CN107331868A - A kind of coating fluid, its application method and battery pole piece - Google Patents
A kind of coating fluid, its application method and battery pole piece Download PDFInfo
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- CN107331868A CN107331868A CN201710537752.5A CN201710537752A CN107331868A CN 107331868 A CN107331868 A CN 107331868A CN 201710537752 A CN201710537752 A CN 201710537752A CN 107331868 A CN107331868 A CN 107331868A
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/60—Selection of substances as active materials, active masses, active liquids of organic compounds
- H01M4/602—Polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/137—Electrodes based on electro-active polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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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
Include component A and B component the invention provides a kind of coating fluid；Component A includes 5~40 parts by weight first polymers, 5~35 parts by weight second polymers, 0.1~5 the first crosslinking agent of parts by weight and 10~70 parts by weight water；The first polymer is the one or more in polyurethane and its derivative, polyvinyl alcohol and its derivative, phenolic resin, polyacrylamide and its derivative；Second polymer is the one or more of polyacrylic acid and its derivative, polysaccharide polymer, polyvinyl alcohol and its derivative, polyester, polyurethane and its derivative；The B component includes 0.01~5 the second crosslinking agent of parts by weight and 10~90 parts by weight water.Compared with prior art, the present invention is using the coating fluid of two kinds of components, and the method being crosslinked using two steps makes coat inside formation cross-linked transmission network, so as to get coating it is stronger for the adhesive attraction of metal, the stability of coating is improved, and also there is more preferable water-fast, solvent resistance.
Description
Technical field
The invention belongs to electrochemical technology field, more particularly to a kind of coating fluid, its application method and battery pole piece.
Background technology
In conventional electrochemical appliance, battery pole piece manufacture craft is that active material slurry is directly coated at into metal current collection
Body surface face, realizes that active material is fixed on collector surface after drying by binding agent.However, such structure design is present such as
Lower both sides defect：1) contact area between rigid metal current collector and active material particle is limited, and interface resistance is larger,
Cause the rising of the internal resistance of cell, there is negative effect for the performance of electrochemical appliance；2) adhesion strength of binding agent is limited,
In lasting charge and discharge process, it is easy to occur expanding to disengage between active material and collector, cause the internal resistance of cell further
Increase so that cycle life and the security performance of battery are affected.Therefore, the interface electricity between reduction collector and active material
Resistance, the adhesion strength improved between the two is the important means for lifting lithium secondary battery performance.Introduced on metal current collector surface
Conductive coating can effectively improve active material and the adhesion before metal current collector, reduce interface impedance, reduce electrolyte pair
The corrosion of metal current collector, is conducive to extending the service life of electrochemical appliance and improves its security.
The Chinese patent of Application No. 201180042480.2 discloses a kind of coating fluid for metal current collector, the painting
Cloth liquid contains conductive material, there is the derivative of polysaccharide and polysaccharide, separately contains organic acid and its derivative.The derivative is coated on gold
After metal surface, cross-linked coating is formed by the condensation reaction between polysaccharide and organic acid, so as to realize conductive coating in metal watch
The fixation in face.
Application No. CN00814654.3 Chinese patent discloses a kind of coating machine for coating metal surfaces, the coating
Agent contains conductive material, the binding agent of high temperature curable and other auxiliary substances, and it utilizes polyurethane/acrylate copolymerization
Thing, polyurethane/makrolon dispersion, polyurethane/polyester dispersion and acrylate copolymer dispersion agent its mixture exist
The solidification of conductive coating is realized in crosslinking under high temperature.
But above two method realizes the solidification of conductive coating using one-step method, curing efficiency is relatively low, and conductive coating is steady
Qualitative poor, the interaction between collector is also weaker, and on the one hand these shortcomings can influence the electric conductivity of modified collector
Can, the stability on the other hand also influenceing it to be used for a long time.
The content of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of coating fluid, its application method and battery pole
Piece, the coating fluid improves the stability of conductive coating.
The invention provides a kind of coating fluid, including component A and B component；
The component A includes：The first polymer of 5~40 parts by weight, the second polymer of 5~35 parts by weight, 0.1~5
First crosslinking agent of parts by weight and the water of 10~70 parts by weight；The first polymer is selected from polyurethane and its derivative, poly- second
One or more in enol and its derivative, phenolic resin, polyacrylamide and its derivative；The second polymer is selected from
Polyacrylic acid and its derivative, polysaccharide polymer, polyvinyl alcohol and its derivative, polyester, the one of polyurethane and its derivative
Plant or a variety of；
The B component includes：Second crosslinking agent of 0.01~5 parts by weight and the water of 10~90 parts by weight.
