CN109935837A - A kind of lithium ion battery carbon-coated aluminum foils - Google Patents
A kind of lithium ion battery carbon-coated aluminum foils Download PDFInfo
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- CN109935837A CN109935837A CN201811408431.6A CN201811408431A CN109935837A CN 109935837 A CN109935837 A CN 109935837A CN 201811408431 A CN201811408431 A CN 201811408431A CN 109935837 A CN109935837 A CN 109935837A
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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 present invention relates to affluxion body in lithium ion batteries technical fields, disclose a kind of lithium ion battery carbon-coated aluminum foils, the coating of the conductive coating of carbon-coated aluminum foils includes conductive agent, binder and solvent, conductive agent includes at least one of graphene and carbon black, carbon nanotube, layered conductive graphite, binder includes at least one of polyacrylate, polyurethane, epoxy resin, polyacrylonitrile, butadiene-styrene rubber, sodium carboxymethylcellulose, solvent includes at least one of water and dehydrated alcohol, and carbon black and graphene pass through polyvinylpyrrolidone graft modification.The present invention, as conductive agent, can be made conductive coating thermal conductivity with higher, improve the heat dissipation performance of battery using graphene；Polyvinylpyrrolidone is grafted on conductive agent surface, reduces the surface free energy of conductive agent, increases steric hindrance, the conductive agent after making graft modification has high dispersion stability.
Description
Technical field
The present invention relates to affluxion body in lithium ion batteries technical fields, more particularly, to a kind of lithium ion battery painting carbon aluminium
Foil.
Background technique
Lithium ion battery has voltage high, and energy density is big, and good cycle, self discharge is small, memory-less effect, work temperature
The advantages that range is wide is spent, with the development of the times, the application of lithium ion battery is constantly expanded on the market.In lithium ion battery,
Collector refers to that anode or cathode are used for the parent metal of attachment activity substance, and collector is in contact with active material,
Play the role of collecting in the electric current that active material generates, externally carries out High-current output.It follows that collector and active material
The superiority and inferiority of material contact situation is an important factor for influencing battery charge and discharge performance.
Existing lithium ion cell positive mainly uses aluminium foil as collector, makes in the pole piece of conventional lithium ion battery
In technique, active material slurry is directly coated at aluminium foil surface, realizes that active material is fixed on afflux by binder after drying
Body surface face, but the contact area between the metal collector and active material particle of rigidity is limited, and interface resistance is larger, causes battery
There is negative effect for the performance under the conditions of battery performance especially high current charge-discharge in the rising of internal resistance；And binder
Adhesion strength it is limited, in lasting charge and discharge process, it is easy to expanding to disengage between active material and collector occur, lead
The internal resistance of cell is caused further to increase, so that the cycle life and security performance of battery are affected.
It therefore need to be by adding the chemical property that functional coating improves lithium ion battery in aluminium foil surface.Carbon-coated aluminum foils are
Conductive carbon material is coated on aluminium foil, it can provide splendid static conductive performance, the micro-current of active material is collected, thus
The contact resistance between positive electrode and afflux can be greatly lowered, and adhesive ability between the two can be improved, can reduce
The usage amount of binder, and then generate the overall performance of battery and be obviously improved.
In collection liquid surface coating film, the selection of conductive material is undoubtedly most important link, common conductive carbon
Material mainly has carbon black, graphite, carbon nanotube etc., but these conductive material thermal conductivities are lower, and when use is unfavorable for battery heat dissipation,
And the dispersibility of these conductive carbon materials in water is poor, therefore while coating is difficult to make coating uniform, is fine and smooth coated in aluminium foil
On, reduce the bond strength of coating and aluminium foil and the stability of collector.
