CN105489832A - Method for solving serious roll sticking problem of aqueous cathode slurry in rolling process - Google Patents
Method for solving serious roll sticking problem of aqueous cathode slurry in rolling process Download PDFInfo
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- CN105489832A CN105489832A CN201510843088.8A CN201510843088A CN105489832A CN 105489832 A CN105489832 A CN 105489832A CN 201510843088 A CN201510843088 A CN 201510843088A CN 105489832 A CN105489832 A CN 105489832A
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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
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
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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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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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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Abstract
The invention discloses a method for solving a serious roll sticking problem of aqueous cathode slurry in a rolling process. The method comprises the following steps: adding the proportion of SBR in a homogenizing process to prolong the stirring time; controlling the coating temperature in a coating process so that the coating temperature is increased in a stepped manner and then decreased in the stepped manner, wherein the slurry is in a half-dry state after primary coating and the slurry is in a full-dry state after secondary coating in two times of coating; detecting whether the condition of graphite that the rolling thickness is rebounded appears in the rolling process, if the condition that the rolling thickness is rebounded appears, firstly carrying out primary rolling, entering a baking oven for baking, cooling after vacuumizing, and then carrying out secondary rolling; and if the condition that the rolling thickness is rebounded does not appear, firstly entering the baking oven for baking, cooling after vacuumizing, and then rolling. The method has the advantages and beneficial effects that the method is adopted, the quality of pole pieces is improved, the production waste is reduced, roll sticking can hardly appear for the cathode slurry in the rolling working procedure, the production of workers is convenient, and the rejection rate is low.
Description
Technical field
The invention belongs to lithium battery production field, especially relate to a kind of method solving water system cathode size roll banding serious problems in nipping process.
Background technology
Lithium cell cathode material is prepared from by following raw material: carbon powder, graphite, CMC (sodium carboxymethylcellulose), SBR (butadiene-styrene rubber) and deionized water.This formula is water system technique, and CMC content is 2.0%, and it is as thickener, and slurry is very rare, and temperature during coating arranges higher, and coating speed is comparatively slow, and pole piece could be dried.This technique is within a very long time run simultaneously, occurs roll banding phenomenon at pair roller operation cathode size, and material is fallen in serious appearance, causes cathode pole piece partially thin, occurs analysing lithium, produce a very large impact battery performance, causes more waste product to occur.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of method solving water system cathode size roll banding serious problems in nipping process, can solve the problem.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of method solving water system cathode size roll banding serious problems in nipping process, comprises the following steps:
Steps A: homogenate: the summation keeping the mass percent of CMC and SBR is 3.5%, all the other are carbon powder, graphite and deionized water etc., wherein the mass percent of SBR is 2.1 ~ 2.3%, mixing time is 2 hours, mixing speed is no more than 800rpm, if exceed this numerical value, may stir process in saboteur's structure; By improving the addition of SBR, improve entire slurry caking property;
Step B: coating: adopt 7 joint unicoaters, coating temperature is that staged increases, then declines in staged, in twice coating, makes slurry be leather hard after first pass coating, makes slurry be absolutely dried condition after second time coating;
Step C: roll-in: detect the situation whether graphite there will be the bounce-back of roll-in thickness, if there is, then first carry out a roll-in, enter oven for drying, vacuumize rear cooling, then carry out secondary roll-in; If there is not the situation that roll-in thickness rebounds, be then introduced into oven for drying, vacuumize rear cooling, then carry out roll-in.
Preferably, in described steps A, whipping process is divided into two agitation phases, and the mixing time of each agitation phases is 1 hour, and the mixing speed of the first agitation phases is greater than the mixing speed of the second agitation phases.
Preferably, in described steps A, mixing speed is 500 ~ 800rpm.Mixing speed can make roll banding phenomenon weaken within the scope of this, avoids the situation revealing paper tinsel to occur.
Preferably, in described step B, the speed of first pass coating is greater than the speed of second time coating.Guarantee that first pass coating makes slurry be in leather hard, second time coating makes slurry be in absolutely dried condition.
Preferably, in described step B, the speed of first pass coating is 8 ~ 9m/min, and the speed of second time coating is 6 ~ 7.5m/min.
