CN105261760A - Lithium ion battery waterborne positive electrode composite collector, positive plate, manufacturing methods for lithium ion battery waterborne positive electrode composite collector and positive plate, and lithium ion battery - Google Patents

Lithium ion battery waterborne positive electrode composite collector, positive plate, manufacturing methods for lithium ion battery waterborne positive electrode composite collector and positive plate, and lithium ion battery Download PDF

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CN105261760A
CN105261760A CN201510723952.0A CN201510723952A CN105261760A CN 105261760 A CN105261760 A CN 105261760A CN 201510723952 A CN201510723952 A CN 201510723952A CN 105261760 A CN105261760 A CN 105261760A
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lithium ion
ion battery
positive
positive electrode
composite current
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CN105261760B (en
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王海文
张国军
李亚玲
怀永建
张海峰
白莉
贾海
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China Aviation Lithium Battery Co Ltd
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China Aviation Lithium Battery Co Ltd
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of or comprising active material
    • H01M4/64Carriers or collectors
    • H01M4/66Selection of materials
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/04Construction or manufacture in general
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • H01M10/0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of or comprising active material
    • H01M4/04Processes of manufacture in general
    • H01M4/0402Methods of deposition of the material
    • H01M4/0404Methods of deposition of the material by coating on electrode collectors
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of or comprising active material
    • H01M4/13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of or comprising active material
    • H01M4/64Carriers or collectors
    • H01M4/66Selection of materials
    • H01M4/665Composites
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention relates to a lithium ion battery waterborne positive electrode composite collector, a positive plate, manufacturing methods for the lithium ion battery waterborne positive electrode composite collector and the positive plate, and the lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion battery waterborne positive electrode composite collector is prepared by the following steps of adding a binder into a solvent to uniformly mix to obtain a binder solution, wherein the mass ratio of the binder to the solvent is 1:10-30; adding a conductive agent to the binder solution, uniformly mixing, grinding and emulsifying to obtain a conducive slurry, wherein the mass ratio of the conductive agent to the binder is 1-99:1; and coating the surface of the positive electrode collector with the prepared conductive slurry, and drying to obtain the lithium ion battery waterborne positive electrode composite collector. The problem of low flexibility of the waterborne positive plate is greatly solved by the lithium ion battery waterborne positive electrode composite collector; and meanwhile, the adhesive force of the coating layer is improved, the internal resistance of the battery is reduced, and the high-rate discharge performance and the cycle performance of the battery are improved.

Description

Lithium ion battery aqueous positive-pole composite current collector, positive plate and preparation method thereof, lithium ion battery
Technical field
The present invention relates to a kind of lithium ion battery aqueous positive-pole composite current collector, positive plate and preparation method thereof, lithium ion battery, belong to technical field of lithium ion.
Background technology
The features such as lithium ion battery has that operating voltage is high, energy density is large, have extended cycle life, self discharge is little, memory-less effect, environmental friendliness, have become the ideal source in the fields such as communication, electric tool, motor vehicle, space flight and aviation at present.
The manufacturing process of the pole piece of lithium ion battery first binding agent and active material, conductive agent bond to be mixed with the slurry of appropriate viscosity, then after filtration, be coated with, the operation such as drying makes pole piece.Pole piece is divided into positive plate and negative plate, according to the physicochemical characteristics of binding agent and active material, current based lithium-ion battery positive plate generally adopts fluoropolymer if Kynoar is as binding agent, this fluoropolymer solvent based adhesive in use needs a large amount of organic solvents, as N-methyl pyrrolidone (NMP), dimethyl formamide (DMF), dimethyl sulfoxide (DMSO) (DMSO) etc., because organic solvent easily causes environmental pollution, and operator ' s health is worked the mischief, therefore in coating dry run, need to increase cost input reclaim organic solvent, the price of fluoropolymer solvents type binding agent is relatively high simultaneously, production technology relative complex, the demand of lithium ion battery fast development can not be met.
