WO2023063728A1 - 전기화학소자용 분리막 및 이를 포함하는 전기화학소자 - Google Patents
전기화학소자용 분리막 및 이를 포함하는 전기화학소자 Download PDFInfo
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- WO2023063728A1 WO2023063728A1 PCT/KR2022/015438 KR2022015438W WO2023063728A1 WO 2023063728 A1 WO2023063728 A1 WO 2023063728A1 KR 2022015438 W KR2022015438 W KR 2022015438W WO 2023063728 A1 WO2023063728 A1 WO 2023063728A1
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- VROAXDSNYPAOBJ-UHFFFAOYSA-N lithium;oxido(oxo)nickel Chemical group [Li+].[O-][Ni]=O VROAXDSNYPAOBJ-UHFFFAOYSA-N 0.000 description 1
- URIIGZKXFBNRAU-UHFFFAOYSA-N lithium;oxonickel Chemical compound [Li].[Ni]=O URIIGZKXFBNRAU-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 210000004705 lumbosacral region Anatomy 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229910021396 non-graphitizing carbon Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920001485 poly(butyl acrylate) polymer Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920001197 polyacetylene Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920006380 polyphenylene oxide Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 235000019423 pullulan Nutrition 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical group 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
-
- 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
- H01M50/451—Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic 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
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
-
- 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
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
Definitions
- the present invention relates to a separator for an electrochemical device having excellent binding force between a porous polymer substrate and a porous inorganic coating layer and electrical resistance characteristics, and an electrochemical device including the same.
- Secondary batteries typified by lithium ion secondary batteries are widely used as power sources for portable electronic devices such as notebook computers, mobile phones, digital cameras, and camcorders. In recent years, these batteries have been applied to various fields such as automobiles due to the feature of having high energy density.
- Lithium secondary batteries are in the limelight due to their high operating voltage and significantly higher energy density than conventional batteries such as Ni-MH, Ni-Cd, and sulfate-lead batteries using aqueous electrolytes.
- a lithium ion battery has safety problems such as ignition and explosion due to the use of an organic electrolyte, and has disadvantages in that manufacturing is difficult.
- Recent lithium ion polymer batteries have improved the weaknesses of these lithium ion batteries and are considered one of the next generation batteries, but their capacity is relatively low compared to lithium ion batteries and their discharge capacity is insufficient, especially at low temperatures. is urgently required.
- a separator in which a porous inorganic coating layer is formed by coating a mixture of an excessive amount of inorganic particles and a binder polymer on at least one surface of a separator substrate having a plurality of pores has been proposed.
- a polymer resin as a binder in the inorganic coating layer for the fixation of inorganic particles in the inorganic coating layer and the interlayer binding force between the separator and the electrode.
- the amount of the polymer resin increases, the binding force is improved but the interfacial resistance is lowered.
- An object of the present invention is to provide a separator for an electrochemical device having excellent resistance characteristics while securing heat resistance stability and durability, and an electrochemical device including the separator. It will also be readily apparent that the objects and advantages of the present invention may be realized by means or methods set forth in the claims and combinations thereof.
- a first aspect of the present invention relates to a separator for an electrochemical device, including a separator substrate and an inorganic coating layer formed on a surface of the separator substrate, wherein the separator substrate has a porous structure and includes a polymer material, and the inorganic coating layer silver inorganic particles and a binder material, and a concave pattern portion having a predetermined width from the outer circumferential end to the inside is formed in all or at least a portion of the outer circumferential portion on the surface of the separation membrane substrate, and the concave pattern portion is depressed in the surface The lumbar region is formed.
- the concave pattern part in the first side, has a recessed portion formed from one surface of the separator substrate toward the inside in the thickness direction, and has a surface roughness (Ra) of 0.8 to 3.2 It is.
- the inorganic coating layer has a concave pattern corresponding to the concave pattern part at a position corresponding to the concave pattern part, and the concave pattern part of the separator substrate and the concave pattern of the inorganic coating layer have a shape in which they are engaged with each other.
- the separator has a constant overall thickness, and each concave pattern is interlocked and fastened at a boundary where the inorganic coating layer and the separator substrate face each other.
- the area of the concave pattern portion is 5% to 40% of 100% of the area of the separator substrate.
- the concave pattern portion is formed with a recessed portion recessed inward from one surface of the separator substrate in the thickness direction, and the concave pattern portion is formed.
- the planar area of the concave portion is 20% to 80% of the total area of the concave pattern portion.
- the area of the concave pattern part is 5% to 40% of 100% of the area of the separator substrate, and the concave pattern part is separated from one surface of the separator substrate.
- Concave portions are formed that are recessed inward in the thickness direction, and the planar area of the concave portions is 20% to 80% of the total area of the concave pattern portion.
