WO2019199137A1 - Procédé d'amélioration des propriétés d'un séparateur par réticulation post-traitement et séparateur obtenu ainsi - Google Patents

Procédé d'amélioration des propriétés d'un séparateur par réticulation post-traitement et séparateur obtenu ainsi Download PDF

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WO2019199137A1
WO2019199137A1 PCT/KR2019/004477 KR2019004477W WO2019199137A1 WO 2019199137 A1 WO2019199137 A1 WO 2019199137A1 KR 2019004477 W KR2019004477 W KR 2019004477W WO 2019199137 A1 WO2019199137 A1 WO 2019199137A1
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separator
post
physical properties
treatment
improving
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PCT/KR2019/004477
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English (en)
Korean (ko)
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김영복
김민지
남관우
이제안
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주식회사 엘지화학
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Priority claimed from KR1020190042803A external-priority patent/KR102314366B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to US16/646,595 priority Critical patent/US12054595B2/en
Priority to CN201980003596.1A priority patent/CN110914346B/zh
Priority to EP19785657.8A priority patent/EP3663337A4/fr
Publication of WO2019199137A1 publication Critical patent/WO2019199137A1/fr

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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/20—Manufacture of shaped structures of ion-exchange resins
    • C08J5/22—Films, membranes or diaphragms
    • C08J5/2287—After-treatment
    • H—ELECTRICITY
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    • 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
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
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    • 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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    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
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    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • H01M50/494—Tensile strength
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Definitions

  • the present invention is a method for improving physical properties of a membrane by post-treatment crosslinking and a separator by which a crosslinkable site is formed on a binder molecule through post-treatment on a completed separator with or without an olefin base, and then crosslinked.
  • the present invention relates to a method of improving the insulating and mechanical properties of the separator and a separator having improved physical properties by the post-treatment crosslinking.
  • the separator of the present invention can be used in a battery or the like, in particular can be used in a secondary battery.
  • Lithium secondary battery is an electrode assembly capable of charging and discharging a cathode / separator / cathode structure in the battery case, the electrode of the positive electrode and the negative electrode is coated with a slurry containing an electrode active material, etc. on one or both sides of the metal current collector It is prepared by drying and rolling.
  • the separator is one of the most important factors that determine the life of the secondary battery.
  • the anode and the cathode must be electrically insulated while the electrolyte can be smoothly passed through.
  • the high temperature stability is high while the mechanical strength is high.
  • US Patent No. 883354 discloses a microporous polymer layer composed of organic modified aluminum boehmite and organic polymers, but these have a problem in that the mechanical strength is weak and the defect rate during the process is high.
  • Korean Unexamined Patent Publication No. 2016-0140211 relates to a lithium battery electrolyte, and a negative electrode and a lithium battery including the same, and discloses an intermediate layer composed of an electrolyte, a solid electrolyte, and the like between a positive electrode and a negative electrode and serving as a separator.
  • the electrolyte is a structure corresponding to the present invention in that the electrolyte may be interposed between the positive electrode and the negative electrode, or may include a separator.
  • the surface-modified nanoparticle composite is different from the present invention in that it is dispersed in the block copolymer.
  • Korean Laid-Open Patent Publication No. 2012-0093772 discloses a binder including an amine group and a separator coating layer including the same; And it is described with respect to the separator containing a monomer containing a crosslinkable functional group, the content of a specific step of adding a solution containing a basic material or a material having an amine group is not disclosed.
  • J Appl Electrochem 46:69, 2016 discloses boehmite nanoparticles and polyvinylidene fluoride polymers as separators for lithium secondary batteries, but mentions that they are not suitable for high stress battery cell assembly.
  • RSC Adv., 6, 102762-102772, 2016, relates to a method of improving the properties of an electroosmotic membrane, in which TFC (m-phenylene diamine) and TMC (trimesoyl chloride) are combined with an electrospun PVDF support. film composite).
  • TFC m-phenylene diamine
  • TMC trimesoyl chloride
  • film composite triethyl amine
  • the present invention is to solve the above problems, an object of the present invention is to provide a method for improving the physical properties of the membrane can be improved insulation, tensile strength and elongation, and to provide a separator with improved physical properties through the method.