It is preferred that, first polymer, second polymer and the total amount of the first crosslinking agent are in component A in the component A
Mass fraction is less than or equal to 40%.
It is preferred that, first crosslinking agent is selected from aldehyde crosslinking agent and/or anhydrides crosslinking agent.
It is preferred that, second crosslinking agent is selected from aldehyde crosslinking agent, the polynuclear hydroxy bridge complex ion and Phenolic crosslinkers of metal
In one or more.
It is preferred that, one or more of the aldehyde crosslinking agent in formaldehyde, glyoxal, glutaraldehyde and ureaformaldehyde；It is described
The polynuclear hydroxy bridge complex ion of metal is selected from the polynuclear hydroxy bridge complex ion of zirconium and/or the polynuclear hydroxy bridge complex ion of chromium；The phenols is handed over
Join agent and be selected from phenol and/or resorcinol.
It is preferred that, the component A also includes the conductive material of 20~50 parts by weight.
Present invention also offers a kind of application method of coating fluid, comprise the following steps：
S1 component A) is coated on metal surface, the metal after being coated with；
S2) metal after the coating is impregnated in B component, water-bath is then carried out, obtaining surface attachment after drying has
The metal of coating；
The component A includes：The first polymer of 5~40 parts by weight, the second polymer of 5~35 parts by weight, 0.1~5
First crosslinking agent of parts by weight and the water of 10~70 parts by weight；The first polymer is selected from polyurethane and its derivative, poly- second
One or more in enol and its derivative, phenolic resin, polyacrylamide and its derivative；The second polymer is selected from
Polyacrylic acid and its derivative, polysaccharide polymer, polyvinyl alcohol and its derivative, polyester, the one of polyurethane and its derivative
Plant or a variety of；
The B component includes：Second crosslinking agent of 0.01~5 parts by weight and the water of 10~90 parts by weight.
It is preferred that, the step S2) in B component temperature be 100 DEG C~150 DEG C；The temperature of the drying be 50 DEG C~
150℃。
Present invention also offers a kind of battery pole piece, including collector and the active material layer for being attached to collector surface；
The active material layer is formed by above-mentioned coating fluid.
Present invention also offers a kind of electrochemical element, including above-mentioned electrode plates.
Include component A and B component the invention provides a kind of coating fluid；The component A includes：The of 5~40 parts by weight
One polymer, the second polymer of 5~35 parts by weight, the water of the first crosslinking agent of 0.1~5 parts by weight and 10~70 parts by weight；
The first polymer be selected from polyurethane and its derivative, polyvinyl alcohol and its derivative, phenolic resin, polyacrylamide and its
One or more in derivative；The second polymer is selected from polyacrylic acid and its derivative, polysaccharide polymer, polyethylene
Alcohol and its derivative, polyester, the one or more of polyurethane and its derivative；The B component includes：0.01~5 parts by weight
The water of second crosslinking agent and 10~90 parts by weight.Compared with prior art, the present invention uses the coating fluid of two kinds of components, using two
Step crosslinking method make coat inside formation cross-linked transmission network, so as to get coating it is stronger for the adhesive attraction of metal, carry
The high stability of coating, and also make coating that there is more preferable water-fast, solvent-proof performance by cross-linked transmission network.
Brief description of the drawings
Fig. 1 is the cated aluminium foil of attachment obtained in the embodiment of the present invention 1 and the crosslinking internal drag curve figure of normal aluminium foil；
Fig. 2 is the cated aluminium foil of attachment obtained in the embodiment of the present invention 1 and the multiplying power charge graph of normal aluminium foil.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of protection of the invention.
The invention provides a kind of coating fluid, including component A and B component；The component A includes：The of 5~40 parts by weight
One polymer, the second polymer of 5~35 parts by weight, the water of the first crosslinking agent of 0.1~5 parts by weight and 10~70 parts by weight；
The first polymer be selected from polyurethane and its derivative, polyvinyl alcohol and its derivative, phenolic resin, polyacrylamide and its
One or more in derivative；The second polymer is selected from polyacrylic acid and its derivative, polysaccharide polymer, polyethylene
Alcohol and its derivative, polyester, the one or more of polyurethane and its derivative；The B component includes：0.01~5 parts by weight
The water of second crosslinking agent and 10~90 parts by weight.