Summary of the invention
The present invention is made to overcome the conductive carbon material thermal conductivity in carbon-coated aluminum foils conductive coating in the prior art lower
Used time is unfavorable for battery heat dissipation, and dispersibility in water is poor, is difficult coating uniformly, the combination for reducing coating and aluminium foil is strong
The problem of stability of degree and collector, a kind of lithium ion battery carbon-coated aluminum foils are provided, improves conductive coating thermal conductivity, make to lead
Electric material can be evenly dispersed in solvent and binder, and coating can be uniformly coated on collector, improve coating and aluminium foil
Adhesion strength and collector stability.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of lithium ion battery carbon-coated aluminum foils, the coating of the conductive coating of carbon-coated aluminum foils include conductive agent, binder and solvent,
The conductive agent includes at least one of graphene and carbon black, carbon nanotube, layered conductive graphite.
Preferably, conductive agent quality accounts for the 20-40% of coating gross mass.
Preferably, binder includes polyacrylate, polyurethane, epoxy resin, polyacrylonitrile, butadiene-styrene rubber, carboxylic first
At least one of base sodium cellulosate, quality account for the 10-30% of coating gross mass.
Preferably, solvent includes at least one of water and dehydrated alcohol, quality accounts for the 40-60% of coating gross mass.
Preferably, further including dispersing agent, the dispersing agent includes polyvinylpyrrolidone and 2- hydroxyphosphonoacetic acid
At least one of (HPA), quality accounts for the 0.1-5% of coating gross mass.
It uses graphene as the conductive agent in conductive coating, conductive coating thermal conductivity with higher can be made, to mention
The heat dissipation performance of high battery.And dispersing agent appropriate is added in the coating of conductive coating, conductive agent can be made to be evenly dispersed in
In solvent and binder, is conducive to coating and is uniformly coated on aluminium foil surface, it can be in less conductive agent and consumption of binder
The stability of the lower adhesion strength for improving coating and aluminium foil and collector.
Preferably, carbon black and graphene pass through polyvinylpyrrolidone graft modification.Though dispersing agent is added in coating
The dispersion effect of conductive agent, but improved limitation can so be improved, and the dispersion stabilization of conductive agent is not high.It therefore will dispersion
Agent polyvinylpyrrolidone is grafted on conductive agent surface, and the hydrophobic group of dispersing agent is made firmly to be adsorbed on the surface of conductive agent, and close
It is water base to extend in water-based system, the surface free energy of conductive agent is reduced, steric hindrance is increased, the conductive agent after graft modification is certainly
Body is with dispersibility and has high dispersion stability.
Preferably, the preparation method of the carbon black of polyvinylpyrrolidone graft modification the following steps are included:
A) by carbon black dispersion in the nitration mixture of the concentrated sulfuric acid and 0.4-0.6mol/L dust technology that volume ratio is 2:1-3:1, ultrasound vibration
Swing simultaneously back flow reaction 1-2h；
B) it is washed repeatedly with deionized water after filtering to neutrality, 60-70 DEG C of vacuum drying 12-24h；
C) product after drying is dissolved in thionyl chloride, 2-3 drop n,N-Dimethylformamide is added dropwise, is reacted at 60-70 DEG C
24-48h；
D) products therefrom is dispersed in ethylene glycol, back flow reaction 24-48h at 100-120 DEG C；
E) by products therefrom and 4- dimethylamino pyridine, dicyclohexylcarbodiimide and CHCl3Mixing, sealing vacuumizes and nitrogen charging
The chloroformic solution of 2- carboxyl isopropyl acylbromide is injected after gas 2-3 times, continues to react 24- at room temperature after stirring 2-3h at 0-4 DEG C
48h；
F) acquired solution chloroform dilute filtration is dried in vacuo 6-12h at 40-50 DEG C after washing repeatedly；
G) by the product and pentamethyl-diethylenetriamine, pentamethyl-diethylenetriamines and N,N-dimethylformamide after drying
Mixing, sealing is vacuumized injects vinyl pyrrolidone with inflated with nitrogen 2-3 times afterwards, is stirred to react 24-48h at 70-80 DEG C；
H) acquired solution is diluted with dehydrated alcohol and is filtered, and is dried in vacuo 6-12h after washing repeatedly, is obtained polyvinylpyrrolidone and connect
The modified carbon black of branch.
