CN104617302A - High-power lithium ion battery anode binder combination and manufacturing method thereof - Google Patents
High-power lithium ion battery anode binder combination and manufacturing method thereof Download PDFInfo
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- CN104617302A CN104617302A CN201510014203.0A CN201510014203A CN104617302A CN 104617302 A CN104617302 A CN 104617302A CN 201510014203 A CN201510014203 A CN 201510014203A CN 104617302 A CN104617302 A CN 104617302A
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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 relates to a high-power lithium ion battery anode binder combination and a manufacturing method thereof. The high-power lithium ion battery anode binder combination comprises the following components in percentage by weight: 10.0-25.0 percent of SBR (Styrene Butadiene Rubber), 10.0-25.0 percent of SIS (Styrene-Isoprene-Styrene thermoplastic copolymer), 1.0-5.0 percent of dispersing agent and 50.0-70.0 percent of deionized water. The pH value of the combination is 4.0-8.0, and the viscosity of the combination is 5.0-50.0 mPa/s. A binder is scientifically prepared by the application of a special formula, the better dispersibility of the binder in a negative active substance is successfully realized, the adhesion and the uniformity of slurry prepared by mixing the negative active substance and the binder and a copper foil are improved, and the adding amount of the binder in the negative active substance is greatly reduced. Therefore, the service life of the battery is obviously prolonged, and the production cost is reduced.
Description
Technical field
The present invention relates to a kind of binding agent, particularly relate to a kind of high power lithium ion cell negative electrode binder and manufacture method thereof.
Background technology
Along with the development of lithium battery industry, the large increase of the huge market demand of high power lithium battery in recent years.High power lithium battery is mainly used in hybrid vehicle and other needs the occasion of high current charge-discharge.Concerning used as negative electrode of Li-ion battery binding agent, existing based on the composition of PVDF (Kynoar), CMC (carboxymethyl cellulose), SBR (butadiene-styrene rubber), there are the following problems: binding agent use amount is more, the poor adhesion of active material and binding agent dispersiveness is poor, active material and binding agent are mixed slurry and Copper Foil, causes the internal resistance of battery to reduce higher useful life.
Summary of the invention
The object of this invention is to provide a kind of high power lithium ion cell negative electrode binder and manufacture method thereof, this binding agent significantly can reduce adhesiveness and the uniformity of the use amount of binding agent, the slurry having good dispersiveness, raising active material and binding agent to be mixed in active material and Copper Foil, extending battery life.
Object of the present invention is achieved through the following technical solutions:
High power lithium ion cell negative electrode binder, be made up of SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethene thermoplastic copolymer), dispersant and deionized water, its content: SBR (butadiene-styrene rubber) 10.0% ~ 25.0%, SIS (styrene-isoprene-phenylethene thermoplastic copolymer) 10.0% ~ 25.0%, dispersant 1.0% ~ 5.0%, deionized water 50.0% ~ 70.0%.Composition pH value is 4.0 ~ 8.0.Composition viscosity is 5.0-50.0mPas.
Further, above-mentioned high power lithium ion cell negative electrode binder, its component has following percentage by weight: SBR (butadiene-styrene rubber) 15.0% ~ 19.0%, SIS (styrene-isoprene-phenylethene thermoplastic copolymer) 15.0% ~ 19.0%, dispersant 1.5% ~ 3.0%, deionized water 57.0% ~ 63.0%.Composition pH value is 5.0 ~ 7.0.Composition viscosity is 8.0-20.0mPas.
Further, above-mentioned high power lithium ion cell negative electrode binder, the molecular weight of described SBR (butadiene-styrene rubber) is 100000 ~ 200000, and the particle diameter of butadiene-styrene rubber is less than 0.1 μm.
Further, above-mentioned high power lithium ion cell negative electrode binder, the hardness of described SIS (styrene-isoprene-phenylethene thermoplastic copolymer) is greater than 30.
Further, above-mentioned high power lithium ion cell negative electrode binder, described dispersant is polyethylene glycol, and mean molecule quantity is 400-1500, hydroxyl value 70-300.
