CN104617302B - A kind of high power lithium ion cell negative electrode binder composition and its manufacture method - Google Patents
A kind of high power lithium ion cell negative electrode binder composition and its manufacture method Download PDFInfo
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- CN104617302B CN104617302B CN201510014203.0A CN201510014203A CN104617302B CN 104617302 B CN104617302 B CN 104617302B CN 201510014203 A CN201510014203 A CN 201510014203A CN 104617302 B CN104617302 B CN 104617302B
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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
The present invention relates to a kind of high power lithium ion cell negative electrode binder and its manufacture method.Consisting of：SBR (butadiene-styrene rubber) 10.0%~25.0%, SIS (styrene-isoprene-styrene 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.The present invention prepares binding agent with unique scientific formulation, be successfully realized binding agent has the adhesiveness and uniformity of preferable dispersiveness, the slurry that raising negative electrode active material and binding agent are mixed and Copper Foil in negative electrode active material, and addition of the binding agent in negative electrode active material is greatly reduced.So as to significantly increase the service life of battery.Reduce production cost.
Description
Technical field
The present invention relates to a kind of binding agent, more particularly to a kind of high power lithium ion cell negative electrode binder and its manufacturer
Method.
Background technology
With the development of lithium battery industry, the in recent years big increase of the huge market demand of high power lithium battery.High-power lithium
Battery is mainly used in hybrid vehicle and other needs the occasion of high current charge-discharge.To used as negative electrode of Li-ion battery binding agent
For, the existing composition based on PVDF (Kynoar), CMC (carboxymethylcellulose calcium), SBR (butadiene-styrene rubber) is deposited
In following problem：Binding agent usage amount is more, active material is poor with binding agent dispersiveness, active material mixes system with binding agent
Into slurry and Copper Foil poor adhesion, cause the internal resistance service life reduction higher of battery.
The content of the invention
It is an object of the invention to provide a kind of high power lithium ion cell negative electrode binder and its manufacture method, the binding agent
The usage amount of binding agent can be greatly decreased, has in active material preferable dispersiveness, improve active material and mix with binding agent
The slurry being made and the adhesiveness and uniformity of Copper Foil, extend battery life.
The purpose of the present invention is achieved through the following technical solutions：
High power lithium ion cell negative electrode binder, by SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethenes
Thermoplastic copolymer), dispersant and deionized water composition, its content：SBR (butadiene-styrene rubber) 10.0%~25.0%, SIS (benzene
Ethene-isoprene styrene 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)
It 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, described SIS (styrene-isoprene-
Styrenic thermoplastic copolymer) hardness be more than 30.
Further, above-mentioned high power lithium ion cell negative electrode binder, described dispersant is polyethylene glycol, averagely
Molecular weight is 400-1500, hydroxyl value 70-300.
Further, the manufacture method of above-mentioned high power lithium ion cell negative electrode binder, it is characterised in that：To first go
Ionized water is added in dispersion pot, and SBR (butadiene-styrene rubber), SIS are added under stirring, and (styrene-isoprene-phenylethene thermoplasticity is total to
Polymers), dispersant, be heated to 80 DEG C, constant temperature is stirred 5 hours, it is completely dissolved uniformly, is cooled to room temperature, is filtered, and is discharged.
The substantive distinguishing features of the protrusion of technical solution of the present invention and significant progress are mainly reflected in：
1. the present invention prepares binding agent using unique scientific formulation, using molecular weight in 100000~200000, particle diameter
The SIS (styrene-isoprene-phenylethene thermoplastic copolymer) of SBR (butadiene-styrene rubber) and hardness more than 30 less than 0.1 μm
As the Main Components of binding agent.The molecular weight and particle diameter of control SBR (butadiene-styrene rubber) can reduce the viscosity of composition, improve
Dispersiveness of the binding agent in active material, the hardness of control SIS (styrene-isoprene-phenylethene thermoplastic copolymer),
The adhesiveness of slurry that active material and binding agent be mixed and Copper Foil can be greatly improved.It is 400- to use mean molecule quantity
1500, the polyethylene glycol of hydroxyl value 70-300 can be such that SBR and SIS is homogeneously dispersed in water, adjust the PH of adhesive composition
Value, slurry and the adhesion strength and uniformity of Copper Foil that raising active material is mixed with binding agent.