  • the present invention is characterized in that it is applied to an already prepared separator.
  • a first aspect of the present invention for solving the above problems comprises the steps of: a) preparing a separator in which a layer comprising a binder is formed on a substrate including or not containing a polyolefin substrate; b) desorbing some elements of the binder to transform them into crosslinkable linkages; and c) treating the separator with a cross-linking initiator and / or a reaction catalyst after the treatment of step b).
  • a crosslinking agent may be added at the same time.
  • the separator having a coating layer including a binder on the substrate including or not including the polyolefin substrate is a separator having a coating layer including a binder formed on the polyolefin substrate, or does not include a polyolefin substrate, and bonds between inorganic particles and the inorganic particles. Separation membrane comprising a binder for.
  • the inorganic particles are high dielectric constant inorganic particles having a dielectric constant of 1 or more, inorganic particles having piezoelectricity, inorganic particles having lithium ion transfer ability, alumina hydrate or a mixture of two or more thereof.
  • binder is at least one selected from the group consisting of PVdF, TFE and polyimide.
  • step b) is to desorb some elements of the binder to transform a single bond into a double bond, or to add a solution containing a substance having a basic substance or an amine group to the separator.
  • the basic material or the material having an amine group is at least one selected from alkali metal oxides, alkaline earth metal oxides, zeolites, limestone, sodium carbonate, ammonia, monoalkylamines, bialkylamines, trialkylamines, and the alkyl is one to one carbon. 10.
  • an azo compound or a peroxide compound may be used as a crosslinking initiator.
  • diaminoalkanes having 1 to 15 carbon atoms may be selected.
  • diaminoalkanes include 1,6-diaminohexane 1,5-diaminopentane.
  • the second aspect of the present invention provides a separator having improved physical properties by the physical property improving method of the separator of the present invention.
  • the third aspect of the present invention provides an electrochemical device including the separator having improved properties.
  • the method of improving physical properties of the separator according to the present invention has an advantage of providing a separator having improved insulation and tensile strength as compared to a conventional separator.
  • the present invention can be applied to both membranes with or without polyolefin substrate.
  • the conventional method is applied to a process for preparing a separator
  • the present invention provides a completely different approach in that it improves the physical properties of the prepared membrane.
  • 5 is a value of comparing the tensile strength and the stretching of the after-treatment and in-coating treatment of the BA1 separator.
  • Figure 6 is a value measured by comparing the volume resistance and resistance of the post-coating treatment and the coating treatment of the BA1 separator.
  • the present invention is a method for improving physical properties of the membrane by post-treatment crosslinking
  • It provides a method for improving the physical properties of the separator through a post-treatment comprising a.
  • Step b) may be a step of removing some elements of the binder to transform a single bond into a double bond to form a crosslinking site. Wherein some of the elements are H or F or Cl.
  • Step b) may be a step of adding a solution containing a substance having a basic substance or an amine group to the separator.
  • a crosslinking agent may be additionally added simultaneously with the crosslinking initiator.
  • the step c) is the cross-linking initiator is bonded to the bonding portion, the binding between the binder is made in the bonding portion, a separate cross-linking is formed between the cross-linking initiator, the cross-linking agent is bonded to the bonding portion, or the cross-linking It is the step of forming a separate crosslink between the agents.
  • Modification to the crosslinkable linking portion of step b) is to desorb H, F, Cl, etc. in the binder polymer to form a double bond.
  • Crosslinking is formed through the linkage between the crosslinking sites formed in step b), or the crosslinking initiator, crosslinking agent and / or reaction catalyst introduced in step c) bind between the crosslinking sites or separate crosslinking between the crosslinking initiator and the crosslinking agent. It appears that a bond is formed.
  • the separator having a coating layer including a binder on the substrate including or not including the polyolefin substrate is a separator having a coating layer including a binder formed on the polyolefin substrate, or does not include a polyolefin substrate, and bonds between inorganic particles and the inorganic particles. It may be a separator comprising a binder for.
  • polyethylene, polypropylene, or the like may be used as the polyolefin substrate used in a conventional separator, and technical details thereof are well known to those skilled in the art, and thus a detailed description thereof will be omitted.
