CN106252565A - Lithium ion battery separator that a kind of composite coated processes and preparation method thereof - Google Patents
Lithium ion battery separator that a kind of composite coated processes and preparation method thereof Download PDFInfo
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- CN106252565A CN106252565A CN201610847515.4A CN201610847515A CN106252565A CN 106252565 A CN106252565 A CN 106252565A CN 201610847515 A CN201610847515 A CN 201610847515A CN 106252565 A CN106252565 A CN 106252565A
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- 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
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/16—Homopolymers or copolymers of vinylidene fluoride
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- 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
- C09D177/00—Coating compositions based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Coating compositions based on derivatives of such polymers
- C09D177/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids
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- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
-
- 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
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- 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
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- 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
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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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
- 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
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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
- 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
- H01M50/431—Inorganic material
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/206—Applications use in electrical or conductive gadgets use in coating or encapsulating of electronic parts
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses lithium ion battery separator of a kind of composite coated process and preparation method thereof, this lithium ion battery separator includes basement membrane and the polymer coating being coated on basement membrane side and is coated on the inorganic particulate coating composition of basement membrane opposite side；Polymer coating is constituted with the polyvinylidene fluoride coating being coated in aramid fiber coating by being coated in epilamellar aramid fiber coating, and polymer coating thickness is 0.3 5 μm；Inorganic particulate coating is made up of inorganic particulate and the binding agent of different-grain diameter, and inorganic particulate coating layer thickness is 0.5 5 μm.The lithium ion battery separator of the present invention has mechanical property and heat resistance is outstanding, have good wettability to electrolyte and protect that fluidity, cycle performance be outstanding and security performance high.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly, it relates to a kind of polymer and inorganic particulate are combined
Coating strengthens lithium ion battery separator of security performance and cycle performance and preparation method thereof.
Background technology
Barrier film is one of indispensable four big critical materials in lithium ion battery, and it primarily serves and prevents both positive and negative polarity direct
Contact and be short-circuited, make the ion in electrolyte freely through to act on simultaneously.The performance of barrier film determines battery
Internal resistance and cell interface structure etc., directly affect chemical property and the safety of battery.The barrier film of excellent performance is to raising
The combination property of lithium ion battery has material impact.
The commercialization barrier film of current main-stream is microporous polyolefin film, owing to the fusing point of these microporous polyolefin film is relatively low, because of
This is when battery temperature raises, and this polyalkene diaphragm can shrink the most melted, consequently, it is possible to cause battery short circuit and occur
Fire even explodes.Additionally, this kind of polyalkene diaphragm is the best to the wettability of electrolyte, this causes barrier film can not to absorb and keep
Substantial amounts of electrolyte, thus affect the charge-discharge performance of battery.
Along with the development of electric vehicle and portable dam etc., currently to the performance requirement of electrokinetic cell increasingly
High.It is therefore desirable to the High-performance diaphragm that exploitation a new generation is for electrokinetic cell field.
Polyalkene diaphragm is carried out inorganic particulate or (with) polymer-coated process can improve barrier film to a certain extent
Heat-resistant stability and electrolyte wettability, but due to inorganic particulate or (with) bonding of polymer and microporous polyolefin film
Property poor, there is easy inorganic particulate and polymer coating and hold caducous problem.Simultaneously as inorganic particulate and polymer
Coming off of coating so that the variation that contacts of barrier film and battery pole piece, thus affect charge-discharge performance and the cycle life of battery.Single
Polyalkene diaphragm is carried out polymer-coated, although the electrolyte wettability of barrier film can be improved, but barrier film is heat-resisting purely
Performance improves inconspicuous；And individually polyalkene diaphragm is carried out inorganic particulate coating, although the heat-resisting of barrier film can be significantly improved
Property, but inorganic particulate easily comes off, and inorganic particulate density is big, is unfavorable for improving the energy per mass density of battery.
Summary of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, it is provided that a kind of novel polymerization
Composite diaphragm for lithium ion battery of thing and inorganic particulate coating processing and preparation method thereof.Prepare with the method that the present invention announces
Barrier film have good electrolyte affinity, outstanding heat-resistant stability and mechanical strength and electrode slice bonding more closely,
Inorganic particulate and polymer coating are difficult to advantages such as dropping, and the lithium ion battery using this barrier film to prepare has greater security energy
More preferably cycle performance, this preparation method has the features such as simple to operation and cost is relatively low simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: provide the lithium-ion electric that a kind of composite coated processes
Pond barrier film, including basement membrane and be coated on the polymer coating of basement membrane side and be coated on the inorganic particulate coating of basement membrane opposite side
Constitute；Described polymer coating is by being coated in epilamellar aramid fiber coating and the polyvinylidene fluoride coating being coated in aramid fiber coating
Constituting, polymer coating thickness is 0.3-5 μm；Described inorganic particulate coating is by the inorganic particulate of different-grain diameter and binding agent structure
Becoming, inorganic particulate coating layer thickness is 0.5-5 μm.