By multi step modification method, first carbon black is handled by the concentrated sulfuric acid and dust technology, introduces carboxylic acid group on surface, then will
Resulting Carboxylation carbon black is reacted with thionyl chloride, obtains the carbon black of chloride, and the carbon black of chloride again and glycol reaction, obtains
The bromination charcoal reacted to the carbon black of surface hydroxylation, the carbon black of surface hydroxylation with bromide reagent 2- carboxyl isopropyl acylbromide
It is black, it can be used as the initiator of atom transition free radical polymerization reaction, utilize this atom transition free radical polymerization reaction initiator
Cause vinylpyrrolidone monomer polymerization, obtains the carbon black of polyvinylpyrrolidone graft modification.Carbon black after graft modification
It can be dispersed in water and alcohol solvent, and dispersion stabilization with higher.
Preferably, the preparation method of the graphene of polyvinylpyrrolidone graft modification the following steps are included:
A) deionized water is added in graphene oxide powder, ultrasonic disperse obtains the graphene oxide that concentration is 0.1-0.3mg/mL
Dispersion liquid；
B) in graphene oxide dispersion be added with graphene oxide mass ratio be 1:1-5:1 polyvinylpyrrolidone and with
Graphene oxide mass ratio is the ascorbic acid of 2:1-5:1, stirs 10-20min；
C) mixed system is heated to reaction 3-4h in 70-80 DEG C of oil bath；
D) it filters after reaction, polyvinylpyrrolidone graft modification can be obtained after filtration product deionized water is washed repeatedly
Graphene.
Graphene causes to lack the site in conjunction with foreign molecules and substance, therewith phase due to the shortage of surface functional group
Than containing a large amount of oxygen-containing surface functional groups, including epoxy group, hydroxyl and carboxyl with the graphene oxide that graphite can be prepared in batches
Deng providing active site for its functional modification.Therefore it is first reacted with graphene oxide with polyvinylpyrrolidone, polyethylene
Pyrrolidone molecule can form chemical bond with some active oxygen-containing functional groups of surface of graphene oxide, then use Vitamin C again
Graphene oxide of the acid reduction through polyvinylpyrrolidone covalent modification, obtains the graphene of polyvinylpyrrolidone grafting.
Therefore, the invention has the following beneficial effects:
(1) it uses graphene as the conductive agent in conductive coating, conductive coating thermal conductivity with higher can be made, to improve
The heat dissipation performance of battery；
(2) polyvinylpyrrolidone and/or 2- hydroxyphosphonoacetic acid dispersing agent are added in carbon-coated aluminum foils coating, makes conductive agent
It is evenly dispersed in solvent and binder, is conducive to coating and is uniformly coated on aluminium foil surface, it can be in less conductive agent
With the stability of the adhesion strength and collector of raising coating and aluminium foil under consumption of binder；
(3) polyvinylpyrrolidone is grafted on conductive agent surface, reduces the surface free energy of conductive agent, increase steric hindrance,
Conductive agent itself after making graft modification with dispersibility and has high dispersion stability.
Specific embodiment
The present invention will be further described With reference to embodiment.
Embodiment 1:
By conductive agent, binder, solvent and dispersing agent according to mass percent are as follows: graphene 5%, carbon nanotube 5%, stratiform is led
Electro-graphitic 30%, polyacrylate 7%, epoxy resin 5%, water 47%, HPA 1% are mixed, and pass through anilox roll after mixing evenly
It is printed on aluminium foil, obtains applying 1~3 μm of carbon layer single side of carbon-coated aluminum foils after dry at 60 DEG C.
Embodiment 2:
By conductive agent, binder, solvent and dispersing agent according to mass percent are as follows: graphene 18%, carbon nanotube 8%, stratiform
Electrically conductive graphite 4%, carbon black 10%, acrylate 7%, polyurethane 7%, water 45%, polyvinylpyrrolidone 1% mix, stirring
By obtaining the carbon-coated aluminum foils of 1~3 μm of carbon layer single side of painting after dry at 60 DEG C on anilox printing to aluminium foil after uniformly.
