CN104600320A - Functional copper foil based on graphene and preparation method thereof - Google Patents
Functional copper foil based on graphene and preparation method thereof Download PDFInfo
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- CN104600320A CN104600320A CN201310521497.7A CN201310521497A CN104600320A CN 104600320 A CN104600320 A CN 104600320A CN 201310521497 A CN201310521497 A CN 201310521497A CN 104600320 A CN104600320 A CN 104600320A
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- copper foil
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
-
- 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 invention discloses a functional copper foil based on graphene and a preparation method thereof. The functional copper foil based on graphene comprises a copper foil and a material coating containing graphene. The functional copper foil with the surface uniformly coated with a graphene mixed material is used to replace a copper foil as a lithium ion battery anode current collector, the lithium storage characteristic of graphene is utilized, the foil exposure phenomenon of the current collector in the process of coating the battery material is eliminated, the safety accident incidence during usage of a lithium ion battery is reduced, the integral safety of the lithium ion battery is improved, and the electric conductivity and the heat radiation performance of a lithium ion battery electrode are improved. The provided functional copper foil based on graphene eliminates the foil exposure probability during electrode preparation, and improves the integral safety of the battery. Also, the preparation method of the functional copper foil based on graphene is simple, and easy for realizing industrialization and continuous production.
Description
Technical field
The present invention relates to field of lithium ion battery, particularly relate to a kind of function Copper Foil based on Graphene and preparation method thereof.
Background technology
Lithium ion battery as the high performance secondary green battery of one, there is high voltage, high-energy-density, low self-discharge rate, serviceability temperature wide ranges, have extended cycle life, environmental protection, memory-less effect and can the advantage such as high current charge-discharge.In recent years, after lithium ion battery applications field progressively extends to the new opplication fields such as new-energy automobile, electric tool, energy storage from the digital product such as mobile phone, digital camera, require stricter to performance of lithium ion battery, for the application needs making lithium ion battery can meet frontier, the defect that must exist lithium ion battery or deficiency are improved.
Lithium ion battery comprises at least one group of positive pole and negative pole, is connected between described positive pole and negative pole by barrier film.The manufacture craft of the electrode composite material of positive and negative electrode is wherein: to be coated in by electrode material on collector tinsel and the acquisition that is shaped by adhesive.At present, lithium ion battery need to improve in internal resistance, battery heat radiation, fail safe, cycle life, high rate performance, cost etc., and particularly after lithium ion battery is expanded to new-energy automobile application, fail safe seems particularly important.Conventional lithium ion electrode preparation method is directly coated on matrix (aluminium foil, Copper Foil etc.) after being mixed by raw material, obtains li-ion electrode after drying.Traditional lithium ion cell electrode often there will be dew paper tinsel phenomenon in preparation process, if dew Copper Foil phenomenon appears in negative pole, can cause phenomenon such as battery drum shell, short circuit etc., and then the possibility that there will be blast, catch fire.
Summary of the invention
The technical problem that the present invention mainly solves will can be used as Graphene composite material that negative material uses and evenly be coated in copper foil surface and make function Copper Foil containing high conductivity, and replace Copper Foil to prepare lithium ion cell electrode as lithium ion battery negative collector, eliminate the dew paper tinsel phenomenon of collector in coating battery material process, reduce lithium ion battery and in use occur security incident probability, the lithium ion battery overall security improved, and improve conductivity and the heat dispersion of lithium ion cell electrode.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: replace Copper Foil as lithium ion battery negative collector with the function Copper Foil of surface uniform coating graphene-containing composite material, utilize the storage lithium characteristic of Graphene, eliminate the dew paper tinsel phenomenon of collector in coating battery material process, reduce lithium ion battery and in use occur security incident possibility, the lithium ion battery overall security improved, and improve conductivity and the heat dispersion of lithium ion cell electrode.Function Copper Foil based on Graphene provided by the invention can eliminate in electrode production process the possibility revealing paper tinsel, improves the overall security of battery, and its preparation method is simple, is easy to realize industrialization and continuous prodution.
A kind of function Copper Foil based on Graphene is provided, it is characterized in that: described function Copper Foil comprises the material coating of Copper Foil matrix and graphene-containing.
The preparation method of described function Copper Foil, the steps include:
(1) by Graphene, additive, binding agent be (10 ~ 90) in mass ratio: (2 ~ 30): (3 ~ 50) weighing, is then dispersed in dispersant by homogenize material;
(2) slurry homodisperse in step (1) is evenly coated in oven dry at a certain temperature on Copper Foil and obtains function Copper Foil.
