CN105742641A - Conductive coating and lithium-ion battery employing same - Google Patents
Conductive coating and lithium-ion battery employing same Download PDFInfo
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- CN105742641A CN105742641A CN201610176062.7A CN201610176062A CN105742641A CN 105742641 A CN105742641 A CN 105742641A CN 201610176062 A CN201610176062 A CN 201610176062A CN 105742641 A CN105742641 A CN 105742641A
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
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- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
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- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- 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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- 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
- H01M4/623—Binders being polymers fluorinated polymers
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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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- H—ELECTRICITY
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- H01M4/64—Carriers or collectors
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- H—ELECTRICITY
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- 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
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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
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
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- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
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- 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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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides a conductive coating, and belongs to the technical field of lithium-ion batteries. The conductive coating is prepared from the following raw materials in percentage by mass: 1%-70% of a conductive agent, 1%-60% of a binder, 5%-95% of a solvent, 0.1%-10% of a dispersing agent and 0.1%-8% of an adhesion promoter. The invention further provides the lithium-ion battery employing the conductive coating and a preparation method of the conductive coating. The conductive coating provided by the invention has good conductivity and can achieve the targets of improving the battery rate and reducing the internal resistance and the discharge temperature rise; the problem that the material falls off after a pole piece circulates is solved; and meanwhile, the conductive coating is very good in stability and can meet the mass production requirement.
Description
Technical field
The present invention relates to technical field of lithium ion, specifically a kind of electrically-conducting paint and apply the lithium ion battery of this electrically-conducting paint.
Background technology
Along with the popularization of electric automobile, especially Li-ion battery for HEV and start and stop lithium ion battery are higher to the internal resistance of battery core, multiplying power and temperature increase requirement.Lithium ion battery in the market generally adopts the method adjusting positive and negative formula, improves battery rate charge-discharge performance, reduces the internal resistance of cell and temperature rise simultaneously, but the method that formula adjustment improves has certain limitation.
Additionally, existing lithium-ion-power cell there is problems: (1) both positive and negative polarity active substance all uses nano-particle, but the surface of nano-particle and collector can be all of a relatively high, bonding relative difficult between the two, the cementability causing active substance and collector is poor, and contact resistance increases；(2) active substance conventional on current driving force is in addition to the graphite, it is metal oxide materials mostly, its electric conductivity is poor, although prior art is to its process having carried out improving electric conductivity, such as LiFePO4 is carried out carbon cladding and processes the electronic conductivity improving material, but this can only improve the charge-discharge performance of battery core to a certain extent, it still cannot realize the discharge and recharge under larger current, and then limits portion of material range of application on electrokinetic cell；(3) Capacity Ratio of electrokinetic cell is higher, and generally all at more than 20Ah, battery volume is relatively larger, and this has resulted in battery, and to release heat in charge and discharge process relatively more, and especially in high power charging-discharging process, liberated heat is more；It addition, can by multiple batteries by connection in series-parallel composition battery bag when actually used, the spacing between each battery in battery bag is less, is more unfavorable for that heat sheds, when heat is assembled more, it is easy to the danger such as overheated, short-circuit, the burning of battery occur.
Adhesive property in order to improve the existence of current lithium-ion-power cell is poor, provide high rate charge-discharge, the problem reducing the internal resistance of cell and temperature rise, the mode being coated with conductive coating on a current collector can be adopted, positive pole of the prior art uses the mode of utter misery aluminium foil, but this patent pertains only to plus plate current-collecting body and uses utter misery aluminium foil, namely on plus plate current-collecting body aluminium foil surface, it is coated with conductive black, coating layer thickness is 0.5-3um, does not provide the preparation of electrically-conducting paint and applicable application method.
