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Preparation method of positive pole piece of high-rate lithium-ion battery

A technology of lithium ion battery and positive electrode plate, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of battery rate type energy difference, general cycle performance, low energy density, etc., and reduce the internal resistance of current collectors. The effect of increasing, increasing the transmission rate, and increasing the cycle rate

Inactive Publication Date: 2016-06-01
JIANGSU LENENG BATTERY INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current problems such as poor adhesion of lithium-ion battery pole pieces, poor battery rate type energy, general cycle performance and low energy density, the present invention provides a lithium-ion battery that improves the adhesion of lithium-ion battery pole pieces, lithium-ion battery A method for preparing a positive pole piece of a battery that can improve the energy density of a lithium-ion battery while providing a rate performance

Method used

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  • Preparation method of positive pole piece of high-rate lithium-ion battery
  • Preparation method of positive pole piece of high-rate lithium-ion battery
  • Preparation method of positive pole piece of high-rate lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. The composition of the composite primer solution is as follows: Weigh 30g PVDF binder, 8g polyaniline, 0.5g benzenesulfonic acid, 10g SP conductive agent and 100g NMP organic solvent in sequence and put them into the ultrasonic disperser, and ultrasonically disperse evenly to obtain an oily composite primer coating liquid;

[0016] 2. Select the modified nickel foam with a porosity of 80%, and use the gravure printing technology to coat the above-mentioned oily composite primer solution on the nickel foam with a coating thickness of 1 μm. The surface is coated with lithium iron phosphate slurry, and dried, rolled and sliced ​​to obtain positive electrode sheets.

Embodiment 2

[0018] 1. The composition of the composite primer solution is as follows: Weigh 5.0g PVDF binder, 5.0g polyaniline, 0.1g benzenesulfonic acid, 1.0g SP conductive agent and 100g NMP organic solvent into the ultrasonic disperser, and ultrasonically disperse evenly Obtain an oily composite primer;

[0019] 2. Select the modified nickel foam with a porosity of 60%, and use the gravure printing technology to coat the above oily composite primer solution on the nickel foam with a coating thickness of 1 μm. After drying, pass the coating machine on the nickel foam. The surface is coated with lithium iron phosphate slurry, dried, sliced, and rolled to obtain a positive electrode sheet.

Embodiment 3

[0021] 1. The composition of the composite primer solution is as follows: 50g PVDF binder, 10g polyaniline, 1.0g benzenesulfonic acid, 20g SP conductive agent and 100g NMP organic solvent were weighed in sequence and put into the ultrasonic disperser, and the ultrasonic dispersion was uniform to obtain an oily composite Primer solution;

[0022] 2. Select the modified nickel foam with a porosity of 90%, and use the gravure printing technology to coat the above-mentioned oily composite primer on the nickel foam with a coating thickness of 1 μm. After drying, pass the coating machine on the nickel foam. Lithium iron phosphate slurry on the surface, and after drying, rolling, and slicing to obtain positive electrode sheets.

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Abstract

The invention provides a preparation method of a positive pole piece of a high-rate lithium-ion battery. The method is characterized by comprising the following steps: firstly, preparing a composite primer liquid; coating the surface of a nickel foam cathode current collector with the composite primer liquid by a gravure printing or spraying technology and drying the nickel foam cathode current collector to obtain a cathode primed piece; and coating the surface with cathode lithium iron phosphate slurry, and carrying out drying and roll-cutting procedures to prepare the positive pole piece. The prepared positive pole piece develops the advantages of high conductivity, high adhesive force and corrosion resistance of a priming coat and the advantage of low volume energy density of a mesh current collector; the cycle performance and the rate capability of the pole piece in the lithium-ion battery are greatly improved; meanwhile, the energy density of the battery is also improved; and the lithium-ion battery prepared from the pole piece is especially suitable for application in a hybrid electric vehicle.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery pole piece preparation, and specifically coats a primer on the surface of a current collector to improve the comprehensive performance of the lithium-ion battery. 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 electrical conductivity of the material, and to improve the conductivity of ions between the active materials, while for the active material and the current collector aluminum foil. The electrical conductivity between them has not been improved. Due to the small particle diameter of the lithium iron phosphate primary particle, its contact wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/66H01M4/74H01M10/0525
CPCH01M4/1397H01M4/661H01M4/745H01M10/0525H01M2004/028Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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