In order to overcome above-mentioned defect, people have have researched and developed aqueous positive-pole binder system, and be applied to the making of positive plate, the Chinese invention patent being CN1328102A as publication number discloses a kind of water adhesive for electrode material of secondary lithium ion battery, and publication number is that the Chinese invention patent of CN1328104A discloses a kind of process for preparing water adhesive of lithium ion battery.But the aqueous positive-pole sheet pliability adopting above-mentioned aqueous binder to prepare is poor, coating adhesion is low, and the internal resistance of cell is large, and large multiplying power discharging energy is lower, and cycle life is shorter, seriously limits the practical application of the lithium ion battery using aqueous positive-pole sheet.
Application publication number is that the Chinese invention patent application (Shen Qing Publication day is on August 6th, 2014) of CN103972471A discloses positive plate of a kind of large multiplying power ferric phosphate lithium ion battery and preparation method thereof, and specifically disclose a kind of anode pole piece of large multiplying power ferric phosphate lithium ion battery, its collector comprises the conductive layer of aluminium foil and upper printing thereof, and this conductive layer comprises carbon black, Kynoar or carbon black, Kynoar-hexafluoropropylene copolymer.But the pliability of this positive plate is poor, in following process process, pole piece is easily caused to occur crackle.
Summary of the invention
The object of the present invention is to provide one can improve pole piece flexible lithium ion battery aqueous positive-pole composite current collector.The present invention also aims to provide a kind of and use positive plate of above-mentioned composite current collector and preparation method thereof, use the lithium ion battery of this positive plate.
In order to realize above object, the technical scheme of lithium ion battery aqueous positive-pole composite current collector of the present invention is as follows:
A kind of lithium ion battery aqueous positive-pole composite current collector, adopts the preparation method comprised the steps to obtain:
1) binding agent is added in solvent, mix, obtain binder solution; The mass ratio of described binding agent and solvent is 1:10-30;
2) to step 1) in add conductive agent in obtained binder solution, mix, grinding emulsification, obtains electrocondution slurry; The mass ratio of described conductive agent and binding agent is 1-99:1;
3) by step 2) in obtained electrocondution slurry be coated in anode collection surface, dryly form conductive coating, to obtain final product.
Lithium ion battery aqueous positive-pole composite current collector of the present invention adopts said method to obtain, substantially improve the problem that aqueous positive-pole sheet pliability is poor, also improve coating adhesion simultaneously, reduce the internal resistance of cell, improve large multiplying power discharging property and the cycle performance of battery.
Described conductive agent is one or more in SuperP, KS-6, carbon fiber, carbon nano-tube, Graphene.
Described solvent is 1-METHYLPYRROLIDONE or water.
Described plus plate current-collecting body is collector of the prior art, is generally aluminium foil, and the thickness of aluminium foil is 10-25 μm.
Described step 3) in dry temperature depending on step 1) in the solvent kind that uses determine, general, baking temperature is 60-140 DEG C.
In order to improve step 2) middle efficiency of grinding, do not destroy again the granularity uniformity of slurry simultaneously, step 2) in grinding emulsification grinding rate be 800-2000rpm, preferred rotating speed is 1000-1500rpm, grinding emulsification uses ceramic grinding ball, the particle diameter of ball is 0.1-5mm, and preferable particle size is 0.4-1mm.The time of grinding emulsification is advisable so that slurry is ground to viscosity stabilization, general, and grinding emulsification times is not less than 1h.
In order to improve the uniformity of electrocondution slurry, described step 2) in after grinding emulsification, carry out de-bubble, process of sieving.Be specially the slurry after making grinding emulsification to keep at least crossing 200 ~ 300 eye mesh screens after 8h under the vacuum state being not more than-0.08MPa.The solid content of described electrocondution slurry is preferably 10 ~ 30wt%, and viscosity is preferably 20 ~ 500mPas.
Described step 3) in coating conventional coating method can be adopted in prior art to carry out, as intaglio printing mode applies.
The surface density of described conductive coating is 0.1-10g/m 2.
Described step 1) in binding agent be one or more in polyvinylidene fluoride (PVDF), polyvinyl alcohol, polyurethane, sodium carboxymethylcellulose (CMC), butadiene-styrene rubber (SBR), polyacrylate, polyacrylonitrile, polyacrylamide, ethylene-vinyl acetate copolymer emulsion.
The technical scheme of positive plate of the present invention is as follows:
A kind of positive plate, comprise above-mentioned lithium ion battery aqueous positive-pole composite current collector and the positive active material being coated in described lithium ion battery aqueous positive-pole composite current collecting surface, described positive active material is made up of the component of following percentage by weight: positive electrode 90%-98%, conductive agent 0.5%-8%, positive electrode binder 1.5%-8%.