Wherein, the present invention is not particularly limited to the source of all raw materials, is commercially available.
According to the present invention, the content of first polymer is preferably 4~35 parts by weight in the component A；In present invention offer
Some embodiments in, the content of the first polymer is preferably 5 parts by weight；In some embodiments that the present invention is provided,
The content of the first polymer is preferably 28 parts by weight；In other embodiments that the present invention is provided, first polymerization
The content of thing is preferably 35 parts by weight；The first polymer is polyurethane and its derivative, polyvinyl alcohol and its derivative, phenol
One or more in urea formaldehyde, polyacrylamide and its derivative, preferably polyurethane and its derivative.
The content of the second polymer is preferably 5~30 parts by weight, more preferably 8~25 parts by weight；Carried in the present invention
In some embodiments supplied, the content of the second polymer is preferably 25 parts by weight；Some embodiments provided in the present invention
In, the content of the second polymer is preferably 10 parts by weight；In other embodiments that the present invention is provided, described second gathers
The content of compound is preferably 8 parts by weight；The second polymer is polyacrylic acid and its derivative, polysaccharide polymer, poly- second
Enol and its derivative, polyester, the one or more of polyurethane and its derivative, preferably polysaccharide polymer, more preferably
Chitin.
The content of first crosslinking agent is preferably 0.5~5 parts by weight, more preferably 1~5 parts by weight, further preferably for 2~
4 parts by weight, most preferably 2~3 parts by weight；First crosslinking agent is crosslinking agent well known to those skilled in the art, and
It is preferably aldehyde crosslinking agent and/or anhydrides crosslinking agent in the present invention without special limitation；The aldehyde crosslinking agent is this area
Aldehyde crosslinking agent known to technical staff, it is preferably formaldehyde, glyoxal, glutaraldehyde to have no in special limitation, the present invention
With the one or more in ureaformaldehyde；The anhydrides crosslinking agent is anhydrides crosslinking agent well known to those skilled in the art,
It is preferably phthalic anhydride to have no in special limitation, the present invention.
According to the present invention, the first polymer described in component A, second polymer and the total mass fraction of the first crosslinking agent
Preferably smaller than it is equal to 40%, more preferably 10%~40%, is further preferably 20%~40%, most preferably 20%~30%；
In some embodiments that the present invention is provided, the first polymer described in component A, second polymer and total matter of the first crosslinking agent
It is preferably 20% to measure fraction；In some embodiments that the present invention is provided, the first polymer described in component A, the second polymerization
The total mass fraction of thing and the first crosslinking agent is preferably 25.5%；In other embodiments that the present invention is provided, in component A
The total mass fraction of the first polymer, second polymer and the first crosslinking agent is preferably 30.4%.
The content of the component A reclaimed water is preferably 20~70 parts by weight, more preferably 40~70 parts by weight, is further preferably 50
~70 parts by weight.
According to the present invention, preferably also include the conductive material of 20~50 parts by weight in the component A, more preferably also include 30
The conductive material of~50 parts by weight, further preferably also includes the conductive material of 40~50 parts by weight, most preferably also includes 45~50 weights
Measure the conductive material of part；The conductive material is conductive material well known to those skilled in the art, has no special limitation,
It is preferably conductive carbon material and/or metal dust in the present invention；The conductive carbon material is known for those skilled in the art
Conductive carbon material, have no special limitation, be preferably acetylene black, Ketjen black, carbon filament, carbon nanometer in the present invention
One or more in pipe, carbon nano-fiber and graphite；The metal dust is preferably one in gold, silver, copper, nickel and aluminium powder
Plant or a variety of.