Existing electrically-conducting paint there is problems in that the bad dispersibility of (1) existing electrically-conducting paint, need to use ball mill dispersion to be opened by the aggregate of its molecule, to facilitate subsequent coated, but ball-milling technology energy consumption when producing in enormous quantities is higher, in mechanical milling process, caloric value is big simultaneously, it is easy to problem blast on fire occur；(2) stability of existing electrocondution slurry is poor, and the electrocondution slurry prepared generally deposits the 24h problem arising that slurry settles, and is suitable only for laboratory research or small lot experiment uses, it is impossible to be applied to large-scale production；(3) binder swells of existing electrocondution slurry is relatively larger, the polyvinyl alcohol used in prior art, due to the swelling checking of binding agent, thus easily there is peeling in conductive coating position after battery charging and discharging expands, causes cycle performance to be deteriorated.
Summary of the invention
In view of this, it is desirable to provide a kind of electrically-conducting paint, not only there is good electric conductivity, it is possible to reach to improve battery multiplying power, reduce internal resistance and the purpose of electric discharge temperature rise, and improve the problem dropped off after pole piece circulates；The stability of electrically-conducting paint is also very good simultaneously, it is possible to meet large-scale production requirement.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that: a kind of electrically-conducting paint, comprise the raw material of following mass percent:
Further, the raw material of following mass percent is comprised:
Further, also include the first stabilizer, described first stabilizer be in gamma-butyrolacton, trioctyl phosphate, polyvinylpyrrolidone one or several with arbitrary proportion mixing use, described first stabilizer can help electrically-conducting paint to reach steady statue.
Further, also include the second stabilizer and pH adjusting agent, described second stabilizer be in alkali swollen thickener, associativity alkali swollen thickener, hydrophobically-modified alkali swelling type thickening agent one or several with arbitrary proportion mixing use, described second stabilizer and pH value regulator can help electrically-conducting paint to reach steady statue.
Further, described conductive agent be in acetylene black, white carbon black, superconduction white carbon black, CNT, conductive carbon fibre, Graphene, electrically conductive graphite one or several with arbitrary proportion mixing use.
Further, described binding agent be in amino resins, modified polyacrylate, fluoro acrylic ester, acrylate copolymer, acrylonitrile polymer, polyurethane, Polystyrene-acrylate, polyvinyl butyral resin, resorcinol formaldehyde resin one or several with arbitrary proportion mixing use.
Further, described solvent be deionized water, N-Methyl pyrrolidone or both with arbitrary proportion mixing use.
Further, described dispersant be in methanol, ethanol, propanol, n-butyl alcohol, isopropanol, ethylene glycol, oxolane, dimethoxy-ethane, propylene glycol, glycerol, acetone, butanone, toluene, acetonitrile one or several with arbitrary proportion mixing use.
Further, described adhesion promoter is that aldehyde ketone resin, epoxy resin, click are frustrated, one or several in styrene-butadiene rubber, NBR, neoprene use with arbitrary proportion mixing.
Further, described pH value regulator be in ammonia, hydroxide, carbonate, HF, HNO3, H3PO4, phosphate, nitrate one or several with arbitrary proportion mixing use.
Present invention also offers the lithium ion battery applying above-mentioned electrically-conducting paint.
The preparation method that present invention also offers above-mentioned lithium ion battery, comprises the steps:
(1) after each raw material components blender mix homogeneously weighed, electrically-conducting paint is obtained, use the mode of micro-intaglio printing, it is coated with the electrically-conducting paint of dirac cone-shaped on a current collector, the coating thickness of electrically-conducting paint is 0.5～2.0um, obtains the collector with dirac cone-shaped electrically-conducting paint after drying；
(2) by active substance, the conductive agent of 1%～20%, the Kynoar of 3%～10% and appropriate N-Methyl pyrrolidone mix homogeneously that mass percent is 75%～95%, slurry is obtained after mix homogeneously, this slurry is coated on the collector with dirac cone-shaped electrically-conducting paint, after drying, obtains the porous electrode with dirac cone-shaped electrically-conducting paint；
(3) this porous electrode is carried out film-making, assembling, be fabricated to the lithium ion battery with dirac cone-shaped electrically-conducting paint.