  • a conventional membrane base material is omitted, and materials constituting the inorganic layer constitute a separator.
  • the separator composed of only the inorganic layer has a problem in that a short circuit may occur due to a decrease in the overall strength of the separator because the substrate of the polyolefin separator is omitted, resulting in damage to the separator interposed between the electrode assemblies.
  • Separation properties improvement method according to the present invention can be applied to a separator without a polyolefin-based separator substrate already completed, through which mechanical strength and insulation properties can be increased.
  • the inorganic particles according to the present invention serve as a kind of spacer which enables the formation of empty spaces between the inorganic particles to form fine pores and maintains a physical form, and generally at a high temperature of 200 ° C. or more. It has a property that the physical property does not change.
  • Such inorganic particles are not particularly limited as long as they are electrochemically stable, i.e., the inorganic particles that can be used in the present invention are oxidized and / or in the operating voltage range of the battery to be applied (for example, 0 to 5 V on a Li / Li + basis). Or it will not specifically limit, if a reduction reaction does not occur.
  • inorganic particles having high electrolyte ion transfer ability are used, since the performance in the electrochemical device can be improved, it is preferable that the electrolyte ion transfer ability as high as possible.
  • the inorganic particles have a high density, it is not only difficult to disperse when forming the separator, but also has a problem of weight increase during battery manufacturing, and therefore, the smallest possible density is preferable.
  • an inorganic material having a high dielectric constant it is possible to contribute to an increase in the degree of dissociation of an electrolyte salt such as lithium salt in the liquid electrolyte, thereby improving the ionic conductivity of the electrolyte solution.
  • the inorganic particles are high dielectric constant inorganic particles having a dielectric constant of 1 or more, preferably 10 or more, inorganic particles having piezoelectricity, inorganic particles having lithium ion transfer ability, alumina hydrate or these It may be a mixture of two or more of them.
  • Examples of the inorganic particles having a dielectric constant of 1 or more include SrTiO 3 , SnO 2 , CeO 2 , MgO, NiO, CaO, ZnO, ZrO 2 , Y 2 O 3 , Al 2 O 3 , TiO 2 , SiC, or a mixture thereof. There is, but is not limited to this.
  • the piezoelectric inorganic particles are insulators at normal pressure, but mean a material having electrical properties through electrical structure change when a predetermined pressure is applied.
  • the piezoelectricity inorganic particles not only exhibit a high dielectric constant having a dielectric constant of 100 or more, but also have a constant pressure. When tension or compression is applied, electric charge is generated so that one side is positively charged and the other side is negatively charged, thereby generating a potential difference between both surfaces.
  • the inorganic particles having the above characteristics when the internal short circuit of the positive electrode occurs due to external impact such as local crush, nail, etc., the anode and the cathode do not directly contact due to the inorganic particles coated on the separator, Due to the piezoelectricity of the inorganic particles, a potential difference in the particles is generated, and as a result, electron movement between both electrodes, that is, a minute current flows, thereby reducing the voltage of a gentle battery and thereby improving safety.
  • Examples of the inorganic particles having piezoelectric properties include BaTiO 3 , Pb (Zr, Ti) O 3 (PZT), Pb 1-x La x Zr 1-y Ti y O 3 (PLZT), Pb (Mg 1/3 Nb 2 / 3 ) O 3 -PbTiO 3 (PMN-PT) hafnia (HfO 2 ) or mixtures thereof, but is not limited thereto.
  • the inorganic particles having a lithium ion transfer capacity refers to inorganic particles containing lithium elements but having a function of transferring lithium ions without storing lithium, and the inorganic particles having lithium ion transfer ability are present in the particle structure. Since the lithium ions can be transferred and moved due to a kind of defect, the lithium ion conductivity in the battery is improved, thereby improving battery performance.