Preferably also include the auxiliary agent of 0.1~10 parts by weight in the component A, more preferably also include helping for 1~10 parts by weight
Agent, further preferably also includes the auxiliary agent of 1~8 parts by weight, most preferably also includes the auxiliary agent of 2~5 parts by weight；The auxiliary agent is this area
Auxiliary agent known to technical staff, has no preferable organic solvent, thickener, tackifier and stream in special limitation, the present invention
One or more in dynamic agent；The organic solvent is organic solvent well known to those skilled in the art, and it is special to have no
It is preferably alcoholic solvent and/or 1-METHYLPYRROLIDONE, more preferably C1~C4 alcoholic solvent and/or N- first in limitation, the present invention
Base pyrrolidones；The thickener is thickener well known to those skilled in the art, is had no in special limitation, the present invention
Preferably sodium carboxymethylcellulose；The tackifier are tackifier well known to those skilled in the art, have no special limit
It is preferably polyacrylate in system, the present invention；The flowable is flowable well known to those skilled in the art, has no spy
It is preferably silanes flowable and/or type siloxane flowing collection, more preferably trimethoxy methyl silicon in different limitation, the present invention
Alkane, trimethoxysilane, n-octytriethoxysilane, 3- aminopropyl trimethoxysilanes, the ethoxy of 2- aminopropyls three
Base silane, 3- aminopropyltriethoxies diethoxy silane, N- (2- aminoethyls) -3- aminopropyl trimethoxysilanes, the oxygen of 3- epoxies third
Propyl trimethoxy silicane and the one or more in β (3,4- epoxycyclohexyls) ethyl triethoxysilane.
The B component includes the second crosslinking agent of 0.01~5 parts by weight and the water of 10~90 parts by weight；Wherein, described
The content of two crosslinking agents is preferably 1~5 parts by weight, more preferably 2~5 parts by weight；In some embodiments that the present invention is provided,
The content of the second crosslinking agent is preferably 4 parts by weight in the B component；In some embodiments that the present invention is provided, the B component
In the content of the second crosslinking agent be preferably 2 parts by weight；In other embodiments that the present invention is provided, second in the B component
The content of crosslinking agent is preferably 5 parts by weight；Second crosslinking agent is crosslinking agent well known to those skilled in the art, is had no
It is preferably one kind in aldehyde crosslinking agent, the polynuclear hydroxy bridge complex ion and Phenolic crosslinkers of metal in special limitation, the present invention
Or it is a variety of；The aldehyde crosslinking agent is preferably the one or more in formaldehyde, glyoxal, glutaraldehyde and ureaformaldehyde；The metal
Polynuclear hydroxy bridge complex ion is preferably the polynuclear hydroxy bridge complex ion of zirconium and/or the polynuclear hydroxy bridge complex ion of chromium；The Phenolic crosslinkers
Preferably phenol and/or resorcinol；The content of the water is preferably 10~60 parts by weight, more preferably 20~50 parts by weight,
It is further preferably 30~40 parts by weight.
The present invention makes coat inside formation cross-linked transmission net using the coating fluid of two kinds of components using the method for two steps crosslinking
Network, so as to get coating it is stronger for the adhesive attraction of metal, improve the stability of coating, and by cross-linked transmission network
Also make coating that there is more preferable water-fast, solvent-proof performance.
Present invention also offers a kind of application method of above-mentioned coating fluid, comprise the following steps：
S1 component A) is coated on metal surface, the metal after being coated with；
S2) metal after the coating is impregnated in B component, water-bath is then carried out, obtaining surface attachment after drying has
The metal of coating；
The component A includes：The first polymer of 5~40 parts by weight, the second polymer of 5~35 parts by weight, 0.1~5
First crosslinking agent of parts by weight and the water of 10~70 parts by weight；The first polymer is selected from polyurethane and its derivative, poly- second
One or more in enol and its derivative, phenolic resin, polyacrylamide and its derivative；The second polymer is selected from
Polyacrylic acid and its derivative, polysaccharide polymer, polyvinyl alcohol and its derivative, polyester, the one of polyurethane and its derivative
Plant or a variety of；
The B component includes：Second crosslinking agent of 0.01~5 parts by weight and the water of 10~90 parts by weight.
Wherein, the component A is same as above with B component, will not be repeated here.
According to the present invention, preferably first metallized metal is pre-processed；The preprocess method of the metal is people in the art
Method known to member, it is preferably to be carried out using the acid solution or aqueous slkali of low concentration to have no in special limitation, the present invention
Cleaning, is then rinsed with water or acetone again；The concentration of the acid solution or aqueous slkali is preferably 1%~10%, more preferably
It is further preferably 3%~6% for 2%~8%, most preferably 5%.
Then component A is coated on pretreated metal surface, the metal after being coated with；The method of the coating is
Method well known to those skilled in the art, has no and roller traction is preferably used in special limitation, the present invention, by coating fluid
Pretreated metal surface is coated on, by coating solution in pretreated metal more preferably by the way of intaglio printing
Surface, and using the thickness of intaglio plate anilox roll control coating；The thickness of the coating of metal after the coating is preferably 20nm~5
μm, more preferably 50nm~3 μm are further preferably 100nm~2 μm, are further preferably 200nm~500nm.