In a preferred embodiment of the present invention, described binding agent can be one or more in the polymer on polyvinylidene fluoride (pvdf), polyvinyl butyral resin (PVB), polyoxyethylene, polymethyl acrylate, polyvinylpyrrolidone (PVP), butadiene-styrene rubber, sodium carboxymethylcellulose, LA aqueous adhesive or acrylate basis.
In a preferred embodiment of the present invention, described additive comprises graphite-like (as: KS-6, SO etc., comprise graphite that is natural, Prof. Du Yucang or modification), one or more in carbon fiber, Graphene, hard carbon, carbon nano-tube, conductive black (as: acetylene black, Ketjen black etc.), carbonaceous mesophase spherules, soft carbon, nitride, silica-base material, lithium titanate.
In a preferred embodiment of the present invention, described dispersant comprise in deionized water, ethanol, acetone, isopropyl alcohol, 1-METHYLPYRROLIDONE one or more.
In a preferred embodiment of the present invention, described drying condition is toast 20min ~ 8h at not higher than the temperature of 160 DEG C.
In a preferred embodiment of the present invention, described step (1) dispersion temperature is not higher than 95 DEG C, and jitter time is at 0.5h ~ 10h.
In a preferred embodiment of the present invention, described step (2) coating method is spraying, blade coating or roller coat, and material coating thickness is less than 300 μm.
The invention has the beneficial effects as follows: the function Copper Foil prepared by the present invention eliminates the dew paper tinsel phenomenon that collector occurs in coating battery material process, reduce lithium ion battery and in use occur security incident possibility, the lithium ion battery overall security improved, and improve conductivity and the heat dispersion of lithium ion cell electrode, and its preparation method is simple, is easy to realize industrialization and continuous prodution.
Accompanying drawing explanation
Fig. 1 is the structural representation of the function Copper Foil in the embodiment of the present invention; Wherein 1 is Copper Foil, and 2 is the coating of graphene-containing.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Embodiment one:
(1) be 80:10:10 weighing by Graphene, conductive black, pvdf according to weight ratio, 30 DEG C in NMP, disperse 4h after for subsequent use;
(2) by slurry blade coating scattered to (1) at copper foil surface, 90 DEG C of oven dry.
Embodiment two:
(1) be 70:10:10:10 weighing by Graphene, carbon nano-tube, conductive black, pvdf according to weight ratio, 50 DEG C in NMP, disperse 2h after for subsequent use;
(2) by slurry blade coating scattered to (1) at copper foil surface, 100 DEG C of oven dry.
Embodiment three:
(1) be 70:10:10:10 weighing by Graphene, carbon nano-tube, conductive black, pvdf according to weight ratio, 40 DEG C in NMP, disperse 5h after for subsequent use;
(2) by slurry roller coat scattered to (1) at copper foil surface, 100 DEG C of oven dry.
Embodiment four:
(1) be 43:6:6:18:17 weighing by Graphene, carbon nano-tube, conductive black, butadiene-styrene rubber, sodium carboxymethylcellulose according to weight ratio, 50 DEG C disperse 4h in deionized water after for subsequent use;
(2) by slurry blade coating scattered to (1) at copper foil surface, 105 DEG C of oven dry.
Embodiment five:
(1) be 70:10:10:10 weighing by Graphene, carbon nano-tube, conductive black, pvdf according to weight ratio, 50 DEG C in NMP, disperse 2h after for subsequent use;
(2) by slurry blade coating scattered to (1) at copper foil surface, 100 DEG C dry after; Be coated with at the function copper foil surface prepared cathode size that carbonaceous mesophase spherules is active material and test electrical property.
Embodiment six:
(1) be 80:10:10 weighing by Graphene, acetylene black, pvdf according to weight ratio, 30 DEG C in NMP, disperse 6h after for subsequent use;
(2) pulp spraying scattered to (1) is coated in copper foil surface, 90 DEG C of oven dry.
Embodiment seven:
(1) be 80:10:10 weighing by Graphene, acetylene black, PVB according to weight ratio, 30 DEG C in NMP, disperse 6h after for subsequent use;
(2) pulp spraying scattered to (1) is coated in copper foil surface, 90 DEG C of oven dry.
Embodiment eight:
(1) be 80:5:5:10 weighing by Graphene, acetylene black, KS-6, pvdf according to weight ratio, 30 DEG C in NMP, disperse 4h after for subsequent use;
(2) by slurry blade coating scattered to (1) at copper foil surface, 90 DEG C of oven dry.