The lithium ion battery separator that composite coated of the present invention processes, wherein, the aramid fiber in described polymer coating
Coating is coated by aramid fiber coating solution, soak, dry after obtain, the thickness of aramid fiber coating is 0.2-3 μm；Described polymer coating
In polyvinylidene fluoride coating by polyvinylidene fluoride coating liquid through coating, dry after obtain, polyvinylidene fluoride coating thickness is
0.1-2μm；Described inorganic particulate coating is obtained after coating, drying by inorganic particulate coating solution.
The lithium ion battery separator that composite coated of the present invention processes, wherein, described aramid fiber coating solution is by following matter
The material composition of amount part: aramid fiber 3-10 part, solvent 60-87 part, cosolvent 3-5 part, dispersant 0.5-1 part, emulsifying agent
0.5-2 part, polymeric binder 1-2 part.
The lithium ion battery separator that composite coated of the present invention processes, wherein, described aramid fiber is meta-aramid
One or more combinations in fiber, para-aramid fiber, meta-aramid pulp, PPTA-pulp, the molecular weight of aramid fiber
For 1-10 ten thousand；Described solvent is N,N-dimethylformamide, DMAC N,N' dimethyl acetamide, N-Methyl pyrrolidone, dimethyl Asia
One in sulfone；Described cosolvent is one or more in sodium benzoate, lithium chloride, calcium chloride, sodium hydroxide, acetamide
Combination；Described dispersant be the one in polyethylene glycol oxide, ethylene-acrylic acid copolymer, ethylene-vinyl acetate copolymer or
Person's multiple combination；Described emulsifying agent be hexadecyltrimethylammonium chloride, octadecyl trimethyl ammonium chloride, sodium polyacrylate,
Polyacrylic acid potassium, polyacrylamide, Dodecyl trimethyl ammonium chloride, ethylene oxide-butylene oxide copolymer, oxirane-
One or more combinations in expoxy propane-epoxy butane copolymer；Described polymeric binder be polyvinylpyrrolidone,
One or more combinations in vinylpyridine network alkanone, vinyl acetate copolymer.
Composite coated of the present invention process lithium ion battery separator, wherein, described polyvinylidene fluoride coating liquid by
Polyvinylidene fluoride resin, organic solvent and porogen composition；The wherein matter of polyvinylidene fluoride resin in polyvinylidene fluoride coating liquid
Amount mark is 1%-20%, and the mass fraction of porogen is 0.2%-20%, and surplus is organic solvent.
The lithium ion battery separator that composite coated of the present invention processes, wherein, described polyvinylidene fluoride resin is poly-
Vinylidene fluoride homopolymer or vinylidene and the one in hexafluoropropylene copolymer；Described organic solvent is N, N-dimethyl methyl
One or more combinations in amide, DMAC N,N' dimethyl acetamide, N-Methyl pyrrolidone, dimethyl sulfoxide, acetone；Described
Porogen is the one in methanol, ethanol, propanol, butanol and deionized water.
The lithium ion battery separator that composite coated of the present invention processes, wherein, described inorganic particulate coating solution is by pressing
The base material of 5%-40% calculated according to percentage by weight and the solvent composition of 60%-95%, the percetage by weight of said components it
With for 100%；The described base material inorganic particulate by 60%-95% count by weight percentage and the polymer group of 5%-40%
Becoming, the percetage by weight sum of said components is 100%.
The lithium ion battery separator that composite coated of the present invention processes, wherein, described inorganic particulate is aluminium oxide, vigorous
Nurse stone, aluminium hydroxide, aluminium nitride, magnesium oxide, magnesium hydroxide, boron nitride, bayerite, silicon dioxide, titanium oxide, zirconium oxide,
One or more combinations in nickel oxide, zeolite particles；The particle diameter of all inorganic particulates is distributed in 0.03-1 μm, and inorganic
Particle diameter is distributed as 0.03-0.3 μm and accounts for 60%-80% mass share, and 0.3-0.6 μm accounts for 10%-20% mass share, 0.6-
1 μm accounts for 10%-20% mass share；Described polymer is by Kynoar, vinylidene--hexafluoropropylene copolymer, inclined fluorine second
Alkene--chlorotrifluoroethylcopolymer copolymer, vinylidene--trifluoro-ethylene copolymer, polymethyl methacrylate, polymethylacrylic acid fourth
One or more combinations in ester, polyacrylonitrile, PAEK, polyimides；Described solvent be N,N-dimethylformamide,
DMAC N,N' dimethyl acetamide, N-Methyl pyrrolidone, dimethyl sulfoxide, ethanol, acetone, butanone, dichloromethane, petroleum ether, four
Any one in hydrogen furan or multiple combination.