Further, in described step (1), slurry uses the mode of roller coat or spraying to be coated on the collector of the electrically-conducting paint with dirac cone-shaped.
Further, in described step (2), the viscosity of slurry is 1000mPa*s～7000mPa*s.
Further, in described step (2), the viscosity of slurry is 3000mPa*s～6000mPa*s.
Relative to prior art, present invention have the advantage that
(1) dispersibility of existing electrically-conducting paint is poor, great majority all need to use ball-milling technology, electrically-conducting paint additionally exists substantial amounts of organic solvent, burning, blast easily occur under long ball milling, when producing in enormous quantities, the dangerous probability of ball-milling technology increases, and this also promotes for the batch production of existing electrically-conducting paint and adds difficulty；And electrically-conducting paint good dispersion provided by the invention, it is only necessary to common dispersing apparatus can complete, it is not necessary to again buying dispersing apparatus can use to manufacturer, alleviates the burden of producer.
(2) stability of existing electrically-conducting paint is poor, and coating arises that sedimentation after depositing 12h, and is unfavorable for use of large-scale production；And electrically-conducting paint good stability provided by the invention, it is possible to stably deposit more than 7 days, be fully able to the memory requirement of coating when meeting large-scale production.
(3) binder swells of existing electrically-conducting paint is relatively larger, the polyvinyl alcohol used in existing electrically-conducting paint, due to the swelling action of binding agent, make porous electrode charge and discharge cycles easily in conductive coating position, peeling occur after expanding, cause cycle performance to be deteriorated；And the binder swells of electrically-conducting paint provided by the invention is smaller, cementability is relatively good, cycle performance of battery will be caused to decline because of swelling.
(4) lithium ion battery in the market generally adopts the method adjusting positive and negative formula, can reach to a certain extent battery multiplying power to be provided, reduces the purpose of internal resistance and temperature rise, but formula adjustment has certain limitation, such as conductive agent makes the increase of consumption can improve the multiplying power of battery, after but conductive agent makes consumption increase, the cementability of pole piece can be deteriorated, in order to improve bonding must improve again binding agent make consumption, the active substance addition that so can make battery reduces more, so that the decrease in density of battery core energy is too much.Prior art use utter misery aluminium foil battery high rate performance is promoted improvement also limited；The present invention can make up the limitation of formula adjustment, can when not adjusting formula or when formula is finely tuned, the problem solving battery multiplying power, internal resistance and temperature rise；Adopt the electrically-conducting paint of dirac cone-shaped can better promote battery high rate performance than common utter misery aluminium foil simultaneously.
(5) electrically-conducting paint in the present invention uses the mode of micro-intaglio printing that electrically-conducting paint is applied as the mode of dirac cone-shaped, can be applied not only to plus plate current-collecting body, it is also possible to be applied to negative current collector, for instance silicon-carbon cathode, lithium titanate anode etc..
Detailed description of the invention
Below in conjunction with embodiment and comparative example, the present invention will be described.
Embodiment 1
In the present embodiment, stabilizer DSXA1130 is from Shenzhen Hai Chuan chemical industry.
(1) by 1kg white carbon black, 2kg acrylonitrile polymer, 8kg deionized water, 0.3kg ethanol, 0.1kgDSXA1130, 0.1kg aldehyde ketone resin double planetary mixer mixes, 1h is stirred with the speed of 3500r/min, then in mixture, it is slowly added to the pH value regulator LiOH solution that mass fraction pre-configured for 150g is 0.5% while stirring, 15min it is stirred for after being added completely into, regulate pH to 7, obtain the electrically-conducting paint that viscosity is 1000mpa*s, the electrically-conducting paint prepared is used the mode of micro-intaglio printing, the shape of dirac cone it is applied as at aluminium foil surface, baking is dry, obtain the collector with dirac cone-shaped electrically-conducting paint thick with 1.0um；
(2) it is ternary material by mass ratio: superconduction white carbon black: the raw material mixing of Kynoar=91:4:5, add N-Methyl pyrrolidone, 2h is stirred with the speed of 2000r/min, obtain the slurry that viscosity is 4600mPa*s that is uniformly dispersed, this slurry is coated on the aluminium foil with dirac cone-shaped electrically-conducting paint, after drying, obtains the porous electrode with dirac cone-shaped electrically-conducting paint；
(3) this porous electrode is carried out film-making, assembling, be fabricated to the lithium ion battery with dirac cone-shaped electrically-conducting paint.
