CN105470517A - Positive electrode and positive electrode paste with high energy density, and battery containing positive electrode - Google Patents
Positive electrode and positive electrode paste with high energy density, and battery containing positive electrode Download PDFInfo
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- CN105470517A CN105470517A CN201510799185.1A CN201510799185A CN105470517A CN 105470517 A CN105470517 A CN 105470517A CN 201510799185 A CN201510799185 A CN 201510799185A CN 105470517 A CN105470517 A CN 105470517A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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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
- H01M10/052—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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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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 invention relates to a positive electrode and positive electrode paste with high energy density, and a battery containing the positive electrode, in particular to the positive electrode paste with high energy density, belonging to the technical field of batteries. The positive electrode paste with high energy density comprises the following constituents based on weight: 100 parts of positive active substance, 0.01-0.1 part of composite conductive agent, 0.4-3.0 parts of adhesive and 30-50 parts of solvent, wherein the composite conductive agent comprises a single-walled carbon nanotube and graphene, the mass ratio of the single-walled carbon nanotube to the graphene is (0.1-10):1, the specific surface area of the single-walled carbon nanotube is 500-700 m<2>/g, the tube diameter is 0.7-1.8 nanometers, the tube length is more than 5 micrometers, and the specific surface area of the graphene is over 2,000 m<2>/g. Compared with the prior art, the positive electrode paste has the advantages that by adjusting the formula and the dosage of the conductive agent, the energy density can be effectively improved, and the cost is relatively low.
Description
Technical field
The invention belongs to cell art, particularly relate to a kind of there is high-energy-density positive pole and slurry thereof and comprise the battery of this positive pole.
Background technology
Lithium ion battery generally comprises positive plate, negative plate, is interval in barrier film between positive/negative plate, and electrolyte, wherein, positive plate comprises plus plate current-collecting body and is distributed in the positive pole coating on plus plate current-collecting body, and negative plate comprises negative current collector and is distributed in the negative pole coating on negative current collector.Positive pole coating generally comprises positive active material, conductive agent and bonding agent etc., and negative pole coating generally comprises negative electrode active material, conductive agent and bonding agent etc., and at present, conventional lithium ion anode material is LiCoO
2and LiNiCoMnO
2tertiary cathode material etc.
At present, the battery that the consumption electronic product such as mobile phone and panel computer uses, gradually towards lightening future development, therefore, develops the focus that the battery with more high-quality energy density or volume energy density becomes lithium ion battery development.A lot of document and patent report, by effectively adulterating and coating technology means, improve the charge cutoff voltage of cobalt acid lithium or tertiary cathode material, improve discharge capacity, thus promote its energy density, but, this method cost is higher, and raising effect is not remarkable especially.
The positive conductive agent of the lithium rechargeable battery of current most of manufacturer production mostly is pure nano-carbon tube, its
Addition mostly is 0.8% ~ 1.2%, and substantially cannot reduce its consumption, and therefore, battery exists that energy density is low, battery core difference of magnification, long circulation life are poor, high in cost of production problem.
In view of this, necessary provide a kind of there is high-energy-density positive pole and slurry thereof and comprise the battery of this positive pole, it is by studying the anode formula of lithium ion battery, regulates formula and the consumption of conductive agent, effectively can promote energy density, and cost is lower.
Summary of the invention
An object of the present invention is: for the deficiencies in the prior art, and a kind of anode sizing agent with high-energy-density is provided, it is by studying the anode formula of lithium ion battery, regulates formula and the consumption of conductive agent, effectively can promote energy density, and cost is lower.
In order to achieve the above object, the present invention adopts following technical scheme:
There is an anode sizing agent for high-energy-density, by weight, comprise following component:
Positive active material 100 parts;
Combined conductive agent 0.01 part ~ 0.1 part;
Bonding agent 0.4 part ~ 3.0 parts;
Solvent 30 parts ~ 50 parts;
Described combined conductive agent comprises Single Walled Carbon Nanotube and Graphene, and the mass ratio of described Single Walled Carbon Nanotube and described Graphene is (0.1 ~ 10): 1;
The specific area 500m of described Single Walled Carbon Nanotube
2/ g ~ 700m
2/ g, caliber is 0.7nm ~ 1.8nm, and pipe range is greater than 5 μm;
The specific area of described Graphene is 2000m
2/ more than g.
