Separator, secondary battery cell, battery device and electrical device

Abstract

A separator, a secondary battery cell, a battery device and an electrical device. The secondary battery cell comprises a positive electrode sheet, a negative electrode sheet and a separator, the separator being arranged between the positive electrode sheet and the negative electrode sheet. The separator comprises a porous base film and a coating located on at least one side of the porous base film. The coating comprises organic particles, the organic particles having no glass transition temperature below 300°C. The secondary battery cell has high gravimetric energy density, high reliability, and good high-temperature performance.

Description

Separator, secondary battery cell, battery device, and power consuming device

[0001] Cross Reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202410946473.4, filed on July 15, 2024, entitled “Separator, Battery Cell and Power Consuming Device” and Chinese Patent Application No. 202411384170.4, filed on September 30, 2024, entitled “Separator, Secondary Battery Cell, Battery Device, and Power Consuming Device”, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present disclosure relates to a separator, a secondary battery cell, a battery device, and a power consuming device. BACKGROUND

[0004] With the increasingly wide range of applications of secondary battery cells, people's demand for the use of secondary battery cells is also increasing, such as the increasingly high requirements for their energy density and reliability. Therefore, how to make the secondary battery cell have higher energy density under the premise of high reliability is a technical problem to be solved at present. SUMMARY

[0005] The present disclosure provides a separator, a secondary battery cell, a battery device, and a power consuming device, which have high mass energy density, high reliability, and good high-temperature performance.

[0006] In a first aspect, the present disclosure provides a secondary battery cell, comprising a positive electrode sheet, a negative electrode sheet, and a separator, the separator being arranged between the positive electrode sheet and the negative electrode sheet, the separator comprising a porous base film and a coating layer arranged on at least one side of the porous base film, the coating layer comprising organic particles, the organic particles having no glass transition temperature below 300°C.

[0007] The secondary battery cell using the organic particles with small density can have higher mass energy density. The organic particles of the present disclosure have no glass transition temperature below 300°C, indicating that they have good heat resistance and thermal stability. By arranging the above-mentioned organic particles on the porous base film, the organic particles can generate a force resisting the thermal shrinkage of the porous base film, thereby improving the thermal shrinkage of the whole separator, improving the heat resistance of the separator, and improving the reliability of the secondary battery cell. In addition, the organic particles of the present disclosure have good stability in a high-temperature environment, and can also make the secondary battery cell have good high-temperature performance. Therefore, the secondary battery cell using the separator provided by the present disclosure can have high mass energy density, high reliability, and good high-temperature performance.

[0008] In some embodiments, the organic particles are at least one of thermoset resin polymers or cross-linked polymers.

[0009] In some embodiments, the organic particles are amorphous polymers.

[0010] In some embodiments, the organic particles have a true density of 1.0 g / cm 3 -2.0 g / cm 3 ; optionally 1.0 g / cm 3 -1.8 g / cm 3 .

[0011] In some embodiments, the organic particles have a volume distribution particle size Dv50 of less than 1 pm, optionally 50 nm-800 nm.

[0012] In some embodiments, the organic particles include one or more of phenolic resin-based organic particles, polymer particles containing triazine ring structural units, silicon-containing organic resin particles.

[0013] In some embodiments, the phenolic resin-based organic particles are thermoset resol polymers.

[0014] In some embodiments, the phenolic resin-based organic particles have a volume distribution particle size Dv50 of 160 nm-800 nm.

[0015] In some embodiments, the polymer particles containing triazine ring structural units include a bridging structure connecting the triazine ring structural units. Optionally, the bridging structure includes one or a combination of two or more of alkylene, alkylene ether, alkylene amine, ester group, amide group.

[0016] In some embodiments, the polymer particles containing triazine ring structural units further have a substituent on the triazine ring structural units, the substituent including one or a combination of two or more of alkyl, alkenyl, phenyl, cycloalkyl, amine group, hydroxyl, halogen.