Embodiment 3:
By conductive agent, binder, solvent and dispersing agent according to mass percent are as follows: graphene 5%, carbon nanotube 5%, stratiform is led
Electro-graphitic 5%, carbon black 5%, butadiene-styrene rubber 7%, sodium carboxymethylcellulose 8%, water 50%, dehydrated alcohol 10%, HPA 5% are mixed
It closes, after mixing evenly by obtaining the painting of 1~3 μm of carbon layer single side of painting after dry at 60 DEG C on anilox printing to aluminium foil
Carbon aluminium foil.
Embodiment 4:
By conductive agent, binder, solvent and dispersing agent according to mass percent are as follows: graphene 10%, carbon nanotube 10%, poly- third
Olefin(e) acid ester 17%, epoxy resin 13%, water 49.9%, HPA 0.1% are mixed, and pass through anilox printing to aluminium foil after mixing evenly
On, obtain applying 1~3 μm of carbon layer single side of carbon-coated aluminum foils after dry at 60 DEG C.
Embodiment 5:
By conductive agent, binder, solvent and dispersing agent according to mass percent are as follows: graphene 15%, carbon nanotube 15%, carbon black
10%, polyacrylate 7%, epoxy resin 5%, water 47.9%, HPA 0.1% is mixed, after mixing evenly by reticulate pattern roll marks
It brushes on aluminium foil, obtains applying 1~3 μm of carbon layer single side of carbon-coated aluminum foils after dry at 60 DEG C.
Embodiment 6:
By carbon black dispersion in the nitration mixture of the concentrated sulfuric acid and 0.4mol/L dust technology that volume ratio is 3:1, supersonic oscillations simultaneously flow back
1h is reacted, acquired solution deionized water dilute filtration is simultaneously washed to neutrality repeatedly, 60 DEG C of vacuum drying 12h；After drying
Product is dissolved in excessive SOCl2In, 2 drop n,N-Dimethylformamide solvents are added dropwise, are reacted for 24 hours at 60 DEG C；By products therefrom point
It is dispersed in ethylene glycol, back flow reaction is for 24 hours at 100 DEG C.Take products therefrom 4.7g, 4- dimethylamino pyridine 0.3g, dicyclohexyl
Carbon imines 3g, CHCl3100mL is placed in the flask of 1000mL, after sealing is vacuumized with inflated with nitrogen 2 times, with syringe by 3.8g
2- carboxyl isopropyl acylbromide is dissolved in the solution injection of 50mL chloroform, continues to react at room temperature for 24 hours after stirring 2h at 0 DEG C, gained is molten
Liquid chloroform dilute filtration is dried in vacuo 6h at washing 5 times, 40 DEG C repeatedly.Weigh products therefrom 5g, pentamethyl-diethylenetriamine
0.72g, pentamethyl-diethylenetriamines 0.87g, solvent n,N-Dimethylformamide 50mL are fitted into 1000ml flask, sealing
And vacuumize with inflated with nitrogen 2 times, be then injected into 56g vinyl pyrrolidone, reacted under 70 DEG C of stirring conditions for 24 hours, reaction stops
Taking-up is diluted with dehydrated alcohol after only, is filtered, and is dried in vacuo 6h after washing 3 times repeatedly, is obtained Polyvinylpyrrolidone graft
Modified carbon black.
At room temperature, 5g graphene oxide powder is weighed, deionized water is added, it is 0.1mg/mL's that ultrasonic disperse, which obtains concentration,
Graphene oxide dispersion, weighs 5g polyvinylpyrrolidone and 10g ascorbic acid is added in graphene oxide dispersion, sufficiently
Stirring 10min is allowed to dissolve, and then mixed system is placed in oil bath and is heated to 70 DEG C, sufficiently reaction 3h, after reaction, will
Dark solution filtering, and after being washed with deionized 3 times, drying obtains the modified graphene of Polyvinylpyrrolidone graft.
By conductive agent, binder, solvent and dispersing agent according to mass percent are as follows: Polyvinylpyrrolidone graft is modified
Graphene 30%, the modified carbon black 10% of Polyvinylpyrrolidone graft, polyacrylate 7%, epoxy resin 5%, water
48% mixing, after mixing evenly by anilox printing to aluminium foil, obtaining applying 1~3 μ of carbon layer single side after dry at 60 DEG C
The carbon-coated aluminum foils of m.
