CN109332087A - A kind of lithium ion battery separator and preparation method thereof and apparatus for coating - Google Patents
A kind of lithium ion battery separator and preparation method thereof and apparatus for coating Download PDFInfo
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- CN109332087A CN109332087A CN201810966414.8A CN201810966414A CN109332087A CN 109332087 A CN109332087 A CN 109332087A CN 201810966414 A CN201810966414 A CN 201810966414A CN 109332087 A CN109332087 A CN 109332087A
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- coating
- baking oven
- coating head
- lithium ion
- ion battery
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- 238000000576 coating method Methods 0.000 title claims abstract description 182
- 239000011248 coating agent Substances 0.000 title claims abstract description 176
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 239000000725 suspension Substances 0.000 claims abstract description 69
- 210000002469 basement membrane Anatomy 0.000 claims abstract description 43
- 238000001035 drying Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000002834 transmittance Methods 0.000 claims abstract description 3
- 229920000642 polymer Polymers 0.000 claims description 31
- 239000006255 coating slurry Substances 0.000 claims description 20
- 239000011230 binding agent Substances 0.000 claims description 19
- 239000002002 slurry Substances 0.000 claims description 17
- 238000005507 spraying Methods 0.000 claims description 17
- -1 polypropylene Polymers 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000002562 thickening agent Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 12
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 210000004379 membrane Anatomy 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 9
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 238000007761 roller coating Methods 0.000 claims description 7
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 6
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- 238000009498 subcoating Methods 0.000 claims description 6
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- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 229920002125 Sokalan® Polymers 0.000 claims description 4
- 239000002174 Styrene-butadiene Substances 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 4
- 239000004584 polyacrylic acid Substances 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 claims description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 239000000806 elastomer Substances 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- 239000004816 latex Substances 0.000 claims description 3
- 229920000126 latex Polymers 0.000 claims description 3
- 229920000609 methyl cellulose Polymers 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- 239000011115 styrene butadiene Substances 0.000 claims description 3
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 3
- 229920002397 thermoplastic olefin Polymers 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 2
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 2
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 150000003440 styrenes Chemical class 0.000 claims description 2
- 239000002552 dosage form Substances 0.000 claims 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 claims 1
- 230000009977 dual effect Effects 0.000 abstract description 13
- 238000000465 moulding Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005213 imbibition Methods 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010422 painting Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000000643 oven drying Methods 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000009193 crawling Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 150000002085 enols Chemical class 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 229920001992 poloxamer 407 Polymers 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/027—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Abstract
The present invention provides a kind of lithium ion battery separator and preparation method thereof and apparatus for coating, the apparatus for coating include slewing rollers, the first coating head, the second coating head and suspension baking oven；First coating head and the second coating head are distributed in the two sides of basement membrane, for the first face and the second face of basement membrane to be respectively coated；The back segment of suspension baking oven is equipped with live-roller；After basement membrane is put by let off roll, it is transferred to suspension baking oven by slewing rollers, the first face of basement membrane is coated in transmittance process by the first coating head, by the second face of the second coating head coating basement membrane, forms the diaphragm of dual coating；After diaphragm enters the suspension baking oven, suspension drying is first carried out, then dried under live-roller support.The present invention realizes primary coating molding using the mode of " dual coating-baking oven baking ", guarantee the two-sided consistency of diaphragm, promote coating homogeneity, precision and quality, reduces failure area, the imbibition liquid-keeping property of diaphragm is improved, to reduce short circuit caused by film surface defect, breaking problem.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly to a kind of lithium ion battery separator and preparation method thereof
And apparatus for coating.
Background technique
With the development of science and technology and the raising of the people's material and cultural life level, people get over the demand of battery
Come bigger, the requirement to the performance of battery is also higher and higher.The demand of development and military equipment in particular with space technology,
A large amount of industrial, civilian, portable medical electronic product appearances brought by the fast development of information and microelectronics industry, electricity
The development and exploitation of electrical automobile and the enhancing of environmental protection consciousness, people are to small in size, and light-weight, high-energy safely may be used
It leans on, pollution-free, the demand for the battery used that can charge repeatedly is more urgent.Lithium ion battery is exactly to send out rapidly under this form
The novel high-energy secondary cell that exhibition is got up.