[0017] In some embodiments, the polymer particles containing triazine ring structural units include at least one of melamine formaldehyde-based polymers and derivatives thereof, etherified melamine formaldehyde-based polymers and derivatives thereof, etherified melamine formaldehyde-polyol polymers and derivatives thereof, etherified melamine formaldehyde-polybasic acid polymers and derivatives thereof, etherified melamine formaldehyde-polyamine amide polymers and derivatives thereof.

[0018] In some embodiments, the melamine aldehyde polymers and derivatives thereof include one or more of melamine formaldehyde, benzoguanamine formaldehyde, melamine- benzoguanamine formaldehyde, melamine-(2,4-diamino-l,3,5-triazine) formaldehyde, melamine-(6-methyl-l,3,5-triazine-2,4-diamine) formaldehyde, melamine-(2,4,6-triethylamino-l,3,5-triazine) formaldehyde, trihydrazinotriazine formaldehyde, melamine-(2-amino-4-methylamino-l,3,5-triazine) formaldehyde, melamine-(2,4-diamino-6-dimethylamino-l,3,5-triazine) formaldehyde.

[0019] In some embodiments, the etherified melamine aldehyde polymers and derivatives thereof include one or more of methyl etherified melamine formaldehyde, butyl etherified melamine formaldehyde, methyl etherified benzoguanamine formaldehyde, butyl etherified benzoguanamine formaldehyde.

[0020] In some embodiments, the etherified melamine aldehyde-polyol polymers and derivatives thereof include one or more of methyl etherified melamine formaldehyde-ethylene glycol polymer, methyl etherified melamine formaldehyde-1,2 propanediol polymer, methyl etherified melamine formaldehyde-1,4 butanediol polymer, methyl etherified melamine formaldehyde-polyester polyol polymer, methyl etherified melamine formaldehyde-polyvinyl alcohol polymer, butyl etherified melamine formaldehyde-ethylene glycol polymer, butyl etherified melamine formaldehyde-1,2 propanediol polymer, butyl etherified melamine formaldehyde-1,4 butanediol polymer, butyl etherified melamine formaldehyde-polyester polyol polymer.

[0021] In some embodiments, the etherified melamine aldehyde-polycarboxylic acid polymers and derivatives thereof include one or more of methyl etherified melamine formaldehyde-oxalic acid polymer, methyl etherified melamine formaldehyde-malic acid polymer, methyl etherified melamine formaldehyde-succinic acid polymer, methyl etherified melamine formaldehyde-citric acid polymer, methyl etherified melamine formaldehyde-terephthalic acid polymer, methyl etherified melamine formaldehyde-phthalic acid polymer, butyl etherified melamine formaldehyde-oxalic acid polymer, butyl etherified melamine formaldehyde-malic acid polymer, butyl etherified melamine formaldehyde-citric acid polymer, butyl etherified melamine formaldehyde-terephthalic acid polymer, butyl etherified melamine formaldehyde-phthalic acid polymer.

[0022] In some embodiments, the etherified melamine aldehyde-polyamine amide polymers and derivatives thereof include one or more of methyl etherified melamine formaldehyde-oxamide polymer, methyl etherified melamine formaldehyde-malonamide polymer, methyl etherified melamine formaldehyde-isophthalimide polymer, butyl etherified melamine formaldehyde-oxamide polymer.

[0023] In some embodiments, the volume distribution particle size Dv50 of the polymer particles containing triazine ring structural units is 160 nm-800 nm.

[0024] In some embodiments, the silicon-containing organic resin particles are silicon-containing organic crosslinking resin particles, and the silicon-containing organic resin particles contain carbon-carbon bonds and siloxane structures.

[0025] In some embodiments, the silicon-containing organic resin particles are silicon-containing organic crosslinking resin particles, and the silicon-containing organic resin particles are network structures formed with carbon-carbon bonds as the main chain, and the side chains contain siloxane structures.