Embodiment 2
In the present embodiment conductive agent CNT from sky how LB-100, solids content is 5wt%.
(1) by 2kg CNT, 0.5kg acetylene black, 2.5kg Polystyrene-acrylate, 5kgN-methyl pyrrolidone, 0.4kg polyvinylpyrrolidone, 0.2kg gamma-butyrolacton, 0.1kg click is frustrated and is mixed with double planetary mixer, 3h is stirred with the speed of 5000r/min, add the N-Methyl pyrrolidone of 8kg afterwards, 1h is stirred with the speed of 5000r/min, obtain the electrically-conducting paint that viscosity is 1600mpa*s, the mode that the electrically-conducting paint prepared uses micro-intaglio printing is applied as the shape of dirac cone at aluminium foil surface, baking is dry, obtain the collector of the dirac cone-shaped electrically-conducting paint thick with 2.0um；
(2) it is LiFePO4 by mass ratio: superconduction white carbon black: the raw material mixing of Kynoar=92:3:5, add N-Methyl pyrrolidone, 3h is stirred with the speed of 4000r/min, obtain the slurry that viscosity is 6000mPa*s that is uniformly dispersed, this slurry is coated on the aluminium foil with dirac cone-shaped conductive coating, dries the porous electrode obtained with dirac cone-shaped electrically-conducting paint；
(3) this porous electrode is carried out film-making, assembling, be fabricated to the lithium ion battery with dirac cone-shaped electrically-conducting paint.
Embodiment 3
In the present embodiment, superconduction white carbon black is Ketjen black ECP600JD.
(1) by 0.3kg conductive carbon fibre, 0.2kg superconduction white carbon black, 2kg silicone-modified polyacrylate, 10kg deionized water, 0.8kg isopropanol, 0.5kg double planetary mixer mixing used for epoxy resin, 4h is stirred with the speed of 5000r/min, obtain the electrically-conducting paint that viscosity is 1200mpa*s, the mode that the electrically-conducting paint prepared uses micro-intaglio printing is applied as the shape of dirac cone at aluminium foil surface, baking is dry, irradiate 30s then through Burdick lamp, obtain the collector of the dirac cone-shaped electrically-conducting paint thick with 0.5um；
(2) it is lithium titanate by mass ratio: superconduction white carbon black: the raw material mixing of Kynoar=89:5:6, add N-Methyl pyrrolidone, 4h is stirred with the speed of 3800r/min, obtain the slurry that viscosity is 6300mPa*s that is uniformly dispersed, this slurry is coated on the aluminium foil with dirac cone-shaped conductive coating, dries the porous electrode obtained with dirac cone-shaped electrically-conducting paint；
(3) this porous electrode is carried out film-making, assembling, be fabricated to the lithium ion battery with dirac cone-shaped electrically-conducting paint.