Composite coated of the present invention process lithium ion battery separator, wherein, described basement membrane be polyethene microporous membrane,
Microporous polypropylene membrane, polyethylene/polypropylene microporous membrane, polypropylene/polypropylene microporous membrane, polypropylene, polyethylene/polypropylene composite materials
One in microporous membrane, basement membrane thickness is 5～40 μm, and porosity is 35～65%；Described basement membrane is through corona or plasma
One or two kinds of method during body processes is anticipated.
The present invention also provides for the preparation method of the lithium ion battery separator that a kind of composite coated as above processes, including
Following steps:
(1) first the side of basement membrane after treatment is carried out aramid fiber coating, complete the coating of aramid fiber coating；
(2) in the aramid fiber coating of the same side of basement membrane, then carry out Kynoar coating, complete Kynoar and be coated with
The coating of layer；
(3) finally other side to basement membrane carries out the coating processing of inorganic particulate, completes the coating of inorganic particulate coating.
Lithium ion battery separator of composite coated process implementing the present invention and preparation method thereof, has following useful effect
Really:
1. the barrier film that Inventive polymers processes with inorganic particulate composite coated, compared with traditional polymer coating barrier film,
Because the existence of aramid fiber coating makes roughness increase so that between aramid fiber coating and polyvinylidene fluoride coating and polymerization
Thing coating is more tight with the bonding of basement membrane, difficult drop-off, and due to the existence of Kynoar, barrier film can be with electrode slice
Bonding is more tight, reduces gap, promotes the volume energy density of battery.
2., compared with traditional ceramic coating membrane, the inorganic particulate of different-grain diameter is arranged more tight each other, with
Basement membrane bonding is tightr, inorganic particulate coating difficult drop-off is tightr with electrode slice bonding.This composite diaphragm has aramid fiber coating
Outside good heat resistance and mechanical property, have again polyvinylidene fluoride coating good electrolyte wellability and protect fluidity,
Can be bondd the feature of battery pole piece effectively, and the inorganic particulate of different-grain diameter can be formed and bond more closely, do not allows in addition
Easy to fall off, the face coat that inorganic particulate is formed utilizes capillarity absorb more electrolyte and be saved in barrier film, favorably
Stability in time improving barrier film at high power charging-discharging and the high rate performance of battery, simultaneously because inorganic particulate coating heat resistance
Can be quite outstanding, and there is certain hardness, the perforation destruction to barrier film when hindering lithium dendrite growth can be played.
Polymer coating the most of the present invention and inorganic particulate coating can be worked in coordination with and be played enhancing barrier film heat resistance, and
And owing to polymeric layer is more tight with pole piece bonding, and inorganic particulate coating is not easy to come off, and improves the security performance of battery；
Can also work in coordination with to play simultaneously and improve hot strength and puncture strength, electrolyte wellability, the battery high rate performance of barrier film and follow
The ring life-span etc..
Test shows, barrier film of the present invention has good breathability, pick up, mechanical stretch intensity, heat-resisting size
Stability, substantially obtains with the security performance of lithium ion battery, high rate performance and cycle performance prepared by barrier film of the present invention
Improve.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the generalized section of the barrier film that present pre-ferred embodiments composite coated processes；
Wherein, 1, polyvinylidene fluoride coating；2, aramid fiber coating；3, basement membrane；4, inorganic particulate coating.
Detailed description of the invention
Below, in conjunction with accompanying drawing and detailed description of the invention, the present invention is described further:
In the present invention, if not refering in particular to, all of part, percentage ratio are unit of weight, the equipment used and raw material etc.
All it is commercially available or commonly used in the art.Method in following embodiment, if no special instructions, is the normal of this area
Rule method.
As it is shown in figure 1, the diaphragm for lithium ion battery that a kind of polymer and inorganic particulate composite coated process, including basement membrane
3 and be coated on the polymer coating of basement membrane side and be coated on the inorganic particulate coating 4 of basement membrane opposite side and constitute；Described polymerization
Thing coating is constituted with the polyvinylidene fluoride coating 1 being coated in aramid fiber coating by being coated in epilamellar aramid fiber coating 2, polymer
The gross thickness of coating is 0.3-5 μm；Aramid fiber coating is coated by aramid fiber coating solution, soak, dry after obtain, coating layer thickness is
0.2-3μm；Polyvinylidene fluoride coating is obtained after coating, drying by polyvinylidene fluoride coating liquid, and coating layer thickness is 0.1-2 μ
m.The formation of described aramid fiber coating, is by soaking after coating aramid fiber coating solution by basement membrane, is formed through mass transport process and have porous
The aramid fiber coating of structure.The formation of above-mentioned polyvinylidene fluoride coating, by polyvinylidene fluoride coating liquid through coating, drying, passes through
The effect of porogen forms the polyvinylidene fluoride coating of loose structure.Described inorganic particulate coating is by the inorganic particulate of different-grain diameter
Constituting with binding agent, inorganic particulate coating layer thickness is 0.5-5 μm.