- the separation membrane substrate has a planar area of 20% to 80% of the total area of the concave pattern portion, and the surface roughness (Ra) of the concave pattern portion is from 0.8 to 3.2.
- a ninth aspect of the present invention is a separator for an electrochemical device according to any one of the first to eighth aspects, wherein the separator substrate is a porous sheet containing polyolefin.
- a tenth aspect of the present invention according to any one of the first to ninth aspects, wherein the inorganic particles are BaTiO 3 , Pb(Zr,Ti)O 3 (PZT), b 1-x La x Zr 1-y Ti y O 3 (PLZT, 0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1), Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT), Hafnia (HfO 2 ), SrTiO 3 , SnO 2 , CeO 2 , MgO, Mg(OH) 2 , NiO, CaO, ZnO, ZrO 2 , SiO 2 , Y 2 O 3 , Al 2 O 3 , AlOOH, Al(OH) 3 , SiC and TiO 2 It is to include one or more selected from the group consisting of.
- An eleventh aspect of the present invention relates to an electrode assembly, wherein the electrode assembly includes a negative electrode, a separator, and an anode, and the separator according to any one of the first to tenth aspects, wherein the negative electrode is a current collector, the collector It includes an electrode active material layer formed on at least one surface of the entirety and a negative electrode tab extending from the current collector and protruding out of the negative electrode, and the concave pattern portion of the separator is laminated so that all or at least part of the negative electrode tab overlaps.
- the cathode has an inclined surface at all or at least a part of the end of the electrode active material layer, and the inclined surface is laminated so that all or part of the concave pattern portion of the separator overlaps.
- the separator according to the present invention includes a separator substrate and an inorganic coating layer disposed on at least one side of the substrate, and a concave pattern portion having a concave pattern is applied only to an outer circumferential end portion of the separator substrate.
- the separator according to the present invention can secure high binding strength between the separator substrate and the inorganic coating layer and exhibit excellent resistance characteristics at the same time.
- the concave pattern portion of the outer circumferential end portion of the separator is disposed so as to overlap the tab portion of the electrode, so that lithium play The effect of preventing ting can be exerted.
- FIG. 1 is a schematic diagram showing a cross section of a separation membrane according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram showing the surface of a separator substrate of a separator according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram showing a cross section of an electrode assembly according to the prior art.
- FIG. 4 is a schematic diagram showing a cross section of an electrode assembly according to an embodiment of the present invention.
- the present invention relates to a separator for an electrochemical device and an electrochemical device including the same.
- the electrochemical device is a device that converts chemical energy into electrical energy by an electrochemical reaction, and is a concept including a primary battery and a secondary battery, and the secondary battery is capable of charging and discharging.
- the secondary battery is capable of charging and discharging.
- the separator according to the present invention includes a porous separator substrate including a plurality of pores and an inorganic coating layer formed on at least one surface of the separator substrate.
- 1 is a schematic diagram showing a cross section of a separation membrane 100 according to an embodiment of the present invention.
- FIG. 2 schematically shows a plan view of the separation membrane substrate 120 .
- the separation membrane substrate 120 has a concave pattern portion 120a having a predetermined width disposed on an outer circumference of an end of at least one side surface.
- the inorganic coating layer 110 is disposed on at least one surface of the separator substrate, preferably covering the entire surface of the separator substrate, and the concave pattern portion 120a is buried by the formation of the inorganic coating layer.
- the separator coated with the inorganic coating layer shows a flat surface without a pattern corresponding to the concave pattern portion outside the separator.
- the separator substrate may have a sheet shape in which a plurality of pores are formed as a porous ion-conducting barrier that passes ions while blocking electrical contact between the cathode and the anode.
- the pores are mutually connected to each other so that gas or liquid can pass from one side of the substrate to the other side.
- the shutdown function refers to a function of preventing thermal runaway of the battery by blocking the movement of ions by dissolving the thermoplastic resin and closing the pores of the separator base material when the battery temperature is high.
- the thermoplastic resin a thermoplastic resin having a melting point of less than 200°C is suitable, and polyolefin is particularly preferred.
- polymer resins such as polyethylene terephthalate, polybutylene terephthalate, polyacetal, polyamide, polycarbonate, polyimide, polyether ether ketone, polyether sulfone, polyphenylene oxide, polyphenylene sulfide, and polyethylene naphthalene. At least one of them may be further included.
- the separator substrate may be a non-woven fabric, a porous polymer film, or a laminate of two or more of them, but is not particularly limited thereto.
- the porous polymer substrate is a porous film and is any one of a) to e) below.
- a non-woven fabric web manufactured by integrating filaments obtained by melting/spinning a polymer resin
- a porous composite membrane having a multilayer structure comprising at least two of a) to d).