Metal after the coating is impregnated in B component；The temperature of the B component is preferably 100 DEG C~150 DEG C, more
Preferably 110 DEG C~140 DEG C, be further preferably 120 DEG C~140 DEG C, most preferably 130 DEG C~135 DEG C；The time of the dipping is excellent
Elect 2~60s, more preferably 10~50s as, be further preferably 20~30s；In the present invention preferably by the metal after coating through roller
It is pulled into B component；The speed of the traction is preferably 2~150m/min, more preferably 5~150m/min, further preferably for
50~150m/min, is further preferably 50~100m/min, is further preferably 80~100m/min.
After dipping, water-bath is carried out；The time of the water-bath is preferably 2~60s, more preferably 30~60s；In the present invention
In, preferably it is pulled into water-bath through roller；The speed of the traction is preferably 2~150m/min, more preferably 5~150m/
Min, is further preferably 50~150m/min, is further preferably 50~100m/min, is further preferably 80~100m/min.In the process
Occurs the cross-linking reaction of first polymer.
It is dried after water-bath；The temperature of the drying is preferably 50 DEG C~150 DEG C, more preferably 80 DEG C~150 DEG C, then
Preferably 100 DEG C~150 DEG C, most preferably 120 DEG C~140 DEG C；The time of the drying is preferably 10~180s.In this process
In can remove aqueous solvent, while occurring the crosslinking of first polymer and second polymer, form crosslinked polymer network.
The coating fluid and coating method, which can be used for being modified collector, prepares battery pole piece, it may also be used for metallic film product table
The modification in face, the anti-corrosion such as set for the metal in terms of marine field.
The present invention realizes the solidification of coating using two-step method, makes the first crosslinking curing of a portion component by the first step,
Then gone out moisture by subsequent heat process, and coating is further cross-linked to form cross-linked transmission network.It is crosslinked using two steps
Method make coat inside formation cross-linked transmission network so that the adhesive attraction between making obtained coating and metal is stronger, carry
The high stability of coating, while also making coating that there is more preferable water-fast, solvent-proof performance by cross-linked transmission network.
Present invention also offers a kind of battery pole piece, including collector and the active material layer for being attached to collector surface；
The active material layer is formed by above-mentioned coating fluid；The active material layer can be attached to the one or both sides of collector, have no
Special limitation.
The battery pole piece that the present invention is provided has higher electronic conductivity, and this is to ensure that it is good in electrochemical appliance
The important foundation used.
Present invention also offers a kind of electrochemical element, including above-mentioned battery pole piece.
Present invention also offers a kind of electric power system, including above-mentioned electrochemical element.
In order to further illustrate the present invention, with reference to embodiments to a kind of coating fluid of the invention provided, its user
Method and battery pole piece are described in detail.
Reagent used is commercially available in following examples.
Embodiment 1
The preparation of 1.1 coating fluids：
It is well mixed in the aqueous solvent that the sodium carboxymethylcellulose of 2 parts by weight is added to 60 parts by weight, then again by 5 weight
The first polymer polyacrylamide, the second polymer chitin of 25 parts by weight, the adjacent benzene two of the second crosslinking agent of 2 parts by weight of part
Formic anhydride is added in above-mentioned solution and is well mixed, and is eventually adding the electrical-conductive nanometer graphite of 45 parts by weight, carries out high speed dispersion mixing,
Obtain component A；
The the first crosslinking agent glyoxal and 30 parts by weight solvent water of 4 parts by weight are mixed, B component is obtained.
The pretreatment of 1.2 metallic films：Aluminium foil is cleaned using the hydrochloric acid solution of 5wt% concentration first, then
Rinsed using solvent deionized water, processing is dried at a temperature of being then placed in 150 DEG C again, to remove aluminium foil surface impurity, made
Aluminium foil surface forms uniform texturing layer.
1.3 use roller with 80 ms/min of speed drawing aluminium foils, are uniformly applied coating fluid by the way of intaglio printing
The aluminium foil surface of pretreatment is distributed in, and using intaglio plate anilox roll control control coating layer thickness, coating layer thickness is controlled at 1 μm.
Aluminium foil after coating is pulled into B component by 1.4 through roller, and temperature is 130 DEG C, and hauling speed is：100 ms/min
Clock, B component was gone out after 30 seconds.