Relative to prior art, the present invention is by adding the combined conductive agent of minute quantity, the i.e. mixture of Single Walled Carbon Nanotube and Graphene, utilize the cooperative effect between conductive agent, reduce the use amount of conductive agent and bonding agent, improve the content of positive active material, on the basis of not sacrificing the original performance of battery, can improve the energy density of positive pole, increase rate is between 0.5% ~ 1.6%, and compacted density improves 0.1 ~ 0.15g/cm on original basis
3, and then promote the energy density of lithium ion battery, such that battery capacity is high, good rate capability, long circulating excellent performance, cost are low, to meet the requirement of client to performances such as battery high energy metric density, long-lives.
In simple carbon nanotube conducting glue, carbon nano-tube is easily intertwined, thus reunites, and causes dispersion bad, can not form the extraordinary electrocondution slurry of homogeneity.Common carbon nanotube diameter is 5-200 nanometer, and in wire, and positive electrode is the graininess of 15 microns, and this otherness makes carbon nano-tube and positive electrode exist with point cantact state, thus have impact on the electric conductivity of lithium ion battery; And graphene film easily overlaps in single graphene conductive glue, then sedimentation, thus the utilance reducing Graphene, and then the increase of consumption causing Graphene in whole electrode formulation.Therefore, simple carbon nano-tube and the Graphene of using can not realize good conductive effect.
And the electrocondution slurry of Graphene and carbon nano-tube compound can give full play to the advantage of Graphene and carbon nano-tube, avoid the shortcoming each other in application: the carbon nano-tube between graphene sheet layer and lamella can prevent the stacked of graphene film; The lamellar structure of graphene film can play support effect to carbon nano-tube, thus carbon nano-tube can be prevented to be wound around.Carbon nano-tube, graphene nanometer sheet composite mortar can form a little-three-dimensional comprehensively conductive network the structure in line-face, better conductive effect can be reached with less use amount, thus promote the performance (good, the high rate performance of low temperature discharge excellent in cycle performance) of lithium ion battery.
(annulus that the curling docking of 30-300 layer graphite linings gets up to be formed is equivalent to, specific area: 50-150m compared to multi-walled carbon nano-tubes
2/ g), Single Walled Carbon Nanotube be equivalent to single-layer graphene curling after be butted into an annulus, therefore, there is better conductivity, thermal conductivity, and specific area is suitable with Graphene.Therefore, as electrocondution slurry, the consumption of Single Walled Carbon Nanotube is less, and conductivity is better.Therefore compared to multi-walled carbon nano-tubes/graphene composite conductive glue, Single Walled Carbon Nanotube/graphene composite conductive glue consumption is less, and battery performance is better, and the energy density of battery is higher.
In addition, positive pole adds minute quantity single-walled nanotube and graphene composite conductive agent, there is the characteristic such as superconduct, super heat radiation, high imbibition, form point-line-surface conductive network, do not improving positive electrode voltage, do not change core strueture, as adopted ultra-thin barrier film, aluminium foil, Copper Foil etc., under the prerequisite causing some performance of battery core to sacrifice, by reducing the use amount of conductive agent, improve the amount of positive active material, and then promote the energy density of battery.The conventional employing superconduction carbon of contrast, Graphene, carbon nano-tube as the anode sizing agent formula of conductive agent, the cost of the lithium ion battery made by anode sizing agent formula of the present invention is low, low temperature discharge good, high rate performance and cycle performance excellent.
The one as the present invention with the anode sizing agent of high-energy-density is improved, and by weight, comprises following component:
Positive active material 100 parts;
Combined conductive agent 0.02 part ~ 0.08 part;
Bonding agent 0.6 part ~ 2.2 parts;
Solvent 35 parts ~ 45 parts.
The one as the present invention with the anode sizing agent of high-energy-density is improved, and described Single Walled Carbon Nanotube is made up of individual layer cylindrical graphite layer, and its electron mobility is more than or equal to 2 × 10
5cm2/Vs, the distribution of its diameter is little, and defect is few, has higher uniformity consistency, and resistivity is 10
-6Ω cm, conductive coefficient reaches 6000W/m.k.