2. the usage amount of binding agent can be reduced using binding agent of the invention, the ratio that binding agent accounts for slurry is 1.0%
~1.5%.
Specific embodiment：
High power lithium ion cell negative electrode binder, by SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethenes
Thermoplastic copolymer), polyethylene glycol and deionized water composition, 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%, go from
Sub- water 50.0%~70.0%.Composition pH value is 4.0~8.0.Composition viscosity is 5.0-50.0mPas.
Preferable high power lithium ion cell negative electrode binder, its component has following percentage by weight：SBR (fourths
Benzene 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
8.0-20.0mPa·s。
The manufacture method of high power lithium ion cell negative electrode binder, it is characterised in that：First deionized water is added and is disperseed
In pot, stirring is lower to add SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethene thermoplastic copolymer), dispersant,
80 DEG C are heated to, constant temperature is stirred 5 hours, it is completely dissolved uniformly, is cooled to room temperature, filtered, discharging.
When binding agent of the present invention makes for anode plate for lithium ionic cell：By negative electrode active material (generally graphite) with it is viscous
Agent and deionized water mixing and stirring processing procedure cathode size in proportion are tied, cathode size is uniformly coated on by coating machine
Copper foil surface, cuts into negative plate after drying.
Embodiment 1：
First will during 60.0kg deionized waters add dispersion pot, stirring is lower add 19.0kgSBR (butadiene-styrene rubber),
19.0kgSIS (styrene-isoprene-phenylethene thermoplastic copolymer), 2.0kg polyethylene glycol, are heated to 80 DEG C of constant temperature and stir
Mix 5 hours, be completely dissolved it, filter, discharging obtains binding agent.The molecular weight 150000 of wherein SBR (butadiene-styrene rubber), grain
0.09 μm of footpath；The intensity of SIS (styrene-isoprene-phenylethene thermoplastic copolymer) is 40；The molecular weight of polyethylene glycol is
1000, hydroxyl value is 110；Solution pH value is 5.5, and viscosity is 15mPas.
Embodiment 2：
First will during 62.0kg deionized waters add dispersion pot, stirring is lower add 18.0kgSBR (butadiene-styrene rubber),
17.0kgSIS (styrene-isoprene-phenylethene thermoplastic copolymer), 3.0kg polyethylene glycol, are heated to 80 DEG C of constant temperature and stir
Mix 5 hours, be completely dissolved it, filter, discharging obtains binding agent.The molecular weight 200000 of wherein SBR (butadiene-styrene rubber), grain
0.08 μm of footpath；The intensity of SIS (styrene-isoprene-phenylethene thermoplastic copolymer) is 45；The molecular weight of polyethylene glycol is
800, hydroxyl value is 135；Solution pH value is 6.0, and viscosity is 10mPas.
Embodiment 3：
First will during 61.0kg deionized waters add dispersion pot, stirring is lower add 17.0kgSBR (butadiene-styrene rubber),
19.0kgSIS (styrene-isoprene-phenylethene thermoplastic copolymer), 3.0kg polyethylene glycol, are heated to 80 DEG C of constant temperature and stir
Mix 5 hours, be completely dissolved it, filter, discharging obtains binding agent.The molecular weight 100000 of wherein SBR (butadiene-styrene rubber), grain
0.1 μm of footpath；The intensity of SIS (styrene-isoprene-phenylethene thermoplastic copolymer) is 35；The molecular weight of polyethylene glycol is
600, hydroxyl value is 180；Solution pH value is 6.5, and viscosity is 18mPas.
Comparative example：
First by 60.0kg deionized waters addition dispersion pot, 40.0kgSBR (butadiene-styrene rubber) is added under stirring, 80 are heated to
DEG C constant temperature is stirred 5 hours, is completely dissolved it, is filtered, and discharging obtains binding agent.The molecular weight of wherein SBR (butadiene-styrene rubber)
300000,0.2 μm of particle diameter；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 by binding agent: graphite: goes
Ionized water=1: 99: 100 ratio mixing and stirrings are made cathode size, are uniformly coated on cathode size by coating machine
Copper foil surface, cuts into negative plate after drying.Test its peel strength respectively using peel strength tester.
