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Lithium ion battery anode coating technology

A lithium-ion battery and coating process technology, applied in battery electrodes, electrode manufacturing, electrolyte layer coatings, etc., can solve the problems of lithium-ion battery performance degradation, high production site toxicity, affecting battery performance and other problems, and achieve high production site toxicity. , the effect of high production cost and low cost

Inactive Publication Date: 2014-07-23
傅汝毅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the organic solvent-based binder polyvinylidene fluoride (PVDF) is mainly used in lithium-ion batteries, and the solvent is N-methylpyrrolidone (NMP), etc., and the proportion of the solvent used is approximately equivalent to the amount of the active material used. Not only the production cost is high, the recycling cost is high, the environment is seriously polluted, and the production site is highly toxic, but also anti-riot treatment is required during the coating and drying process
On the other hand, PVDF contains fluorine, which is easy to react with lithium-intercalated graphite, etc., resulting in a decrease in the performance of lithium-ion batteries, and the insulation properties of PVDF itself for ions and electrons also affect the performance of batteries.

Method used

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  • Lithium ion battery anode coating technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix styrene-butadiene rubber and sodium carboxymethyl cellulose, the mass fraction of which is 1% of styrene-butadiene rubber and 0.7% of sodium carboxymethyl cellulose, and mix and stir for 30 minutes. Then add the positive electrode material lithium cobaltate, stir for 30 minutes, and finally add acetylene black, the mass fraction of acetylene black: 2%, and stir for 2 hours. After stirring, let it stand for 10 minutes to form a paste. Spread the paste evenly on the aluminum foil with a coating thickness of 120 μm. After coating, put it in an oven at 80° C. to dry it to become a positive electrode sheet.

[0015] Assemble the positive electrode sheet into a battery, and test the electrochemical performance of the battery, figure 1 It is the first charge-discharge curve. It can be seen from the figure that the charge and discharge curves of the material each have a platform, and the charge-discharge performance is good.

Embodiment 2

[0017] Mix styrene-butadiene rubber and sodium carboxymethyl cellulose, the mass fraction is 5% of styrene-butadiene rubber and 1.0% of sodium carboxymethyl cellulose, and mix and stir for 40 minutes. Then add the positive electrode material lithium cobaltate, stir for 40 minutes, finally add acetylene black, the mass fraction of acetylene black is 6%, and stir for 2 hours. After stirring, let it stand for 10 minutes to form a paste. Spread the paste evenly on the aluminum foil with a coating thickness of 120 μm. After coating, put it in an oven at 80° C. to dry it to become a positive electrode sheet.

Embodiment 3

[0019] Mix styrene-butadiene rubber and sodium carboxymethyl cellulose, the mass fraction of which is 3% of styrene-butadiene rubber and 0.4% of sodium carboxymethyl cellulose, and mix and stir for 20 minutes. Then add the positive electrode material lithium cobaltate, stir for 20 minutes, finally add acetylene black, the mass fraction of acetylene black is 4%, and stir for 2 hours. After stirring, let it stand for 10 minutes to form a paste. Spread the paste evenly on the aluminum foil with a coating thickness of 80 μm. After coating, place it in an oven at 80°C to dry to become a positive electrode sheet.

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Abstract

The invention discloses a lithium ion battery anode coating technology, which comprises the following steps: mixing and stirring butadiene styrene rubber and carboxymethylcellulose sodium for 20-40 minutes, adding a cathode material for stirring for 20-40 minutes, then adding acetylene black for stirring for 2 hours, standing for 10 minutes to form a paste, uniformly coating the paste on a coating matrix, and drying at the temperature of 80 DEG C. The anode coating employs aqueous binders of butadiene styrene rubber and carboxymethylcellulose sodium, and has the advantages of no solvent release, environment requirement conformity, low cost, non combustion and safe usage. Compared with the organic solvent type binder, the electrode performance by employing the aqueous binder for coating is excellent, and the lithium ion battery anode coating technology has the economic and environmental protection characteristic as well as wide development prospect.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a lithium-ion battery cathode coating process. Background technique [0002] Lithium-ion batteries have unique advantages such as high specific energy, high working voltage, wide application temperature range, low self-discharge rate, long cycle life, no pollution, and good safety performance. Power supplies for portable computers, video cameras, cameras, etc., and have gradually replaced traditional power supplies in the fields of aviation, aerospace, navigation, artificial satellites, small medical instruments and military communication equipment. The battery electrode formation methods generally include molding method, sintering method, electrodeposition method, pulping method, electromagnetic vibration method, film forming method, paste coating method, coagulation method, paste making method, coating method and other methods. The coating method has the characteristics of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139
CPCH01M4/0407H01M4/1391Y02E60/10
Inventor 傅汝毅
Owner 傅汝毅
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