[0026] In some embodiments, the silicon-containing organic crosslinking resin particles include crosslinking structural units.

[0027] Optionally, the crosslinking structural units include one or more of divinylbenzene structural units, diethylene glycol divinyl ether structural units, triethylene glycol divinyl ether structural units, maleic acid diallyl ester structural units, ethylene glycol dimethacrylate structural units, 1,4-butanediol diacrylate structural units, 1,6-hexanediol diacrylate structural units, 1,8-octanediol diacrylate structural units, trimethylolpropane triacrylate structural units, pentaerythritol trimethacrylate structural units, tetraethylene glycol dimethacrylate structural units, tripropylene glycol diacrylate structural units, 2,2,4-trimethyladipoyl bis[2-ethylaziridine] structural units, 1,1-nonanedioyl bis[2-methylaziridine] structural units, 1,1-(1,3-phenylenedicarbonyl) bis[2-methylaziridine] structural units, trimethylolpropane tris(2-methyl-1-aziridinyl propionate) structural units, trimethylolpropane-tris[3-(2-methylaziridinyl) propionate] structural units, pentaerythritol tris(3-aziridinyl) propionate structural units.

[0028] In some embodiments, the volume distribution particle size Dv50 of the silicon-containing organic resin particles is 86 nm-310 nm.

[0029] In some embodiments, the ratio of the volume distribution particle size Dv50 of the organic particles to the average pore size of the porous base film is greater than or equal to 1.1. In this way, the problem of pore blocking can be reduced, and the air permeability and ion conductivity of the separation membrane can be improved.

[0030] In some embodiments, the coating further includes a binder.

[0031] In some embodiments, the mass content of the organic particles in the coating is 50%-99% based on the total mass of the coating.

[0032] In some embodiments, the thickness of the coating is 0.5 μm-5 μm.

[0033] In some embodiments, the areal density of the coating is 0.45 g / m 2 -5 g / m 2 .

[0034] In a second aspect, the present disclosure provides a battery device comprising a plurality of the secondary battery cell of the first aspect of the present disclosure.

[0035] In a third aspect, the present disclosure provides a power consuming device comprising the secondary battery cell of the first aspect of the present disclosure or the battery device of the second aspect of the present disclosure.

[0036] In a fourth aspect, the present disclosure provides a separator film comprising a porous base film and a coating layer on at least one side of the porous base film, wherein the coating layer comprises organic particles, and the organic particles have no glass transition temperature below 300°C.

[0037] In some embodiments, the organic particles are at least one of thermosetting resin polymers or cross-linked polymers.

[0038] In some embodiments, the organic particles are amorphous polymers.

[0039] In some embodiments, the organic particles have a true density of 1.0 g / cm 3 -2.0 g / cm 3 , optionally 1.0 g / cm 3 -1.8 g / cm 3 .

[0040] In some embodiments, the organic particles have a volume distribution particle size Dv50 of less than 1 μm, optionally 50 nm-800 nm.

[0041] In some embodiments, the organic particles comprise one or more of phenol formaldehyde resin-based organic particles, polymer particles containing triazine ring structure units, and silicon-containing organic resin particles. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments of the present disclosure will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present disclosure, and other drawings can also be obtained according to the drawings without creative labor for those skilled in the art.

[0043] FIG. 1 shows a schematic diagram of a secondary battery cell according to some embodiments of the present disclosure.

[0044] FIG. 2 shows a schematic diagram of a power consuming device according to some embodiments of the present disclosure.

[0045] In the drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0046] Hereinafter, embodiments of the separator, the secondary battery cell, the battery device, and the power-consuming device of the present disclosure are specifically disclosed while appropriately referring to the accompanying drawings. However, there are cases where unnecessary detailed explanations are omitted. For example, there are cases where detailed explanations of matters that are already well known, repeated explanations of actually identical structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. Furthermore, the drawings and the following explanations are provided so that those skilled in the art can fully understand the present disclosure, and are not intended to limit the subject matter recited in the claims.

