CN109524615A - A method of improving negative electrode of lithium ion battery and is coated with appearance - Google Patents
A method of improving negative electrode of lithium ion battery and is coated with appearance Download PDFInfo
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- CN109524615A CN109524615A CN201811283023.2A CN201811283023A CN109524615A CN 109524615 A CN109524615 A CN 109524615A CN 201811283023 A CN201811283023 A CN 201811283023A CN 109524615 A CN109524615 A CN 109524615A
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- negative electrode
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- electrode slurry
- organic solvent
- ion battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
It is a kind of improve negative electrode of lithium ion battery coating appearance method include the following steps: adjust cathode of lithium battery ingredient: the cathode blending is grouped as by the group of following mass percentage content: cathode major ingredient 94-96%, conductive agent 1-1.5%, sodium carboxymethylcellulose 1.5-2% and SBR emulsion 1.5-2.5%；Negative electrode slurry modulation: deionized water being added into cathode blending, and is stirred, and the viscosity for adjusting negative electrode slurry reaches technique requirement；Organic solvent is added into the negative electrode slurry modulated, and carries out high-speed stirred, the additional proportion of the organic solvent is 1.0%-3.0%.The present invention is by adjusting the ratio of cathode major ingredient and sodium carboxymethylcellulose and after the ratio of cathode major ingredient and sodium carboxymethylcellulose is adjusted, the method of organic solvent is added into negative electrode slurry, it is effectively improved cathode coating appearance, while effectively improving working efficiency, the useless damage of production process is reduced.
Description
Technical field
The present invention relates to a kind of lithium ion battery, especially a kind of method for improving negative electrode of lithium ion battery coating appearance.
Background technique
Coating of lithium-ion battery has the modes such as squash type coating, transfer type coating to need to control in coating process at present
Coating thickness and surface density reach technique requirement；Meanwhile the solvent removed in base material paste is heated by oven drying, so that solid
Body substance is equably pasted on substrate.
It is different with bottom solvent evaporation rate due to coating solution surface in cathode of lithium battery coating process, solvent content hair
Raw concentration difference, causes coating surface tension gradient and free convection phenomenon, so that cathode is coated with bad order.In addition, to improve
Working efficiency, if cathode coating speed is improved, this allows for the above phenomenon and becomes apparent, and it is outer to increase cathode of lithium battery coating
The fraction defective of sight.
Summary of the invention
In view of the problems of the existing technology the present invention, provides a kind of side of improvement negative electrode of lithium ion battery coating appearance
Method, the present invention is by adjusting the ratio of cathode major ingredient and sodium carboxymethylcellulose and in cathode major ingredient and sodium carboxymethylcellulose
After ratio is adjusted, the method that organic solvent is added into negative electrode slurry is effectively improved cathode coating appearance, is improving work
While efficiency, the useless damage of production process generation is reduced.
Technical problem of the present invention is solved with following technical solution:
A method of improving negative electrode of lithium ion battery and be coated with appearance, described method includes following steps:
A, adjust cathode of lithium battery ingredient: the cathode blending is grouped as by the group of following mass percentage content: cathode major ingredient
94-96%, conductive agent 1-1.5%, sodium carboxymethylcellulose 1.5-2% and SBR emulsion 1.5-2.5%；
B, negative electrode slurry is modulated: deionized water being added into cathode blending, and is stirred, the viscosity for adjusting negative electrode slurry reaches
Technique requirement；
C, organic solvent is added into the negative electrode slurry modulated, and carries out high-speed stirred, the additional amount of the organic solvent accounts for
The cathode blending ratio is 1.0%-3.0%；
D, negative electrode slurry is coated in negative electrode tab, observes the appearance of negative electrode tab, record fraction defective.
The method of above-mentioned improvement negative electrode of lithium ion battery coating appearance, in the step a, cathode major ingredient is graphite, conductive
Agent is conductive black.
The method of above-mentioned improvement negative electrode of lithium ion battery coating appearance, in the step b, the viscosity of negative electrode slurry is
1000-3000mPa.S.。
The method of above-mentioned improvement negative electrode of lithium ion battery coating appearance, it is characterised in that: in the step c, organic solvent
For one of methyl pyrrolidone, ethyl alcohol or acetone.
In cathode of lithium battery ingredient of the present invention, cathode major ingredient additional proportion is adjusted to 94-96%, than conventional formulations cathode master
Material additional amount reduces 0.1-0.3%, and sodium carboxymethylcellulose additional proportion is adjusted to 1.5-2%, improves than the amount of being routinely added to
0.1-0.3% improves the content of sodium carboxymethylcellulose, is conducive to dispersion, the stabilization of non-hydrophilic composite material, when so that cathode being coated with,
Slurry has preferable mobility, and can prevent negative electrode tab coating surface from generating bad phenomenon；It is fine in cathode major ingredient and carboxymethyl
After tieing up plain sodium ratio adjustment, after slurry is modulated to the concentration of technique requirement, organic solvent is added into slurry, and control organic
The additional proportion of solvent is 1.0-3.0%, can be effectively reduced different with bottom solvent evaporation rate because of cathode painting slurry surface
The solvent strength of generation is poor, reduces coating surface tension gradient, and then reduces cathode coating solution by flowing to compared with low surface tension
At high surface tension, cathode cathode is caused to be coated with bad order.The method of the present invention strong operability effectively improves cathode painting
Cloth appearance reduces the useless loss rate of production process while improving working efficiency.