Embodiment 7:
By carbon black dispersion in the nitration mixture of the concentrated sulfuric acid and 0.6mol/L dust technology that volume ratio is 2:1, supersonic oscillations simultaneously flow back
2h is reacted, acquired solution deionized water dilute filtration is simultaneously washed to neutrality repeatedly, and 70 DEG C of vacuum drying are for 24 hours；After drying
Product is dissolved in excessive SOCl2In, 3 drop n,N-Dimethylformamide solvents are added dropwise, react 48h at 70 DEG C；By products therefrom point
It is dispersed in ethylene glycol, the back flow reaction 48h at 120 DEG C.Take products therefrom 5g, 4- dimethylamino pyridine 0.5g, dicyclohexyl carbon
Imines 4g, CHCl3100mL is placed in the flask of 1000mL, after sealing is vacuumized with inflated with nitrogen 3 times, with syringe by 4g 2- carboxylic
Base isopropyl acylbromide is dissolved in the solution injection of 50mL chloroform, continues to react 48h at room temperature after stirring 3h at 4 DEG C, acquired solution is used
Chloroform dilute filtration is dried in vacuo 12h at washing 5 times, 50 DEG C repeatedly.Weigh products therefrom 5g, pentamethyl-diethylenetriamine
0.8g, pentamethyl-diethylenetriamines 0.8g, solvent n,N-Dimethylformamide 50mL are fitted into 1000ml flask, and sealing is simultaneously
Vacuumize with inflated with nitrogen 3 times, be then injected into 60g vinyl pyrrolidone, react 48h under 80 DEG C of stirring conditions, reaction stops
Taking-up is diluted with dehydrated alcohol afterwards, is filtered, and is dried in vacuo 12h after washing 3 times repeatedly, is obtained Polyvinylpyrrolidone graft and change
The carbon black of property.The modified carbon nanotube of Polyvinylpyrrolidone graft is made with same procedure again.
At room temperature, 5g graphene oxide powder is weighed, deionized water is added, it is 0.3mg/mL's that ultrasonic disperse, which obtains concentration,
Graphene oxide dispersion, weighs 25g polyvinylpyrrolidone and 25g ascorbic acid is added in graphene oxide dispersion, fills
Divide stirring 20min to be allowed to dissolve, then mixed system is placed in oil bath and is heated to 80 DEG C, sufficiently reaction 4h, after reaction,
Dark solution is filtered, and after being washed with deionized 3 times, drying obtains the modified graphite of Polyvinylpyrrolidone graft
Alkene.
By conductive agent, binder, solvent and dispersing agent according to mass percent are as follows: the stone of Polyvinylpyrrolidone graft
Black alkene 10%, the carbon black 10% of Polyvinylpyrrolidone graft, the carbon nanotube 10% of Polyvinylpyrrolidone graft are gathered
Acrylate 7%, epoxy resin 3%, water 59.9%, HPA 0.1% are mixed, and pass through anilox printing to aluminium foil after mixing evenly
On, obtain applying 1~3 μm of carbon layer single side of carbon-coated aluminum foils after dry at 60 DEG C.
