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

A technology of lithium ion battery and negative pole piece, applied in 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
无锡市明杨新能源股份有限公司
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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 large positive particles can easily pierce the battery separator and cause short-circuit and micro-short circuit of the battery, and the electrode with a large area increases the probability of short circuit

Method used

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

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Embodiment 1

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

[0015] a. Use artificial graphite as the negative electrode active material, carbon black as the conductive agent, carboxymethyl cellulose as the thickener, styrene-butadiene rubber as the binder, 92 parts of artificial graphite, 3 parts of carbon black, and carboxymethyl fiber The element is 2 parts, and the mass concentration is 2 parts of the styrene-butadiene latex of 40%;

[0016] b. Bake the solid powder 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 powder to 21°C, and take the deionized Water is used as a solvent, carboxymethyl cellulose is poured into deionized water, the weight ratio of deionized water to all solid powders is 1.1:1, and it is stirred for 2 hours...

Embodiment 2

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

[0027] a. Take artificial graphite as negative electrode active material, carbon black as conductive agent, carboxymethyl cellulose as thickener, styrene-butadiene rubber as binder, 89 parts of artificial graphite, 5 parts of carbon black, carboxymethyl fiber The element is 3 parts, and the mass concentration is 40% styrene-butadiene latex emulsion is 3 parts;

[0028] 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 80°C; cool the baked solid substance to 23°C, and take deionized water as Solvent, pour carboxymethyl cellulose into deionized water, the weight ratio of deionized water to all solid powders is 1.2:1, stir for 5 hours under vacuum conditions less than or equal to -0.095M...

Embodiment 3

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

[0039] a. Take artificial graphite as negative electrode active material, carbon black as conductive agent, carboxymethyl cellulose as thickener, styrene-butadiene rubber as binder, 95 parts of artificial graphite, 1 part of carbon black, carboxymethyl fiber The element is 1 part, and the mass concentration is 3 parts of the styrene-butadiene latex of 40%;

[0040] b. Bake the solid substance in step a for 3 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 deionized water as Solvent, pour carboxymethyl cellulose into deionized water, the weight ratio of deionized water to all solid powders is 0.5:1, stir for 1 hour under vacuum conditions less than or equal...

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Abstract

The present invention discloses a manufacturing method of a high-rate type lithium-ion battery negative electrode sheet, comprising the following steps: taking artificial graphite, carbon black, carboxymethyl cellulose, and styrene-butadiene rubber emulsion, drying and cooling under vacuum conditions, and Carboxymethyl cellulose is poured into deionized water and stirred to dissolve, and then carbon black, artificial graphite and styrene-butadiene rubber emulsion are poured into the dissolved solution to make a slurry; the slurry is coated on the surface of aluminum foil, and the deionized Dry the ionized water after volatilization; add polyvinylpyrrolidone to anhydrous ethanol and stir and dissolve to make a solution; coat the solution on the pole piece coated with slurry, bake and cool the pole piece under vacuum condition, and roll the pole piece Pressed into a negative electrode sheet. 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 negative 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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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 钱胜利
Owner 无锡市明杨新能源股份有限公司
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