CN102891282B - Cathode preparation technique of lithium ion battery - Google Patents
Cathode preparation technique of lithium ion battery Download PDFInfo
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- CN102891282B CN102891282B CN201110205382.8A CN201110205382A CN102891282B CN 102891282 B CN102891282 B CN 102891282B CN 201110205382 A CN201110205382 A CN 201110205382A CN 102891282 B CN102891282 B CN 102891282B
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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
Abstract
A kind of cathode preparation technique of lithium ion battery, be included in a mixing bowl by recipe ratio add thickener, conductive agent and 1/2 negative electrode active material, stir 30 ± 15 minutes; The negative electrode active material adding residue 1/2 carries out stirring at low speed 10 ± 5 minutes, scraper after stirring, and high-speed stirred 30 ± 15 minutes is even to slurry again; Solvent described in interpolation, stirring at low speed 10 ± 5 minutes, scraper, again high-speed stirred 30 ± 15 minutes, preserve; Then 80 ± 5 DEG C are warming up to, high-speed stirred 45 ± 5 minutes; Cooling; Add recipe ratio weight binding agent again, high-speed stirred 60 ± 15 minutes, cooling, makes slurry be cooled to 25 ~ 45 DEG C, preserves.The invention solves the problem that the current lithium ion battery distributing process time is long, utilization rate of equipment and installations is low and output is low, the lithium ion battery distributing process time is controlled at five hours, both improve utilization rate of equipment and installations, again reduced cost, and do not affect battery performance.
Description
Technical field
The invention belongs to lithium ion battery distributing production technology, be specifically related to cathode blending and be dry mixed the improvement of process and the interpolation of high-temperature process.
Background technology
Along with the development of the science and technology such as electronics, aviation and automobile, oil, exhaustion, the global problem such as air pollution and greenhouse effect of the non-renewable fossil fuel such as natural gas receive publicity day by day, based on the development level of energy technology, even solving these global problems to alleviate, at present the demand of energy-conserving and environment-protective portable power source being increased fast.Because lithium ion battery has the advantage of high voltage, high power capacity, and have extended cycle life, security performance is good, make it have broad application prospects in many-sides such as portable electric appts, electric automobile, space technology, national defense industry, become the study hotspot widely paid close attention in recent years.
The mechanism generality of lithium ion battery is thought, lithium ion battery refers to respectively with the secondary cell that the compound of two reversibly Infix and desfix lithium ions is formed as both positive and negative polarity as a kind of chemical power source, when battery charges, lithium ion is deintercalation from positive pole, embed in negative pole, otherwise during electric discharge.Physical Mechanism involved by lithium ion battery, at present to embed physics in solid-state physics to explain, embed (intercalation) and refer to that moveable object particle (molecule, atom, ion) is reversibly embedded on the network lattice vacancy that has in the host lattice of suitable dimension.
Good distribution can guarantee that battery lithium ion when charging can normally embed graphite-structure layer, and during electric discharge, lithium ion normal deintercalation can enter positive pole, guarantees that not stopping discharge and recharge positive and negative pole material lattice does not for a long time subside, and guarantees that the battery energy long-life normally works.
In prior art, the lithium ion battery negative batching production technology time is long, and need ten hours, utilization rate of equipment and installations is low.Because the demand of lithium ion battery is in continuous growth, therefore under the prerequisite ensureing battery performance, seek new production technology particularly important to improve production output and to shorten the both positive and negative polarity proportioning process time.
Summary of the invention
The object of the present invention is to provide a kind of batching time short, the cathode preparation technique of lithium ion battery that utilization rate of equipment and installations is high and cost rate is low.