Aluminium foil after 1.5 coatings is directly entered water-bath after being come out from B component.Hauling speed is with being above consistent, water
1 minute bath time.
1.6 from water-bath come out after enter high temperature baking zone, high temperature baking zone temperature be 140 DEG C, 1 minute time, drying
The cated aluminium foil winding of attachment after the completion of polymerization is stand-by.
Coating fluid uses four probe test electrical conductivity for 23.6S/cm after drying on a pet film.
It will be obtained in embodiment 1 after being soaked 30 days in 1-METHYLPYRROLIDONE and electrolyte, coating does not occur any
The phenomenon such as come off, bubble.
The cated aluminium foil of the attachment obtained in embodiment 1 is assembled into lithium ion battery, battery performance is tested, obtains it
AC internal Resistance curve map, as shown in figure 1, from the results, it was seen that compared to normal aluminium foil, the internal resistance of cell is reduced to by 6.6m Ω
3.7mΩ；Obtain its multiplying power charge graph, as shown in Fig. 2 lifted after multiplying power charging performance 2.5C multiplying powers up to 100% with
On.
Embodiment 2
The preparation of 2.1 coating fluids：
The sodium carboxymethylcellulose of 5 parts by weight is added in 70 parts by weight solvent water and is well mixed, then again by 28 weight
The first polymer polyacrylamide, the second polymer chitin of 10 parts by weight, the adjacent benzene two of the second crosslinking agent of 3 parts by weight of part
Formic anhydride is added in above-mentioned solution and is well mixed, and the mass ratio for being eventually adding 45 parts by weight is 2:1 conductive carbon black and nanometer stone
Ink, carries out high speed dispersion mixing, obtains component A；
The the first crosslinking agent glyoxal and 30 parts by weight solvent water of 2 parts by weight are mixed, B component is obtained.
The pretreatment of 2.2 metallic films：Aluminium foil is cleaned using the hydrochloric acid solution of 5wt% concentration first, then
Rinsed using solvent deionized water, processing is dried at a temperature of being then placed in 150 DEG C again, to remove aluminium foil surface impurity, made
Aluminium foil surface forms uniform texturing layer.
2.3 use roller with 150 ms/min of speed drawing aluminium foils, by the way of intaglio printing that coating fluid is uniform
The aluminium foil surface of pretreatment is coated on, and using intaglio plate anilox roll control control coating layer thickness, coating layer thickness is controlled in 500nm.
Aluminium foil after coating is pulled into B component by 2.4 through roller, and temperature is 135 DEG C, and hauling speed is：150 ms/min
Clock, B component was gone out after 10 seconds.
Aluminium foil after 2.5 coatings is directly entered water-bath after being come out from B component.Hauling speed is with being above consistent, water
The bath time is 30 seconds.
2.6 from water-bath come out after enter high temperature baking zone, high temperature baking zone temperature be 120 DEG C, 1 minute time, drying
The cated aluminium foil winding of attachment after the completion of polymerization is stand-by.
Coating fluid uses four probe test electrical conductivity for 12.5S/cm after drying on a pet film.
It will adhere in embodiment 2 after cated aluminium foil soaks 30 days in 1-METHYLPYRROLIDONE and electrolyte, coating
Any phenomenon such as come off, bubble does not occur.
Embodiment 3
The preparation of 3.1 coating fluids：
The carboxymethyl cellulose of 3 parts by weight is calculated to add in 60 parts by weight solvent water and is well mixed, then again by 35 parts by weight
First polymer polyacrylamide, the second polymer chitin of 8 parts by weight, the second crosslinking agent O-phthalic of 2 parts by weight
Acid anhydrides is added in above-mentioned solution and is well mixed, and the mass ratio for being eventually adding 50 parts by weight is 3:1 nano-graphite and CNT,
High speed dispersion mixing is carried out, component A is obtained；
The the first crosslinking agent glyoxal and 40 parts by weight solvent water of 5 parts by weight are mixed, B component is obtained.
The pretreatment of 3.2 metallic films：Copper foil is cleaned using the sulfuric acid solution of 5wt% concentration first, then
Rinsed using solvent deionized water, processing is dried at a temperature of being then placed in 120 DEG C again, to remove copper foil surface impurity, made
Copper foil surface forms uniform texturing layer.