In the structure of lithium battery, diaphragm is crucial one of interior layer assembly.The performance of diaphragm determines the interface of battery
Structure, internal resistance etc. directly affect the characteristics such as capacity, circulation and the security performance of battery, and the diaphragm haveing excellent performance is electric to improving
The comprehensive performance in pond plays an important role.
Now, the main reason for being coated into influence diaphragm production capacity of lithium battery diaphragm, coating process directly affects
The properties of diaphragm, especially surface property.Domestic coating equipment generally most can reach 25 meters per minute fastly, once speed
Reach the 30 meters per minute uniformities that will seriously affect coating, efficiency is extremely low.Although dual coating had corresponding technique with
Special equipment occurs, but common dual coating equipment is still first to apply single side based on single side coating and then cross bellows, then apply another
Bellows are then crossed in face, but the efficiency of this coating method is still low, are no different with traditional single side coating, improvement is only
Reduce Operating Complexity, the time-consuming promotion that matter is still difficult to efficiency.
In addition, in mature blank preparation technics, nearly all coating sizing-agent used during the preparation process largely at
This is higher, seriously polluted, with strong corrosive, be more toxic or influence the organic solvent of function of human body, brought to environment larger
Burden, and cost is larger, also results in certain threat for production safety.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of lithium ion battery separator and its
Preparation method and apparatus for coating, for solving " single side coating-baking oven drying-single side coating-baking oven drying " in the prior art
Dual coating mode is there are film surface crawling, the problems such as coating accuracy is low, and film surface is of poor quality.
In order to achieve the above objects and other related objects, the present invention provides a kind of lithium ion battery separator apparatus for coating, institute
It states apparatus for coating to include at least: at least two slewing rollers, at least one set of first coating head, at least one set of second coating head and outstanding
Floating baking oven；
The slewing rollers are arranged on the path of basement membrane process, and first coating head is set to the suspension baking oven and institute
It states between slewing rollers；Or first coating head is set between the slewing rollers；
Second coating head is set between the suspension baking oven and the slewing rollers；
First coating head and the second coating head are distributed in the two sides of the basement membrane, for the basement membrane to be respectively coated
First face and the second face；
The back segment of the suspension baking oven is equipped with live-roller；
After basement membrane is put by let off roll, the suspension baking oven is transferred to by the slewing rollers, by institute in transmittance process
The first face that the first coating head coats the basement membrane is stated, the second face of the basement membrane is coated by second coating head, is formed double
The diaphragm of face coating；After the diaphragm enters the suspension baking oven, first carry out suspension drying, then under live-roller support into
Row drying.
A kind of scheme of optimization as lithium ion battery separator apparatus for coating of the present invention, the first coating head packet described in every group
Include at least two first sub- coating heads；Second coating head described in every group includes at least two second sub- coating heads.
A kind of scheme of optimization as lithium ion battery separator apparatus for coating of the present invention, first coating head include spray
One of coating head and gravure roller coating head are applied, second coating head includes spraying coating head.
A kind of scheme of optimization as lithium ion battery separator apparatus for coating of the present invention, the spraying of first coating head
Angle between direction and the membrane surface between 45 °~135 °, the spraying direction of second coating head with it is described
Angle between membrane surface is between 45 °~135 °.
A kind of scheme of optimization as lithium ion battery separator apparatus for coating of the present invention adjusts institute by the slewing rollers
State the angle that diaphragm enters the suspension baking oven, the normal direction of the approach axis of the diaphragm and the entrance of the suspension baking oven
Between angle between -15 °~15 °.
A kind of scheme of optimization as lithium ion battery separator apparatus for coating of the present invention in the suspension baking oven, carries out
The ratio between the path length of suspension drying and the path length dried under live-roller support are between 2:1 between 5:1.
A kind of scheme of optimization as lithium ion battery separator apparatus for coating of the present invention in the suspension baking oven, carries out
The path length of suspension drying is between 30 meters~50 meters.
The present invention also provides a kind of preparation method of lithium ion battery separator, the preparation method is included at least:
1) polymer and thickener are mixed, adds binder, stirred, form slurries, wherein the binder and institute
The mixture for stating thickener formation coats the polymer；
2) slurries are added to the water, are stirred, form uniform aqueous coating slurry；
3) basement membrane is provided, is coated the aqueous coating slurry using the described in any item apparatus for coating of claim 1~7
In the two-sided of the basement membrane, drying obtains the lithium ion battery separator.