Technical solution of the present invention is: a kind of cathode preparation technique of lithium ion battery, and its parts by weight of raw materials proportioning is:
Binding agent: 0.5 ~ 1.7;
Thickener: 0 ~ 1.3;
Conductive agent: 0.5 ~ 0.7;
Negative electrode active material: 44.0 ~ 51.0;
Solvent: 45.3 ~ 55.0;
Described thickener comprises: sodium carboxymethylcellulose (CMC);
Described binding agent comprises: PVA(polyvinyl alcohol), PTFE(polytetrafluoroethylene), CMC(sodium carboxymethylcellulose), PVDF(Kynoar), SBR(butadiene-styrene rubber), Viton, polyurethane, LA(polyacrylonitrile copolymer);
Described conductive agent: KS(graphite agent), the agent of SP(carbon black conductive);
Described negative electrode active material: NG(native graphite), AG(Delanium), CG(composite graphite);
Described solvent: deionized water, NMP(N-methyl pyrrolidone);
Its operation is:
siccative mixing one: the negative electrode active material adding thickener, conductive agent and 1/2 recipe ratio weight in a mixing bowl by recipe ratio, stirs 30 ± 15 minutes;
siccative mixing two: rise a mixing bowl, in operation
the negative electrode active material adding residue 1/2 recipe ratio weight in obtained slurry carries out stirring at low speed 10 ± 5 minutes, scraper after stirring, and high-speed stirred 30 ± 15 minutes is even to slurry again;
add solvent dispersion: in operation
add described solvent, stirring at low speed 10 ± 5 minutes, scraper, high-speed stirred 30 ± 15 minutes again in obtained slurry, preserve;
high-temperature process: pass into 80 ± 5 DEG C of recirculated waters and make operation in the chuck of mixing plant (carry and add circulating water device)
obtained slurry is warming up to 80 ± 5 DEG C, high-speed stirred 45 ± 5 minutes; Or by operation
obtained slurry toasts 45 ± 5 minutes under 80 ± 5 DEG C of high temperature, then continues high-speed stirred 60 ± 15 minutes, makes slurry be cooled to 45 ~ 60 DEG C to passing into cooling water in the chuck of a mixing bowl, preserves;
add binding agent: get operation
obtained slurry adds recipe ratio weight binding agent, high-speed stirred 60 ± 15 minutes, makes slurry be cooled to 25 ~ 45 DEG C to passing into water in the chuck of a mixing bowl, preserves.
Described operation also comprises
particle screen selecting: to operation
obtained slurry carries out viscosity test, and viscosity is qualified sieves afterwards to slurry, removing bulky grain in case coating time cause broken belt.
Thickener consumption of the present invention is 0.5 ~ 1.0 part, weight portion.
When raw material binding agent of the present invention is polyacrylonitrile copolymer, thickener consumption can be 0.
Stirring at low speed speed of the present invention is revolution 15 ± 5HZ, rotation 10 ± 2HZ; High-speed stirred speed is revolution 35 ± 5HZ, rotation 30 ± 5HZ.
Operation of the present invention
described in scraper concrete operations be scrape in a mixing bowl stirring the remaining slurry material scraping plate that splashes on slurry and mixer of casing wall.
The present invention removes
siccative mixed processes other operations outer stir and leave standstill to preserve carries out all under vacuo.
The sodium salt of carboxymethyl cellulose ether, belongs to anionic cellulose ether, is white or milky fibrous powder or particle, density 0.5-0.7g/cm
3, almost odorless, tasteless, has moisture absorption, be easy to be dispersed in water into clear gum solution, insoluble in the organic solvents such as ethanol, below 20 DEG C, viscosity rises rapidly, when 45 DEG C, change is comparatively slow, and more than 85 DEG C long-time heating can make its colloid sex change and viscosity and performance obviously decline.Design philosophy of the present invention is that temperature is controlled, below 80 DEG C, to guarantee the consistency of sodium carboxymethylcellulose, improves his activity, can rapid solution.