Further, the manufacture method of above-mentioned high power lithium ion cell negative electrode binder, it is characterized in that: first deionized water is added in dispersion pot, add SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethene thermoplastic copolymer), dispersant under stirring, be heated to 80 DEG C, constant temperature stirs 5 hours, it is made to be uniformly dissolved completely, be cooled to room temperature, filter, discharging.
Outstanding substantive distinguishing features and the significant progress of technical solution of the present invention are mainly reflected in:
1. the present invention adopts unique scientific formulation preparation binding agent, adopt molecular weight 100000 ~ 200000, particle diameter is less than SIS (styrene-isoprene-phenylethene thermoplastic copolymer) that the SBR (butadiene-styrene rubber) of 0.1 μm and hardness is greater than 30 Main Components as binding agent.The molecular weight of control SBR (butadiene-styrene rubber) and particle diameter can reduce the viscosity of composition, improve the dispersiveness of binding agent in active material, the hardness of control SIS (styrene-isoprene-phenylethene thermoplastic copolymer), can improve the adhesiveness of slurry that active material and binding agent be mixed and Copper Foil greatly.Employing mean molecule quantity is the polyethylene glycol of 400-1500, hydroxyl value 70-300, SBR and SIS can be made to be scattered in equably in water, regulates the pH value of adhesive composition, the adhesion strength of the slurry that raising active material and binding agent are mixed and Copper Foil and uniformity.
2. adopt binding agent of the present invention can reduce the use amount of binding agent, the ratio that binding agent accounts for slurry is 1.0% ~ 1.5%.
Embodiment:
High power lithium ion cell negative electrode binder, be made up of SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethene thermoplastic copolymer), polyethylene glycol and deionized water, its content: SBR (butadiene-styrene rubber) 10.0% ~ 20.0%, SIS (styrene-isoprene-phenylethene thermoplastic copolymer) 10.0% ~ 20.0%, polyethylene glycol 1.0% ~ 5.0%, deionized water 50.0% ~ 70.0%.Composition pH value is 4.0 ~ 8.0.Composition viscosity is 5.0-50.0mPas.
Desirable high power lithium ion cell negative electrode binder, its component has following percentage by weight: SBR (butadiene-styrene rubber) 15.0% ~ 19.0%, SIS (styrene-isoprene-phenylethene thermoplastic copolymer) 15.0% ~ 19.0%, polyethylene glycol 1.5% ~ 3.0%, deionized water 57.0% ~ 63.0%.Composition pH value is 5.0 ~ 7.0.Composition viscosity is 8.0-20.0mPas.
The manufacture method of high power lithium ion cell negative electrode binder, it is characterized in that: first deionized water is added in dispersion pot, SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethene thermoplastic copolymer), dispersant is added under stirring, be heated to 80 DEG C, constant temperature stirs 5 hours, makes it be uniformly dissolved completely, is cooled to room temperature, filter, discharging.
When binding agent of the present invention is used for anode plate for lithium ionic cell making: by negative electrode active material (being generally graphite) and binding agent and deionized water mixing and stirring processing procedure cathode size in proportion, by coating machine, cathode size is coated in copper foil surface equably, after drying, cuts into negative plate.
Embodiment 1:
First 60.0kg deionized water is added in dispersion pot, 19.0kgSBR (butadiene-styrene rubber), 19.0kgSIS (styrene-isoprene-phenylethene thermoplastic copolymer), 2.0kg polyethylene glycol is added under stirring, be heated to 80 DEG C of constant temperature and stir 5 hours, it is made to dissolve completely, filter, discharging, obtains binding agent.The wherein molecular weight 150000 of SBR (butadiene-styrene rubber), particle diameter 0.09 μm; The intensity of SIS (styrene-isoprene-phenylethene thermoplastic copolymer) is 40; The molecular weight of polyethylene glycol is 1000, and hydroxyl value is 110; Solution pH value is 5.5, and viscosity is 15mPas.
