CN109411762A - A kind of utter misery aluminium foil and preparation method thereof - Google Patents
A kind of utter misery aluminium foil and preparation method thereof Download PDFInfo
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- CN109411762A CN109411762A CN201811136770.3A CN201811136770A CN109411762A CN 109411762 A CN109411762 A CN 109411762A CN 201811136770 A CN201811136770 A CN 201811136770A CN 109411762 A CN109411762 A CN 109411762A
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- aluminium foil
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- conductive
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of carbon-coated aluminum foils and preparation method thereof, the carbon-coated aluminum foils include aluminium foil ontology, the aluminium foil ontology successively outside composite conductive layers and CNT conductive layer, the preparation method of the utter misery aluminium foil, comprising the following steps: S1: pre-process aluminium foil ontology；S2: binder and solvent are mixed evenly, two or more conductive agents are then added, and are uniformly mixed, are obtained composite conducting slurry；S3: composite conducting slurry being fitted into electrostatic spinning apparatus, is sprayed to aluminium foil, and then drying obtains the compound utter misery aluminium foil of first layer；S4: binder and solvent are mixed evenly, and CNT conductive agent is added, and are uniformly mixed and are obtained CNT electrocondution slurry；S5: CNT electrocondution slurry is fitted into electrostatic spinning apparatus, and CNT conductive layer is sprayed on the compound utter misery aluminium foil of first layer, and drying obtains utter misery aluminium foil.The double-deck coating utter misery aluminium foil prepared by the present invention improves the electric conductivity, high rate performance and cycle performance of conductive agent and aluminium foil ontology.
Description
Technical field
The invention belongs to technical field of lithium ion, and in particular to arrive a kind of utter misery aluminium foil and preparation method thereof.
Background technique
Increasingly depleted with fossil energy, greenhouse effects constantly aggravate, and forcing people to constantly look for one kind can slow down
Energy crisis, and it is avoided that the novel environment friendly new energy of environmental pollution, therefore power of the lithium ion battery as electric car.
Aluminum foil current collector plays the function of attachment activity substance and electronic conduction in lithium battery.In currently used carbon-coated aluminum foils, apply
Layer of charcoal is usually to be made of the electrically conductive graphite of single layer and carbon black granules, this layer can play reduction contact resistance and pole from layer of charcoal is applied
The effect of change.But as lithium battery further increases the requirements such as high rate performance and cycle performance, single conductive agent is constituted
Single layer of conductive apply the needs that layer of charcoal has been unsatisfactory for lithium battery development, therefore the bilayer or multilayer utter misery being made of a variety of conductive agents
The research of layer is extremely urgent.CNT (carbon nanotube) has one-dimensional " tubulose " structure, can form line with material and contact, can be into
One step promotes battery conductive performance, while heat dissipation when the good thermal conductivity of carbon nanotube also helps battery charging and discharging, reduces
The polarization of battery improves the high temperature performance of battery, extends battery cycle life, and CNT is used on aluminium foil as painting layer of charcoal tool
There is extremely strong innovation and practicality.
Chinese patent (CN 106602076A) discloses a kind of utter misery aluminium foil, preparation method and application, and utter misery aluminium foil is by aluminium
Foil and at least one surface of aluminium foil set gradually P layers of super, graphene layer and hybrid conductive layer outward, and the mixing is led
Electric layer in VGCF, CNT and Super P at least two.First layer uses super P layers, and electric conductivity is not strong, and three layers are led
Electric layer combination process increases production cost, causes heat dissipation effect bad.
Summary of the invention
The purpose of the present invention is to provide a kind of utter misery aluminium foil and preparation method thereof, solve to propose in above-mentioned background is asked
Topic.
To achieve the above object, the invention provides the following technical scheme:
A kind of carbon-coated aluminum foils, including aluminium foil ontology, successively outside composite conductive layers and CNT are conductive for the aluminium foil ontology
Layer.