Preferably, in described step B, the coating temperature of twice coating is: one dries temperature 80 ~ 90 DEG C, two dry temperature 80 ~ 90 DEG C, and three dry temperature 100 DEG C, and four dry temperature 90 ~ 100 DEG C, five dry temperature 80 ~ 90 DEG C, and six dry temperature 70 ~ 80 DEG C, and seven dry temperature 70 ~ 80 DEG C.One temperature of drying comparatively common process promotes to some extent, object ensures that slurry is drier state when charging, six temperature of drying comparatively common process decline to some extent, and object guarantees that the coated disposed slurry of first pass is half-dried state, prevents the phenomenon of slurry roll banding.
Preferably, in described step B, the coating temperature of twice coating is: one dries temperature 85 DEG C, and two dry temperature 85 DEG C, and three dry temperature 100 DEG C, and four dry temperature 95 DEG C, and five dry temperature 85 DEG C, and six dry temperature 75 DEG C, and seven dry temperature 75 DEG C.This is preferred Temperature Distribution.
Preferably, in described step C, the bake out temperature of baking oven is 100 ~ 110 DEG C, and drying time is 4 ~ 8 hours.
Preferably, in described step C, no matter detect the situation whether graphite there will be the bounce-back of roll-in thickness, vacuumize after being all cooled to 50 ~ 60 DEG C, carry out roll-in.
Preferably, in described steps A, the ratio of SBR is the mixing speed of the 2.3%, first agitation phases is 800rpm, and the mixing speed of the second agitation phases is 500rpm.Mixing speed is arranged on this value, and interior that roll banding degree is reduced to is minimum, does not fall material.
Produce a collection of cathode pole piece under normal circumstances and need 3 ~ 4 hours, if do not adopt the technical program, need per half an hour to clear up a roller, each cleaning approximately needs 10 minutes, labor intensive, reduces production efficiency.After adopting the technical program, produce in the process of a collection of cathode pole piece and can realize unclear roller, substantially increase production efficiency.
The advantage that the present invention has and good effect are: adopt the present invention, improve pole piece quality, and reduce to produce waste, within a very long time run, can reach pair roller operation cathode size roll banding hardly, employee is convenient for production, and scrappage is low.
Embodiment
Below specific embodiments of the invention are elaborated.
Embodiment 1
Solve a method for water system cathode size roll banding serious problems in nipping process, comprise the following steps:
The mass percent of steps A: homogenate: SBR is 2.3%, the mass percent of CMC is 1.2%, all the other are carbon powder, graphite and deionized water etc., wherein, mixing time is 2 hours, and whipping process is divided into two agitation phases, and the mixing time of each agitation phases is 1 hour, the mixing speed of the first agitation phases is 800rpm, and the mixing speed of the second agitation phases is 500rpm;
Step B: coating: adopt 7 joint unicoaters, coating temperature is that staged increases, decline in staged again, the coating temperature of twice coating is: one dries temperature 85 DEG C, and two dry temperature 85 DEG C, and three dry temperature 100 DEG C, four dry temperature 95 DEG C, five dry temperature 85 DEG C, and six dry temperature 75 DEG C, and seven dry temperature 75 DEG C.In twice coating, the speed of first pass coating is 8.5m/min, and the speed of second time coating is 7m/min, makes slurry be leather hard after guaranteeing first pass coating, makes slurry be absolutely dried condition after second time coating;
Step C: roll-in: detect the situation that graphite there will be the bounce-back of roll-in thickness, then first carry out a roll-in, enter oven for drying 4 hours, bake out temperature is 105 DEG C, is cooled to 55 DEG C after vacuumizing, then carries out secondary roll-in.