Data test
The function Copper Foil of each embodiment is done sample electrode and make half-cell test electrical property, the test data of gained sample sees the following form.
The beneficial effect of lithium ion cell electrode of the present invention is: the function Copper Foil prepared by the present invention eliminates the dew paper tinsel phenomenon that collector occurs in coating battery material process, reduce the probability that security incident in use appears in lithium ion battery, the lithium ion battery overall security improved, and improve conductivity and the heat dispersion of lithium ion cell electrode, and its preparation method is simple, is easy to realize industrialization and continuous prodution.
Function Copper Foil based on Graphene of the present invention and preparation method thereof extends the mode of thinking improving lithium ion battery security, improve electrode interior structure, improve battery security, improve electronics and ion transmission performance etc., can large-scale production be realized, have certain impetus to the development of lithium ion battery and application thereof.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. based on a function Copper Foil for Graphene, it is characterized in that: described function Copper Foil comprises the material coating of Copper Foil matrix and graphene-containing.
2. the preparation method of function Copper Foil according to claim 1, the steps include:
(1) by Graphene, additive, binding agent be (10 ~ 90) in mass ratio: (2 ~ 30): (3 ~ 50) weighing, is then dispersed in dispersant by homogenize material;
(2) slurry homodisperse in step (1) is evenly coated in oven dry at a certain temperature on Copper Foil and obtains function Copper Foil.
3. preparation method according to claim 2, is characterized in that: described binding agent can be one or more in the polymer on polyvinylidene fluoride (pvdf), polyvinyl butyral resin (PVB), polyoxyethylene, polymethyl acrylate, polyvinylpyrrolidone (PVP), butadiene-styrene rubber, sodium carboxymethylcellulose, LA aqueous adhesive or acrylate basis.
4. preparation method according to claim 2, it is characterized in that: described additive comprises graphite-like (as: KS-6, SO etc., comprise graphite that is natural, Prof. Du Yucang or modification), one or more in carbon fiber, Graphene, hard carbon, carbon nano-tube, conductive black (as: acetylene black, Ketjen black etc.), carbonaceous mesophase spherules, soft carbon, nitride, silica-base material, lithium titanate.
5. preparation method according to claim 2, is characterized in that: described dispersant comprise in deionized water, ethanol, acetone, isopropyl alcohol, 1-METHYLPYRROLIDONE one or more.
6. preparation method according to claim 2, is characterized in that: described drying condition is toast 20min ~ 8h at not higher than the temperature of 160 DEG C.
7. preparation method according to claim 2, is characterized in that: described step (1) dispersion temperature is not higher than 95 DEG C, and jitter time is at 0.5h ~ 10h.
8. preparation method according to claim 2, is characterized in that: described step (2) coating method is spraying, blade coating or roller coat, and material coating thickness is less than 300 μm.
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| CN201310521497.7A CN104600320A (en) | 2013-10-30 | 2013-10-30 | Functional copper foil based on graphene and preparation method thereof |
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Cited By (36)
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| CN105086659A (en) * | 2015-08-12 | 2015-11-25 | 嘉兴中易碳素科技有限公司 | Preparation method of high-thermal-conductivity nano carbon copper foil |
| CN105406083A (en) * | 2015-12-17 | 2016-03-16 | 湖南高远电池有限公司 | Quickly-chargeable/dischargeable lithium ion battery and manufacture method thereof |
| CN105762366A (en) * | 2016-05-04 | 2016-07-13 | 江苏深苏电子科技有限公司 | Composite current collector of lithium ion battery and manufacturing method of composite current collector |
| CN105845942A (en) * | 2016-06-20 | 2016-08-10 | 山东建筑大学 | Preparation method of nano graphene copper foil |
| CN105895193A (en) * | 2016-06-05 | 2016-08-24 | 李科 | Silver conductive coating material of lithium ion battery, preparation method of silver conductive coating material and lithium ion battery |
| CN105958006A (en) * | 2016-07-20 | 2016-09-21 | 孙健春 | Lithium battery electrode with cooling function, manufacturing method and lithium battery |
| CN106025289A (en) * | 2016-05-31 | 2016-10-12 | 宁波墨西科技有限公司 | Preparation method of graphene current collector |
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| CN106269445A (en) * | 2016-08-19 | 2017-01-04 | 苏州思创源博电子科技有限公司 | A kind of preparation method of low cost Graphene conducting strip |
| CN106374111A (en) * | 2015-07-20 | 2017-02-01 | 北京中科云腾科技有限公司 | Graphene composite metal film and preparation method thereof |
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