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A kind of manufacturing method of high-rate type lithium-ion battery positive pole piece

A lithium-ion battery and positive pole piece technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of pole piece short circuit, micro short circuit, battery short circuit, etc., and achieve less floating powder, high rate discharge performance, and assembly pass rate high effect

Inactive Publication Date: 2011-12-28
无锡市明杨新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a high-rate discharge lithium-ion battery, it is usually necessary to use a thinner diaphragm to reduce the internal resistance of the battery to achieve high-rate discharge performance, and the electrode sheet area is larger, and the diaphragm used is usually less than 25 μm. Based on the comparison of the above data, the conventional negative electrode sheet Dust or positive electrode dust with larger particles can easily pierce the battery separator and cause short circuit and micro short circuit of the battery, and the larger electrode sheet increases the probability of short circuit

Method used

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  • A kind of manufacturing method of high-rate type lithium-ion battery positive pole piece
  • A kind of manufacturing method of high-rate type lithium-ion battery positive pole piece

Examples

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Embodiment 1

[0014] Embodiment 1: the manufacture method of a kind of high-rate type lithium-ion battery positive pole piece of the present invention, comprises following process step: its formula ratio is counted by weight parts:

[0015] a. Take 920g of nickel-cobalt lithium manganate, 500g of polyvinylidene fluoride, 200g of carbon black, and 100g of conductive graphite, wherein 92 parts of nickel-cobalt lithium manganate, 5 parts of polyvinylidene fluoride, 2 parts of carbon black, and 100 g of conductive graphite 1 copy;

[0016] b. Bake the solid powder in step a for 4 hours under a vacuum condition of less than or equal to -0.095MPa, the baking temperature is 100°C; cool the baked solid powder to 21°C, take N -Methylpyrrolidone solution is used as a solvent, polyvinylidene fluoride is poured into N-methylpyrrolidone solution, the weight ratio of N-methylpyrrolidone solution to all solid powders is 0.7:1, at less than or equal to -0.095MPa Stir under vacuum conditions for 4 hours to...

Embodiment 2

[0026] Embodiment 2: the manufacture method of a kind of high-rate type lithium-ion battery positive pole piece of the present invention, comprises following process step: its formula ratio is counted by weight parts:

[0027] a. Take 900g of nickel-cobalt lithium manganese oxide, 400g of polyvinylidene fluoride, 400g of carbon black, and 200g of conductive graphite, wherein 90 parts of nickel-cobalt lithium manganese oxide, 4 parts of polyvinylidene fluoride, 4 parts of carbon black, and 4 parts of conductive graphite 2 copies;

[0028] b. Bake the solid substance in step a for 2 hours under a vacuum condition of less than or equal to -0.095MPa, and the baking temperature is 120°C; cool the baked solid substance to 23°C, and take N-methyl Pyrrolidone solution is used as a solvent, polyvinylidene fluoride is poured into N-methylpyrrolidone solution, the weight ratio of N-methylpyrrolidone solution to all solid powders is 1:1, under vacuum conditions less than or equal to -0.09...

Embodiment 3

[0038] Embodiment 3: the manufacture method of a kind of high-rate type lithium-ion battery positive pole piece of the present invention, comprises the following process steps: its formula proportion is counted by weight part number:

[0039] a, get nickel cobalt lithium manganate 950g, polyvinylidene fluoride 200g, carbon black 100g, conductive graphite 200g wherein the weight percentage of nickel cobalt lithium manganate is 95%, the weight percentage of polyvinylidene fluoride is 2% , the weight percentage of carbon black is 1%, the weight percentage of conductive graphite is 2%,

[0040] b. Bake the solid substance in step a for 4 hours under a vacuum condition of less than or equal to -0.095MPa, and the baking temperature is 100°C; cool the baked solid substance to 25°C, and take N-methyl Pyrrolidone solution is used as a solvent, polyvinylidene fluoride is poured into N-methylpyrrolidone solution, the weight ratio of N-methylpyrrolidone solution to all solid powders is 0....

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Abstract

The invention discloses a method for making a positive pole piece of a high-rate lithium-ion battery, which is characterized in that it comprises the following steps: taking nickel-cobalt lithium manganese oxide, polyvinylidene fluoride, carbon black, and conductive graphite; baking under vacuum conditions , cooling; Pour polyvinylidene fluoride into N-methylpyrrolidone solution to make it fully dissolved, then pour carbon black, conductive graphite and nickel cobalt lithium manganate into the dissolved solution to make a slurry; the slurry Coated on the surface of aluminum foil, volatilize N-methylpyrrolidone in an oven and then dry; add polyvinylpyrrolidone to anhydrous ethanol to stir and dissolve to make a solution, and coat it on the pole piece with slurry, bake it in vacuum and cool it The pole piece is pressed into a positive pole piece with a rolling mill. The pole piece prepared by the method of the invention has the characteristics of less floating powder, smooth and burr-free surface of the pole piece, good high-rate discharge performance and high reliability, and the operation method is simple and easy, and the qualified rate of battery assembly is high. Lithium-ion batteries are suitable for power tools and electric bicycles.

Description

technical field [0001] The invention relates to a method for manufacturing a positive pole piece of a high-rate lithium-ion battery. The battery produced by using the pole piece has the characteristics of low short-circuit rate and high safety performance. Background technique [0002] Due to its electrochemical reaction characteristics, the separator used in lithium-ion batteries is usually between 18-40 μm, and the material of the positive and negative electrodes of the battery is a cylindrical battery with a positive electrode of nickel-cobalt lithium manganese oxide and a negative electrode of artificial graphite. , the D50 particle size of the positive electrode is usually 5-10 μm, and the D90 particle size is above 20 μm. The D50 particle size of the negative electrode is usually 15-25 μm. As a high-rate discharge lithium-ion battery, it is usually necessary to use a thinner diaphragm to reduce the internal resistance of the battery to achieve high-rate discharge perf...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 钱胜利
Owner 无锡市明杨新能源有限公司
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