[0047] The "ranges" disclosed in the present disclosure are defined in the form of lower and upper limits, and a given range is defined by selecting one lower limit and one upper limit, and the selected lower limit and upper limit define the boundaries of a particular range. The ranges defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, i.e., any lower limit can be combined with any upper limit to form a range. For example, if the ranges 60-120 and 80-110 are listed for a particular parameter, it is understood that the ranges 60-110 and 80-120 are also contemplated. Furthermore, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In the present disclosure, unless otherwise specified, a numerical range "a-b" represents a shorthand manner of describing the arbitrary real number combinations between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all the real numbers between "0-5" have been listed herein, and "0-5" is just a shorthand notation for these numerical combinations. In addition, when it is stated that a certain parameter is an integer ≥ 2, it is equivalent to disclose that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and the like.

[0048] Unless otherwise specified, all embodiments and optional embodiments of the present disclosure can be combined with each other to form new technical solutions, and such technical solutions should be considered to be included in the disclosure content of the present disclosure.

[0049] Unless otherwise specified, all technical features and optional technical features of the present disclosure can be combined with each other to form new technical solutions, and such technical solutions should be considered to be included in the disclosure content of the present disclosure.

[0050] If not otherwise specified, all steps of the present disclosure can be performed in sequence or randomly, preferably in sequence. For example, the method comprises steps (a) and (b) means that the method can comprise steps (a) and (b) in sequence, or steps (b) and (a) in sequence. For example, the method can further comprise step (c) means that step (c) can be added to the method in any sequence, for example, the method can comprise steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0051] If not otherwise specified, in the present disclosure, the terms "first", "second", etc. are used to distinguish different objects, rather than to describe a specific sequence or primary and secondary relationship.

[0052] In the present disclosure, the terms "a plurality of" and "a plurality of" refer to two or more.

[0053] In the description of the embodiments of the present disclosure, if not otherwise specified, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature can be "below", "under" and "under" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0054] Unless otherwise specified, the test temperature of each parameter mentioned in the present disclosure is 25℃.

[0055] The secondary battery cell mentioned in the embodiments of the present disclosure can realize the function of charging and discharging independently, and can continue to be used by activating the active material through charging after discharging. The secondary battery cell can be in the shape of a cylinder, a cuboid or other shapes, which are not limited in the embodiments of the present disclosure. As shown in FIG. 1, the secondary battery cell 5 is a cuboid structure as an example.

[0056] The secondary battery cell provided by the embodiments of the present disclosure can include but is not limited to lithium battery cells, sodium battery cells, such as lithium ion battery cells, sodium ion battery cells, lithium metal battery cells, sodium metal battery cells, etc.

[0057] Embodiments of the present disclosure provide a secondary battery cell including an electrode assembly. The electrode assembly can be in a jelly-roll structure or in a stacked structure, and the present disclosure is not limited in this regard. The secondary battery cell further includes an outer package that can be used to encapsulate the electrode assembly. The outer package can be a hard case, such as a hard plastic case, an aluminum case, a steel case, etc. The outer package can also be a soft package, such as a pouch-type soft package. The soft package can be made of plastic, such as one or more of an aluminum-plastic film, polypropylene, polybutylene terephthalate (PBT), and polybutylene succinate (PBS).

[0058] A battery apparatus as referred to in embodiments of the present disclosure can include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly can include a plurality of secondary battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0059] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of secondary battery cells.

[0060] As an example, a battery cell assembly can be a battery module formed by arranging and fixing a plurality of secondary battery cells into one independent module. As an example, a battery module can be formed by bundling a plurality of secondary battery cells with a cable tie.

[0061] In some embodiments, a battery apparatus can be a battery pack including a case and one or more battery cell assemblies housed in the case.