  • Examples of the inorganic particles having the lithium ion transfer ability include lithium phosphate (Li 3 PO 4 ), lithium titanium phosphate (Li x Ti y (PO 4 ) 3 , 0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 3), and lithium aluminum Titanium Phosphate (Li x Al y Ti z (PO 4 ) 3 , 0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 3), 14Li 2 O-9Al 2 O 3 -38 TiO 2 -39P 2 O 5 (LiAlTiP) xOy series glass (0 ⁇ x ⁇ 4, 0 ⁇ y ⁇ 13), lithium lanthanum titanate (Li x La y TiO 3, 0 ⁇ x ⁇ 2, 0 ⁇ y ⁇ 3) , such as, Li 3.25 Ge Li germanium thiophosphate such as 0.25 P 0.75 S 4 or the like (Li x Ge y P z S w ,
  • the alumina hydrate is classified into crystalline and gel-like according to the preparation method.
  • the crystalline alumina hydrate is gib ZUID i-Al (OH) 3, via light Al (OH) 3, Dyer Spore i-AlOOH, bohe and four species of boehmite i-AlOOH, gel shape of alumina hydrate is containing aluminum ions This corresponds to aluminum hydroxide in which an aqueous solution is precipitated with ammonia, and preferably boehmite i-AlOOH may be used.
  • the size of the inorganic particles is not limited, but is preferably in the range of 0.001 ⁇ m to 10 ⁇ m as much as possible for film formation of a uniform thickness and proper porosity. If it is less than 0.001 ⁇ m, it is difficult to control the properties of the separator due to the deterioration of dispersibility, and if it exceeds 10 ⁇ m, the thickness of the separator manufactured with the same solids content is increased, and the mechanical properties are deteriorated. The internal short circuit is more likely to occur during charging and discharging.
  • the binder is also commonly referred to as a polymeric binder and may have a feature that can be gelled during liquid electrolyte impregnation to exhibit a high degree of swelling.
  • the binder polymers are polymers having an excellent electrolyte impregnation rate, the electrolyte injected after battery assembly is permeated into the polymer, and the polymer having the absorbed electrolyte has electrolyte ion conducting ability.
  • the wettability of the battery electrolyte is improved and the polar electrolyte solution for the battery, which has been difficult to be used in the related art, is also possible.
  • the polymer solubility parameter of 15 to 45MPa preferably 1/2, more preferably from 15 to 25MPa 1/2 and 1/2 of 30 to 45MPa range.
  • solubility parameter greater than 1/2 to less than 15MPa and 45MPa 1/2 it is difficult to be impregnated with (swelling) by conventional liquid electrolyte batteries.
  • polyvinylidene fluoride polyvinylidene fluoride, polyvinylidene fluoride, hexafluoropropylene, polyvinylidene fluoride-trichloroethylene, polyvinylidene fluoride-chlorotrifluoroethylene, polymethyl methacrylate, polyacrylo Nitrile, polyvinylpyrrolidone, polyvinylacetate, ethylene vinyl acetate copolymer, polyethylene oxide, cellulose acetate, cellulose acetate butylate, cellulose acetate propionate, cyanoethyl pullulan, cyanoethyl polyvinyl alcohol, cyano Ethyl cellulose, cyanoethyl sucrose, pullulan, carboxymethyl cellulose, acrylonitrile styrene butadiene copolymer, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butyren
  • the substance having a basic substance or an amine group is at least one selected from alkali metal oxides, alkaline earth metal oxides, zeolites, limestone, sodium carbonate, ammonia, monoalkylamines, bialkylamines and trialkylamines.
  • the crosslinking initiator is an azo compound or a peroxide compound, and specifically, the azo compound is 2,2'-azobis (2-methylbutyronitrile), 2,2'-azobis. At least one of (isobutyronitrile), 2,2'-azobis (2,4-dimethylvaleronitrile) and 2,2'-azobis (4-methoxy-2,4-dimethylvaleronitrile) The above is selected, Preferably it is 2,2'- azobis (isobutyronitrile) (AIBN).