Embodiment 4
(1) by 1kg Graphene, 3kg electrically conductive graphite, 2kg polyurethane, 12kg deionized water, 1.5kg n-butyl alcohol, 0.6kg trioctyl phosphate, 0.8kg NBR double planetary mixer mix, 3h is stirred with the speed of 4000r/min, obtain the electrically-conducting paint that viscosity is 1400mpa*s, the mode that the electrically-conducting paint prepared uses micro-intaglio printing is applied as the shape of dirac cone at aluminium foil surface, baking is dry, obtains the collector of the dirac cone-shaped electrically-conducting paint thick with 0.9um；
(2) it is lithium titanate by mass ratio: superconduction white carbon black: the raw material mixing of Kynoar=90:5:5, add N-Methyl pyrrolidone, 3h is stirred with the speed of 3500r/min, obtain the slurry that viscosity is 5300mPa*s that is uniformly dispersed, this slurry is coated on the aluminium foil with dirac cone-shaped conductive coating, dries the porous electrode obtained with dirac cone-shaped electrically-conducting paint；
(3) this porous electrode is carried out film-making, assembling, be fabricated to the lithium ion battery with dirac cone-shaped electrically-conducting paint.
Embodiment 5
(1) by 2kg white carbon black, 2kg CNT, 2kg conductive carbon fibre, 2kg acrylonitrile polymer, 6kg deionized water, 5kgN-methyl pyrrolidone, 0.3kg toluene, 0.2kg acetonitrile, 0.5kg neoprene double planetary mixer mix, 2h is stirred with the speed of 4500r/min, obtain the electrically-conducting paint that viscosity is 1800mpa*s, the mode that the electrically-conducting paint prepared uses micro-intaglio printing is applied as the shape of dirac cone at aluminium foil surface, baking is dry, obtains the collector of the dirac cone-shaped electrically-conducting paint thick with 1.5um；
(2) it is ternary material by mass ratio: superconduction white carbon black: the raw material mixing of Kynoar=85:10:5, add N-Methyl pyrrolidone, 3h is stirred with the speed of 2500r/min, obtain the slurry that viscosity is 5200mPa*s that is uniformly dispersed, this slurry is coated on the aluminium foil with dirac cone-shaped electrically-conducting paint, after drying, obtains the porous electrode with dirac cone-shaped electrically-conducting paint；
(3) this porous electrode is carried out film-making, assembling, be fabricated to the lithium ion battery with dirac cone-shaped electrically-conducting paint.
Comparative example 1
It is LiFePO4 by the ratio in embodiment 2: superconduction white carbon black: form slurry prepared by the raw material of Kynoar=92:3:5, is applied directly on the aluminium foil of 20um, dry and obtain porous electrode, then by its film-making, assembling, obtain lithium ion battery.
Comparative example 2
Preparing ratio according to method in embodiment 2 is LiFePO4: superconduction white carbon black: form slurry prepared by the raw material of Kynoar=85:6:9, is applied directly on the aluminium foil of 20um, dries and obtains porous electrode, then by its film-making, assembling, obtains lithium ion battery.
Comparative example 3
Adopt and prior art uses polyvinyl alcohol prepare electrically-conducting paint as binding agent.
First mixing quality percentage ratio be 4.5% Celvol165 polyvinyl alcohol and 95.5% water, then under agitation heat the mixture to 91 DEG C, until obtaining clear liquid, stand-by.By in ball mill with the VulcanXC72R white carbon black that ceramic bead Grinding Quality percentage ratio is 4.2%, the isopropanol of 27.88%, the water of 5.70% and 62.22% the aqueous solution of Celvol165 polyvinyl alcohol, prepare electrically-conducting paint, coating uses the mode of intaglio printing be coated on aluminium foil afterwards, and coating thickness is 1um.
It is LiFePO4 by the mass ratio in embodiment 2: superconduction white carbon black: form slurry prepared by the raw material of Kynoar=92:3:5, is coated on the 20um aluminium foil with conductive coating, dry and obtain porous electrode, then by its film-making, assembling, obtain lithium ion battery.
Contrast test one
Testing example 2, comparative example 1, comparative example 2 and the efficiency first of lithium ion battery of comparative example 3, internal resistance and electric discharge temperature rise respectively, result of the test is in Table 1.
The efficiency first of table 1 lithium ion battery, internal resistance and electric discharge temperature rise contrast test
Contrast test two
Testing example 1-embodiment 5 and the stability of the electrically-conducting paint of comparative example 3, observe the sedimentation situation of coating, result of the test part table 2 every day respectively.