Preferably, described aramid fiber coating solution is made up of the material of following mass parts: aramid fiber 3-10 part, solvent 60-87
Part, cosolvent 3-5 part, dispersant 0.5-1 part, emulsifying agent 0.5-2 part, polymeric binder 1-2 part.Wherein, described aramid fiber is fine
Dimension is one or more combinations in meta-aramid fibers, para-aramid fiber, meta-aramid pulp, PPTA-pulp,
The molecular weight of aramid fiber is 1-10 ten thousand；Described solvent is N,N-dimethylformamide, DMAC N,N' dimethyl acetamide, N-crassitude
One in ketone, dimethyl sulfoxide；Described cosolvent is in sodium benzoate, lithium chloride, calcium chloride, sodium hydroxide, acetamide
One or more combinations；Described dispersant is polyethylene glycol oxide, ethylene-acrylic acid copolymer, ethene-vinyl acetate copolymerization
One or more combinations in thing；Described emulsifying agent be hexadecyltrimethylammonium chloride, octadecyl trimethyl ammonium chloride,
Sodium polyacrylate, polyacrylic acid potassium, polyacrylamide, Dodecyl trimethyl ammonium chloride, ethylene oxide-butylene oxide copolymerization
One or more combinations in thing, epoxy ethane-epoxy propane-epoxy butane copolymer；Described polymeric binder is poly-
One or more combinations in vinylpyrrolidone, vinylpyridine network alkanone, vinyl acetate copolymer.
Preferably, described polyvinylidene fluoride coating liquid is made up of polyvinylidene fluoride resin, organic solvent and porogen；Wherein
In polyvinylidene fluoride coating liquid, the mass fraction of polyvinylidene fluoride resin is 1%-20%, and the mass fraction of porogen is 0.2%-
20%, surplus is organic solvent.Described polyvinylidene fluoride resin is polyvinylidene fluoride homopolymer or vinylidene and hexafluoro third
One in alkene copolymer；Described organic solvent is N,N-dimethylformamide, DMAC N,N' dimethyl acetamide, N-crassitude
One or more combinations in ketone, dimethyl sulfoxide, acetone；Described porogen be methanol, ethanol, propanol, butanol and go from
One in sub-water.
Preferably, described inorganic particulate coating solution is by the base material of the 5%-40% calculated in percentage by weight and 60%-
The solvent composition of 95%, the percetage by weight sum of said components is 100%；Described base material is by count by weight percentage
The inorganic particulate of 60%-95% and the polymer composition of 5%-40%, the percetage by weight sum of said components is 100%.Its
In, described inorganic particulate is aluminium oxide, boehmite, aluminium hydroxide, aluminium nitride, magnesium oxide, magnesium hydroxide, boron nitride, three hydroxyl aluminum
One or more combinations in stone, silicon dioxide, titanium oxide, zirconium oxide, nickel oxide, zeolite particles；All inorganic particulates
Particle diameter is distributed in 0.03-1 μm, and inorganic particulate particle diameter is distributed as 0.03-0.3 μm and accounts for 60%-80% mass share, 0.3-
0.6 μm accounts for 10%-20% mass share, and 0.6-1 μm accounts for 10%-20% mass share；Described polymer is by Kynoar, partially
Fluorothene is--hexafluoropropylene copolymer, vinylidene--chlorotrifluoroethylcopolymer copolymer, vinylidene--trifluoro-ethylene copolymer, poly-
One or more groups in methyl methacrylate, polybutyl methacrylate, polyacrylonitrile, PAEK, polyimides
Close；Described solvent is N,N-dimethylformamide, DMAC N,N' dimethyl acetamide, N-Methyl pyrrolidone, dimethyl sulfoxide, second
Any one in alcohol, acetone, butanone, dichloromethane, petroleum ether, oxolane or multiple combination.
Preferably, described basement membrane be polyethene microporous membrane, microporous polypropylene membrane, polyethylene/polypropylene microporous membrane, poly-third
One in alkene/microporous polypropylene membrane, polypropylene, polyethylene/polypropylene composite materials microporous membrane etc., basement membrane thickness is 5～40 μm, hole
Gap rate is 35～65%.Described basement membrane one or two kinds of method in corona or Cement Composite Treated by Plasma is located in advance
Reason.