- the separator substrate preferably has a thickness of 4 to 15 ⁇ m. If the thickness is less than the above value, the function of the conductive barrier is not sufficient, while if it exceeds the above range (ie, if it is too thick), the resistance of the separator may excessively increase.
- the weight average molecular weight of the polyolefin may have a range of 100,000 to 5,000,000.
- the puncture strength of the separation membrane substrate may be 300 g or more from the viewpoint of improving manufacturing yield.
- the puncture strength of the separator substrate refers to the maximum puncture load (g) measured by performing a puncture test using a Kato tech KES-G5 handy compression tester under conditions of a radius of curvature at the tip of the needle of 0.5 mm and a puncture speed of 2 mm/sec.
- the separator substrate can be used as long as it is a planar porous polymer substrate used in an electrochemical device.
- a thin insulating film of 0.10 ⁇ m and generally having a thickness of 3 ⁇ m to 20 ⁇ m or 4 ⁇ m to 15 ⁇ m may be used.
- the porosity of the separator substrate is preferably 30% to 70%.
- the separation membrane substrate has a concave pattern portion 120a having a predetermined width from the outermost end to the inside on the outer circumferential portion of the surface.
- the concave pattern part may be formed on all or part of the outer circumference.
- a concave pattern portion may be formed at at least one of the four corners.
- concave pattern units may be formed at two facing corners. Referring to FIGS. 1 and 2 , it is schematically illustrated that the concave pattern portion 120a is formed on the outer circumference of the separation membrane substrate 120 .
- the planar area of the concave pattern portion may have a range of 5% to 40% with respect to the planar area of the separator substrate.
- the concave pattern portion may be formed by pressing a corresponding portion of the separator substrate with a pressure tool having a pattern before forming the inorganic coating layer. Since the concave pattern portion is formed as described above, the surface area of the corresponding portion is increased, and as a result, the binding area with the inorganic coating layer is widened, thereby improving the adhesion between the separator substrate and the inorganic coating layer.
- the concave pattern part exhibits an anchor effect of fixing the inorganic coating layer and the separator substrate to each other, the effect of improving binding force can be increased in this aspect as well.
- the effect of improving binding force can be increased in this aspect as well.
- the external appearance of the porous substrate does not change inside the separator, the target porosity or pore size according to the original design can be maintained.
- the concave pattern portion may be formed using a metal mesh.
- the concave pattern portion may be formed by disposing a metal mesh on the surface of the separator substrate where the concave pattern portion is to be formed and pressing the metal mesh and the separator substrate together.
- the shape of the concave pattern portion formed on the separation membrane substrate is formed to correspond to the shape of the metal mesh used.
- the metal mesh is not limited to a specific component or shape as long as the shape corresponding to the metal mesh can be transferred to the separator substrate by pressing the surface of the separator substrate.
- the metal mesh may be a mesh made of stainless steel (SUS).
- the concave pattern portion may be formed in a shape having a concave recess 122 recessed inward from the surface of the separation membrane substrate.
- the surface roughness (Ra) of the separator substrate may be 0.8 to 3.2, preferably 1.0 to 2.0.
- the plane area of the concave portion 122 in the plane area of the separation membrane substrate may be formed to be 20% to 80%, preferably 30% to 70% of the total plane area of the concave pattern portion.
- the 'planar area of the concave portion' refers to the ratio of the total area (width) of the concave pattern portion to the total area (width) of only the concave portion formed on the corresponding surface.
- the shape of the concave portion in the concave pattern portion is not particularly limited, but is preferably regular in terms of size, size, and arrangement. That is, when forming the concave pattern portion, it is preferable that the concave portions are not locally concentrated and uniformly distributed throughout the concave pattern portion.
- the concave pattern may have a shape such as a linear shape, a lattice shape, or a dot shape, but is not limited thereto.
- reference numerals 121 and 120b in FIG. 2 denote portions of the separation membrane substrate that maintain a flat surface without forming concave pattern portions.
- the separator according to the present invention has an inorganic coating layer 110 including inorganic particles and a binder material formed on at least one surface of the separator substrate, resulting from pores according to the interstitial volume between inorganic particles. Shows a porous structure.
- the pore size or porosity (ratio of pore volume) can be adjusted according to the size and size distribution of the particles.
- the inorganic coating layer may include 70 to 99.5% by weight of inorganic particles, preferably 80 to 99% by weight, based on 100% by weight of the inorganic coating layer.
- the concave portion of the concave pattern portion is filled with the inorganic coating layer without remaining empty.
- the concave portion of the concave pattern portion 122 of the separation membrane substrate is filled with an inorganic coating layer.