Polyacrylonitrile outward appearance is white powder, and density is 1.14 ~ 1.15g/cm
3concurrent solution estranged is softened when being heated to 220 ~ 300 DEG C, vitrification point about 90 DEG C, it is dissolved in dimethyl formamide, dimethyl sulfoxide (DMSO), sulfolane, nitric acid ethylidene ester polar organic solvent, can also be dissolved in the special solvent such as fortified aqueous and red fuming nitric acid (RFNA) of the inorganic salts such as rhodanate, perchlorate, zinc chloride, lithium bromide.So the temperature that batching and binding agent dissolve preferably controls below 90 DEG C.
The invention solves that the current lithium ion battery distributing process time is long, utilization rate of equipment and installations is low and output these three problems low.The lithium ion battery distributing process time is controlled at five hours, is roughly 1/2nd of the prior art batching time, both improves utilization rate of equipment and installations like this, again reduce cost, and do not affect battery performance.
Embodiment
embodiment 1
Thickener: CMC(sodium carboxymethylcellulose) 0.5wt%;
Binding agent: SBR(butadiene-styrene rubber) 1.2wt%;
Conductive agent: SP(carbon black conductive agent) 0.5wt%;
Negative electrode active material: AG(Delanium) 44.4wt%;
Solvent: H
2o(deionized water) 53.4wt%;
siccative mixes: pill tank adds above-mentioned formula rate: thickener CMC, conductive agent SP and inventory 50.0wt% negative electrode active material AG stirring at low speed 30 minutes, preserves;
in above-mentioned slurry, add the first stirring at low speed of another 50.0wt% negative electrode active material AG again 10 minutes, scraper, then high-speed stirred 30 minutes is even to slurry, preserves;
add solvent H
2o dispersed paste: add solvent H above-mentioned completing in slurry
2o, stirring at low speed 10 minutes, scraper, then high-speed stirred 30 minutes, preserve;
high-temperature process: add heat recirculated water and make slurry be warming up to 80 DEG C in mixing plant (carry and add circulating water device), carry out high-speed stirred again 45 minutes, or slurry is carried out the process in 45 minutes of 80 DEG C of high-temperature bakings, scraper, continue to carry out high-speed stirred 60 minutes to slurry, adding recirculated water to a mixing bowl makes slurry be cooled to 35 DEG C, preserves;
add binding agent: in the above-mentioned slurry completed, add recipe ratio weight binding agent SBR carry out high-speed stirred 60 minutes, recirculated water is added to a mixing bowl and makes slurry be cooled to 25 DEG C, preserve;
particle screen selecting: viscosity test is carried out to the slurry completed above, viscosity is qualified sieves afterwards to slurry, removing bulky grain in case coating time cause broken belt.
embodiment 2
Binding agent: LA (polyacrylonitrile copolymer) 1.6wt%;
Conductive agent: SP(carbon black conductive agent) 0.5wt%;
Negative electrode active material: AG(Delanium) 50.5wt%
Solvent: H
2o(deionized water) 47.4wt%
siccative mixes: pill tank adds above-mentioned recipe ratio weight: binding agent LA, conductive agent SP and 50.0wt% negative electrode active material AG stirring at low speed 30 minutes, preserves;
another 50.0wt% negative electrode active material AG is added again, first stirring at low speed 10 minutes, scraper in above-mentioned slurry, more even to slurry to slurry high-speed stirred 30 minutes, preserve;
add solvent H
2o dispersed paste: add solvent H above-mentioned completing in slurry
2o, stirring at low speed 10 minutes, scraper, then high-speed stirred 30 minutes, preserve;
high-temperature process: slurry is warming up to 80 DEG C of high-speed stirred 45 minutes by mixing plant recirculated water, scraper, carries out high-speed stirred 120 minutes to slurry again, adds recirculated water make slurry be cooled to 40 DEG C to a mixing bowl,
Preserve;
5. particle screen selecting: viscosity test is carried out to the slurry completed above, viscosity is qualified sieves afterwards to slurry, removing bulky grain in case coating time cause broken belt.