Embodiment 1:
The diaphragm for lithium ion battery that the polymer of the present invention and inorganic particulate composite coated process, its preparation method is such as
Under:
A, prepare aramid fiber coating solution: weighing molecular weight is meta-aramid fibers 0.5kg of 5-7 ten thousand, solvent N, N-dimethyl
Methanamide is 8.5kg, cosolvent calcium chloride 0.3kg, dispersant polyethylene glycol oxide 0.1kg, emulsifying agent octadecyl trimethyl chlorine
Change ammonium 0.1kg, binding agent polyvinylpyrrolidone 0.2kg.Cosolvent calcium chloride is joined and solvent stirs to being completely dissolved,
Adding dispersant polyethylene glycol oxide while stirring, stirring at low speed to polyethylene glycol oxide, to being completely dissolved, adds meta-aramid fibers,
Mix homogeneously, obtains meta-aramid coating solution.
B, the preparation of polyvinylidene fluoride coating liquid: Kynoar 1kg, solvent is acetone, and porogen is ethanol, Qi Zhongbing
Ketone 9.5kg, ethanol 0.5kg.Kynoar, solvent and porogen stirring and dissolving are prepared as polyvinylidene fluoride coating liquid.
C, the preparation of inorganic particulate coating solution: weighing the aluminium oxide of different-grain diameter, wherein particle diameter in 0.03-0.3 μm is
0.7kg, 0.3-0.6 μm be 0.2kg, 0.6-1 μm be 0.1kg, Kynoar 0.4kg, solvent N-methyl pyrilidone 8kg.
Kynoar is joined stirring and dissolving in N-Methyl pyrrolidone, is slowly added to three kinds of different sizes the most while stirring
Aluminium oxide, carries out strength ultrasonic disperse 1h simultaneously.
Prepared by d, the coating of polymer coating: choose through sided corona treatment, thickness be the polyethylene diagrams of 9 μm, hole
Rate is 40%, uses gravure mode that the aramid fiber coating solution of preparation in step a is coated on the one side of barrier film, and soak 10s,
Using three grades of baking ovens to dry, the temperature of baking ovens at different levels is 50 DEG C, 55 DEG C, 60 DEG C, and the dried aramid fiber for preparing coats barrier film.Adopt
Polyvinylidene fluoride coating liquid step b prepared by gravure mode is coated on the same side of above-mentioned aramid fiber coating barrier film,
60 DEG C of drying, obtain unilateral polymer-coated barrier film after drying.
Prepared by e, the coating of inorganic particulate coating: the inorganic particulate coating solution using gravure step c to be prepared is coated with
It is distributed in the side of the above-mentioned uncoated polymer coating of polymer-coated barrier film, uses three grades of baking ovens to dry, baking ovens at different levels
Temperature is respectively 50 DEG C, 55 DEG C, 60 DEG C, dried prepared polymer and inorganic particulate composite coated barrier film.
The thickness of the lithium ion battery separator of above-mentioned composite coated is 14.2 μm, and aramid fiber coating layer thickness is 2 μm, polyvinylidene fluoride
Ene coatings thickness is 1 μm, and inorganic particulate coating layer thickness is 2.2 μm.
Embodiment 2:
The diaphragm for lithium ion battery that the polymer of the present invention and inorganic particulate composite coated process, its preparation method is such as
Under:
A, prepare aramid fiber coating solution: weigh para-aramid fiber 0.3kg, solvent dimethyl sulfoxide that molecular weight is 1-2 ten thousand
For 7kg, cosolvent sodium hydroxide 0.35kg, dispersant ethylene-acrylic acid copolymer 0.1kg, emulsifying agent trimethyl
Ammonium chloride 0.1kg, binding agent vinylpyridine network alkanone and vinyl acetate copolymer 0.15kg.Cosolvent calcium chloride is joined
Stirring in solvent to being completely dissolved, add dispersant polyethylene glycol oxide while stirring, stirring at low speed to polyethylene glycol oxide is to completely
Dissolve, add para-aramid fiber, mix homogeneously, obtain meta-aramid coating solution.
B, the preparation of polyvinylidene fluoride coating liquid: vinylidene and hexafluoropropylene copolymer 1kg, solvent is N, N-dimethyl
Acetamide, porogen is propanol, wherein N,N-dimethylacetamide 9kg, propanol 0.5kg.By vinylidene with hexafluoropropene altogether
Polymers, solvent and porogen stirring and dissolving are prepared as polyvinylidene fluoride coating liquid.
C, the preparation of inorganic particulate coating solution: weighing the magnesium oxide of different-grain diameter, wherein particle diameter in 0.03-0.3 μm is
0.6kg, 0.3-0.6 μm be 0.1kg, 0.6-1 μm be 0.1kg, Kynoar 0.5kg, solvent N-methyl pyrilidone 9kg.
Kynoar is joined stirring and dissolving in N-Methyl pyrrolidone, is slowly added to three kinds of different sizes the most while stirring
Magnesium oxide, carries out strength ultrasonic disperse 1.5h simultaneously.