- the separator can be manufactured by applying the slurry for forming the inorganic coating layer to the surface of the separator substrate and drying it. At this time, the slurry flows into the concave portion of the separator substrate, thereby filling the concave portion.
- the separator substrate and the inorganic coating layer at the end of the separator have a form in which they are engaged and fastened by the corresponding concave patterns, so that even if shrinkage occurs in the separator substrate, the inorganic coating layer fixes the end and minimizes the shape deformation of the separator substrate.
- reference numeral 100a denotes a portion of the separator in which the separator substrate and the inorganic coating layer are engaged and fastened by mutually corresponding concave patterns
- 100b denotes other portions.
- the inorganic particles are not particularly limited as long as they are electrochemically stable. That is, the inorganic particles usable in the present invention are not particularly limited as long as oxidation and/or reduction reactions do not occur in the operating voltage range (eg, 0 to 5V based on Li/Li+) of the applied electrochemical device.
- the ion conductivity of the electrolyte may be improved by contributing to an increase in the degree of dissociation of an electrolyte salt, for example, a lithium salt in the liquid electrolyte.
- the inorganic particles include high dielectric constant inorganic particles having a dielectric constant of 5 or more, preferably 10 or more.
- inorganic particles having a dielectric constant of 5 or more include BaTiO 3 , Pb(Zr,Ti)O 3 (PZT), Pb 1-x La x Zr 1-y Ti y O 3 (PLZT, 0 ⁇ x ⁇ 1 , 0 ⁇ y ⁇ 1), Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT), hafnia (HfO 2 ), SrTiO 3 , SnO 2 , CeO 2 , MgO, Mg( OH) 2 , NiO, CaO, ZnO, ZrO 2 , SiO 2 , Y 2 O 3 , Al 2 O 3 , AlOOH, Al(OH) 3 , SiC and TiO 2 , and the like, and may include one or
- the binder may include an acrylic polymer and/or a PVDF polymer.
- the acrylic polymer may include, for example, a (meth)acrylic polymer.
- the (meth)acrylic polymer contains (meth)acrylic acid ester as a monomer, and these monomers include butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, ethyl (meth)acrylate, and methyl (meth)acrylic acid.
- n-propyl (meth) acrylate n-propyl (meth) acrylate, isopropyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, n-oxyl (meth) acrylate, isooctyl (meth) acrylate
- Monomers such as acrylate, isononyl (meth)acrylate, lauryl (meth)acrylate, and tetradecyl (meth)acrylate may be exemplified, and one or two or more of these may be included.
- the PVdF-based polymer may include at least one of a homopolymer of vinylidene fluoride (ie, polyvinylidene fluoride), a copolymer of vinylidene fluoride and a copolymerizable monomer, and a mixture thereof.
- a homopolymer of vinylidene fluoride ie, polyvinylidene fluoride
- a copolymer of vinylidene fluoride and a copolymerizable monomer and a mixture thereof.
- the monomer for example, a fluorinated monomer and/or a chlorine-based monomer can be used as the monomer.
- Non-limiting examples of the fluorinated monomer include vinyl fluoride; trifluoroethylene (TrFE); chlorofluoroethylene (CTFE); 1,2-difluoroethylene; tetrafluoroethylene (TFE); hexafluoropropylene (HFP); perfluoro(alkylvinyl)ethers such as perfluoro(methylvinyl)ether (PMVE), perfluoro(ethylvinyl)ether (PEVE) and perfluoro(propylvinyl)ether (PPVE); perfluoro(1,3-dioxole); and perfluoro(2,2-dimethyl-1,3-dioxole) (PDD), among which one or more may be included.
- PrFE trifluoroethylene
- CTFE chlorofluoroethylene
- TFE tetrafluoroethylene
- HFP hexafluoropropylene
- perfluoro(alkylvinyl)ethers such as per
- the PVDF-based polymer is polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), polyvinylidene fluoride-chlorofluoroethylene (PVDF) -CTFE), polyvinylidene fluoride-tetrafluoroethylene (PVdF-TFE), and polyvinylidene fluoride-trifluoroethylene (PVdF-TrFE).
- PVDF polyvinylidene fluoride
- PVDF-HFP polyvinylidene fluoride-hexafluoropropylene
- PVDF-CTFE polyvinylidene fluoride-chlorofluoroethylene
- PVdF-TFE polyvinylidene fluoride-tetrafluoroethylene
- PVdF-TrFE polyvinylidene fluoride-trifluoroethylene
- the average particle diameter (D 50 ) of the inorganic particles is not particularly limited, but is preferably in the range of 0.1 ⁇ m to 2.5 ⁇ m in order to form an inorganic coating layer with a uniform thickness and an appropriate porosity.
- the size of the pores in the inorganic coating layer may have a range of approximately 50 nm to 500 nm based on the longest diameter of the pores, but is not limited thereto.