Table 2 electrically-conducting paint stability contrast test
| Test group | There is the sedimentation time in slurry |
| Embodiment 1 | > 7 days |
| Embodiment 2 | > 7 days |
| Embodiment 3 | > 7 days |
| Embodiment 4 | > 7 days |
| Embodiment 5 | > 7 days |
| Comparative example 3 | 12-24h |
By data in table 1, table 2 it can be seen that electrically-conducting paint provided by the invention not only has good electric conductivity, it is possible to reach to improve battery multiplying power, reduce internal resistance and the purpose of electric discharge temperature rise, and improve the problem dropped off after pole piece circulates；The stability of electrically-conducting paint is also very good simultaneously, it is possible to meet large-scale production requirement.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. an electrically-conducting paint, it is characterised in that: comprise the raw material of following mass percent:
Preferably,
2. electrically-conducting paint according to claim 1, it is characterised in that: also include the first stabilizer, described first stabilizer be in gamma-butyrolacton, trioctyl phosphate, polyvinylpyrrolidone one or several with arbitrary proportion mixing use.
3. electrically-conducting paint according to claim 1, it is characterized in that: also include the second stabilizer and pH adjusting agent, described second stabilizer be in alkali swollen thickener, associativity alkali swollen thickener, hydrophobically-modified alkali swelling type thickening agent one or several with arbitrary proportion mixing use.
4. electrically-conducting paint according to claim 1, it is characterised in that: described conductive agent be in acetylene black, white carbon black, superconduction white carbon black, CNT, conductive carbon fibre, Graphene, electrically conductive graphite one or several with arbitrary proportion mixing use.
5. electrically-conducting paint according to claim 1, it is characterised in that: described binding agent be in amino resins, modified polyacrylate, fluoro acrylic ester, acrylate copolymer, acrylonitrile polymer, polyurethane, Polystyrene-acrylate, polyvinyl butyral resin, resorcinol formaldehyde resin one or several with arbitrary proportion mixing use.
6. electrically-conducting paint according to claim 1, it is characterised in that: described dispersant be in methanol, ethanol, propanol, n-butyl alcohol, isopropanol, ethylene glycol, oxolane, dimethoxy-ethane, propylene glycol, glycerol, acetone, butanone, toluene, acetonitrile one or several with arbitrary proportion mixing use.
7. electrically-conducting paint according to claim 1, it is characterised in that: described solvent be deionized water, N-Methyl pyrrolidone or both with arbitrary proportion mixing use.
8. electrically-conducting paint according to claim 1, it is characterised in that: described adhesion promoter is that aldehyde ketone resin, epoxy resin, click are frustrated, one or several in styrene-butadiene rubber, NBR, neoprene use with arbitrary proportion mixing.
9. the lithium ion battery of the electrically-conducting paint applied as described in any one of claim 1-8.
10. the method preparing lithium ion battery as claimed in claim 9, it is characterised in that: comprise the steps:
(1) after each raw material components blender mix homogeneously weighed, electrically-conducting paint is obtained, use the mode of micro-intaglio printing, it is coated with the electrically-conducting paint of dirac cone-shaped on a current collector, the coating thickness of electrically-conducting paint is 0.5～2.0um, obtains the collector with dirac cone-shaped electrically-conducting paint after drying；
(2) by active substance, the conductive agent of 1%～20%, the Kynoar of 3%～10% and appropriate N-Methyl pyrrolidone mix homogeneously that mass percent is 75%～95%, slurry is obtained after mix homogeneously, this slurry is coated on the collector with dirac cone-shaped electrically-conducting paint, after drying, obtains the porous electrode with dirac cone-shaped electrically-conducting paint；
(3) this porous electrode is carried out film-making, assembling, be fabricated to the lithium ion battery with dirac cone-shaped electrically-conducting paint.
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