Embodiment 2
Solve a method for water system cathode size roll banding serious problems in nipping process, comprise the following steps:
The mass percent of steps A: homogenate: SBR is 2.1%, the mass percent of CMC is 1.4%, all the other are carbon powder, graphite and deionized water etc., wherein, mixing time is 2 hours, and whipping process is divided into two agitation phases, and the mixing time of each agitation phases is 1 hour, the mixing speed of the first agitation phases is 800rpm, and the mixing speed of the second agitation phases is 600rpm;
Step B: coating: adopt 7 joint unicoaters, coating temperature is that staged increases, decline in staged again, the coating temperature of twice coating is: one dries temperature 80 DEG C, and two dry temperature 80 DEG C, and three dry temperature 100 DEG C, four dry temperature 90 DEG C, five dry temperature 80 DEG C, and six dry temperature 70 C, and seven dry temperature 70 C.In twice coating, the speed of first pass coating is 8m/min, and the speed of second time coating is 6m/min, makes slurry be leather hard after guaranteeing first pass coating, makes slurry be absolutely dried condition after second time coating;
Step C: roll-in: detect the situation that graphite there will be the bounce-back of roll-in thickness, then first carry out a roll-in, enter oven for drying 8 hours, bake out temperature is 100 DEG C, is cooled to 50 DEG C after vacuumizing, then carries out secondary roll-in.
Embodiment 3
Solve a method for water system cathode size roll banding serious problems in nipping process, comprise the following steps:
The mass percent of steps A: homogenate: SBR is 2.2%, the mass percent of CMC is 1.3%, all the other are carbon powder, graphite and deionized water etc., wherein, mixing time is 2 hours, and whipping process is divided into two agitation phases, and the mixing time of each agitation phases is 1 hour, the mixing speed of the first agitation phases is 790rpm, and the mixing speed of the second agitation phases is 650rpm;
Step B: coating: adopt 7 joint unicoaters, coating temperature is that staged increases, decline in staged again, the coating temperature of twice coating is: one dries temperature 90 DEG C, and two dry temperature 90 DEG C, and three dry temperature 100 DEG C, four dry temperature 100 DEG C, five dry temperature 90 DEG C, and six dry temperature 80 DEG C, and seven dry temperature 80 DEG C.In twice coating, the speed of first pass coating is 9m/min, and the speed of second time coating is 7.5m/min, makes slurry be leather hard after guaranteeing first pass coating, makes slurry be absolutely dried condition after second time coating;
Step C: roll-in: detect the situation that graphite there will be the bounce-back of roll-in thickness, then first carry out a roll-in, enter oven for drying 6 hours, bake out temperature is 110 DEG C, is cooled to 60 DEG C after vacuumizing, then carries out secondary roll-in.
Embodiment 4
Solve a method for water system cathode size roll banding serious problems in nipping process, comprise the following steps:
The mass percent of steps A: homogenate: SBR is 2.3%, the mass percent of CMC is 1.2%, all the other are carbon powder, graphite and deionized water etc., wherein, mixing time is 2 hours, and whipping process is divided into two agitation phases, and the mixing time of each agitation phases is 1 hour, the mixing speed of the first agitation phases is 800rpm, and the mixing speed of the second agitation phases is 720rpm;
Step B: coating: adopt 7 joint unicoaters, coating temperature is that staged increases, decline in staged again, the coating temperature of twice coating is: one dries temperature 83 DEG C, and two dry temperature 86 DEG C, and three dry temperature 100 DEG C, four dry temperature 96 DEG C, five dry temperature 86 DEG C, and six dry temperature 73 DEG C, and seven dry temperature 73 DEG C.In twice coating, the speed of first pass coating is 8.3m/min, and the speed of second time coating is 6.5m/min, makes slurry be leather hard after guaranteeing first pass coating, makes slurry be absolutely dried condition after second time coating;
Step C: roll-in: detect the situation that graphite there will not be roll-in thickness to rebound, be then introduced into oven for drying 4 hours, bake out temperature is 105 DEG C, is cooled to 55 DEG C after vacuumizing, then carries out roll-in.
Above embodiments of the invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (10)
1. solve a method for water system cathode size roll banding serious problems in nipping process, it is characterized in that: comprise the following steps:
Steps A: homogenate: the summation keeping the mass percent of CMC and SBR is 3.5%, and all the other are carbon powder, graphite and deionized water etc., and wherein the mass percent of SBR is 2.1 ~ 2.3%, and mixing time is 2 hours, and mixing speed is no more than 800rpm;
Step B: coating: adopt 7 joint unicoaters, coating temperature is that staged increases, then declines in staged, in twice coating, makes slurry be leather hard after first pass coating, makes slurry be absolutely dried condition after second time coating;
Step C: roll-in: detect the situation whether graphite there will be the bounce-back of roll-in thickness, if there is, then first carry out a roll-in, enter oven for drying, vacuumize rear cooling, then carry out secondary roll-in; If there is not the situation that roll-in thickness rebounds, be then introduced into oven for drying, vacuumize rear cooling, then carry out roll-in.