- the separator according to the present invention can be manufactured by pressing the outer circumferential end portion of the separator substrate with a pressing member to form a concave pattern portion (S1), and coating an inorganic coating layer on at least one surface of the separator substrate (S2).
- a separator substrate is prepared and a concave pattern portion is formed at an outer circumferential end thereof (S1).
- the formation of the concave pattern portion may be performed by preparing a pressing member having a concave pattern formed on the surface thereof and pressing the outer circumferential end portion of the separator substrate using the pressing member.
- a pressing member on which the concave pattern is formed for example, a flat plate-type jig or a pressing roller may be used, but is not limited thereto. That is, it is not particularly limited as long as it can press the surface of the porous polymer sheet to form an irreversible concave pattern on the surface.
- an inorganic coating layer is coated on the surface of the separator substrate on which the concave pattern portion is formed (S2).
- a binder solution is prepared by dispersing or dissolving a polymer resin as a binder material in a solvent.
- a slurry for forming an inorganic coating layer is prepared by adding inorganic particles dispersed in the binder solution in the form of a bead mill.
- Non-limiting examples of the solvent include water, acetone, tetrahydrofuran, methylene chloride, chloroform, dimethylformamide, N-methyl-2-pyrrolidone (N-methyl-2-pyrrolidone, NMP) and cyclohexane (cyclohexane) may be one or a mixture of two or more selected from the group consisting of.
- a method of coating the slurry on a separator substrate may use a conventional coating method known in the art, for example, dip coating, die coating, roll coating, comma coating, or Various methods such as a method of mixing these may be used.
- a conventional drying method such as natural drying or blowing drying may be applied without particular limitation to the drying.
- Electrode assembly including the separator
- the present invention provides a secondary battery including the separator.
- the battery includes a negative electrode, a positive electrode, and a separator interposed between the negative electrode and the positive electrode, and the separator is a separator having the above-described characteristics.
- the separator in the electrode assembly, may be disposed so that all or at least a portion of the concave pattern portion faces the tab of the electrode.
- all or part of the concave pattern portion of the separator may be disposed to overlap the tab of the electrode.
- the tab of the electrode is preferably a tab of the negative electrode.
- the electrode assembly includes an anode 200, a cathode 300, and a separator 100.
- the positive electrode has a positive electrode active material layer 210 formed on both sides of the positive electrode current collector 220
- the negative electrode has a negative electrode active material layer 310 formed on the surface of the negative electrode current collector 320.
- the electrode active material layer may have an inclined surface (A) without showing a right angle at the end.
- Such an inclined surface may be intentionally formed in the design of the electrode or may be a characteristic that is unavoidably appeared in the manufacturing process of the electrode.
- the electrode active material layer is formed by applying a liquid electrode slurry to the current collector, the slurry at the distal end of the electrode flows down, so that the distal end may not maintain a right angle and an inclined surface may be formed.
- the electrode and the separator do not come into close contact with each other, and separation occurs, and the electrode and the separator may be separated by the spaced part.
- formation of lithium plating may be intensified at the distal end of the negative electrode due to an increase in interface resistance between the electrode and the separator due to the separation.
- the electrode assembly according to the present invention, the occurrence of lithium plating can be prevented because the concave pattern portion of the separator having improved binding characteristics is disposed so as to overlap the inclined surface of the electrode.
- the electrode may include a tab 320t that extends from the current collector and protrudes to the outside of the negative electrode, and the concave pattern portion of the separator overlaps at least the tab or the concave pattern portion of the separator A separator and an electrode may be stacked so as to overlap both the tab and the inclined surface.
- the electrode may be a negative electrode, a positive electrode, or both a negative electrode and a positive electrode.
- FIG. 4 is a schematic diagram showing an electrode assembly according to an embodiment of the present invention.
- the portion 100a of the separation membrane in which the concave pattern portion of the separation membrane substrate is disposed is disposed so as to overlap the tab of the electrode and the inclined surface of the electrode active material layer.
- the term 'overlapping' refers to overlapping on a plan view, but does not necessarily mean that they are in physical contact.
- the positive electrode includes a positive electrode current collector and a positive electrode active material layer including a positive electrode active material, a conductive material, and a binder resin on at least one surface of the current collector.
- the cathode active material is a layered compound such as lithium manganese composite oxide (LiMn 2 O 4 , LiMnO 2 , etc.), lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ), or a compound substituted with one or more transition metals; lithium manganese oxides such as Li 1+x Mn 2-x O 4 (where x is 0 to 0.33), LiMnO 3 , LiMn 2 O 3 , LiMnO 2 ; lithium copper oxide (Li 2 CuO 2 ); vanadium oxides such as LiV 3 O 8 , LiV 3 O 4 , V 2 O 5 , and Cu 2 V 2 O 7 ; Ni site type lithium nickel oxide represented by the formula LiNi 1-x M x O 2 ,
- the negative electrode includes a negative electrode current collector and a negative electrode active material layer including a negative electrode active material, a conductive material, and a binder resin on at least one surface of the current collector.