Embodiment 8:
By carbon black dispersion in the nitration mixture of the concentrated sulfuric acid and 0.5mol/L dust technology that volume ratio is 2.5:1, supersonic oscillations are simultaneously returned
Stream reaction 1.5h, acquired solution deionized water dilute filtration are simultaneously washed to neutrality repeatedly, 65 DEG C of vacuum drying 20h；It will dry
Product afterwards is dissolved in excessive SOCl2In, 2 drop n,N-Dimethylformamide solvents are added dropwise, react 36h at 65 DEG C；Gained is produced
Object is dispersed in ethylene glycol, the back flow reaction 36h at 110 DEG C.Take products therefrom 4g, 4- dimethylamino pyridine 0.3g, two hexamethylenes
Base carbon imines 2g, CHCl3100mL is placed in the flask of 1000mL, after sealing is vacuumized with inflated with nitrogen 2 times, with syringe by 3g
2- carboxyl isopropyl acylbromide is dissolved in the solution injection of 50mL chloroform, continues to react 36h at room temperature after stirring 2.5h at 2 DEG C, gained
Solution chloroform dilute filtration is dried in vacuo 8h at washing 5 times, 45 DEG C repeatedly.Weigh products therefrom 5g, pentamethyl divinyl three
Amine 0.6g, pentamethyl-diethylenetriamines 0.9g, solvent n,N-Dimethylformamide 50mL are fitted into 1000ml flask, sealing
And vacuumize with inflated with nitrogen 2 times, be then injected into 50g vinyl pyrrolidone, 36h reacted under 75 DEG C of stirring conditions, reaction stops
Taking-up is diluted with dehydrated alcohol after only, is filtered, and is dried in vacuo 8h after washing 3 times repeatedly, is obtained Polyvinylpyrrolidone graft
Modified carbon black.The modified carbon nanotube of Polyvinylpyrrolidone graft is made with same procedure again.
At room temperature, 5g graphene oxide powder is weighed, deionized water is added, it is 0.25mg/mL that ultrasonic disperse, which obtains concentration,
Graphene oxide dispersion, weigh 15g polyvinylpyrrolidone and 15g ascorbic acid and be added in graphene oxide dispersion,
15min is sufficiently stirred to be allowed to dissolve, then mixed system is placed in oil bath and is heated to 75 DEG C, sufficiently reaction 3.5h, reaction knot
Shu Hou filters dark solution, and after being washed with deionized 3 times, and it is modified that drying obtains Polyvinylpyrrolidone graft
Graphene.
By conductive agent, binder, solvent and dispersing agent according to mass percent are as follows: the stone of Polyvinylpyrrolidone graft
Black alkene 15%, the carbon black 10% of Polyvinylpyrrolidone graft, the carbon nanotube 15% of Polyvinylpyrrolidone graft are gathered
Acrylate 10%, epoxy resin 8%, water 41%, HPA 1% are mixed, and are passed through on anilox printing to aluminium foil after mixing evenly,
Obtain applying 1~3 μm of carbon layer single side of carbon-coated aluminum foils at 60 DEG C after drying.
Comparative example 1:
It is not coated by the empty aluminium foil of conductive coating.
The slurry of LiFePO4 is coated on above-described embodiment and the aluminum foil material of comparative example production, being fabricated to surface density is
300g/m2, compacted density 2.1g/cm3Pole piece, test the cohesive force and impedance of pole piece.Then make 20Ah's with above-mentioned pole piece
Battery tests the internal resistance of battery, and the results are shown in Table 1.
Table 1: using pole piece cohesive force, impedance and the internal resistance of cell made of different coating
Claims (8)
1. a kind of lithium ion battery carbon-coated aluminum foils, characterized in that the coating of the conductive coating of the carbon-coated aluminum foils includes conduction
Agent, binder and solvent, the conductive agent include graphene and carbon black, carbon nanotube, at least one in layered conductive graphite
Kind.
2. a kind of lithium ion battery carbon-coated aluminum foils according to claim 1, characterized in that the conductive agent quality accounts for painting
Expect the 20-40% of gross mass.
3. a kind of lithium ion battery carbon-coated aluminum foils according to claim 1, characterized in that the binder includes poly- third
At least one of olefin(e) acid ester, polyurethane, epoxy resin, polyacrylonitrile, butadiene-styrene rubber, sodium carboxymethylcellulose, quality account for painting
Expect the 10-30% of gross mass.
4. a kind of lithium ion battery carbon-coated aluminum foils according to claim 1, characterized in that the solvent includes water and nothing
At least one of water-ethanol, quality account for the 40-60% of coating gross mass.
5. a kind of lithium ion battery carbon-coated aluminum foils according to claim 1, characterized in that it further include dispersing agent, it is described
Dispersing agent includes at least one of polyvinylpyrrolidone and 2- hydroxyphosphonoacetic acid, and quality accounts for the 0.1- of coating gross mass
5%。
6. a kind of lithium ion battery carbon-coated aluminum foils according to claim 1, characterized in that the carbon black and graphene warp
Cross polyvinylpyrrolidone graft modification.