Described positive electrode binder is one or both in polyvinyl alcohol, sodium carboxymethylcellulose (CMC), butadiene-styrene rubber (SBR), polyacrylate, ethylene-vinyl acetate copolymer emulsion, nitrile-acrylamide-acrylic acid lonitrile copolymer, acrylic acid-acrylamide copolymer, acrylic acid-acrylamide-acrylonitrile copolymer.
Described conductive agent is one or more in SuperP, KS-6, carbon fiber, carbon nano-tube, Graphene.
The technical scheme of the preparation method of positive plate of the present invention is as follows:
The preparation method of above-mentioned positive plate, comprises the steps: positive electrode binder and water Homogeneous phase mixing, then adds conductive agent, add positive electrode after mixing, mix to obtain anode sizing agent, anode sizing agent is coated in described lithium ion battery aqueous positive-pole composite current collecting surface, drying, to obtain final product; The mass ratio of described positive electrode binder and water is 1:20-50.
Described anode sizing agent is through toning viscosity, de-bubble, filtration treatment.Be specially and make anode sizing agent keep at least crossing 160 eye mesh screens after 12h under the vacuum state being not more than-0.08MPa.The solid content of described anode sizing agent is 40-70%, and viscosity is 4000-7000mPas.
Describedly be applied to extrusion coated.
The technical scheme of lithium ion battery of the present invention is as follows:
A kind of lithium ion battery, uses above-mentioned positive plate.
Lithium ion battery of the present invention comprises battery container, battery core and electrolyte, and described battery core and electrolyte are sealed in battery container, and described battery core comprises positive pole, negative pole and the barrier film between both positive and negative polarity.
The pole piece pliability that lithium ion battery aqueous positive-pole composite current collector of the present invention obtains is better, adhesive force is also far longer than pole piece of the prior art, reach 14.5-16.4N/m, surface resistance is less than the surface resistance of pole piece of the prior art, is 0.06-0.09 Ω/mm 2, use the lithium ion battery internal resistance of above-mentioned collector less, high rate performance and cycle performance are obtained for and increase substantially.
Accompanying drawing explanation
Fig. 1 is the structural representation of positive plate in the embodiment of the present invention 1;
Fig. 2 is the AC internal Resistance normal distribution of the lithium ion battery in embodiment of the present invention 1-3 and comparative example;
Fig. 3 is the DC internal resistance change curve of the lithium ion battery in embodiment of the present invention 1-3 and comparative example;
Fig. 4 is the multiplying power discharging property curve chart of the lithium ion battery in embodiment of the present invention 1-3 and comparative example;
Fig. 5 is the cyclic curve figure of the lithium ion battery in embodiment of the present invention 1-3 and comparative example.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is further detailed.
Embodiment 1
The lithium ion battery aqueous positive-pole composite current collector of the present embodiment, adopts the preparation method comprised the steps to obtain:
1) 1kg binding agent polyvinylidene fluoride (PVDF) is added in 20kg solvent N-methyl pyrilidone, mix, obtain binder solution;
2) to step 1) in add 9kg conductive agent SuperP in obtained binder solution, mix, adopt the grinding ball of 0.4mm particle diameter with the rotating speed of 1000rpm grinding emulsification 2h, de-bubble process 8h, crosses 200 eye mesh screens, obtains electrocondution slurry;
3) by step 2) in obtained electrocondution slurry adopt intaglio press to be evenly coated in two surfaces of plus plate current-collecting body aluminium foil, the thickness of aluminium foil is 20 μm, and coated side density is 2g/m 2, dry at 120 DEG C, to obtain final product.
As shown in Figure 1, the positive plate of the present embodiment comprises above-mentioned lithium ion battery aqueous positive-pole composite current collector and is coated in the positive active material 3 on described lithium ion battery aqueous positive-pole composite current collector two surfaces, lithium ion battery aqueous positive-pole composite current collector comprises collector aluminium, 1 and be coated in the surperficial conductive coating 2 of two, aluminium foil, positive active material is made up of the component of following percentage by weight: LiFePO4 95%, SuperP2%, nitrile-acrylamide-acrylic acid lonitrile copolymer 2%, sodium carboxymethylcellulose 1%.