Further, the composite conductive layers with a thickness of 0.1~4 μm.
Further, the CNT conductive layer with a thickness of 0.1~4 μm.
Further, the composite conductive layers be CNT, graphite, carbon black, acetylene black, graphene and VGCF in two kinds or
A variety of to be combined, a variety of conductive agents can be mutually complementary, improves the electric conductivity of conductive agent and aluminium foil.
CNT is called carbon nanotube, has one-dimensional " tubulose " structure, can be with the materials such as LiFePO4, ternary and LiMn2O4
Line contact is formed, can further promote battery conductive performance, while the good thermal conductivity of carbon nanotube also helps battery charge and discharge
Heat dissipation when electric reduces the polarization of battery.
A kind of preparation method of utter misery aluminium foil, comprising the following steps:
S1: aluminium foil ontology is pre-processed；
S2: binder and solvent are mixed evenly, two or more conductive agents are then added, and are uniformly mixed, are obtained
Composite conducting slurry；
S3: composite conducting slurry being fitted into electrostatic spinning apparatus, is sprayed to aluminium foil, and then drying obtains first layer
Compound utter misery aluminium foil；
S4: binder and solvent are mixed evenly, and CNT conductive agent is added, and are uniformly mixed and are obtained CNT electrocondution slurry；
S5: CNT electrocondution slurry is fitted into electrostatic spinning apparatus, and it is conductive that CNT is sprayed on the compound utter misery aluminium foil of first layer
Layer, drying obtain utter misery aluminium foil.
Further, the binder is polytetrafluoroethylene (PTFE), Kynoar, polyolefins, polyvinyl alcohol, polyacrylic acid
With one of polyurethane or a variety of.
Further, the solvent is one of ionized water, methanol, ethyl alcohol, propyl alcohol, butanol, isopropanol or a variety of.
Further, the pretreatment of the aluminium foil ontology, which refers to, removes aluminium foil surface dirt, impurity using acetic acid etc..
Further, electrostatic spraying voltage 15-20kV, solution flow velocity are 0.5-3mLh-1, electrostatic spinning nozzle and aluminium
The distance of foil is 0.5-10cm.
Further, the composite conducting slurry solid content is 5%-30%, and the CNT electrocondution slurry solid content is 2%-
25%, slurry viscosity 10-300mPaS, binder content 1-10%.
Compared with prior art, the beneficial effects of the present invention are:
1, utter misery aluminium foil of the present invention is using the double-deck carbon coating, and composite conductive layers are adjacent with aluminium foil ontology, improves conductive agent
With the electric conductivity, high rate performance and cycle performance of aluminium foil ontology.
2, the present invention coats CNT conductive layer in aluminium foil outer body, can be positive with LiFePO4, ternary and LiMn2O4 etc.
Material forms line contact, can further promote battery conductive performance, while the good thermal conductivity of carbon nanotube also helps battery
Heat dissipation when charge and discharge reduces the polarization of battery.
3, the present invention prepares the double-deck utter misery aluminium foil using electrostatic spray, and electrocondution slurry dosage is few and uniformly divides on aluminium foil
Cloth improves energy density, high rate performance and the cycle performance of battery.
Detailed description of the invention
Fig. 1 is utter misery aluminium foil structure schematic diagram.
In figure, 1- aluminium foil ontology, 2- composite conductive layers, 3-CNT conductive layer
Fig. 2 is to use utter misery aluminium foil internal resistance comparison diagram of the present invention.
Fig. 3 is to use utter misery aluminium foil cycle performance of lithium ion battery comparison diagram of the present invention.
Fig. 4 is to use utter misery aluminium foil lithium ion battery multiplying power discharging property comparison diagram of the present invention.
Fig. 5 is to use utter misery aluminium foil lithium ion battery multiplying power charging performance comparison diagram of the present invention.