After testing, peel strength the results are shown in Table 1.
Table 1
| Detection project | 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 ratios are mixed
Cathode size uniformly is made, cathode size is uniformly coated on by copper foil surface by coating machine, negative pole is cut into after drying
Piece and embodiment 1 are with graphite and deionized water in binding agent: graphite: deionized water=1: 99: 100 ratio mixing and stirring systems
Into cathode size, cathode size is uniformly coated on by copper foil surface by coating machine, negative plate is cut into after drying.Use
Peel strength tester tests its peel strength respectively.
After testing, peel strength the results are shown in Table 2.
Table 2
| Detection project | Embodiment 1 | Comparative example |
| Peel strength (N/m) | 7973 | 5724 |
The present invention is with unique scientific formula to SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethene heat
Plastic copolymer), dispersant carried out the preparation of science, the molecular weight and particle diameter of control SBR (butadiene-styrene rubber) reduce combination
The viscosity of thing, improves dispersiveness of the binding agent in active material, controls SIS (styrene-isoprene-phenylethene thermoplasticity
Copolymer) hardness, the adhesiveness of slurry that active material and binding agent be mixed and Copper Foil can be greatly improved.Control poly- second
The molecular weight and hydroxyl value of glycol, make SBR and SIS be homogeneously dispersed in water, adjust the pH value of adhesive composition, improve activity
Slurry and the adhesion strength and uniformity of Copper Foil that material is mixed with binding agent.
Using binding agent of the present invention, being greatly reduced for addition of the binding agent in negative electrode active material is successfully realized.
So as to significantly increase the service life of battery.Reduce production cost.
The application example of technical solution of the present invention described in detail above, they are only given as an example, are not intended as to this
The application limitation of invention.The equivalent of all operating conditions, is within the scope of the present invention.
Claims (6)
1. a kind of high power lithium ion cell negative electrode binder composition, it is characterised in that comprising following component (weight percent
Than)：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, combination
Thing viscosity is 5.0-50.0mPa.s.
2. high power lithium ion cell negative electrode binder composition according to claim 1, it is characterised in that its component has
There is following percentage by weight：SBR (butadiene-styrene rubber) 15.0%~19.0%, SIS (styrene-isoprene-phenylethene thermoplastics
Property copolymer) 15.0%~19.0%, dispersant 1.5%~3.0%, deionized water 57.0%~63.0%, composition pH value
It 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, it is characterised in that：It is described
SBR (butadiene-styrene rubber) molecular weight be 100000~200000, and butadiene-styrene rubber particle diameter be less than 0.1 μm.
4. high power lithium ion cell negative electrode binder composition according to claim 1 and 2, it is characterised in that：It is described
SIS (styrene-isoprene-phenylethene thermoplastic copolymer) hardness be more than 30.
5. high power lithium ion cell negative electrode binder composition according to claim 1 and 2, it is characterised in that：It is described
Dispersant be 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 characterised in that：First will
Deionized water is added in dispersion pot, and stirring is lower to add SBR (butadiene-styrene rubber), SIS (styrene-isoprene-phenylethene thermoplasticity
Copolymer), dispersant, be heated to 80 DEG C, constant temperature is stirred 5 hours, it is completely dissolved uniformly, is cooled to room temperature, filtering, is gone out
Material.
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| DE19916043A1 (en) * | 1999-04-09 | 2000-10-19 | Basf Ag | Composite body suitable for use as a lithium ion battery |
| JP4819342B2 (en) * | 2004-11-08 | 2011-11-24 | エレクセル株式会社 | Positive electrode for lithium battery and lithium battery using the same |
| WO2006085467A1 (en) * | 2005-02-08 | 2006-08-17 | Mitsubishi Chemical Corporation | Lithium secondary battery and positive electrode material thereof |
| US9187622B2 (en) * | 2012-02-09 | 2015-11-17 | Samsung Sdi Co., Ltd. | Composite binder for battery, and anode and battery including the composite binder |
| CN105122516B (en) * | 2013-02-28 | 2017-03-29 | 日产自动车株式会社 | Positive active material, positive electrode, positive pole and rechargeable nonaqueous electrolytic 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. |