- the anode may include lithium metal oxide as an anode active material; carbon such as non-graphitizing carbon and graphite-based carbon; Li x Fe 2 O 3 (0 ⁇ x ⁇ 1), Li x WO 2 (0 ⁇ x ⁇ 1), Sn x Me 1-x Me' y O z (Me: Mn, Fe, Pb, Ge; Me' : Metal composite oxides such as Al, B, P, Si, elements of groups 1, 2, and 3 of the periodic table, halogens, 0 ⁇ x ⁇ 1;1 ⁇ y ⁇ 3;1 ⁇ z ⁇ 8); lithium metal; lithium alloy; silicon-based alloys; tin-based alloys; SnO, SnO 2 , PbO, PbO 2 , Pb 2 O 3 , Pb 3 O4, Sb 2 O 3 , Sb
- the conductive material is, for example, graphite, carbon black, carbon fiber or metal fiber, metal powder, conductive whisker, conductive metal oxide, activated carbon, and polyphenylene derivative. It may be any one selected from the group consisting of, or a mixture of two or more kinds of conductive materials. More specifically, natural graphite, artificial graphite, super-p, acetylene black, ketjen black, channel black, furnace black, lamp black, summer black, denka black, aluminum powder, nickel powder, oxidation It may be one selected from the group consisting of zinc, potassium titanate, and titanium oxide, or a mixture of two or more of these conductive materials.
- the current collector is not particularly limited as long as it does not cause chemical change in the battery and has high conductivity.
- it is made of stainless steel, copper, aluminum, nickel, titanium, fired carbon, or aluminum or stainless steel. A surface treated with carbon, nickel, titanium, silver or the like may be used.
- binder resin polymers commonly used in electrodes in the art may be used.
- Non-limiting examples of such a binder resin include polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-cotrichloroethylene, polymethyl methacrylate ( polymethylmethacrylate), polyethylexyl acrylate, polybutylacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate, ethylene vinyl acetate copolymer (polyethylene-co-vinyl acetate), polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, Cyanoethylpullulan, cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan and carboxyl methyl cellulose cellulose) and the like, but is not limited thereto.
- a battery may be manufactured by loading the electrode assembly prepared as described above into an appropriate case and injecting an electrolyte solution.
- the electrolyte solution is a salt having the same structure as A + B -
- a + includes an alkali metal cation such as Li + , Na + , K + or an ion composed of a combination thereof
- B - is PF 6 - , BF 4 - , Cl - , Br - , I - , ClO 4 - , AsF 6 - , CH 3 CO 2 - , CF 3 SO 3 - , N(CF 3 SO 2 ) 2 - , C(CF 2 SO 2 ) 3 -
- a salt containing the same anion or an ion consisting of a combination thereof is propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC) , dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran
- the present invention provides a battery module including the battery including the electrode assembly as a unit cell, a battery pack including the battery module, and a device including the battery pack as a power source.
- the device include a power tool powered by an omniscient motor and moving; electric vehicles, including electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and the like; electric two-wheeled vehicles including electric bicycles (E-bikes) and electric scooters (E-scooters); electric golf carts; A power storage system and the like may be mentioned, but is not limited thereto.
- separator substrate made of polyethylene (thickness: 9 ⁇ m, porosity: 45%), place SUS mesh on the outer circumference of the two facing corners, and press it using a hot press to form a separator substrate with a concave pattern.
- the area of the concave pattern portion in the separator was 25%.
- the separator when the separator is compressed by front pressure without a pattern, the roughness is rather reduced. As a result, not only the peel strength and adhesive strength are reduced, but also the porosity of the separator substrate is reduced, resulting in an increase in resistance of the separator after forming the inorganic coating layer.
- Example 4 Example 5, Comparative Example 4, and Comparative Example 5, the area (%) of the concave pattern portion of the separator substrate was commonly 20%, and the surface coverage was also commonly 40%.
- the surface coverage was also commonly 40%.
- the roughness is less than 1.0 due to pressure, the peel strength and adhesive strength are very low.
- the roughness is too high, the pores of the separator substrate are blocked, and after forming the inorganic coating layer, the resistance of the separator is greatly increased, and the insulation property is deteriorated due to local deformation.
- Two test pieces were prepared by cutting the membrane samples obtained in each Example or Comparative Example into a size of 80 mm (length) x 15 mm (width). After attaching the two test pieces with double-sided tape, they were peeled off at an angle of 180 degrees (180°) at a speed of 300 mm/min at 25° C., and the strength at this time was measured.