Prepared by d, the coating of polymer coating: choose through sided corona treatment, thickness be the polypropylene diaphragm of 12 μm, hole
Rate is 45%, uses gravure mode that the aramid fiber coating solution of preparation in step a is coated on the one side of barrier film, and soak 12s,
Using three grades of baking ovens to dry, the temperature of baking ovens at different levels is 55 DEG C, 55 DEG C, 60 DEG C, and the dried aramid fiber for preparing coats barrier film.Adopt
Polyvinylidene fluoride coating liquid step b prepared with jet printing type coating method is coated on the same side of above-mentioned aramid fiber coating barrier film,
70 DEG C of drying, obtain unilateral polymer-coated barrier film after drying.
Prepared by e, the coating of inorganic particulate coating: the inorganic particulate coating solution using gravure step c to be prepared is coated with
Being distributed in the side of the above-mentioned uncoated polymer coating of polymer-coated barrier film, use baking oven to dry, the temperature of baking oven is 70
DEG C, dried prepared polymer and inorganic particulate composite coated barrier film.
The thickness of the lithium ion battery separator of above-mentioned composite coated is 17 μm, and aramid fiber coating layer thickness is 1.5 μm, polyvinylidene fluoride
Ene coatings thickness is 1.5 μm, and inorganic particulate coating layer thickness is 2 μm.
Embodiment 3:
The diaphragm for lithium ion battery that the polymer of the present invention and inorganic particulate composite coated process, its preparation method is such as
Under:
A, prepare aramid fiber coating solution: weigh PPTA-pulp 0.32kg, solvent dimethyl sulfoxide that molecular weight is 3-4 ten thousand
For 7.8kg, cosolvent sodium hydroxide 0.27kg, dispersant ethylene-acrylic acid copolymer 0.14kg, emulsifying agent dodecyl three
Ammonio methacrylate 0.18kg, binding agent vinylpyridine network alkanone and vinyl acetate copolymer 0.18kg.By cosolvent lithium chloride
Joining and stir in solvent to being completely dissolved, add dispersant ethylene-acrylic acid copolymer while stirring, stirring at low speed is to second
Alkene-acrylic copolymer, to being completely dissolved, adds PPTA-pulp, mix homogeneously, obtains p-aramid fiber coating solution.
B, the preparation of polyvinylidene fluoride coating liquid: Kynoar 1.2kg, solvent is N,N-dimethylacetamide, pore
Agent is propanol, wherein N,N-dimethylacetamide 8.7kg, methanol 0.45kg.By molten for the stirring of Kynoar, solvent and porogen
Solution is prepared as polyvinylidene fluoride coating liquid.
C, the preparation of inorganic particulate coating solution: weighing the boehmite of different-grain diameter, wherein particle diameter in 0.03-0.3 μm is
0.7kg, 0.3-0.6 μm be 0.2kg, 0.6-1 μm be 0.1kg, vinylidene--trifluoro-ethylene copolymer 0.5kg, solvent acetone
8.5kg.By vinylidene--trifluoro-ethylene copolymer joins stirring and dissolving in acetone, is slowly added to three kinds the most while stirring
The boehmite of different size, carries out strength ultrasonic disperse 1.5h simultaneously.
Prepared by d, the coating of polymer coating: choose polypropylene/polypropylene that process, that thickness is 20 μm through gas ions
Microporous membrane barrier film, porosity is 43%, uses gravure mode that the aramid fiber coating solution of preparation in step a is coated on barrier film
One side, soak 8s, uses baking oven to dry, and temperature is 70 DEG C, dried prepares aramid fiber coating barrier film.Intaglio plate formula is used to be coated with
The polyvinylidene fluoride coating liquid that step b is prepared by mode for cloth is coated on the same side of above-mentioned aramid fiber coating barrier film, 65 DEG C of drying, does
Unilateral polymer-coated barrier film is obtained after dry.
Prepared by e, the coating of inorganic particulate coating: the inorganic particulate coating solution using jet printing type coating step c to be prepared is coated with
Being distributed in the side of the above-mentioned uncoated polymer coating of polymer-coated barrier film, use baking oven to dry, the temperature of baking oven is 80
DEG C, dried prepared polymer and inorganic particulate composite coated barrier film.
The thickness of the lithium ion battery separator of above-mentioned composite coated is 27 μm, and aramid fiber coating layer thickness is 2.5 μm, polyvinylidene fluoride
Ene coatings thickness is 2 μm, and inorganic particulate coating layer thickness is 2.5 μm.
Comparative example 1:
A kind of diaphragm for lithium ion battery, its preparation method is as follows:
Select through sided corona treatment, thickness be 9 μm, porosity be the polyethylene diagrams of 40%, only carry out aramid fiber coating
With the coating processing of polyvinylidene fluoride coating, do not carry out the coating processing of inorganic particulate.Aramid fiber coating and polyvinylidene fluoride coating
Coating solution formula, preparation method identical with embodiment 1 with coating procedure etc..