A kind of scheme of optimization of preparation method as lithium ion battery separator of the present invention, the polymer include polycyclic
Ethylene oxide, polyvinyl chloride, chliorinated polyvinyl chloride, polypropylene, polyethylene, polymethyl methacrylate, Kynoar, polytetrafluoro
The mixture of one or both of ethylene, Viton.
A kind of scheme of optimization of preparation method as lithium ion battery separator of the present invention, the thickener include methyl
Cellulose, hydroxypropyl methyl cellulose, sodium carboxymethylcellulose, hydroxyethyl cellulose, polyacrylamide, polyvinyl alcohol, poly- second
One or both of alkene pyrrolidone, polyethylene glycol oxide, polyacrylic acid or three kinds of mixture.
A kind of scheme of optimization of preparation method as lithium ion battery separator of the present invention, the binder include poly- second
Enol, carboxymethyl cellulose, carboxylic styrene butadiene latex, polyesteramine, styrene analog thermoplastic elastomer, thermoplastic polyolefin elasticity
One or both of body, elastomer modified polypropylene, polyethylene, polypropylene, acrylonitrile, Viton or three kinds of mixing
Object.
A kind of scheme of optimization of preparation method as lithium ion battery separator of the present invention, the polymer and the increasing
For thick dose of mass ratio between 1:2 between 1:5, the quality of the binder accounts for the 5% of the aqueous coating slurry solid content
To 35%, the quality of the water accounts for the 70% to 95% of the aqueous coating slurry gross mass.
The present invention separately provides a kind of lithium ion battery separator prepared using above-mentioned preparation method.
As described above, lithium ion battery separator of the invention and preparation method thereof and apparatus for coating, have below beneficial to effect
Fruit:
1, completely new " dual coating-baking oven baking " technology mode, the painting may be implemented in apparatus for coating provided by the invention
The coated film that cloth apparatus carries out coating acquisition has coating, and uniformly coating accuracy is high, the high-quality feature of film surface.
2, the present invention is acted on using the suspension drying of suspension baking oven, and film surface slurry is not dry when avoiding dual coating, transmission
The problem of roller can scratch film surface, influence film surface coating.
3, the present invention is primary solvent using water, and coating cost is less expensive, and safety is higher, and greatly reducing use has
Solvent bring is poisonous and harmful, influence function of human body, is at high cost, pollution weight, recycles the problems such as cumbersome.
4, the present invention coats that be formed is polymer coating in membrane surface, and polymer coating is at low cost, and polymer
It is distributed in basement membrane surface layer with graininess, film and the contact of positive and negative interpolar and adhesive property can be promoted, so that interface resistance is reduced, electricity
Pond performance.
Detailed description of the invention
Fig. 1 is the overall schematic of one of embodiment of lithium ion battery separator apparatus for coating of the present invention.
Fig. 2 is the overall schematic of another embodiment of lithium ion battery separator apparatus for coating of the present invention.
Fig. 3 is the implementation structural schematic diagram of suspension baking oven in lithium ion battery separator apparatus for coating of the present invention.
Fig. 4 is the another implementation structural schematic diagram of suspension baking oven in lithium ion battery separator apparatus for coating of the present invention.
Fig. 5 is embodiment 1, the comparative result figure of embodiment 2 and comparative example 1 in the present invention.
Fig. 6 is the stereoscan photograph of film surface in the embodiment of the present invention 1.
Fig. 7 is the stereoscan photograph of film surface in the embodiment of the present invention 2.
Fig. 8 is the stereoscan photograph of film surface in comparative example 1 of the present invention.
Component label instructions
1 slewing rollers
11 first slewing rollers
12 second slewing rollers
13 third slewing rollers
2 first coating heads
3 second coating heads
4 suspension baking ovens
5 live-rollers
6 let off roll
7 jockey pulleys
8 basement membranes, diaphragm
9 baking oven blast orifices
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to attached drawing.It should be noted that only the invention is illustrated in a schematic way for diagram provided in the present embodiment
Basic conception, only shown in schema then with related component in the present invention rather than component count, shape when according to actual implementation
Shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its component cloth
Office's kenel may also be increasingly complex.