The one as the present invention with the anode sizing agent of high-energy-density is improved, and the electron mobility of described Graphene is more than or equal to 1.5 × 105cm
2/ Vs.Graphene is the Two Dimensional Free state atomic crystal of unique existence at present, has excellent electronics and mechanical performance.The interlamellar spacing of the Graphene that the present invention uses is 0.34nm, and resistivity is 10
-6Ω cm, conductive coefficient reaches 5300W/mk.
The one as the present invention with the anode sizing agent of high-energy-density is improved, and the mass ratio of described Single Walled Carbon Nanotube and described Graphene is (2 ~ 5): 1.The mixture of described Single Walled Carbon Nanotube and described Graphene has the characteristic such as superconduct, super heat radiation, high imbibition, can form point-line-surface conductive network.The mass ratio of described Single Walled Carbon Nanotube and described Graphene is preferably 3:1.
The one as the present invention with the anode sizing agent of high-energy-density is improved, and described positive active material is at least one in cobalt acid lithium, LiMn2O4, lithium nickelate, nickle cobalt lithium manganate, LiFePO4 and nickel cobalt lithium aluminate.
The one as the present invention with the anode sizing agent of high-energy-density is improved, and described bonding agent is at least one in polytetrafluoroethylene, sodium carboxymethylcellulose, sodium alginate and butadiene-styrene rubber; Described solvent is 1-METHYLPYRROLIDONE and/or water.
The one as the present invention with the anode sizing agent of high-energy-density is improved, and its preparation method comprises the following steps:
The first step, adds bonding agent in solvent, stirs in power mixing apparatus, prepares bonding agent glue;
Second step, adds in bonding agent glue by Single Walled Carbon Nanotube and graphene composite conductive glue, stirs, obtain mixed glue solution in power mixing apparatus;
Or, by Single Walled Carbon Nanotube dry powder and Graphene dry powder blend, add surfactant, in grinding distribution equipment, be dispersed into conductive gelatin, then this conductive gelatin is added in bonding agent glue, stir in power mixing apparatus, obtain mixed glue solution; Described surfactant is at least one in polyethylene glycol, PVP and polyvinyl alcohol, and the mass ratio of described Graphene dry powder and described surfactant is 10:(0.5 ~ 2);
3rd step, adds positive active material dry powder in the obtained mixed glue solution of second step, stirs, namely obtain the anode sizing agent with high-energy-density in power mixing apparatus.
The method can prepare the anode sizing agent mixed, and makes described Single Walled Carbon Nanotube and forms the three-dimensional conductive network of point-line-surface between described Graphene and positive active material.
Another object of the present invention is to provide a kind of positive pole with high-energy-density, it is characterized in that, comprise plus plate current-collecting body and be coated on the positive pole coating on described plus plate current-collecting body, described positive pole coating is anode sizing agent of the present invention is coated on described plus plate current-collecting body and coating that is dry, that roll rear formation.
A further object of the invention is to provide a kind of battery, comprises positive pole, negative pole, is interval in barrier film between described positive pole and described negative pole, the described positive pole with high-energy-density just very of the present invention.
Relative to prior art, the present invention is by regulating the formula of conductive agent and consumption, and battery is had, and excellent low temperature discharge is good, high rate performance and cycle performance.
Accompanying drawing explanation
Fig. 1 is the EIS figure of the embodiment of the present invention 1 and comparative example 1.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention and Advantageous Effects thereof are described in detail.
Embodiment 1
Present embodiments provide a kind of anode sizing agent with high-energy-density, by weight, comprise following component:
Positive active material 100 parts;
Combined conductive agent 0.04 part;
Kynoar 0.9 part;
1-METHYLPYRROLIDONE 42.4 parts;
Combined conductive agent comprises Single Walled Carbon Nanotube and Graphene, and the mass ratio of Single Walled Carbon Nanotube and Graphene is 3:1;
Single Walled Carbon Nanotube is made up of individual layer cylindrical graphite layer, its specific area 600m
2/ g, caliber is 1.2nm, and pipe range is greater than 5 μm, and electron mobility is greater than 2 × 10
5cm2/Vs.
The specific area of Graphene is 2000m
2/ more than g, the electron mobility of Graphene is more than or equal to 1.5 × 10
5cm2/Vs.