Specific embodiment
Embodiment 1
A kind of aluminium foil ontology, as shown in Figure 1, from inside to outside successively by aluminium foil ontology 1, CNT+Super P composite conductive layers 2
It is constituted with CNT conductive layer 3.
The utter misery aluminium foil the preparation method is as follows:
1) aluminium foil is pre-processed first: removes aluminium foil surface dirt, impurity etc. using using acetic acid etc.；
2) polytetrafluoroethylene (PTFE) and ethyl alcohol are mixed evenly, CNT and Super P conductive agent are then added, be uniformly mixed,
Obtain composite conducting slurry.Wherein, composite conducting slurry solid content is 25%, CNT mass fraction 15%, Super P mass point
Number 10%, binder content 5%, slurry viscosity 250mPaS.
3) electrocondution slurry is fitted into electrostatic spinning apparatus again, adjusting Static Spinning voltage is 20kV, and solution flow velocity is 2mL
h-1, electrostatic spinning nozzle is 5cm at a distance from aluminium foil, is sprayed to aluminium foil, then drying obtains the compound utter misery aluminium of first layer
Foil, coating thickness are 2 μm.
4) polytetrafluoroethylene (PTFE) and ethyl alcohol are mixed evenly, CNT conductive agent is added, be uniformly mixed and obtain CNT conductive paste
Material repeats step 3), and coating obtains CNT coating on first layer conductive composite coating, and coating thickness is 1 μm, finally obtains packet
The double-deck carbon-coated aluminum foils containing conductive composite coating and CNT coating, coating overall thickness are 3 μm.Wherein, CNT applies conductive paste in layer of charcoal
Expect that solid content is 15%, binder content 4%, slurry viscosity 180mPaS.
5) the aluminium foil back side is coated according to above step, finally obtains the bilayer conductive that tow sides are respectively 3 μm
Coating.
2, application of the utter misery aluminium foil in lithium ion anode piece
The lithium iron phosphate cathode slurry being prepared is coated on the utter misery aluminium foil prepared, is dried at 95 DEG C, roll-in,
The soft package lithium battery that capacity is 10Ah is obtained after cross cutting, lamination, is defined as experimental group in the present embodiment.
The proportion of anode sizing agent is, based on mass fraction, LiFePO4 95%, Super P 2%, PVDF3%, solvent is
N-Methyl pyrrolidone, compacted density 2.25g/cm3。
Embodiment 2
A kind of aluminium foil ontology, from inside to outside successively by aluminium foil ontology, CNT+ graphene composite conductive layer and CNT conductive layer 3
It constitutes.
The utter misery aluminium foil the preparation method is as follows:
1) aluminium foil is pre-processed first: removes aluminium foil surface dirt, impurity etc. using using acetic acid etc.；
2) polytetrafluoroethylene (PTFE) and ethyl alcohol are mixed evenly, CNT and graphene conductive agent are then added, be uniformly mixed,
Obtain composite conducting slurry.Wherein, composite conducting slurry solid content is 15%, CNT mass fraction 5%, graphene mass fraction
10%, binder content 5%, slurry viscosity 250mPaS.
3) electrocondution slurry is fitted into electrostatic spinning apparatus again, adjusting Static Spinning voltage is 20kV, and solution flow velocity is 2mL
h-1, electrostatic spinning nozzle is 5cm at a distance from aluminium foil, is sprayed to aluminium foil, then drying obtains the compound utter misery aluminium of first layer
Foil, coating thickness are 1 μm.
4) polytetrafluoroethylene (PTFE) and ethyl alcohol are mixed evenly, CNT conductive agent is added, be uniformly mixed and obtain CNT conductive paste
Material repeats step 3), and coating obtains CNT coating on first layer conductive composite coating, and coating thickness is 1 μm, finally obtains packet
The double-deck carbon-coated aluminum foils containing conductive composite coating and CNT coating, coating overall thickness are 2 μm.Wherein, CNT applies conductive paste in layer of charcoal
Expect that solid content is 15%, binder content 5%, slurry viscosity 250mPaS.