As shown in Figure 1 to 4, the present invention provides a kind of lithium ion battery separator apparatus for coating, and the apparatus for coating is at least
It include: at least two slewing rollers 1, at least one set of first coating head 2, at least one set of second coating head 3 and suspension baking oven 4；
The slewing rollers 1 are arranged on the path of the process of basement membrane 8, and first coating head 2 is set to the suspension baking oven 4
Between the slewing rollers 1；Or first coating head 2 is set between the slewing rollers 1；
Second coating head 3 is set between the suspension baking oven 4 and the slewing rollers 1；
First coating head 2 and the second coating head 3 are distributed in the two sides of the basement membrane 8, for the base to be respectively coated
The first face and the second face of film 8；
The back segment of the suspension baking oven 4 is equipped with live-roller 5；
After the basement membrane 8 is put by let off roll 6, it is transferred to the suspension baking oven 4 by the slewing rollers 1, was transmitted
The first face for coating the basement membrane 8 in journey by first coating head 2 coats the of the basement membrane 8 by second coating head 3
Two faces form the diaphragm 8 of dual coating；After the diaphragm 8 enters the suspension baking oven 4, suspension drying is first carried out, then described
Live-roller 5 is dried under supporting.
" dual coating-baking oven toasts " mode may be implemented using apparatus for coating of the invention, reach primary coating molding
Purpose, coating precision is high, and film surface is high-quality, so as to improve dual coating film surface performance.
It should be noted that direction of travel and path using the adjustable basement membrane 8 of the slewing rollers 1, make described
Basement membrane 8, which enters the suspension baking oven 4 with the angle of setting, is dried.In addition, the setting of two coating heads 2,3 positions is with described
Slewing rollers 1 do not influence subject to the coating quality of film surface, for example, after first coating head 2 coats the first face, in the diaphragm 8
Into before the suspension baking oven 4, any one slewing rollers 1 cannot contact first face, to guarantee the painting in first face
Cover quality.
It is as shown in Figure 1 the structural schematic diagram of apparatus for coating one of which embodiment, in present embodiment, the coating
Device is provided with 2 slewing rollers 1 (respectively the first slewing rollers 11 and the second slewing rollers 12), and the setting of the first coating head 2 exists
Between first slewing rollers 11 and the second slewing rollers 12, second coating head 3 is arranged in first slewing rollers 11 and institute
It states between suspension baking oven 4, wherein first slewing rollers 11 will not influence the coating in the first face.
The particular number of the slewing rollers 1 can determine according to actual needs, for example, if the tension of basement membrane 8 is insufficient,
It needs to increase jockey pulley 7 and controls tension, due to the addition of jockey pulley 7, it is necessary to increase slewing rollers correction and unreel angle, such as Fig. 2
It is shown the structural schematic diagram of another embodiment of apparatus for coating, the apparatus for coating is provided with 3 slewing rollers (the first slewing rollers
11, the second slewing rollers 12 and third slewing rollers 13), first coating head 2 is arranged in first slewing rollers 11 and second
Between slewing rollers 12, second coating head 3 is arranged between first slewing rollers 11 and the suspension baking oven 4.Therefore, root
New structure (such as above jockey pulley 7) may be added according to different demands, if the addition of new construction will lead to the traveling of basement membrane 8
The variation of angle then needs to be added more 1 correction angles of slewing rollers, it is to be understood that apparatus for coating of the invention is not limited to
Fig. 1 and structure shown in Fig. 2.
As an example, the first coating head 2 described in every group includes at least two first sub- coating heads；Second coating described in every group
First 3 include at least two second sub- coating heads.
As an example, first coating head 2 includes spraying one of coating head and gravure roller coating head, described second is applied
The leftover of bolt of cloth 3 includes spraying coating head.The present invention by providing the scheme of a variety of coating heads combination, can using spraying, extrusion coated,
One or more single coating methods such as roller coating, to cope with different coating demands.Therefore, coating has been widened in the combination of a variety of coating heads
Mode reduces coating limitation, makes apparatus for coating is compatible to coat more slurries of different nature.
Again it should be noted that in the present invention to two-sided coating in no particular order sequence, it can first coat the first face, after
The second face is coated, the second face can also be first coated, it is rear to coat the first face, herein with no restrictions.