The preparation method of above-mentioned positive plate comprises the steps: 42g sodium carboxymethylcellulose to be dissolved in 1500g water, adding 600g nitrile-acrylamide-acrylic acid lonitrile copolymer, after Homogeneous phase mixing, add 126gSuperP, after Homogeneous phase mixing, add 4000g LiFePO4 again, Homogeneous phase mixing, adjusting viscosity is 5000mPas, obtained anode sizing agent after de-bubble is filtered, the solid content of gained anode sizing agent is 50.8%, is adopted by anode sizing agent extrusion coating machine to be evenly coated on above-mentioned lithium ion battery aqueous positive-pole composite current collector, obtains positive plate.
The lithium ion battery of the present embodiment, comprise battery container, battery core and electrolyte, battery core and electrolyte are sealed in battery container, battery core comprises positive pole, negative pole and the barrier film between both positive and negative polarity, wherein just very above-mentioned positive plate, negative pole is graphite cathode of the prior art, and barrier film adopts the double-deck microporous barrier of PP.
The lithium ion battery of the present embodiment adopts lamination to make battery core, and conventionally in method make the soft bag lithium ionic cell of 5Ah.
Embodiment 2
The lithium ion battery aqueous positive-pole composite current collector of the present embodiment, adopts the preparation method comprised the steps to obtain:
1) 200g binding agent sodium carboxymethylcellulose (CMC) is added in 15kg solvent deionized water, mix, then add 1.4kg polyvinyl alcohol, Homogeneous phase mixing, obtain binder solution;
2) to step 1) in add 2.4kg conductive agent SuperP in obtained binder solution, mix, adopt the grinding ball of 0.6mm particle diameter with the rotating speed of 1000rpm grinding emulsification 2h, de-bubble process 8h, crosses 200 eye mesh screens, obtains electrocondution slurry;
3) by step 2) in obtained electrocondution slurry adopt intaglio press to be evenly coated in two surfaces of plus plate current-collecting body aluminium foil, the thickness of aluminium foil is 10 μm, and coated side density is 1g/m 2, dry at 70 DEG C, to obtain final product.
The positive plate of the present embodiment comprises above-mentioned lithium ion battery aqueous positive-pole composite current collector and is coated in the positive active material on described lithium ion battery aqueous positive-pole composite current collector two surfaces, positive active material is made up of the component of following percentage by weight: LiFePO4 95%, SuperP2%, acrylic acid-acrylamide-acrylonitrile copolymer 3%.
The preparation method of above-mentioned positive plate comprises the steps: 2400g acrylic acid-acrylamide-acrylonitrile copolymer to be dissolved in 6000g water, after Homogeneous phase mixing, add 240gSuperP, after Homogeneous phase mixing, add 1140g LiFePO4 again, Homogeneous phase mixing, adjusting viscosity is 5000mPas, obtained anode sizing agent after de-bubble is filtered, the solid content of gained anode sizing agent is 56%, adopted by anode sizing agent extrusion coating machine to be evenly coated on above-mentioned lithium ion battery aqueous positive-pole composite current collector, obtain positive plate.
The lithium ion battery of the present embodiment, comprise battery container, battery core and electrolyte, battery core and electrolyte are sealed in battery container, battery core comprises positive pole, negative pole and the barrier film between both positive and negative polarity, wherein just very above-mentioned positive plate, negative pole is graphite cathode of the prior art, and barrier film adopts the double-deck microporous barrier of PP.
The lithium ion battery of the present embodiment adopts lamination to make battery core, and conventionally in method make the soft bag lithium ionic cell of 5Ah.
Embodiment 3
The lithium ion battery aqueous positive-pole composite current collector of the present embodiment, adopts the preparation method comprised the steps to obtain:
1) added in 15kg solvent deionized water by 200g binding agent sodium carboxymethylcellulose (CMC), mix, then add 1.4kg butadiene-styrene rubber (SBR), Homogeneous phase mixing, obtains binder solution;
2) to step 1) in add the hybrid conductive agent that 800gSuperP and 1600g Graphene mixes in obtained binder solution, mix, adopt the grinding ball of 0.3mm particle diameter with the rotating speed of 1000rpm grinding emulsification 2h, de-bubble process 8h, cross 200 eye mesh screens, obtain electrocondution slurry;
3) by step 2) in obtained electrocondution slurry adopt intaglio press to be evenly coated in two surfaces of plus plate current-collecting body aluminium foil, the thickness of aluminium foil is 25 μm, and coated side density is 1g/m 2, dry at 70 DEG C, to obtain final product.