Its preparation method comprises the following steps:
The first step, adds in 1-METHYLPYRROLIDONE by Kynoar dry powder, stirs in power mixing apparatus, and mixing time is 3.2h, prepares Kynoar glue;
Second step, add in Kynoar glue by Single Walled Carbon Nanotube and graphene composite conductive glue, stir in power mixing apparatus, mixing time is 1.5h, obtains mixed glue solution;
3rd step, added in the obtained mixed glue solution of second step by cobalt acid lithium dry powder, stir in power mixing apparatus, mixing time is 3.2h, namely obtains the anode sizing agent with high-energy-density.
The present embodiment additionally provides a kind of positive pole with high-energy-density, comprise plus plate current-collecting body and be coated on the positive pole coating on plus plate current-collecting body, positive pole coating is for being coated on plus plate current-collecting body and coating that is dry, that roll rear formation by the anode sizing agent described in the present embodiment.Specifically, when preparing positive pole coating, first measure the viscosity of the anode sizing agent described in the present embodiment, if viscosity exceeds specification, then add NMP adjusting viscosity, then adopt 150 ~ 180 object screen clothes to carry out slurry to sieve, then adopt power coating apparatus to be coated in by slurry on aluminium foil or other foils, by baking oven, pole piece is dried, then the pole piece after drying is rolled certain thickness, again pole piece cut, weld, after rubberizing, complete the preparation of high-energy-density positive pole.
In addition, the present embodiment additionally provides a kind of battery, comprises positive pole, negative pole, is interval in barrier film between positive pole and negative pole, the positive pole with high-energy-density just very described in the present embodiment.
Embodiment 2
As different from Example 1, by weight, the anode sizing agent with high-energy-density that the present embodiment provides comprises following component:
Nickle cobalt lithium manganate 100 parts;
Combined conductive agent 0.08 part;
Kynoar 0.9 part;
1-METHYLPYRROLIDONE 46.9 parts;
The mass ratio of Single Walled Carbon Nanotube and Graphene is 2:1; The specific area 550m of Single Walled Carbon Nanotube
2/ g, caliber is 1.5nm.
Its preparation method comprises the following steps:
The first step, adds in 1-METHYLPYRROLIDONE by Kynoar dry powder, stirs in power mixing apparatus, and mixing time is 3.3h, prepares Kynoar glue;
Second step, by Single Walled Carbon Nanotube dry powder and Graphene dry powder blend, adds polyethylene glycol, in grinding distribution equipment, be dispersed into conductive gelatin, then this conductive gelatin is added in Kynoar glue, stir in power mixing apparatus, mixing time is 1.6h, obtains mixed glue solution; The mass ratio of Graphene dry powder and surfactant is 10:1;
3rd step, added in the obtained mixed glue solution of second step by cobalt acid lithium dry powder, stir in power mixing apparatus, mixing time is 3.1h, namely obtains the anode sizing agent with high-energy-density.
All the other, with embodiment 1, repeat no more here.
Embodiment 3
As different from Example 1, the anode sizing agent with high-energy-density that the present embodiment provides comprises following component:
LiMn2O4 100 parts;
Combined conductive agent 0.03 part;
Kynoar 2.2 parts;
1-METHYLPYRROLIDONE 47.5 parts;
The mass ratio of Single Walled Carbon Nanotube and Graphene is 5:1; The specific area 650m of Single Walled Carbon Nanotube
2/ g, caliber is 1.0nm.
All the other, with embodiment 1, repeat no more here.
Embodiment 4
As different from Example 2, the anode sizing agent with high-energy-density that the present embodiment provides comprises following component:
Lithium nickelate 100 parts;
Combined conductive agent 0.07 part;
1.8 parts, butadiene-styrene rubber;
38.5 parts, water;
The mass ratio of Single Walled Carbon Nanotube and Graphene is 4:1; The specific area 680m of Single Walled Carbon Nanotube
2/ g, caliber is 0.8nm.
Surfactant in second step is polyvinyl alcohol.
All the other, with embodiment 1, repeat no more here.
Embodiment 5
As different from Example 1, the anode sizing agent with high-energy-density that the present embodiment provides comprises following component:
LiFePO4 100 parts;
Combined conductive agent 0.04 part;
Sodium alginate 2.7 parts;
35.5 parts, water;
The mass ratio of Single Walled Carbon Nanotube and Graphene is 6:1; The specific area 580m of Single Walled Carbon Nanotube
2/ g, caliber is 1.6nm.