- Electrode adhesion specimens were prepared by pressing the negative electrode and the separators obtained in each comparative example and example under conditions of 60° C., 6.5 MPa, and 1 sec. This was peeled off at an angle of 180 degrees (180 °) at a speed of 300 mm / min at 25 ° C using Intron's UTM equipment, and the strength at this time was measured.
- the negative electrode used in the evaluation of electrode adhesion was prepared as follows. 96.3% by weight of natural graphite (particle size 20m), 1.0% by weight of super-p, styrene-butadiene rubber (SBR), and 1.5% by weight of carboxymethylcellulose (CMC), respectively, were mixed with 1.5% by weight and 1.2% by weight of carboxymethylcellulose (CMC). It was added to NMP to prepare a negative electrode active material slurry. The negative electrode active material slurry prepared above was applied to one surface of a copper current collector, dried, and pressed to prepare a negative electrode.
- SBR styrene-butadiene rubber
- CMC carboxymethylcellulose
- the separator obtained in each Example and Comparative Example was interposed between stainless steel (SUS) to manufacture a coin cell, and for this, using Solaton's 1470E cell test system and Frequency response analyzer 1255B, the scan range 100,000 Hz to 25 ° C. Resistance was measured through the results of electrochemical impedance spectroscopy under the condition of 10,000 Hz.
- the roughness Ra means a centerline average roughness, and means an arithmetic average value of a distance (absolute value) from a centerline to a roughness profile.
- the center line may be defined as follows.
- the centerline refers to a straight line parallel to the meanline and positioned at a position where the upper and lower areas surrounded by cross-sectional curves become equal.
- the average line is a line having a geometrical shape of a measurement surface from a roughness curve, and means a straight line in which a sum of squares of deviations from a roughness cross-section curve to a minimum is minimized.
- the average value after measuring the breakdown voltage of 30 samples after deformation was used. At this time, the insulation breakdown voltage measurement was increased from 0V to 100V/s, and when the current flowed more than 0.5mA and more than 3sec, it was determined that the insulation was destroyed, and the voltage value at this time was recorded.
- separator 110 inorganic coating layer, 122 recessed portion, 120 separator substrate, 100a portion where the separator substrate and inorganic coating layer are interlocked and fastened by a corresponding concave pattern, 100b portion other than 110a, and no concave pattern portion formed among separator substrates 121 and 120b 120a concave pattern part, 200 positive electrode, 210 positive electrode active material layer, 220 positive electrode current collector, 320t negative electrode tab, 300 negative electrode, 310 negative electrode active material layer, 320 negative electrode current collector, 400 separator
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Abstract
Description
분리막 기재 중 오목 패턴부의 면적(%) | 표면 Coverage (%) 오목 패턴부 중 요부의 면적 |
오목 패턴부의 거칠기 (Ra) |
박리강도 (분리막 기재와 무기 코팅층) (gf/15mm) |
전극 접착력 (분리막 및 전극) (gf/25mm) |
분리막 저항(Ohm) | |
비교예 1 | 0 | 0 | 0.43 | 3 | 5 | 0.68 |
비교예 2 | 45 | 10 | 0.59 | 30 | 12 | 0.68 |
실시예 1 | 25 | 35 | 1.03 | 109 | 78 | 0.71 |
실시예 2 | 25 | 55 | 1.42 | 121 | 107 | 0.70 |
실시예 3 | 25 | 65 | 1.73 | 156 | 121 | 0.69 |
비교예 3 | 3 | 100 | 0.86 | 20 | 19 | 1.31 |
표면 Coverage (%) 오목 패턴부 중 요부의 면적 |
오목 패턴부의 거칠기 (Ra) |
박리강도 (분리막 기재와 무기 코팅층) (gf/15mm) |
전극 접착력 (분리막 및 전극) (gf/25mm) |
분리막 저항(Ohm) | 절연파괴전압 (V) |
|
비교예 4 | 40 | 0.69 | 22 | 16 | 0.72 | 1809 |
실시예 4 | 40 | 1.26 | 102 | 77 | 0.71 | 1592 |
실시예 5 | 40 | 1.99 | 126 | 107 | 0.69 | 1406 |
비교예 5 | 40 | 3.48 | 131 | 116 | 1.28 | 249 |
Claims (12)
- 분리막 기재 및 상기 분리막 기재의 표면에 형성된 무기 코팅층을 포함하며,상기 분리막 기재는 다공성의 구조를 가지며 고분자 재료를 포함하고,상기 무기 코팅층은 무기물 입자 및 바인더 재료를 포함하며,상기 분리막 기재의 표면에는 외주 부분의 전 구간 또는 적어도 일부 구간에 외주 말단에서 내측으로 소정의 폭을 갖는 오목 패턴부가 형성되어 있으며, 상기 오목 패턴부는 표면에서 함몰된 요부가 형성되어 있는 것인 전기화학소자용 분리막.