  • AIBN 2,2'- azobis (isobutyronitrile)
  • the peroxide compound is tetramethylbutyl peroxy neodecanoate, bis (4-butylcyclohexyl) peroxydicarbonate, di (2-ethylhexyl) peroxy carbonate, butyl peroxy neodecanoate, dipropyl per Oxy dicarbonate, diisopropyl peroxy dicarbonate, diethoxyethyl peroxy dicarbonate, diethoxyhexyl peroxy dicarbonate, hexyl peroxy dicarbonate, dimethoxybutyl peroxy dicarbonate, bis (3-methoxy-3 -Methoxybutyl) peroxy dicarbonate, dibutyl peroxy dicarbonate, dicetyl peroxy dicarbonate, dimyristyl peroxy dicarbonate, 1,1,3,3-tetramethylbutyl per Peroxypivalate, hexyl peroxy pivalate, butyl peroxy pivalate, trimethyl hexanoyl peroxide
  • the content of the crosslinking initiator, the crosslinking agent and / or the reaction catalyst is, based on the total weight of solids, more than 0% by weight to 5% by weight, preferably more than 0.2% by weight and 5% by weight or less, and more preferably more than 0.5 and 5% by weight. % Or less, most preferably more than 1% and 2% or less.
  • cross-linking may not occur completely.
  • the crosslinking initiator reacts at a specific temperature to form a crosslinked structure, and as the density of the crosslinked structure increases, physical properties related to rigidity are improved and insulation resistance is increased because it affects the movement of electrons.
  • the reaction temperature of the crosslinking initiator may be in the range of 40 ° C to 150 ° C, more preferably in the range of 50 ° C to 130 ° C. At a low temperature before reaching the temperature range, the reaction rate of the crosslinking initiator is slow, and the reaction occurs as the temperature range is reached, thereby forming a three-dimensional network structure by crosslinking.
  • reaction temperature of the cross-linking initiator is lower than 40 ° C, cross-linking reaction is difficult to occur, and when the reaction temperature is higher than 150 ° C, deformation of the conventional separator may occur or it may melt itself, which is not preferable.
  • the crosslinking agent may be at least one selected from diaminoalkanes having 1 to 15 carbon atoms, and specifically, at least one or more selected from 1,6-diaminohexane and 1,5-diaminopentane. Can be.
  • the present invention also provides an electrochemical device including an anode and a cathode, the separator interposed between the cathode and the cathode, and an electrolyte, wherein the electrochemical device may be a lithium secondary battery.
  • the positive electrode is manufactured by applying a mixture of a positive electrode active material, a conductive material, and a binder on a positive electrode current collector, followed by drying, and optionally, a filler may be further added.
  • the positive electrode current collector is generally made of a thickness of 3 ⁇ m or more and 500 ⁇ m or less. Such a positive electrode current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery.
  • the positive electrode current collector may be formed on a surface of stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel. The surface-treated with carbon, nickel, titanium, silver, etc. can be used.
  • the current collector may form fine irregularities on its surface to increase the adhesion of the positive electrode active material, and may be in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
  • the conductive material is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material.
  • a conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.
  • the binder is a component that assists the bonding of the active material and the conductive material to the current collector, and is generally added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material.
  • binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.
  • the filler is optionally used as a component for inhibiting expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery.
  • the filler include olefinic polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.
  • the negative electrode is manufactured by coating and drying a negative electrode material on a negative electrode current collector, and optionally, the components as described above may be further included if necessary.
  • the negative electrode current collector is generally made to a thickness of 3 ⁇ m or more and 500 ⁇ m or less.
  • a negative electrode current collector is not particularly limited as long as it has high conductivity without causing chemical change in the battery.
  • copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel Surface-treated with carbon, nickel, titanium, silver and the like on the surface, aluminum-cadmium alloy and the like can be used.
  • fine concavities and convexities may be formed on the surface to enhance the bonding strength of the negative electrode active material, and may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
  • carbon such as hardly graphitized carbon and graphite type carbon
  • the present invention may also provide a battery pack including the electrochemical device.
  • the battery pack may be used as a power source of a device requiring high temperature safety, long cycle characteristics, high rate characteristics, and the like, and a detailed example of such a device may include a mobile device and a wearable device.
  • a power tool that is driven by an electric motor Electric vehicles including electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and the like; Electric motorcycles including electric bicycles (E-bikes) and electric scooters (E-scooters); Electric golf carts; An energy storage system and the like, but are not limited thereto.