embodiment 3
Binding agent: PVDF (Kynoar) 1.5wt%
Conductive agent: SP(carbon black conductive agent) 0.7wt%;
Negative electrode active material: CG (composite graphite) 47.7wt%
Solvent: NMP(N-methyl pyrrolidone) 50.0wt%
siccative mixes: pill tank adds above-mentioned recipe ratio weight: binding agent PVDF, conductive agent SP and 50.0wt% negative electrode active material CG low speed 30 minutes, preserves;
the first stirring at low speed of another 50.0wt% negative electrode active material CG is added again 5 minutes, scraper in above-mentioned slurry, more even to slurry to slurry high-speed stirred 40 minutes, preserve;
add solvent NMP dispersed paste: add solvent NMP above-mentioned completing in slurry, stirring at low speed 10 minutes, scraper, then high-speed stirred 30 minutes, preserve;
high-temperature process: slurry is carried out the process of 40 minutes of 80 DEG C of high-temperature bakings, scraper, again carry out high-speed stirred 120 minutes to slurry, adds recirculated water to a mixing bowl and makes slurry be cooled to 45 DEG C, preserves;
5. particle screen selecting: viscosity test is carried out to the slurry completed above, viscosity is qualified sieves afterwards to slurry, removing bulky grain in case coating time cause broken belt.
Claims (7)
1. a cathode preparation technique of lithium ion battery, its parts by weight of raw materials proportioning is:
Binding agent: 0.5 ~ 1.7;
Thickener: 0 ~ 1.3;
Conductive agent: 0.5 ~ 0.7;
Negative electrode active material: 44.0 ~ 51.0;
Solvent: 45.3 ~ 55.0;
Described thickener comprises sodium carboxymethylcellulose;
Described binding agent comprises polyvinyl alcohol, polytetrafluoroethylene, sodium carboxymethylcellulose, polyolefin, Kynoar, butadiene-styrene rubber, Viton, polyurethane or polyacrylonitrile copolymer;
Described conductive agent comprises graphite agent or carbon black conductive agent;
Described negative electrode active material comprises native graphite, Delanium or composite graphite;
Described solvent comprises deionized water or 1-METHYLPYRROLIDONE;
Its operation comprises:
siccative mixing one: the negative electrode active material adding thickener, conductive agent and 1/2 recipe ratio weight in a mixing bowl by recipe ratio, stirs 30 ± 15 minutes;
siccative mixing two: in operation
the negative electrode active material adding residue 1/2 recipe ratio weight in obtained slurry carries out stirring at low speed 10 ± 5 minutes, scraper after stirring, and high-speed stirred 30 ± 15 minutes is even to slurry again;
add solvent dispersion: in operation
add described solvent, stirring at low speed 10 ± 5 minutes, scraper, high-speed stirred 30 ± 15 minutes again in obtained slurry, preserve;
high-temperature process: heat up, make operation
obtained slurry is warming up to 80 ± 5 DEG C, high-speed stirred 45 ± 5 minutes; Or by operation
obtained slurry toasts 45 ± 5 minutes under 80 ± 5 DEG C of high temperature, then continues high-speed stirred 60 ± 15 minutes, then makes slurry be cooled to 45 ~ 60 DEG C, preserves;
add binding agent: get operation
obtained slurry adds recipe ratio weight binding agent, high-speed stirred 60 ± 15 minutes, then makes slurry be cooled to 25 ~ 45 DEG C, preserves.
2. cathode preparation technique of lithium ion battery according to claim 1, is characterized in that: described operation also comprises
particle screen selecting: to operation
obtained slurry carries out viscosity test, and viscosity is qualified sieves afterwards to slurry, removing bulky grain in case coating time cause broken belt.
3. cathode preparation technique of lithium ion battery according to claim 1, is characterized in that: described thickener consumption is 0.5 ~ 1.0 part, weight portion.
4. cathode preparation technique of lithium ion battery according to claim 1, is characterized in that: when described raw material binding agent is polyacrylonitrile copolymer, and thickener consumption is 0.