All the other, with embodiment 1, repeat no more here.
Embodiment 6
As different from Example 2, the anode sizing agent with high-energy-density that the present embodiment provides comprises following component:
Nickel cobalt lithium aluminate 100 parts;
Combined conductive agent 0.02 part;
Polytetrafluoroethylene 0.5 part;
1-METHYLPYRROLIDONE 34.9 parts;
The mass ratio of Single Walled Carbon Nanotube and Graphene is 1:1; The specific area 520m of Single Walled Carbon Nanotube
2/ g, caliber is 1.1nm.
Surfactant in second step is polyvinyl alcohol.
All the other, with embodiment 1, repeat no more here.
Embodiment 7
As different from Example 1: the mass ratio of Single Walled Carbon Nanotube and Graphene is 2:1, and all the other, with embodiment 1, repeat no more here.
Embodiment 8
As different from Example 1: the mass ratio of Single Walled Carbon Nanotube and Graphene is 5:1, and all the other, with embodiment 1, repeat no more here.
Comparative example 1
As different from Example 1:
The anode sizing agent that this comparative example provides, by weight, comprises following component:
Positive active material 100 parts;
Multi-walled carbon nano-tubes 0.8 part;
Kynoar 3 parts;
1-METHYLPYRROLIDONE 42.4 parts;
The specific area 100m of multi-walled carbon nano-tubes
2/ g, its preparation method comprises the following steps:
The first step, adds in 1-METHYLPYRROLIDONE by Kynoar dry powder, stirs in power mixing apparatus, and mixing time is 3.2h, prepares Kynoar glue;
Second step, added by multi-walled carbon nano-tubes in Kynoar glue, stir in power mixing apparatus, mixing time is 1.5h, obtains mixed glue solution;
3rd step, added in the obtained mixed glue solution of second step by cobalt acid lithium dry powder, stir in power mixing apparatus, mixing time is 3.2h, namely obtains the anode sizing agent with high-energy-density.
All the other, with embodiment 1, repeat no more here.
EIS test is carried out to the battery of embodiment 1 and comparative example 1, acquired results is shown in Fig. 1, as shown in Figure 1, because Single Walled Carbon Nanotube, graphene nanometer sheet composite mortar can form a little-three-dimensional comprehensively conductive network the structure in line-face, therefore, it is possible to reach better conductive effect with less use amount, thus promote the performance of lithium ion battery, as good in low temperature discharge, high rate performance and cycle performance excellent etc.
Carry out the test of 0.5C volumetric properties, 1.0C high rate performance test (capability retention) ,-20 DEG C of low-temperature circulating tests (capability retention) and 0.5C normal temperature loop tests (500 circulation, capability retention) to the battery of embodiment 1,7,8 and comparative example 1, acquired results is in table 1:
Table 1: the performance test results of the battery of embodiment 1,7 and 8 and comparative example 1.
As can be seen from Table 1, in the present invention, conductive agent use amount reduces about 10 times, but combination property is all done well, particularly long circulating performance.Comparing embodiment 1,7 and 8 known, the best in quality ratio of Single Walled Carbon Nanotube and Graphene is 3:1, this is because when Single Walled Carbon Nanotube ratio is large, dispersion not exclusively, and single walled carbon nanotubes rice ratio hour, effective conductive network can not be formed again, therefore battery core degradation.
Carry out the test of 0.5C volumetric properties, 1.0C high rate performance test (capability retention) ,-20 DEG C of low-temperature circulating tests (capability retention) and 0.5C normal temperature loop tests (500 circulation, capability retention) to the battery of embodiment 2-6 and comparative example 1, acquired results is in table 2:
The performance test results of the battery of table 2: embodiment 2-6 and comparative example 1.
As can be seen from Table 2, in the present invention, conductive agent use amount reduces about 10 times, but combination property is all done well, particularly long circulating performance.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change above-mentioned execution mode and revise.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (10)
1. there is an anode sizing agent for high-energy-density, it is characterized in that, by weight, comprise following component:
Positive active material 100 parts;
Combined conductive agent 0.01 part ~ 0.1 part;
Bonding agent 0.4 part ~ 3.0 parts;
Solvent 30 parts ~ 50 parts;
Described combined conductive agent comprises Single Walled Carbon Nanotube and Graphene, and the mass ratio of described Single Walled Carbon Nanotube and described Graphene is (0.1 ~ 10): 1;
The specific area 500m of described Single Walled Carbon Nanotube
2/ g ~ 700m
2/ g, caliber is 0.7nm ~ 1.8nm, and pipe range is greater than 5 μm;
The specific area of described Graphene is 2000m
2/ more than g.