- 제1항에 있어서,상기 오목 패턴부는 분리막 기재의 일측 표면으로부터 두께 방향 기준 내측으로 함몰된 요부가 형성되어 있으며, 표면 거칠기(Ra)가 0.8 내지 3.2인 것인 전기화학소자용 분리막.
- 제1항에 있어서,상기 무기 코팅층은 상기 오목 패턴부와 대응되는 위치에 상기 오목 패턴부에 대응되는 오목 패턴을 가지고 있으며, 분리막 기재의 오목 패턴부와 상기 무기 코팅층의 오목 패턴이 서로 맞물려 체결된 형상을 갖는 것인 전기화학소자용 분리막.
- 제3항에 있어서,상기 분리막은 전체 두께가 일정하며, 상기 무기 코팅층과 상기 분리막 기재가 면접하는 경계에서 각각의 오목 패턴이 서로 맞물려 체결된 형상을 갖는 것인 전기화학소자용 분리막.
- 제1항에 있어서,상기 오목 패턴부의 면적은 분리막 기재의 면적 100% 대비 5% 내지 40%인 것인 전기화학소자용 분리막.
- 제1항에 있어서,상기 오목 패턴부는 분리막 기재의 일측 표면으로부터 두께 방향을 기준으로 내측으로 함몰된 요부가 형성되어 있으며, 상기 요부의 평면적은 오목 패턴부의 총 면적 대비 20% 내지 80%인 것인 전기화학소자용 분리막.
- 제1항에 있어서,상기 오목 패턴부의 면적은 분리막 기재의 면적 100% 대비 5% 내지 40%이고, 상기 오목 패턴부는 분리막 기재의 일측 표면으로부터 두께 방향을 기준으로 내측으로 함몰된 요부가 형성되어 있으며, 상기 요부의 평면적은 오목 패턴부의 총 면적 대비 20% 내지 80%인 것인 전기화학소자용 분리막.
- 제1항에 있어서,상기 분리막 기재는 요부의 평면적이 오목 패턴부 총 면적 대비 20% 내지 80%이며, 상기 오목 패턴부는 표면 거칠기(Ra)가 0.8 내지 3.2인 것인 전기화학소자용 분리막.
- 제1항에 있어서,상기 분리막 기재는 폴리올레핀을 포함하는 다공성 시트인 것인 전기화학소자용 분리막.
- 제1항에 있어서,상기 무기물 입자는 BaTiO3, Pb(Zr,Ti)O3 (PZT), b1-xLaxZr1-yTiyO3(PLZT, 0<x<1, 0<y<1), Pb(Mg1/3Nb2/3)O3-PbTiO3(PMN-PT), 하프니아(HfO2), SrTiO3, SnO2, CeO2, MgO, Mg(OH)2, NiO, CaO, ZnO, ZrO2, SiO2, Y2O3, Al2O3, AlOOH, Al(OH)3, SiC 및 TiO2 로 이루어진 군에서 선택된 1종 이상을 포함하는 것인 전기화학소자용 분리막.
- 음극, 분리막 및 양극을 포함하며,상기 분리막은 제1항에 따른 것이며,상기 음극은 집전체, 상기 집전체의 적어도 일측 표면에 형성된 전극 활물질층 및 상기 집전체에서 연장되어 음극 외부로 돌출된 음극 탭을 포함하고,상기 분리막의 오목 패턴부가 상기 음극 탭과 전부 또는 적어도 일부가 중첩되도록 적층된 것인 전극 조립체.
- 제11항에 있어서,상기 음극은 전극 활물질층의 말단의 전부 또는 적어도 일부가 경사면을 가지며, 상기 경사면과 상기 분리막의 오목 패턴부 전부 및 일부가 중첩되도록 적층된 것인 전극 조립체.
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KR20210135328A (ko) | 2019-03-14 | 2021-11-12 | 아뜰리에 부쉬 에스.아. | 기체용 건식 펌프 및 다수의 기체용 건식 펌프들의 세트 |
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- 2022-10-12 EP EP22881355.6A patent/EP4407775A1/en active Pending
- 2022-10-12 JP JP2024503764A patent/JP2024526927A/ja active Pending
- 2022-10-12 US US18/579,055 patent/US20240332737A1/en active Pending
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KR20210135328A (ko) | 2019-03-14 | 2021-11-12 | 아뜰리에 부쉬 에스.아. | 기체용 건식 펌프 및 다수의 기체용 건식 펌프들의 세트 |
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