtain a water-based primer with a viscosity of 8000 cps. The nano conductive carbon composite conductive agent here is a mixture of 20 grams of nano conductive carbon and 5 grams of Supper P composite conductive agent. The combination of nano conductive carbon and Spper P can not only increase the conductivity of the primer solution, but also improve the flatness of the coated surface.

Embodiment 2

[0027] The configuration of the aluminum foil pre-coated nano-conductive carbon water-based primer, in terms of mass percentage.

[0028] Take by weighing 1000 grams of alcohol water-based solvent and 200 grams of water-based binder A and carry out mechanical stirring for 1 hour to obtain a uniform and stable binder system; add 18 grams every 30 minutes in three times under ultrasonic dispersion conditions (total mass is 54 g) powder nano-conductive carbon composite conductive agent, and then ultrasonically disperse for 2 hours, and finally obtain a water-based primer with a viscosity of 2000cps. The nano conductive carbon composite conductive agent here is a mixture of 15 grams of nano conductive carbon and 3 grams of Supper P composite conductive agent.

[0029] The aqueous solvent is double distilled water or alcohol / IPA with a concentration of 10%~80%. Since double distilled water or alcohol, IPA contains hydroxyl groups, it can be better compatible with the hydroxyl group...

Embodiment 3

[0032] The configuration of the aluminum foil pre-coated nano-conductive carbon oil-based primer, in mass percent.

[0033] Weigh 1000 grams of N-methylpyrrolidone NMP with a purity greater than 98% as an oily solvent, 35 grams of polyvinylidene fluoride PVDF as a binder B, and mechanically stir for 6 hours under high-speed stirring to obtain a uniform and stable bond After that, add 20 grams (total mass is 60 grams) of powder nano-conductive carbon composite conductive agent system every 30 minutes for three times, and then use ultrasonic ultrasonic dispersion for 2 hours, and finally add 300 grams of NMP to adjust the viscosity. And finally obtain the oily primer with a viscosity of 3000 cps. The nano conductive carbon composite conductive agent is formed by mixing 10 grams of nano conductive carbon and 5 grams of Supper P composite conductive agent.

[0034] The binder B is selected as polyvinylidene fluoride (PVDF), and its molecular weight is between 1 million and 1.1 mi...

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Abstract

A configuration and a coating method of an aluminium foil precoat nano conductive carbon primary coat liquid. The method comprises the following steps of: 1) configuration of the primary coat liquid; 2) ultrasonic dispersion. A cell prepared by the primary coat liquid of the invention has small internal resistance, strong anchoring strength, good conductivity and large compacted density; and the primary coat liquid has obvious effect on high-rate discharge of the cell. Conductive current collectors with different thicknesses can be coated according to cell design requirements and the viscosity of the primary coat liquid, so as to enhance different performances of the cell.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery undercoatings, in particular to a method for configuring and coating an undercoating liquid in an undercoating layer of a lithium iron phosphate cathode material. Background technique [0002] Lithium iron phosphate is a new type of energy storage battery developed in recent years, and has become a new type of power battery due to its high safety performance, long cycle life, and environmental friendliness. However, due to the poor conductivity of lithium iron phosphate, it is necessary to dope some conductive agents in lithium iron phosphate to improve the conductivity of the material, and to improve the conductivity of ions between the active materials, while the active material and the current collector aluminum foil Conductivity was not improved. Since the particle diameter of the lithium iron phosphate primary particle is generally between 10nm and 2000nm, its contact with the su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J9/02C09J11/04C09J133/02C09J133/20C09J127/16B05C11/10B05D7/24H01M4/1397
CPCC09J11/04Y02E60/12C09J133/02C09J127/16H01M4/667B05D7/24H01M4/5825H01M4/661C09J9/02C09J133/20H01M4/1397B05C11/10Y02E60/122Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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