The positive plate of the present embodiment comprises above-mentioned lithium ion battery aqueous positive-pole composite current collector and is coated in the positive active material on described lithium ion battery aqueous positive-pole composite current collector two surfaces, positive active material is made up of the component of following percentage by weight: LiFePO4 95%, SuperP2%, acrylic acid-acrylamide-acrylonitrile copolymer 3%.
The preparation method of above-mentioned positive plate comprises the steps: 2400g acrylic acid-acrylamide-acrylonitrile copolymer to be dissolved in 6000g water, after Homogeneous phase mixing, add 240gSuperP, after Homogeneous phase mixing, add 1140g LiFePO4 again, Homogeneous phase mixing, adjusting viscosity is 5100mPas, obtained anode sizing agent after de-bubble is filtered, the solid content of gained anode sizing agent is 56%, adopted by anode sizing agent extrusion coating machine to be evenly coated on above-mentioned lithium ion battery aqueous positive-pole composite current collector, obtain positive plate.
The lithium ion battery of the present embodiment, comprise battery container, battery core and electrolyte, battery core and electrolyte are sealed in battery container, battery core comprises positive pole, negative pole and the barrier film between both positive and negative polarity, wherein just very above-mentioned positive plate, negative pole is graphite cathode of the prior art, and barrier film adopts the double-deck microporous barrier of PP.
The lithium ion battery of the present embodiment adopts lamination to make battery core, and conventionally in method make the soft bag lithium ionic cell of 5Ah.
Comparative example
Collector in this comparative example adopts aluminium foil of the prior art.
Positive plate in this comparative example comprises aluminium foil and is coated in the positive active material on aluminium foil two sides, positive active material is made up of the component of following percentage by weight: the binding agent LA132 of 3%, the SuperP of 3%, the LiFePO4 of 94%, the method conventionally obtains positive plate.
The lithium ion battery of this comparative example, comprise battery container, battery core and electrolyte, battery core and electrolyte are sealed in battery container, battery core comprises positive pole, negative pole and the barrier film between both positive and negative polarity, wherein just very above-mentioned positive plate, negative pole is graphite cathode of the prior art, and barrier film adopts the double-deck microporous barrier of PP.Adopt lamination to make battery core, and conventionally in method make the soft bag lithium ionic cell of 5Ah.
Experimental example
1) pole piece pliability test.
By the pliability of positive plate obtained in embodiment 1-3 according to the method test pole piece in GB/T1731-1993, the test result of flexility is used represent, wherein x represents the diameter of the mandrel rod that positive plate winding records when there is crackle, and test result is in table 1;
2) adhesive force test.
Adopt the mode of parallel drawing to test the adhesive force of positive active material coating on positive plate positive plate obtained in embodiment 1-3, adhesive force peel strength represents, peel strength larger explanation adhesive force is larger, and test result is in table 1;
3) interface resistance test.
Positive plate obtained in embodiment 1-3 is adopted AC impedance negotiation surface resistance test fixture test pole piece interface resistance size, test result is in table 1.
Table 1
4) inner walkway.
Alternating current impedance instrument is adopted to test its AC internal Resistance the lithium ion battery in embodiment 1-3, the AC internal Resistance normal distribution of AC internal Resistance test as shown in Figure 2, and adopting DC impedance tester to test its DC internal resistance DCR, DC internal resistance DCR test result is as shown in Figure 3;
5) high rate performance and cycle performance test.
Lithium ion battery in embodiment 1-3 is tested in Battery formation detection system its high rate performance and 55 DEG C of high temperature cyclic performances, wherein high rate performance tests under 0.3C charging, 2C discharging condition, and test result as shown in Figure 4; High temperature cyclic performance tests under the condition of 1C charging, 1C electric discharge, and test result as shown in Figure 5.