As an example, first coating head 2 spraying direction and 8 surface of the basement membrane between angle between 45 °~
Between 135 °, the angle between the spraying direction of second coating head 3 and 8 surface of the basement membrane is between 45 °~135 °.
The specific angle of coating is depending on coated slurry properties and necessary requirement, it is preferable that the spraying side of first coating head 2
To vertical with 8 surface of basement membrane, i.e., angle is 90 °, and the spraying direction of second coating head 3 and 8 surface of basement membrane are hung down
Directly, i.e., angle is 90 °.
As an example, adjusting the diaphragm 8 by the slewing rollers (such as the first slewing rollers 11) enters the suspension baking oven 4
Angle, angle between the normal direction of the entrance of the approach axis of the diaphragm 8 and the suspension baking oven 4 between -15 °~
Between 15 °.Preferably, the angle between the normal direction of the entrance of the approach axis of the diaphragm 8 and the suspension baking oven 4 is
0 °, i.e., it is best that the described diaphragm 8, which enters the suspension baking oven 4 with 0 °,.
It should also be noted that, the suspension baking oven 4 can be a large scale baking oven, as shown in figure 3, suspension baking oven 4
In leading portion be vacant (when diaphragm 8 passes through be in unsupported suspended state), the back segment installation live-roller 5 of suspension baking oven 4 (every
5 holding state of driving roller is in when film passes through)；In addition, the suspension baking oven 4 is also possible to be dried by the small size of one group of connection
Case is constituted, as shown in figure 4, several baking ovens of leading portion are vacant, several baking ovens installation live-roller of back segment.In view of suspending
The manufacture craft difficulty of baking oven 4, the suspension baking oven 4 are preferably that the small size baking oven of one group of connection is constituted.
As an example, carrying out the path length of suspension drying and under the live-roller 5 support in the suspension baking oven 4
The ratio between path length dried is between 2:1 between 5:1.Preferably, carry out the path length of suspension drying with described
The ratio between path length that live-roller 5 is dried under supporting is between 3:1, for example, being arranged 4 as one of embodiment
Size it is identical and connection baking oven, first 3 are set as empty van, several live-rollers 5, the diaphragm are installed in the last one baking oven
8 are wound after three empty vans and a live-roller baking oven.
The detailed process that the diaphragm 8 is dried in suspension baking oven 4 are as follows: when the diaphragm 8 enters suspension baking oven 4, first
Suspension drying is vacantly carried out by the tension of both ends (winding end and coating end) tightening, it in this way can be to avoid the second not dry face quilt
Live-roller destroys, and solves the problem of live-roller can scratch the second face of diaphragm, influence film surface coating quality；After hanging drying
Diaphragm is supported by the live-roller 5 in suspension baking oven 4, is carried out last drying, is gone out baking oven after the completion of drying, and conventional winding work is carried out
Sequence.
But the path that the diaphragm 8 carries out suspension drying cannot be too long, can not be too short, and Path too long can cause diaphragm 8
It floats up and down；Path is too short to be will lead to the baking of diaphragm 8 and does not do, and when diaphragm 8 is by subsequent live-roller, live-roller 5 will affect film surface
Quality.As an example, carrying out the path length of suspension drying between 30 meters~50 meters in the suspension baking oven 4.
In addition, as shown in Figure 3 and Figure 4, the suspension baking oven 4 is internally provided with blast orifice 9, the blast orifice 9 is small length
Square structure, for accelerating the drying of coated film to air blast in suspension baking oven 4.
The present invention also provides a kind of preparation method of lithium ion battery separator, the preparation method includes at least following step
It is rapid:
Step 1) is first carried out, polymer and thickener are mixed, binder is added, stirs, forms slurries, wherein
The mixture that the binder and the thickener are formed coats the polymer；
Then step 2) is executed, the slurries are added to the water, is stirred, uniform aqueous coating slurry is formed；
Step 3) is finally executed, basement membrane is provided, using above-mentioned apparatus for coating by the aqueous coating slurry coated on described
Basement membrane it is two-sided, drying, obtain the lithium ion battery separator.