The undesirable element for influencing cathode coating appearance mainly includes negative terminal surface cracking and the dark trace of negative terminal surface, wherein bearing
Pole surface cracking judgment criteria is that any cracking of negative terminal surface is unqualified；The dark trace of negative terminal surface be mainly on pole piece dressing at
Strip, partially thin, color and the inconsistent phenomenon of surrounding dressing, criterion are negative very dark trace without obvious convex-concave feel, and width is small
In 2mm, length is less than 2cm, single less than two at be standard, be substandard product more than this standard.Generate coating appearance not
Good phenomenon the main reason for it is unreasonable with the content proportion of organic solvent for sodium carboxymethylcellulose, the present invention is by adjusting negative
Pole major ingredient additional proportion reduces 0.1-0.3%, sodium carboxymethylcellulose additional proportion ratio than conventional formulations cathode major ingredient additional amount
The amount of being routinely added to improves 0.1-0.3%, improves the content of sodium carboxymethylcellulose, and the additional proportion for controlling organic solvent is
1.0-3.0%, hence it is evident that improve cathode coating bad order phenomenon.
Specific embodiment
The present invention gives the formula of cathode of lithium battery ingredient, cathode major ingredient 94-96%, conductive agent 1-1.5%, carboxymethyl are fine
Tie up element sodium 1.5-2% and SBR emulsion 1.5-2.5%.
Cathode major ingredient is the active material of electrochemical reaction, and conductive agent is the electric conductivity for improving negative electrode, carboxymethyl cellulose
Plain sodium mainly changes grain surface texture primarily as dispersing agent and thickener, SBR emulsion, is allowed to and cathode major ingredient
It is more affine with sodium carboxymethylcellulose.
The content for reducing cathode major ingredient, improves the content of sodium carboxymethylcellulose, is conducive to the dispersion, steady of non-hydrophilic composite material
Fixed, when so that cathode being coated with, slurry is had preferable mobility, and can prevent negative electrode tab coating surface from generating bad phenomenon；?
After cathode major ingredient and the adjustment of sodium carboxymethylcellulose ratio, after slurry is modulated to the concentration of technique requirement, it is added into slurry
Organic solvent, and the additional proportion for controlling organic solvent is 1.0-3.0%, can effectively reduce because of cathode painting slurry surface and
The solvent strength that bottom solvent evaporation rate difference generates is poor, reduces coating surface tension gradient, and then it is molten to reduce cathode coating
Liquid causes cathode cathode to be coated with bad order by flowing to high surface tension compared with low surface tension.
After cathode major ingredient and sodium carboxymethylcellulose are by formula rate adjustment, water is added to be made negative electrode slurry, then to cathode
A certain proportion of organic solvent is added in slurry, is coated.
The invention will be further described with reference to embodiments.
Embodiment 1
Adjust cathode of lithium battery ingredient: the cathode blending is grouped as by the group of following mass percentage content: cathode major ingredient
94.9%, conductive agent 1%, sodium carboxymethylcellulose 1.6% and SBR emulsion 2.5%；Deionized water is added into cathode blending,
And be stirred, the viscosity for adjusting negative electrode slurry is 1000-3000mPa.S.；It is added into the negative electrode slurry modulated organic molten
Agent, and high-speed stirred is carried out, the additional proportion of the organic solvent (one of methyl pyrrolidone, ethyl alcohol or acetone) is
1.0%；Negative electrode slurry is coated in negative electrode tab, the appearance of negative electrode tab is observed, records fraction defective.
The proportion of cathode major ingredient reduces 0.1% compared to conventional proportions, and sodium carboxymethylcellulose is improved compared to conventional proportions
0.1%, the additional amount of organic solvent is 1.0%, and with this condition, the fraction defective of cathode of lithium battery appearance is reduced to by 2.8%
0.23%。
Embodiment 2
Adjust cathode of lithium battery ingredient: the cathode blending is grouped as by the group of following mass percentage content: cathode major ingredient
94.9%, conductive agent 1%, sodium carboxymethylcellulose 1.6% and SBR emulsion 2.5%；Deionized water is added into cathode blending,
And be stirred, the viscosity for adjusting negative electrode slurry is 1000-3000mPa.S.；It is added into the negative electrode slurry modulated organic molten
Agent, and high-speed stirred is carried out, the additional proportion of the organic solvent (one of methyl pyrrolidone, ethyl alcohol or acetone) is
3.0%；Negative electrode slurry is coated in negative electrode tab, the appearance of negative electrode tab is observed, records fraction defective.
