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Preparation method of water system laminated type lithium-ion battery pole piece

A lithium-ion battery, laminated technology, applied in the direction of electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., can solve the problems of poor consistency of coating surface density, low rolling efficiency, poor adhesion, etc., to achieve The surface density of the pole piece is consistent, the rolling speed is increased, and the service life is prolonged

Active Publication Date: 2016-11-16
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problems of the first process are that the work efficiency of intermittent coating is low, and the range of abnormal areas at the head and tail is large, the scrap rate of scraps is high, the frequent vibration load of the roller press is large, and the slicing efficiency is low
The problem with the second process is that the rolling efficiency is low and the rolling consistency is poor.
However, if high-viscosity granular materials are used for coating, the density consistency of the coating surface is poor, and the coating efficiency is low. The slurry is adhered to the current collector by using a rolling method, and the adhesion is poor. There may be a sticking problem in the process. These Both will have an impact on battery performance and processing performance

Method used

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  • Preparation method of water system laminated type lithium-ion battery pole piece
  • Preparation method of water system laminated type lithium-ion battery pole piece
  • Preparation method of water system laminated type lithium-ion battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation steps of the water system laminated lithium ion battery pole piece are as follows:

[0033] 1) Continuous coating slurry

[0034] Positive electrode: adopt the gravure printing method to continuously coat carbon material (in terms of mass ratio, SuperP: KS6: sodium carboxymethyl cellulose: styrene-butadiene rubber = 45:20:30:5) on both sides of a 15 μm thick aluminum foil to form a carbon-coated layer, Coating speed 35m / min, coating density 2g / m on one side 2 , double-sided density 4g / m 2 , the oven temperature is 70°C, the width of the aluminum foil is 420 mm, the width of the carbon-coated layer is 375 mm, the carbon-coated layer is located in the center of the width direction of the aluminum foil, and the thickness is 1.5 μm; Continuous coating of water-based positive electrode slurry (in terms of mass ratio, lithium iron phosphate: carbon nanotubes: Super P: polyvinylidene fluoride: N-methylpyrrolidone = 93:1:2:4:92.3), coating speed 20m / min, fee...

Embodiment 2

[0045] The preparation steps of the water system laminated lithium ion battery pole piece are as follows:

[0046] 1) Continuous coating slurry

[0047] Positive electrode: adopt the gravure printing method to continuously coat carbon material (in terms of mass ratio, SuperP: KS6: sodium carboxymethyl cellulose: styrene-butadiene rubber = 40:15:25:3) on both sides of a 12 μm thick aluminum foil to form a carbon-coated layer, Coating speed 30m / min, coating density 1g / m on one side 2 , double-sided density 2g / m 2 , the oven temperature is 60°C, the width of the aluminum foil is 430 mm, the width of the carbon-coated layer is 385 mm, the carbon-coated layer is located in the center of the width direction of the aluminum foil, and the thickness is 1.5 μm; Continuous coating of water-based cathode slurry (in terms of mass ratio, lithium iron phosphate: carbon nanotubes: Super P: polyvinylidene fluoride: N-methylpyrrolidone = 90:0.8:1.5:3:90), coating speed 20m / min, feed speed 1...

Embodiment 3

[0057] The preparation steps of the water system laminated lithium ion battery pole piece are as follows:

[0058] 1) Continuous coating slurry

[0059] Positive electrode: adopt the gravure printing method to continuously coat carbon material (in terms of mass ratio, SuperP: KS6: sodium carboxymethyl cellulose: styrene-butadiene rubber = 50:25:35:8) to form a carbon coating layer on both sides of a 20 μm thick aluminum foil, Coating speed 40m / min, coating density 3g / m on one side 2 , double-sided density 6g / m 2 , the oven temperature is 80°C, the width of the aluminum foil is 450mm, the width of the carbon-coated layer is 405mm, the carbon-coated layer is located in the center of the width direction of the aluminum foil, and the thickness is 1.5μm; Continuous coating of water-based cathode slurry (in terms of mass ratio, lithium iron phosphate: carbon nanotubes: Super P: polyvinylidene fluoride: N-methylpyrrolidone = 95:1.2:2.5:5:95), coating speed 25m / min, feed speed 130...

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Abstract

The invention discloses a preparation method of a water system laminated type lithium-ion battery pole piece and belongs to the technical field of production of lithium-ion batteries. The method has the following advantages that (1) continuous coating is realized, the coating efficiency is improved, the range of a coating thickness abnormal region is reduced and the coating thickness is monitored online; (2) continuous roll pressing is realized, the roll pressing efficiency is improved, a roll pressing thickness is monitored online and frequent vibration loss of a roll pressing machine is alleviated; (3) the thicknesses of cut regions are the same in a cutting process, the cutting defects are small and the stability is good; (4) the slicing efficiency can be improved by utilizing high-speed slicing equipment, surface defects of the pole piece can be monitored online by utilizing a CCD (Charge Coupled Device) image measuring instrument and NG pole pieces are eliminated; and (5) the waste of raw material left overs is reduced and the utilization rate of positive and negative electrode foils and positive and negative electrode materials is improved.

Description

technical field [0001] The invention relates to a preparation method of a water-system laminated lithium-ion battery pole piece, belonging to the technical field of lithium-ion battery production. Background technique [0002] With the excessive consumption of non-renewable resources and the deterioration of the ecological environment, the development of human society is facing unprecedented challenges and risks, so the development of clean, convenient, pollution-free and safe new energy is imminent. Among them, lithium-ion batteries have the characteristics of high energy density, high working voltage, long cycle life, excellent safety performance, and environmental protection, and have attracted widespread attention from all over the world. With the rapid development of new energy vehicles, the research and development of lithium-ion batteries and innovation in the field of new materials are also accelerating. [0003] A lithium-ion battery generally consists of a positiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139
CPCH01M4/0404H01M4/0435H01M4/139Y02E60/10
Inventor 孙敬张洁樊彦良庞可可杨秋菊韩洪伟王伟夏云华焦光强
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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