2. the method for solution water system cathode size according to claim 1 roll banding serious problems in nipping process, it is characterized in that: in described steps A, whipping process is divided into two agitation phases, the mixing time of each agitation phases is 1 hour, and the mixing speed of the first agitation phases is greater than the mixing speed of the second agitation phases.
3. the method for solution water system cathode size according to claim 1 roll banding serious problems in nipping process, it is characterized in that: in described steps A, mixing speed is 500 ~ 800rpm.
4. the method for solution water system cathode size according to claim 1 roll banding serious problems in nipping process, is characterized in that: in described step B, and the speed of first pass coating is greater than the speed of second time coating.
5. the method for solution water system cathode size according to claim 4 roll banding serious problems in nipping process, is characterized in that: in described step B, and the speed of first pass coating is 8 ~ 9m/min, and the speed of second time coating is 6 ~ 7.5m/min.
6. the method for solution water system cathode size according to claim 1 roll banding serious problems in nipping process, it is characterized in that: in described step B, the coating temperature of twice coating is: one dries temperature 80 ~ 90 DEG C, two dry temperature 80 ~ 90 DEG C, three dry temperature 100 DEG C, and four dry temperature 90 ~ 100 DEG C, and five dry temperature 80 ~ 90 DEG C, six dry temperature 70 ~ 80 DEG C, and seven dry temperature 70 ~ 80 DEG C.
7. the method for solution water system cathode size according to claim 6 roll banding serious problems in nipping process, it is characterized in that: in described step B, the coating temperature of twice coating is: one dries temperature 85 DEG C, two dry temperature 85 DEG C, three dry temperature 100 DEG C, and four dry temperature 95 DEG C, and five dry temperature 85 DEG C, six dry temperature 75 DEG C, and seven dry temperature 75 DEG C.
8. the method for solution water system cathode size according to claim 1 roll banding serious problems in nipping process, is characterized in that: in described step C, and the bake out temperature of baking oven is 100 ~ 110 DEG C, and drying time is 4 ~ 8 hours.
9. the method for solution water system cathode size according to claim 1 roll banding serious problems in nipping process, it is characterized in that: in described step C, no matter detect the situation whether graphite there will be the bounce-back of roll-in thickness, vacuumize after being all cooled to 50 ~ 60 DEG C, carry out roll-in.
10. the method for solution water system cathode size according to claim 3 roll banding serious problems in nipping process, it is characterized in that: in described steps A, the ratio of SBR is the mixing speed of the 2.3%, first agitation phases is 800rpm, and the mixing speed of the second agitation phases is 500rpm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106654154A (en) * | 2016-12-26 | 2017-05-10 | 浙江瓦力新能源科技有限公司 | Water-based ion battery plate manufacturing process |
| CN110323082A (en) * | 2019-07-30 | 2019-10-11 | 重庆中科超容科技有限公司 | A kind of preparation method of electrical double layer capacitor electrodes piece |
| CN110931704A (en) * | 2019-11-21 | 2020-03-27 | 安徽益佳通电池有限公司 | Method for improving rolling and roll sticking of lithium ion battery cathode |
| CN112909221A (en) * | 2021-02-06 | 2021-06-04 | 湖南华兴新能源科技有限公司 | Secondary baking process after rolling of cylindrical lithium ion battery cathode |
| EP4106050A4 (en) * | 2021-02-26 | 2023-10-18 | LG Chem, Ltd. | Anode for secondary battery, preparation method therefor, and lithium secondary battery comprising same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP4106050A4 (en) * | 2021-02-26 | 2023-10-18 | LG Chem, Ltd. | Anode for secondary battery, preparation method therefor, and lithium secondary battery comprising same |
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