The proportion of cathode major ingredient reduces 0.1% compared to conventional proportions, and sodium carboxymethylcellulose is improved compared to conventional proportions
0.1%, the additional amount of organic solvent is 3.0%, and with this condition, the fraction defective of cathode of lithium battery appearance is reduced to by 2.8%
0.25%。
Embodiment 3
Adjust cathode of lithium battery ingredient: the cathode blending is grouped as by the group of following mass percentage content: cathode major ingredient
94.7%, conductive agent 1%, sodium carboxymethylcellulose 1.8% and SBR emulsion 2.5%；Deionized water is added into cathode blending,
And be stirred, the viscosity for adjusting negative electrode slurry is 1000-3000mPa.S.；It is added into the negative electrode slurry modulated organic molten
Agent, and high-speed stirred is carried out, the additional proportion of the organic solvent (one of methyl pyrrolidone, ethyl alcohol or acetone) is
3.0%；Negative electrode slurry is coated in negative electrode tab, the appearance of negative electrode tab is observed, records fraction defective.
The proportion of cathode major ingredient reduces 0.3% compared to conventional proportions, and sodium carboxymethylcellulose is improved compared to conventional proportions
0.3%, the additional amount of organic solvent is 1.0%, and with this condition, the fraction defective of cathode of lithium battery appearance is reduced to by 2.8%
0.26%。
Embodiment 4
Adjust cathode of lithium battery ingredient: the cathode blending is grouped as by the group of following mass percentage content: cathode major ingredient
94.7%, conductive agent 1%, sodium carboxymethylcellulose 1.8% and SBR emulsion 2.5%；Deionized water is added into cathode blending,
And be stirred, the viscosity for adjusting negative electrode slurry is 1000-3000mPa.S.；It is added into the negative electrode slurry modulated organic molten
Agent, and high-speed stirred is carried out, the additional proportion of the organic solvent (one of methyl pyrrolidone, ethyl alcohol or acetone) is
3.0%；Negative electrode slurry is coated in negative electrode tab, the appearance of negative electrode tab is observed, records fraction defective.
The proportion of cathode major ingredient reduces 0.3% compared to conventional proportions, and sodium carboxymethylcellulose is improved compared to conventional proportions
0.3%, the additional amount of organic solvent is 3.0%, and with this condition, the fraction defective of cathode of lithium battery appearance is reduced to by 2.8%
0.22%。
Claims (4)
1. a kind of method for improving negative electrode of lithium ion battery coating appearance, it is characterised in that: described method includes following steps:
A, adjust cathode of lithium battery ingredient: the cathode blending is grouped as by the group of following mass percentage content: cathode major ingredient
94-96%, conductive agent 1-1.5%, sodium carboxymethylcellulose 1.5-2% and SBR emulsion 1.5-2.5%；
B, negative electrode slurry is modulated: deionized water being added into cathode blending, and is stirred, the viscosity for adjusting negative electrode slurry reaches
Technique requirement；
C, organic solvent is added into the negative electrode slurry modulated, and carries out high-speed stirred, the additional proportion of the organic solvent
For 1.0%-3.0%；
D, negative electrode slurry is coated in negative electrode tab, observes the appearance of negative electrode tab, record fraction defective.
2. the method according to claim 1 for improving negative electrode of lithium ion battery coating appearance, it is characterised in that: the step
In a, cathode major ingredient is graphite, and conductive agent is conductive black.
3. the method according to claim 2 for improving negative electrode of lithium ion battery coating appearance, it is characterised in that: the step
In b, the viscosity of negative electrode slurry is 1000-3000mPa.S..
4. the method according to claim 3 for improving negative electrode of lithium ion battery coating appearance, it is characterised in that: the step
In c, organic solvent is one of methyl pyrrolidone, ethyl alcohol or acetone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811283023.2A CN109524615B (en) | 2018-10-31 | 2018-10-31 | Method for improving coating appearance of lithium ion battery cathode |
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| CN201811283023.2A CN109524615B (en) | 2018-10-31 | 2018-10-31 | Method for improving coating appearance of lithium ion battery cathode |
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| CN109524615B CN109524615B (en) | 2021-11-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525131A (en) * | 2020-04-08 | 2020-08-11 | 重庆市紫建电子股份有限公司 | Negative electrode material for lithium ion battery and preparation method thereof |
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| JP2000040504A (en) * | 1998-07-21 | 2000-02-08 | Sony Corp | Manufacture of positive mix for organic electrolyte battery |
| CN101604742A (en) * | 2009-06-12 | 2009-12-16 | 珠海锂源投资有限公司 | A kind of graphite water-base cathode formula and preparation method |
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| CN111525131A (en) * | 2020-04-08 | 2020-08-11 | 重庆市紫建电子股份有限公司 | Negative electrode material for lithium ion battery and preparation method thereof |
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