5) the aluminium foil back side is coated according to above step, finally obtains the bilayer conductive that tow sides are respectively 2 μm
Coating.
Embodiment 3
A kind of aluminium foil ontology, from inside to outside successively by aluminium foil ontology, CNT+Super P+ graphene composite conductive layer and CNT
Conductive layer 3 is constituted.
The utter misery aluminium foil the preparation method is as follows:
1) aluminium foil is pre-processed first: removes aluminium foil surface dirt, impurity etc. using using acetic acid etc.；
2) polytetrafluoroethylene (PTFE) and ethyl alcohol are mixed evenly, CNT, Super P and graphene conductive agent is then added, mixed
It closes uniformly, obtains composite conducting slurry.Wherein, composite conducting slurry solid content is 30%, CNT mass fraction 15%, graphene
Mass fraction 10%, the mass fraction of Super P are 5%, binder content 5%, slurry viscosity 250mPaS.
3) electrocondution slurry is fitted into electrostatic spinning apparatus again, adjusting Static Spinning voltage is 20kV, and solution flow velocity is 2mL
h-1, electrostatic spinning nozzle is 5cm at a distance from aluminium foil, is sprayed to aluminium foil, then drying obtains the compound utter misery aluminium of first layer
Foil, coating thickness are 2 μm.
4) polytetrafluoroethylene (PTFE) and ethyl alcohol are mixed evenly, CNT conductive agent is added, be uniformly mixed and obtain CNT conductive paste
Material repeats step 3), and coating obtains CNT coating on first layer conductive composite coating, and coating thickness is 2 μm, finally obtains packet
The double-deck carbon-coated aluminum foils containing conductive composite coating and CNT coating, coating overall thickness are 2 μm.Wherein, CNT applies conductive paste in layer of charcoal
Expect that solid content is 15%, binder content 5%, slurry viscosity 250mPaS.
5) the aluminium foil back side is coated according to above step, finally obtains the bilayer conductive that tow sides are respectively 4 μm
Coating.
Comparative example 1
Using the common utter misery aluminium foil with single layer Super P coating bought in the market, the utter misery aluminium foil lithium from
Applicating adn implementing example 1 in sub- positive plate is identical.
As shown in Fig. 2, can see by embodiment 1 and 1 utter misery aluminium foil internal resistance of comparative example, the utter misery aluminium foil of embodiment 1
Internal resistance average value is 10.7m Ω, and the utter misery aluminium foil internal resistance average value of comparative example 1 is 37.28m Ω, illustrates to apply using the present invention
The internal resistance of cell is effectively reduced in the lithium ion battery of charcoal aluminium foil.
It is can be seen that from the cycle performance of lithium ion battery as shown in figure 3, being used in embodiment 1 by 1200 circulations
The capacity of lithium ion battery conservation rate of utter misery aluminium foil of the present invention is very high, and cycle performance is excellent, and the present invention is not used in comparative example 1
Quickly, cycle performance is poor for carbon-coated aluminum foils loop attenuation.
It can be seen that as shown in Figure 4 and Figure 5, under the conditions of identical multiplying power from the cycle performance of lithium ion battery
(0.5C) has higher discharge platform voltage using the lithium ion battery of utter misery aluminium foil of the present invention in embodiment 1 and lower fills
Electric platform voltage, and and in comparative example 1 be not used carbon-coated aluminum foils of the present invention lithium ion battery multiplying power discharging platform voltage it is lower,
Multiplying power charging platform voltage is higher, and illustrating can be effective in the rate charge-discharge using the lithium ion battery of utter misery aluminium foil of the present invention
Battery polarization is reduced, high rate performance is promoted.
The preferred embodiment of the patent is described in detail above, but this patent is not limited to above-mentioned embodiment party
Formula within the knowledge of one of ordinary skill in the art can also be under the premise of not departing from this patent objective
It makes a variety of changes.