As an example, the polymer includes Pluronic F-127, polyvinyl chloride, chliorinated polyvinyl chloride, polypropylene, poly- second
The mixture of one or both of alkene, polymethyl methacrylate, Kynoar, polytetrafluoroethylene (PTFE), Viton.
As an example, the thickener includes methylcellulose, hydroxypropyl methyl cellulose, sodium carboxymethylcellulose, hydroxyl
One of ethyl cellulose, polyacrylamide, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol oxide, polyacrylic acid or two
Kind or three kinds of mixture.
As an example, the binder includes polyvinyl alcohol, carboxymethyl cellulose, carboxylic styrene butadiene latex, polyesteramine, benzene second
Ethylenic thermoplastic elastomer, thermoplastic polyolefin elastomer, elastomer modified polypropylene, polyethylene, polypropylene, acrylonitrile, fluorine
Change the mixture of one or both of rubber or three kinds.
In the slurries of step 1) preparation, mixture that the polymer is formed by the binder and the thickener
(can be referred to as colloid) cladding.Since used most of polymer material is water-insoluble (such as PMMA, PVDF), gather
Closing object partial size is submicron order or nanoscale, if being directly added to the water polymer, is difficult to be uniformly dispersed, may generate
It is a large amount of to reunite, or even turbid can not all form just Direct precipitation, therefore, using hydrophilic colloid by submicron order even nanometer
The polymer of grade is first uniformly coated, then is added to the water this as intermediate, dissolves colloid between polymer little particle,
In this way, better dispersion effect can be reached while inhibiting polymer to reunite.
Most binders and thickener show excellent compatibility in water, as medium can by polymer uniformly and
It effectively scatter, while portion of binder embodies the property for promoting slurry stable, certain after dispersing polymer
Slurry is able to maintain in degree to stablize.But the solid content of slurry is had certain limitations, solid content is unsuitable excessively high, otherwise scattered
Polymer little particle is easily reunited, and solid content should be lower than 40%.In addition, the ratio of binder is affected to size performance,
Binder ratio is bigger, and in coated polymer, effect is more preferable, and the surface covering after coating is also more stable, but excessive binder
Also result in coating film breathe freely commendable increase the phenomenon that.
As an example, the mass ratio of the polymer and the thickener between 1:2 between 1:5, the binder
Quality account for the 5% to 35% of the aqueous coating slurry solid content, the quality of the water accounts for the total matter of aqueous coating slurry
The 70% to 95% of amount.
After coating, polymer is evenly distributed on basement membrane surface layer with graininess, and the diameter of particle is greater than basement membrane aperture, in this way
Polymer beads will not block membrane surface pore structure.Since polymer exists with graininess, in lithium electricity battery core manufacturing process,
The contact performance of positive and negative anodes can be effectively promoted especially after pole piece hot pressing.
It should be noted that the aqueous coating slurry can be coated using apparatus for coating of the invention, but not
It is limited to this, in addition to this, lithium electric separator oil slurry can also be coated using apparatus for coating of the invention.
In short, no matter whether polymer is water solubility in the preparation method of lithium ion battery separator of the invention, can incite somebody to action
Polymer is uniformly dissolved or dispersed in water.The slurry prepared is based on water, organic solvent-free, has low pollution, low
Cost, without security risk advantage.
In addition the present invention also provides a kind of lithium ion battery separator, the diaphragm is prepared by above-mentioned preparation method.
Below by specific embodiment, invention is further explained.
Embodiment 1
1, the preparation of aqueous coating slurry
Aqueous coating slurry is prepared by the following procedure: polymer P MMA being mixed with thickener SBR with 1:2 mass fraction, so
The binder polyacrylic acid that quality is thickener 1/5th is added afterwards, is mixed 2-5 hours, revolving speed 1500rpm.It will mix
The slurry got togather pours among distilled water, and the quality of distilled water is ten times of thickener.It is slow with the speed of 500rpm after mixing
Slow stirring saves.
2, the coating of aqueous PMMA coating film
Aqueous coating slurry is placed in magazine, basement membrane uses 9 μm of PE basement membrane, basement membrane breadth 590mm, length 1030m,
Cloth length 1000m is effectively applied, 1 coating head 2 of coating head selects spraying coating head.Coating head 1, coating head 2 and diaphragm angle are set as 90 degree,
Oven temperature is 70 degree, coating speed 50m/min, 1 μm of coating layer thickness of PMMA coating, thus to obtain double-face spray painting coating film.