Comparative example 2:
A kind of diaphragm for lithium ion battery, its preparation method is as follows:
With embodiment 2 difference, thickness be 12 μm, porosity be the polypropylene diaphragm of 45%, carry out sided corona treatment, no
Coating aramid fiber coating, polyvinylidene fluoride coating and inorganic particulate coating.Sided corona treatment condition is identical with embodiment 2.
Comparative example 3:
A kind of diaphragm for lithium ion battery, its preparation method is as follows:
Difference from Example 3 is, select through Cement Composite Treated by Plasma, thickness be 20 μm, porosity be 43%
Polypropylene/polypropylene barrier film, carry out the coating of inorganic particulate coating, and do not carry out aramid fiber coating and polyvinylidene fluoride coating
Coating.The coating solution formula of inorganic particulate coating, preparation method are identical with embodiment 3 with coating procedure etc..
Comparative example 4:
A kind of diaphragm for lithium ion battery, its preparation method is as follows:
Difference from Example 3 is, select through Cement Composite Treated by Plasma, thickness be 20 μm, porosity be 43%
Polypropylene/polypropylene barrier film, carry out the coating of aramid fiber coating and polyvinylidene fluoride coating, and do not carry out inorganic particulate coating
Coating.Coating solution formula, preparation method and the coating procedure etc. of aramid fiber coating and polyvinylidene fluoride coating and the complete phase of embodiment 3
With.
Comparative example 5:
A kind of diaphragm for lithium ion battery, its preparation method is as follows:
Difference from Example 3 is, select thickness be 20 μm, porosity be the polypropylene/polypropylene barrier film of 43%,
Only carry out Cement Composite Treated by Plasma.Plasma process conditions is identical with embodiment 3.
Below, pick up, the contraction to the diaphragm for lithium ion battery that embodiment 1-3 and comparative example 1-5 prepare
Rate, longitudinal tensile strength, puncture strength, 800 capacity reservations of 2C/2C discharge and recharge are evaluated, evaluation result such as table 1:
The performance test results of the diaphragm for lithium ion battery that table 1 embodiment 1-3 and comparative example 1-5 prepare
Find out from upper table experimental result, although individually coated polymer or inorganic particulate can improve the dependency of barrier film
Can, but effect is not the most obvious.Basement membrane is carried out the method utilizing the present invention to announce polymer and inorganic particulate is combined
Coating can significantly more improve the performance of barrier film, and polymer and inorganic particulate coating can be worked in coordination with and be improved barrier film stretching
Intensity and puncture strength, electrolyte absorbance, thermostability and cycle performance of battery etc..
Test shows, barrier film of the present invention has good breathability, pick up, mechanical stretch intensity, heat-resisting size
Stability, substantially obtains with the security performance of lithium ion battery, high rate performance and cycle performance prepared by barrier film of the present invention
Improve.
It will be apparent to those skilled in the art that can technical scheme as described above and design, make other various
Corresponding change and deformation, and all these change and deformation all should belong to the protection domain of the claims in the present invention
Within.
Claims (10)
1. the lithium ion battery separator that a composite coated processes, it is characterised in that include basement membrane and be coated on basement membrane side
Polymer coating and be coated on basement membrane opposite side inorganic particulate coating constitute；Described polymer coating is by being coated on basement membrane
Aramid fiber coating and the polyvinylidene fluoride coating that is coated in aramid fiber coating constitute, polymer coating thickness is 0.3-5 μm；Described
Inorganic particulate coating is made up of inorganic particulate and the binding agent of different-grain diameter, and inorganic particulate coating layer thickness is 0.5-5 μm.
The lithium ion battery separator that composite coated the most according to claim 1 processes, it is characterised in that described polymer is coated with
Aramid fiber coating in Ceng is coated by aramid fiber coating solution, soak, dry after obtain, the thickness of aramid fiber coating is 0.2-3 μm；Described
Polyvinylidene fluoride coating in polymer coating is obtained after coating, drying by polyvinylidene fluoride coating liquid, Kynoar
Coating layer thickness is 0.1-2 μm；Described inorganic particulate coating is obtained after coating, drying by inorganic particulate coating solution.
The lithium ion battery separator that composite coated the most according to claim 2 processes, it is characterised in that described aramid fiber coating
Liquid is made up of the material of following mass parts: aramid fiber 3-10 part, solvent 60-87 part, cosolvent 3-5 part, dispersant 0.5-1
Part, emulsifying agent 0.5-2 part, polymeric binder 1-2 part.