7. a kind of lithium ion battery carbon-coated aluminum foils according to claim 6, characterized in that polyvinylpyrrolidone grafting
The preparation method of modified carbon black the following steps are included:
A) by carbon black dispersion in the nitration mixture of the concentrated sulfuric acid and 0.4-0.6mol/L dust technology that volume ratio is 2:1-3:1, ultrasound vibration
Swing simultaneously back flow reaction 1-2h；
B) it is washed repeatedly with deionized water after filtering to neutrality, 60-70 DEG C of vacuum drying 12-24h；
C) product after drying is dissolved in thionyl chloride, 2-3 drop n,N-Dimethylformamide is added dropwise, is reacted at 60-70 DEG C
24-48h；
D) products therefrom is dispersed in ethylene glycol, back flow reaction 24-48h at 100-120 DEG C；
E) by products therefrom and 4- dimethylamino pyridine, dicyclohexylcarbodiimide and CHCl3Mixing, sealing vacuumizes and nitrogen charging
The chloroformic solution of 2- carboxyl isopropyl acylbromide is injected after gas 2-3 times, continues to react 24- at room temperature after stirring 2-3h at 0-4 DEG C
48h；
F) acquired solution chloroform dilute filtration is dried in vacuo 6-12h at 40-50 DEG C after washing repeatedly；
G) by the product and pentamethyl-diethylenetriamine, pentamethyl-diethylenetriamines and N,N-dimethylformamide after drying
Mixing, sealing is vacuumized injects vinyl pyrrolidone with inflated with nitrogen 2-3 times afterwards, is stirred to react 24-48h at 70-80 DEG C；
H) acquired solution is diluted with dehydrated alcohol and is filtered, and is dried in vacuo 6-12h after washing repeatedly, is obtained polyvinylpyrrolidone and connect
The modified carbon black of branch.
8. a kind of lithium ion battery carbon-coated aluminum foils according to claim 6, characterized in that polyvinylpyrrolidone grafting
The preparation method of modified graphene the following steps are included:
A) deionized water is added in graphene oxide powder, ultrasonic disperse obtains the graphene oxide that concentration is 0.1-0.3mg/mL
Dispersion liquid；
B) in graphene oxide dispersion be added with graphene oxide mass ratio be 1:1-5:1 polyvinylpyrrolidone and with
Graphene oxide mass ratio is the ascorbic acid of 2:1-5:1, stirs 10-20min；
C) mixed system is heated to reaction 3-4h in 70-80 DEG C of oil bath；
D) it filters after reaction, polyvinylpyrrolidone graft modification can be obtained after filtration product deionized water is washed repeatedly
Graphene.
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| CN113285073A (en) * | 2021-05-18 | 2021-08-20 | 南通宇华新材料科技有限公司 | Carbon-coated foil with efficient conductive function |
| CN113437303A (en) * | 2021-06-22 | 2021-09-24 | 佛山市大为科技有限公司 | Conductive slurry for coating surface of modified lithium battery current collector and preparation method and application thereof |
| CN113437303B (en) * | 2021-06-22 | 2022-10-21 | 佛山市大为科技有限公司 | Conductive slurry for coating surface of modified lithium battery current collector and preparation method and application thereof |
| CN113422065A (en) * | 2021-06-25 | 2021-09-21 | 湖北亿纬动力有限公司 | Coated aluminum foil and preparation method and application thereof |
| CN114784280A (en) * | 2022-05-11 | 2022-07-22 | 浙江南都电源动力股份有限公司 | Composite primer conductive agent and preparation method and application thereof |
| CN115117366A (en) * | 2022-08-29 | 2022-09-27 | 天津凯普瑞特新能源科技有限公司 | Carbon-coated aluminum foil, manufacturing process thereof and lithium ion battery |
| 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 |
| CN117352738B (en) * | 2023-11-08 | 2024-03-15 | 丽岛新能源(安徽)有限公司 | Carbon-coated aluminum foil and preparation method thereof |
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