Embodiment 2
It is prepared for aqueous coating slurry in the same manner as in Example 1 and is coated, the difference is that, this implementation
For example in coating process, painting is first to use gravure roller coating head.
Embodiment 3
It is prepared for aqueous coating slurry in the same manner as in Example 1 and is coated, the difference is that, this implementation
Example is in aqueous coating slurry preparation process, polymeric oxidizer PVDF.
Comparative example 1
It is prepared for aqueous coating slurry in the same manner as in Example 1 and is coated, the difference is that, this implementation
Example is in coating process, without using equipment of the invention, but uses conventional dual coating equipment, utilizes " single side coating-baking oven
Drying-single side coating-baking oven drying " mode carries out coating drying.
EXPERIMENTAL EXAMPLE 1
In 25 DEG C, the environment of humidity 40%, carries out embodiment 1, embodiment 2 and the coating of comparative example 1 and compare, comparison knot
Fruit is as follows.
As shown in figure 5, spraying rate spraying is slightly above gravure roller coating, but compared with the conventional equipment of comparative example 1, it is two-sided same
When coating efficiency be much higher than conventional dual coating equipment.The film surface of coating, the second face are spraying, and technique is consistent, therefore main
It is compared with the first face, effect is as shown in Figure 6 to 8, can be seen that the film surface one of embodiment 1 Yu embodiment 2 from Fig. 6~Fig. 8
Cause property is above comparative example 1, can valid certificates by suspension baking oven and one-pass molding, can effectively reduce baking oven and live-roller pair
The influence of film surface, to improve film surface quality.
EXPERIMENTAL EXAMPLE 2:
Carry out the preparation of film with comparative example 1, embodiment 1 and embodiment 3, each 40 groups of preparation, then carry out air penetrability,
Stretching, puncture, bonding, removing, thermal contraction etc. are tested, experimental result such as table 1.
Table 1
As it can be seen from table 1 it is of the invention two-sided while coating because using a baking oven less, reduce high temperature to membrane coat
Influence, and reduce baking and avoid a degree of film roll side, improve finished product membrane coat activity, make membrane coat in battery
Higher viscosity is maintained in hot pressing, to reduce the interface resistance inside battery core.
In conclusion the present invention provides a kind of lithium ion battery separator and preparation method thereof and apparatus for coating, coating is utilized
One or more single coating methods such as spraying, extrusion coated, roller coating can be used in device, to cope with different coating demands.In addition, this
Invention is equipped with dedicated suspension baking oven, while to the two-sided carry out waterborne polymeric coating coating of diaphragm, drying and winding, realizing
Completely new " dual coating-baking oven baking " mode, primary coating molding.And the present invention provides a kind of waterborne polymeric surfaces
Coating schemes are not necessarily to any organic solvent, and polymer (regardless of whether for water solubility), which can be made, can coat the aqueous painting used
Cover slurry.By above scheme, the final consistency for guaranteeing that diaphragm is two-sided promotes coating accuracy, reduces failure area, obtain more
The film surface of even uniform, improves the imbibition liquid-keeping property of diaphragm, so that short circuit caused by film surface defect, open circuit are reduced, with very big
Ratio promote coating speed and diaphragm quality.And it is less expensive to coat cost, and safety is higher, and greatly reducing use has
The pollution of solvent bring and high cost and security risk.
So the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (13)
1. a kind of lithium ion battery separator apparatus for coating, which is characterized in that the apparatus for coating includes at least: at least two turn to
Roller, at least one set of first coating head, at least one set of second coating head and suspension baking oven；
The slewing rollers are arranged on the path of basement membrane process, and first coating head is set to the suspension baking oven and described turn
To between roller；Or first coating head is set between the slewing rollers；
Second coating head is set between the suspension baking oven and the slewing rollers；
First coating head and the second coating head are distributed in the two sides of the basement membrane, for being respectively coated the first of the basement membrane
Face and the second face；
The back segment of the suspension baking oven is equipped with live-roller；
After the basement membrane is put by let off roll, the suspension baking oven is transferred to by the slewing rollers, by institute in transmittance process
The first face that the first coating head coats the basement membrane is stated, the second face of the basement membrane is coated by second coating head, is formed double
The diaphragm of face coating；After the diaphragm enters the suspension baking oven, first carry out suspension drying, then under live-roller support into
Row drying.