The lithium ion battery separator that composite coated the most according to claim 3 processes, it is characterised in that described aramid fiber
For one or more combinations in meta-aramid fibers, para-aramid fiber, meta-aramid pulp, PPTA-pulp, virtue
The molecular weight of synthetic fibre is 1-10 ten thousand；Described solvent is N,N-dimethylformamide, DMAC N,N' dimethyl acetamide, N-crassitude
One in ketone, dimethyl sulfoxide；Described cosolvent is in sodium benzoate, lithium chloride, calcium chloride, sodium hydroxide, acetamide
One or more combinations；Described dispersant is polyethylene glycol oxide, ethylene-acrylic acid copolymer, ethene-vinyl acetate copolymerization
One or more combinations in thing；Described emulsifying agent be hexadecyltrimethylammonium chloride, octadecyl trimethyl ammonium chloride,
Sodium polyacrylate, polyacrylic acid potassium, polyacrylamide, Dodecyl trimethyl ammonium chloride, ethylene oxide-butylene oxide copolymerization
One or more combinations in thing, epoxy ethane-epoxy propane-epoxy butane copolymer；Described polymeric binder is poly-
One or more combinations in vinylpyrrolidone, vinylpyridine network alkanone, vinyl acetate copolymer.
The lithium ion battery separator that composite coated the most according to claim 2 processes, it is characterised in that described polyvinylidene fluoride
Ene coatings liquid is made up of polyvinylidene fluoride resin, organic solvent and porogen；Wherein polyvinylidene fluoride in polyvinylidene fluoride coating liquid
The mass fraction of olefine resin is 1%-20%, and the mass fraction of porogen is 0.2%-20%, and surplus is organic solvent.
The lithium ion battery separator that composite coated the most according to claim 5 processes, it is characterised in that described polyvinylidene fluoride
Olefine resin is polyvinylidene fluoride homopolymer or vinylidene and the one in hexafluoropropylene copolymer；Described organic solvent is N,
One in dinethylformamide, DMAC N,N' dimethyl acetamide, N-Methyl pyrrolidone, dimethyl sulfoxide, acetone or many
Plant combination；Described porogen is the one in methanol, ethanol, propanol, butanol and deionized water.
The lithium ion battery separator that composite coated the most according to claim 2 processes, it is characterised in that described inorganic particulate
Coating solution is made up of the base material of the 5%-40% calculated in percentage by weight and the solvent of 60%-95%, the weight of said components
Amount percent sum is 100%；Described base material is by the inorganic particulate of 60%-95% count by weight percentage and 5%-40%
Polymer composition, the percetage by weight sum of said components is 100%.
The lithium ion battery separator that composite coated the most according to claim 7 processes, it is characterised in that described inorganic particulate
It is aluminium oxide, boehmite, aluminium hydroxide, aluminium nitride, magnesium oxide, magnesium hydroxide, boron nitride, bayerite, silicon dioxide, oxidation
One or more combinations in titanium, zirconium oxide, nickel oxide, zeolite particles；The particle diameter of all inorganic particulates is distributed in 0.03-1 μ
M, and inorganic particulate particle diameter is distributed as 0.03-0.3 μm and accounts for 60%-80% mass share, and 0.3-0.6 μm accounts for 10%-20% matter
Amount share, 0.6-1 μm accounts for 10%-20% mass share；Described polymer is by Kynoar, vinylidene--and hexafluoropropene is common
Polymers, vinylidene--chlorotrifluoroethylcopolymer copolymer, vinylidene--trifluoro-ethylene copolymer, polymethyl methacrylate, poly-
One or more combinations in butyl methacrylate, polyacrylonitrile, PAEK, polyimides；Described solvent is N, N-
Dimethylformamide, DMAC N,N' dimethyl acetamide, N-Methyl pyrrolidone, dimethyl sulfoxide, ethanol, acetone, butanone, dichloromethane
Any one in alkane, petroleum ether, oxolane or multiple combination.
The lithium ion battery separator that composite coated the most according to claim 1 processes, it is characterised in that described basement membrane is poly-
Ethylene microporous membrane, microporous polypropylene membrane, polyethylene/polypropylene microporous membrane, polypropylene/polypropylene microporous membrane, polypropylene/poly-second
One in alkene/polypropylene composite materials microporous membrane, basement membrane thickness is 5～40 μm, and porosity is 35～65%；Described basement membrane is through electricity
One or two kinds of method in dizzy or Cement Composite Treated by Plasma is anticipated.
10. a preparation method for the lithium ion battery separator that the composite coated as described in any one of claim 1-9 processes, its
It is characterised by, comprises the steps:
(1) first the side of basement membrane after treatment is carried out aramid fiber coating, complete the coating of aramid fiber coating；
(2) in the aramid fiber coating of the same side of basement membrane, then carry out Kynoar coating, complete polyvinylidene fluoride coating
Coating；
(3) finally other side to basement membrane carries out the coating processing of inorganic particulate, completes the coating of inorganic particulate coating.
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