Embodiment 2:
First 62.0kg deionized water is added in dispersion pot, 18.0kgSBR (butadiene-styrene rubber), 17.0kgSIS (styrene-isoprene-phenylethene thermoplastic copolymer), 3.0kg polyethylene glycol is added under stirring, be heated to 80 DEG C of constant temperature and stir 5 hours, it is made to dissolve completely, filter, discharging, obtains binding agent.The wherein molecular weight 200000 of SBR (butadiene-styrene rubber), particle diameter 0.08 μm; The intensity of SIS (styrene-isoprene-phenylethene thermoplastic copolymer) is 45; The molecular weight of polyethylene glycol is 800, and hydroxyl value is 135; Solution pH value is 6.0, and viscosity is 10mPas.
Embodiment 3:
First 61.0kg deionized water is added in dispersion pot, 17.0kgSBR (butadiene-styrene rubber), 19.0kgSIS (styrene-isoprene-phenylethene thermoplastic copolymer), 3.0kg polyethylene glycol is added under stirring, be heated to 80 DEG C of constant temperature and stir 5 hours, it is made to dissolve completely, filter, discharging, obtains binding agent.The wherein molecular weight 100000 of SBR (butadiene-styrene rubber), particle diameter 0.1 μm; The intensity of SIS (styrene-isoprene-phenylethene thermoplastic copolymer) is 35; The molecular weight of polyethylene glycol is 600, and hydroxyl value is 180; Solution pH value is 6.5, and viscosity is 18mPas.
Comparative example:
First 60.0kg deionized water added in dispersion pot, under stirring, add 40.0kgSBR (butadiene-styrene rubber), be heated to 80 DEG C of constant temperature and stir 5 hours, make it dissolve completely, filter, discharging, obtain binding agent.The wherein molecular weight 300000 of SBR (butadiene-styrene rubber), particle diameter 0.2 μm; Solution pH value is 7.0, and viscosity is 65mPas.
By embodiment 1, embodiment 2, embodiment 3 and comparative example respectively with graphite and deionized water in binding agent: graphite: deionized water=1: 99: 100 ratio mixing and stirring make cathode size, by coating machine, cathode size is coated in copper foil surface equably, after drying, cuts into negative plate.Peel strength tester is used to test its peel strength respectively.
After testing, peel strength the results are shown in Table 1.
Table 1
| Test item | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example |
| Peel strength (N/m) | 7973 | 7869 | 8004 | 4237 |
By comparative example and graphite and deionized water in binding agent: graphite: deionized water=4: 96: 100 ratio mixing and stirring make cathode size, by coating machine, cathode size is coated in copper foil surface equably, negative plate and embodiment 1 and graphite and deionized water is cut in binding agent: graphite: deionized water=1: 99: 100 ratio mixing and stirring make cathode size after drying, by coating machine, cathode size is coated in copper foil surface equably, after drying, cuts into negative plate.Peel strength tester is used to test its peel strength respectively.
After testing, peel strength the results are shown in Table 2.
Table 2
| Test item | Embodiment 1 | Comparative example |
| Peel strength (N/m) | 7973 | 5724 |
The present invention uses unique scientific formula to carry out the preparation of science to SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethene thermoplastic copolymer), dispersant, the molecular weight of control SBR (butadiene-styrene rubber) and particle diameter reduce the viscosity of composition, improve the dispersiveness of binding agent in active material, the hardness of control SIS (styrene-isoprene-phenylethene thermoplastic copolymer), can improve the adhesiveness of slurry that active material and binding agent be mixed and Copper Foil greatly.Control molecular weight and the hydroxyl value of polyethylene glycol, SBR and SIS is scattered in water equably, regulate the pH value of adhesive composition, the adhesion strength of the slurry that raising active material and binding agent are mixed and Copper Foil and uniformity.
Use binding agent of the present invention, successfully achieve the significantly reduction of the addition of binding agent in negative electrode active material.Thus, significantly increase the useful life of battery.Reduce production cost.
More than specifically describe the application example of technical solution of the present invention, they only provide as an example, are not considered as limiting application of the present invention.The equivalent replacement of all operating conditions, all drops within protection scope of the present invention.