  • the CSP gen1 separator is a separator consisting of aluminum oxide Al 2 O 3 particles and PVDF binder only
  • BA1_B09PA1 separator is a separator having a coating layer consisting of Al 2 O 3 inorganic particles and PVDF binder on a polyethylene fabric substrate.
  • Triethylamine was used as a material for forming the crosslinking site. Each membrane was cut into 10 cm ⁇ 10 cm, and the membrane was immersed in 99% TEA solution at room temperature for 5 minutes, then taken out and dried in a fume hood.
  • a membrane formed with a crosslinking site was immersed in a solution obtained by dissolving 1.5% by weight of azobisisobutyronitrile (AIBN, 2,2'-Azobisiosbutyronitrile) in an ethanol solvent and treated for 30 minutes at 60 ° C. The membrane was then washed with ethanol and dried in a fume hood.
  • AIBN azobisisobutyronitrile
  • Electrode size and shape 19.6cm2 round
  • 1 to 4 show the measurement results of physical properties of Comparative Examples 1 and 2 and Examples 1, 2, 3, and 4 according to the present invention, respectively.
  • Gen1 membrane Bare is Comparative Example 1 without any treatment, TEA is Example 1, TEA + AIBN is Example 3, Bare in the BA1 membrane is Comparative Example 2 without any treatment, TEA is Example 2 , TEA + AIBN is Example 4.
  • the insulating properties (volume resistance) and mechanical strength of the separator were partially reduced in Example 1, but in Example 2 and Examples 3 and 4 after treatment with AIBN solution for crosslinking. Increased.
  • AIBN when treated to AIBN it can be seen that the insulation properties and mechanical strength increased in all separators. It can be seen that the physical property improvement method of the separator through the post-treatment according to the present invention can be applied to the already completed separator as described above to improve the physical properties of the separator.
  • triethylamine which is a material for forming a crosslinking site, in the preparation of slurry of the coating layer material and azo for crosslinking.
  • Electrode size and shape 19.6cm2 round
  • Comparative Example 3 In Coating
  • Example 4 After Coating
  • crosslinking in the process is Comparative Example 3 in which TEA and AIBN were added in the preparation of the coating layer slurry
  • post-processing crosslinking was Example 4 in which TEA and AIBN were treated after the coating layer was formed.
  • Example 5 treated with TEA and AIBN after the formation of the coating layer showed that the insulating properties (volume resistance) and mechanical strength of the coating layer slurry were increased compared to Comparative Example 3 in which TEA and AIBN were added. Therefore, it can be seen that the crosslinking separator through post-treatment is superior to the separator undergoing crosslinking during the coating process.

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Abstract

La présente invention concerne un procédé d'amélioration des propriétés d'un séparateur de façon à permettre au séparateur d'avoir des propriétés isolantes améliorées, une résistance à la traction et un allongement améliorés, et un séparateur ayant des propriétés améliorées au moyen du procédé. En particulier, la présente invention est caractérisée en ce qu'elle est appliquée à un séparateur déjà fabriqué. Une réticulation peut être formée par l'intermédiaire d'une double liaison après la formation de la double liaison dans un liant du séparateur déjà fabriqué, ou une réticulation peut être formée par ajout d'un initiateur de réticulation séparé à un liant du séparateur déjà fabriqué.
PCT/KR2019/004477 2018-04-13 2019-04-13 Procédé d'amélioration des propriétés d'un séparateur par réticulation post-traitement et séparateur obtenu ainsi WO2019199137A1 (fr)

Priority Applications (3)

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US16/646,595 US12054595B2 (en) 2018-04-13 2019-04-13 Method for improving physical properties of separator by post-treatment crosslinking and separator prepared thereby
CN201980003596.1A CN110914346B (zh) 2018-04-13 2019-04-13 通过后处理交联来改善隔板的物理特性的方法和由此制备的隔板
EP19785657.8A EP3663337A4 (fr) 2018-04-13 2019-04-13 Procédé d'amélioration des propriétés d'un séparateur par réticulation post-traitement et séparateur obtenu ainsi

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KR10-2018-0043356 2018-04-13
KR20180043356 2018-04-13
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