3.3 use roller with 60 ms/min of speed drawing copper foils, are uniformly applied coating fluid by the way of intaglio printing
Be distributed in the copper foil surface of pretreatment, and using intaglio plate anilox roll control control coating layer thickness, coating layer thickness control 1 μm (.
Copper foil after coating is pulled into B component by 3.4 through roller, and temperature is 130 DEG C, and hauling speed is：30 ms/min
Clock, B component was gone out after 1 minute.
3.5 the copper foil after coating is directly entered water-bath after being come out from B component.Hauling speed is with being above consistent, water
1 minute bath time.
3.6 from water-bath come out after enter high temperature baking zone, high temperature baking zone temperature be 120 DEG C, the time be 2 minutes, dry
The cated copper foil winding of attachment after the completion of dry polymerization is stand-by.
Coating fluid uses four probe test electrical conductivity for 36.2S/cm after drying on a pet film.
It will adhere to after cated copper foil soaks 30 days in 1-METHYLPYRROLIDONE and electrolyte, coating does not occur any
The phenomenon such as come off, bubble.
Claims (10)
1. a kind of coating fluid, it is characterised in that including component A and B component；
The component A includes：The first polymer of 5~40 parts by weight, the second polymer of 5~35 parts by weight, 0.1~5 weight
First crosslinking agent of part and the water of 10~70 parts by weight；The first polymer is selected from polyurethane and its derivative, polyvinyl alcohol
And its one or more in derivative, phenolic resin, polyacrylamide and its derivative；The second polymer is selected from poly- third
Olefin(e) acid and its derivative, polysaccharide polymer, polyvinyl alcohol and its derivative, polyester, one kind of polyurethane and its derivative or
It is a variety of；
The B component includes：Second crosslinking agent of 0.01~5 parts by weight and the water of 10~90 parts by weight.
2. coating fluid according to claim 1, it is characterised in that in the component A first polymer, second polymer with
Mass fraction of the total amount of first crosslinking agent in component A is less than or equal to 40%.
3. coating fluid according to claim 1, it is characterised in that first crosslinking agent be selected from aldehyde crosslinking agent and/or
Anhydrides crosslinking agent.
4. coating fluid according to claim 1, it is characterised in that second crosslinking agent is selected from aldehyde crosslinking agent, metal
Polynuclear hydroxy bridge complex ion and Phenolic crosslinkers in one or more.
5. coating fluid according to claim 4, it is characterised in that the aldehyde crosslinking agent is selected from formaldehyde, glyoxal, penta 2
Aldehyde and the one or more in ureaformaldehyde；The polynuclear hydroxy bridge complex ion of the metal is selected from the polynuclear hydroxy bridge complex ion and/or chromium of zirconium
Polynuclear hydroxy bridge complex ion；The Phenolic crosslinkers are selected from phenol and/or resorcinol.
6. coating fluid according to claim 1, it is characterised in that the component A also includes the conduction of 20~50 parts by weight
Material.
7. a kind of application method of coating fluid, it is characterised in that comprise the following steps：
S1 component A) is coated on metal surface, the metal after being coated with；
S2) metal after the coating is impregnated in B component, water-bath is then carried out, obtaining surface attachment after drying has coating
Metal；
The component A includes：The first polymer of 5~40 parts by weight, the second polymer of 5~35 parts by weight, 0.1~5 weight
First crosslinking agent of part and the water of 10~70 parts by weight；The first polymer is selected from polyurethane and its derivative, polyvinyl alcohol
And its one or more in derivative, phenolic resin, polyacrylamide and its derivative；The second polymer is selected from poly- third
Olefin(e) acid and its derivative, polysaccharide polymer, polyvinyl alcohol and its derivative, polyester, one kind of polyurethane and its derivative or
It is a variety of；
The B component includes：Second crosslinking agent of 0.01~5 parts by weight and the water of 10~90 parts by weight.
8. application method according to claim 7, it is characterised in that the step S2) in the temperature of B component be 100 DEG C
~150 DEG C；The temperature of the drying is 50 DEG C~150 DEG C.
9. a kind of battery pole piece, it is characterised in that including collector and the active material layer for being attached to collector surface；The work
Property material layer is formed as the coating fluid described in claim 1~6 any one.
10. a kind of electrochemical element, it is characterised in that including the electrode plates described in claim 9.
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| CN201710537752.5A CN107331868A (en) | 2017-07-04 | 2017-07-04 | A kind of coating fluid, its application method and battery pole piece |
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Cited By (1)
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