Claims (6)
1. a high power lithium ion cell negative electrode binder composition, it is characterized in that comprising following composition (percentage by weight): SBR (butadiene-styrene rubber) 10.0% ~ 25.0%, SIS (styrene-isoprene-phenylethene thermoplastic copolymer) 10.0% ~ 25.0%, dispersant 1.0% ~ 5.0%, deionized water 50.0% ~ 70.0%.Composition pH value is 4.0 ~ 8.0.Composition viscosity is 5.0-50.0mPa.s.
2. high power lithium ion cell negative electrode binder composition according to claim 1, it is characterized in that its component has following percentage by weight: SBR (butadiene-styrene rubber) 15.0% ~ 19.0%, SIS (styrene-isoprene-phenylethene thermoplastic copolymer) 15.0% ~ 19.0%, dispersant 1.5% ~ 3.0%, deionized water 57.0% ~ 63.0%.Composition pH value is 5.0 ~ 7.0.Composition viscosity is 8.0-20.0mPa.s.
3. high power lithium ion cell negative electrode binder composition according to claim 1 and 2, is characterized in that: the molecular weight of described SBR (butadiene-styrene rubber) is 100000 ~ 200000, and the particle diameter of butadiene-styrene rubber is less than 0.1 μm.
4. high power lithium ion cell negative electrode binder composition according to claim 1 and 2, is characterized in that: the hardness of described SIS (styrene-isoprene-phenylethene thermoplastic copolymer) is greater than 30.
5. high power lithium ion cell negative electrode binder composition according to claim 1 and 2, it is characterized in that: described dispersant is polyethylene glycol, mean molecule quantity is 400-1500, hydroxyl value 70-300.
6. high power lithium ion cell negative electrode binder composition according to claim 1 and 2, it is characterized in that: first deionized water is added in dispersion pot, SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethene thermoplastic copolymer), dispersant is added under stirring, be heated to 80 DEG C, constant temperature stirs 5 hours, makes it be uniformly dissolved completely, is cooled to room temperature, filter, discharging.
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Citations (5)
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|---|---|---|---|---|
| CN1353873A (en) * | 1999-04-09 | 2002-06-12 | Basf公司 | Composite body suitable for utilization as lithium ion battery |
| JP2006134777A (en) * | 2004-11-08 | 2006-05-25 | Erekuseru Kk | Positive electrode for lithium battery and lithium battery using this |
| CN101151748B (en) * | 2005-02-08 | 2010-10-06 | 三菱化学株式会社 | Lithium secondary battery and its anode material |
| CN103242595A (en) * | 2012-02-09 | 2013-08-14 | 三星Sdi株式会社 | Composite binder for battery, and anode and battery including the composite |
| WO2014133063A1 (en) * | 2013-02-28 | 2014-09-04 | 日産自動車株式会社 | Positive electrode active material, positive electrode material, positive electrode, and non-aqueous electrolyte secondary battery |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1353873A (en) * | 1999-04-09 | 2002-06-12 | Basf公司 | Composite body suitable for utilization as lithium ion battery |
| JP2006134777A (en) * | 2004-11-08 | 2006-05-25 | Erekuseru Kk | Positive electrode for lithium battery and lithium battery using this |
| CN101151748B (en) * | 2005-02-08 | 2010-10-06 | 三菱化学株式会社 | Lithium secondary battery and its anode material |
| CN103242595A (en) * | 2012-02-09 | 2013-08-14 | 三星Sdi株式会社 | Composite binder for battery, and anode and battery including the composite |
| WO2014133063A1 (en) * | 2013-02-28 | 2014-09-04 | 日産自動車株式会社 | Positive electrode active material, positive electrode material, positive electrode, and non-aqueous electrolyte secondary battery |
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Address after: No. 501, Minfeng Road, Wuzhong District, Suzhou, Jiangsu 215124 Patentee after: Ruihong (Suzhou) Electronic Chemicals Co.,Ltd. Address before: No. 501, Minfeng Road, Wuzhong District, Suzhou, Jiangsu 215124 Patentee before: SUZHOU RUIHONG ELECTRONIC CHEMICAL CO.,LTD. |