As can be seen from table 1 and Fig. 1-4, adopt the pole piece pliability of lithium ion battery aqueous positive-pole composite current collector of the present invention better, adhesive force is also far longer than pole piece of the prior art, reach 14.5-16.4N/m, surface resistance is less than the surface resistance of pole piece of the prior art, is 0.06-0.09 Ω/mm 2, utilize the lithium ion battery internal resistance of above-mentioned collector less, high rate performance and cycle performance are obtained for and increase substantially.

Claims (10)

1. a lithium ion battery aqueous positive-pole composite current collector, is characterized in that, adopts the preparation method comprised the steps to obtain:
1) binding agent is added in solvent, mix, obtain binder solution; The mass ratio of described binding agent and solvent is 1:10-30;
2) to step 1) in add conductive agent in obtained binder solution, mix, grinding emulsification, obtains electrocondution slurry; The mass ratio of described conductive agent and binding agent is 1-99:1;
3) by step 2) in obtained electrocondution slurry be coated in anode collection surface, dry, to obtain final product.
2. lithium ion battery aqueous positive-pole composite current collector as claimed in claim 1, it is characterized in that, described conductive agent is one or more in SuperP, KS-6, carbon fiber, carbon nano-tube, Graphene.
3. lithium ion battery aqueous positive-pole composite current collector as claimed in claim 1, it is characterized in that, described solvent is 1-METHYLPYRROLIDONE or water.
4. lithium ion battery aqueous positive-pole composite current collector as claimed in claim 1, is characterized in that, described step 3) in dry temperature be 60-140 DEG C.
5. lithium ion battery aqueous positive-pole composite current collector as claimed in claim 1, it is characterized in that, described binding agent is one or more in polyvinylidene fluoride, polyvinyl alcohol, polyurethane, sodium carboxymethylcellulose, butadiene-styrene rubber, polyacrylate, polyacrylonitrile, polyacrylamide, ethylene-vinyl acetate copolymer emulsion.
6. lithium ion battery aqueous positive-pole composite current collector as claimed in claim 1, it is characterized in that, described plus plate current-collecting body is aluminium foil, and the thickness of aluminium foil is 10-25 μm.
7. lithium ion battery aqueous positive-pole composite current collector as claimed in claim 1, it is characterized in that, the surface density of described conductive coating is 0.1-10g/m 2.
8. a positive plate, it is characterized in that, comprise lithium ion battery aqueous positive-pole composite current collector as described in claim 1-7 any one and the positive active material of lithium ion battery aqueous positive-pole composite current collecting surface as described in being coated in, described positive active material is made up of the component of following percentage by weight: positive electrode 90%-98%, conductive agent 0.5%-8%, positive electrode binder 1.5%-8%.
9. the preparation method of positive plate as claimed in claim 8, it is characterized in that, comprise the steps: positive electrode binder and water Homogeneous phase mixing, add conductive agent again, add positive electrode after mixing, mix to obtain anode sizing agent, anode sizing agent is coated in described lithium ion battery aqueous positive-pole composite current collecting surface, drying, to obtain final product; The mass ratio of described positive electrode binder and water is 1:20-50.
10. a lithium ion battery, is characterized in that, uses positive plate as claimed in claim 8.
CN201510723952.0A 2015-10-30 2015-10-30 Lithium ion battery aqueous positive-pole composite current collector, positive plate and preparation method thereof, lithium ion battery Active CN105261760B (en)

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CN106972193A (en) * 2017-03-27 2017-07-21 湖北猛狮新能源科技有限公司 A kind of high magnification fills the preparation method of lithium ion battery soon
CN107039636A (en) * 2017-03-30 2017-08-11 湖北金泉新材料有限责任公司 Anode pole piece preparation method, anode pole piece, preparation method of lithium ion battery
CN107887571A (en) * 2017-09-26 2018-04-06 中航锂电(洛阳)有限公司 A kind of lithium ion battery composite anode pole piece and preparation method thereof, lithium ion battery
CN109273722A (en) * 2018-08-24 2019-01-25 台州钱江新能源研究院有限公司 A kind of cathode current collector water based protective coatings
CN110160680A (en) * 2019-06-17 2019-08-23 西南大学 A method of the slurry of microgrid shape structure electrode is obtained based on silk-screen printing and its prepares microgrid shape structure electrode
CN112599780A (en) * 2020-12-14 2021-04-02 中国科学院过程工程研究所 Method for modifying surface of current collector of lithium slurry battery

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