2. lithium ion battery separator apparatus for coating according to claim 1, it is characterised in that: the first coating head described in every group
Including at least two first sub- coating heads；Second coating head described in every group includes at least two second sub- coating heads.
3. lithium ion battery separator apparatus for coating according to claim 1, it is characterised in that: first coating head includes
One of coating head and gravure roller coating head are sprayed, second coating head includes spraying coating head.
4. lithium ion battery separator apparatus for coating according to claim 1, it is characterised in that: the spray of first coating head
The angle between direction and the membrane surface is applied between 45 °~135 °, the spraying direction of second coating head and institute
The angle between membrane surface is stated between 45 °~135 °.
5. lithium ion battery separator apparatus for coating according to claim 1, it is characterised in that: adjusted by the slewing rollers
The diaphragm enters the angle of the suspension baking oven, the normal side of the approach axis of the diaphragm and the entrance of the suspension baking oven
Angle between is between -15 °~15 °.
6. lithium ion battery separator apparatus for coating according to claim 1, it is characterised in that: in the suspension baking oven, into
The path length of row suspension drying under live-roller support the ratio between path length for being dried between 2:1 to 5:1 it
Between.
7. lithium ion battery separator apparatus for coating according to claim 1, it is characterised in that: in the suspension baking oven, into
The path length of row suspension drying is between 30 meters~50 meters.
8. a kind of preparation method of lithium ion battery separator, which is characterized in that the preparation method includes at least:
1) polymer and thickener are mixed, adds binder, stirred, form slurries, wherein the binder and the increasing
Thick dosage form at mixture coat the polymer；
2) slurries are added to the water, are stirred, form uniform aqueous coating slurry；
3) basement membrane is provided, the aqueous coating slurry is coated on institute using the described in any item apparatus for coating of claim 1~7
The two-sided of basement membrane is stated, dries, obtains the lithium ion battery separator.
9. the preparation method of lithium ion battery separator according to claim 8, it is characterised in that: the polymer includes poly-
Oxireme, polyvinyl chloride, chliorinated polyvinyl chloride, polypropylene, polyethylene, polymethyl methacrylate, Kynoar, poly- four
The mixture of one or both of vinyl fluoride, Viton.
10. the preparation method of lithium ion battery separator according to claim 8, it is characterised in that: the thickener includes
Methylcellulose, hydroxypropyl methyl cellulose, sodium carboxymethylcellulose, hydroxyethyl cellulose, polyacrylamide, polyvinyl alcohol,
One or both of polyvinylpyrrolidone, polyethylene glycol oxide, polyacrylic acid or three kinds of mixture.
11. the preparation method of lithium ion battery separator according to claim 8, it is characterised in that: the binder includes
Polyvinyl alcohol, carboxymethyl cellulose, carboxylic styrene butadiene latex, polyesteramine, styrene analog thermoplastic elastomer, thermoplastic polyolefin bullet
One or both of property body, elastomer modified polypropylene, polyethylene, polypropylene, acrylonitrile, Viton or three kinds of mixing
Object.
12. the preparation method of lithium ion battery separator according to claim 8, it is characterised in that: the polymer and institute
The mass ratio of thickener is stated between 1:2 between 1:5, the quality of the binder accounts for the aqueous coating slurry solid content
5% to 35%, the quality of the water accounts for the 70% to 95% of the aqueous coating slurry gross mass.
13. a kind of lithium ion battery separator prepared using any one of claim 8~12 preparation method.
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| CN111192992A (en) * | 2020-01-20 | 2020-05-22 | 武汉中兴创新材料技术有限公司 | Preparation method and device of ultrathin coating diaphragm |
| CN112474135A (en) * | 2019-09-12 | 2021-03-12 | 广州汽车集团股份有限公司 | Preparation equipment and preparation method of solid electrolyte membrane |
| CN115870175A (en) * | 2022-12-15 | 2023-03-31 | 惠州市赢合科技有限公司 | Vacuum suction device and lithium battery pole piece coating and drying equipment |
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Application publication date: 20190215 |
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