2. the anode sizing agent with high-energy-density according to claim 1, is characterized in that, by weight, comprises following component:
Positive active material 100 parts;
Combined conductive agent 0.02 part ~ 0.08 part;
Bonding agent 0.6 part ~ 2.2 parts;
Solvent 35 parts ~ 45 parts.
3. the anode sizing agent with high-energy-density according to claim 1, is characterized in that, described Single Walled Carbon Nanotube is made up of individual layer cylindrical graphite layer, and its electron mobility is more than or equal to 2 × 10
5cm
2/ Vs.
4. the anode sizing agent with high-energy-density according to claim 1, is characterized in that, the electron mobility of described Graphene is more than or equal to 1.5 × 10
5cm
2/ Vs.
5. the anode sizing agent with high-energy-density according to claim 1, is characterized in that, the mass ratio of described Single Walled Carbon Nanotube and described Graphene is (2 ~ 5): 1.
6. the anode sizing agent with high-energy-density according to claim 1, is characterized in that, described positive active material is at least one in cobalt acid lithium, LiMn2O4, lithium nickelate, nickle cobalt lithium manganate, LiFePO4 and nickel cobalt lithium aluminate.
7. the anode sizing agent with high-energy-density according to claim 1, is characterized in that, described bonding agent is at least one in polytetrafluoroethylene, sodium carboxymethylcellulose, sodium alginate and butadiene-styrene rubber; Described solvent is 1-METHYLPYRROLIDONE and/or water.
8. the anode sizing agent with high-energy-density according to claim 1, it is characterized in that, its preparation method comprises the following steps:
The first step, adds bonding agent in solvent, stirs in power mixing apparatus, prepares bonding agent glue;
Second step, adds in bonding agent glue by Single Walled Carbon Nanotube and graphene composite conductive glue, stirs, obtain mixed glue solution in power mixing apparatus;
Or, by Single Walled Carbon Nanotube dry powder and Graphene dry powder blend, add surfactant, in grinding distribution equipment, be dispersed into conductive gelatin, then this conductive gelatin is added in bonding agent glue, stir in power mixing apparatus, obtain mixed glue solution; Described surfactant is at least one in polyethylene glycol, PVP and polyvinyl alcohol, and the mass ratio of described Graphene dry powder and described surfactant is 10:(0.5 ~ 2);
3rd step, adds positive active material dry powder in the obtained mixed glue solution of second step, stirs, namely obtain the anode sizing agent with high-energy-density in power mixing apparatus.
9. one kind has the positive pole of high-energy-density, it is characterized in that, comprise plus plate current-collecting body and be coated on the positive pole coating on described plus plate current-collecting body, described positive pole coating is anode sizing agent according to claim 1 is coated on described plus plate current-collecting body and coating that is dry, that roll rear formation.
10. a battery, comprises positive pole, negative pole, is interval in barrier film between described positive pole and described negative pole, it is characterized in that: the described positive pole with high-energy-density just very according to claim 9.
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| CN106675449A (en) * | 2016-12-08 | 2017-05-17 | 长兴天晟能源科技有限公司 | High safety cathode slurry adhesive for lithium ion batteries |
| CN106784679A (en) * | 2016-12-12 | 2017-05-31 | 江西安驰新能源科技有限公司 | A kind of lithium iron phosphate cathode slurry and preparation method thereof |
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| CN113906596A (en) * | 2019-10-04 | 2022-01-07 | 株式会社Lg新能源 | Electrode and secondary battery including the same |
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| CN108155358A (en) * | 2017-12-11 | 2018-06-12 | 浙江天能能源科技股份有限公司 | A kind of preparation method of lithium ion battery nickle cobalt lithium manganate anode composite material |
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| CN113675456A (en) * | 2021-08-20 | 2021-11-19 | 夏秀明 | Power type lithium ion battery monomer, power battery pack and electric vehicle |
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