Claims (10)
1. a kind of carbon-coated aluminum foils, which is characterized in that including aluminium foil ontology, the aluminium foil ontology successively outside composite conductive layers and
CNT conductive layer.
2. carbon-coated aluminum foils according to claim 1, which is characterized in that the composite conductive layers with a thickness of 0.1~4 μm.
3. carbon-coated aluminum foils according to claim 1, which is characterized in that the CNT conductive layer with a thickness of 0.1~4 μm.
4. carbon-coated aluminum foils according to claim 1 to 3, which is characterized in that the composite conductive layers be CNT, graphite,
Two or more in carbon black, acetylene black, graphene and VGCF are combined.
5. a kind of preparation method of utter misery aluminium foil as described in claim 1, which comprises the following steps:
S1: aluminium foil ontology is pre-processed；
S2: binder and solvent are mixed evenly, two or more conductive agents are then added, and are uniformly mixed, are obtained compound
Electrocondution slurry；
S3: composite conducting slurry being fitted into electrostatic spinning apparatus, is sprayed to aluminium foil, and then it is compound to obtain first layer for drying
Utter misery aluminium foil；
S4: binder and solvent are mixed evenly, and CNT conductive agent is added, and are uniformly mixed and are obtained CNT electrocondution slurry；
S5: CNT electrocondution slurry is fitted into electrostatic spinning apparatus, and CNT conductive layer is sprayed on the compound utter misery aluminium foil of first layer, is dried
It is dry to obtain utter misery aluminium foil.
6. the preparation method of utter misery aluminium foil according to claim 5, which is characterized in that the binder is polytetrafluoroethyl-ne
One of alkene, Kynoar, polyolefins, polyvinyl alcohol, polyacrylic acid and polyurethane are a variety of.
7. the preparation method of utter misery aluminium foil according to claim 5, which is characterized in that the solvent be ionized water, methanol,
One of ethyl alcohol, propyl alcohol, butanol, isopropanol are a variety of.
8. the preparation method of utter misery aluminium foil according to claim 5, which is characterized in that the pretreatment of the aluminium foil ontology is
Refer to and removes aluminium foil surface dirt, impurity using acetic acid etc..
9. the preparation method of utter misery aluminium foil according to claim 5, which is characterized in that electrostatic spraying voltage 15-20kV,
Solution flow velocity is 0.5-3mLh-1, electrostatic spinning nozzle is 0.5-10cm at a distance from aluminium foil.
10. according to the preparation method of any utter misery aluminium foil of claim 5-9, which is characterized in that the composite guide plasma-based
Material solid content is 5%-30%, and the CNT electrocondution slurry solid content is 2%-25%, slurry viscosity 10-300mPaS, is glued
Knot agent content is 1-10%.
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| CN201811136770.3A CN109411762A (en) | 2018-09-28 | 2018-09-28 | A kind of utter misery aluminium foil and preparation method thereof |
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| CN201811136770.3A CN109411762A (en) | 2018-09-28 | 2018-09-28 | A kind of utter misery aluminium foil and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290028A (en) * | 2020-10-22 | 2021-01-29 | 合肥国轩高科动力能源有限公司 | Preparation method of lithium ion battery negative current collector |
| CN112864398A (en) * | 2021-01-27 | 2021-05-28 | 江苏智泰新能源科技有限公司 | Conductive coating, coating method and application |
| CN115000413A (en) * | 2022-06-07 | 2022-09-02 | 南京工程学院 | Heat-resistant carbon-coated aluminum foil for current collector of power battery and preparation method of heat-resistant carbon-coated aluminum foil |
| CN117352738A (en) * | 2023-11-08 | 2024-01-05 | 丽岛新能源(安徽)有限公司 | Carbon-coated aluminum foil and preparation method thereof |
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