5. cathode preparation technique of lithium ion battery according to claim 1, is characterized in that: described stirring at low speed speed is revolution 15 ± 5HZ, rotation 10 ± 2HZ; High-speed stirred speed is revolution 35 ± 5HZ, rotation 30 ± 5HZ.
6. cathode preparation technique of lithium ion battery according to claim 1, is characterized in that: operation
, operation
described in scraper concrete operations be scrape in a mixing bowl stirring the remaining slurry material scraping plate that splashes on slurry and mixer of casing wall.
7. cathode preparation technique of lithium ion battery according to claim 1, is characterized in that: remove
,
siccative mixed processes other operations outer stir and leave standstill to preserve carries out all under vacuo.
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| CN201110205382.8A CN102891282B (en) | 2011-07-21 | 2011-07-21 | Cathode preparation technique of lithium ion battery |
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| CN201110205382.8A CN102891282B (en) | 2011-07-21 | 2011-07-21 | Cathode preparation technique of lithium ion battery |
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| CN102891282B true CN102891282B (en) | 2015-12-09 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103296254A (en) * | 2013-04-16 | 2013-09-11 | 江苏力天新能源科技有限公司 | Preparation method for lithium ion battery negative pole slurry |
| CN104409736A (en) * | 2014-11-14 | 2015-03-11 | 无锡信大气象传感网科技有限公司 | Lithium ion battery anode material and manufacturing method thereof |
| CN105047854B (en) * | 2015-06-30 | 2017-11-10 | 保定风帆新能源有限公司 | A kind of lithium ion battery cathode slurry preparation method |
| CN106486643A (en) * | 2015-11-25 | 2017-03-08 | 上海杉杉科技有限公司 | A kind of preparation technology of lithium cell cathode material |
| CN108305987B (en) * | 2018-01-31 | 2021-02-09 | 北京国能电池科技股份有限公司 | Proportioning process of lithium ion battery negative electrode slurry, lithium ion battery negative electrode sheet and lithium ion battery |
| CN108539121A (en) * | 2018-04-16 | 2018-09-14 | 江西迪芯能源科技有限公司 | A kind of lithium ion battery anode slurry and lithium ion battery |
| CN109768253A (en) * | 2019-01-11 | 2019-05-17 | 合肥国轩高科动力能源有限公司 | A kind of proportioning process of lithium ion battery negative material |
| CN111554937A (en) * | 2020-05-26 | 2020-08-18 | 苏州凌威新能源科技有限公司 | Negative electrode slurry, negative electrode sheet and preparation method thereof |
| CN111725508A (en) * | 2020-06-22 | 2020-09-29 | 湖北亿纬动力有限公司 | Preparation method of negative electrode slurry without glue solution, obtained negative electrode slurry and application |
| CN112072093A (en) * | 2020-09-18 | 2020-12-11 | 天科新能源有限责任公司 | Lithium battery negative electrode slurry with good dispersion effect and preparation method thereof |
| CN115602807B (en) * | 2022-09-08 | 2023-10-31 | 中国新型建材设计研究院有限公司 | Industrial preparation method of carbon-coated silicon oxide negative electrode material |
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| CN101459237B (en) * | 2007-12-10 | 2012-08-08 | 深圳市比克电池有限公司 | Battery cathode slurry, preparation and battery produced by the cathode slurry |
| CN101609882A (en) * | 2009-07-17 | 2009-12-23 | 江苏富朗特新能源有限公司 | A kind of lithium ion battery cathode slurry and preparation method thereof |
| CN101615668A (en) * | 2009-08-07 | 2009-12-30 | 焦作市亿星锂电厂 | Be used to produce the distribution of lithium battery |
| KR101198295B1 (en) * | 2009-10-22 | 2012-11-07 | 주식회사 엘지화학 | A forming method of anode active material layer of a lithium secondary battery, and an anode of lithium secondary battery formed therefrom and a lithium secondary battery having the same |
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