[0062] As an example, a battery cell assembly can be a battery module, and the battery cell assembly can be housed in the case by fixing the battery module in the case.

[0063] As an example, a battery cell assembly can also be housed in the case by directly fixing a plurality of secondary battery cells in the case.

[0064] As an example, the case can include a first case and a second case. The first case and the second case are coupled so that an enclosed space is formed inside the case to receive the battery cell assembly. Here, enclosed means covered or closed, and can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0065] As an example, the case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively coupled to the frame so that an enclosed space is formed inside the case to receive the battery cell assembly.

[0066] In some embodiments, the box can be part of a chassis structure of the vehicle. For example, portions of the box can become at least part of a floor of the vehicle, or portions of the box can become at least part of cross beams and longitudinal beams of the vehicle.

[0067] The technical solutions described in the embodiments of the present disclosure are applicable to various electric devices using secondary battery cells and battery devices, such as, but not limited to, mobile devices (such as mobile phones, tablets, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc. The secondary battery cells and battery devices are used to store or provide electric energy.

[0068] FIG. 2 is a schematic diagram of an electric device as an example. The electric device is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle, etc.

[0069] In the context of the present disclosure, the "organic particles" in the coating of the separator mainly play a role in improving heat resistance, and have little adhesion.

[0070] The separator is an important component for supporting the secondary battery cell to complete the electrochemical process of charging and discharging. Commonly used separators are mostly polyolefin materials, but such materials have a low glass transition temperature and will have a serious thermal shrinkage phenomenon after being heated. In order to improve the heat resistance of the separator, boehmite or alumina is commonly used as a heat-resistant filler and a binder to form a coating. Boehmite and alumina have a large density, and the mass of boehmite and alumina is greater than that of other materials under the same packing volume, thereby affecting the energy density of the secondary battery cell.

[0071] The embodiments of the present disclosure provide a separator which can make the secondary battery cell have high mass energy density, high reliability, and good high-temperature performance.

[0072] The separator provided by the embodiments of the present disclosure includes a porous base film and a coating on at least one side of the porous base film, and the coating includes organic particles and a binder. The organic particles have no glass transition temperature below 300°C.

[0073] The porous base film and the coating both have a pore structure, so that the separator has good air permeability and facilitates the passage of ions. The organic particles in the coating are connected to each other and fixed by the binder, and the gaps between the organic particles can form a pore structure.

[0074] The organic particles have a small density, and a secondary battery cell using the same can have a higher mass energy density. The organic particles of the present disclosure have no glass transition temperature below 300°C, indicating that the organic particles have good heat resistance and thermal stability. By locating the organic particles on the porous base film, the organic particles can generate a force that resists thermal contraction of the porous base film, thereby improving the overall thermal contraction of the separator film, improving the heat resistance of the separator film, and improving the reliability of the secondary battery cell. In addition, the organic particles of the present disclosure have good stability in a high-temperature environment, and can also provide a secondary battery cell with good high-temperature performance. Therefore, a secondary battery cell using the separator film provided by the embodiments of the present disclosure can have high mass energy density, high reliability, and good high-temperature performance.

[0075] The glass transition temperature T g The test can be performed as follows: take an appropriate amount of sample (e.g., 5-15 mg) and place it in a differential scanning calorimeter (DSC) crucible, shake it flat, and cover it with a crucible cover; parameter settings: nitrogen atmosphere, purge gas 60 mL / min, protective gas 20 mL / min; program settings: temperature increase from 25°C to 200°C at a rate of 10°C / min, hold for 5 min to eliminate thermal history, temperature decrease from 200°C to -40°C at a rate of 10°C / min, and temperature increase from -40°C to 300°C at a rate of 10°C / min. Determine whether the organic particles have a glass transition temperature T g .

[0076] The glass transition temperature T g refers to the transition temperature from a glassy state to a high-elastic state, which shows a step change on the DSC curve.

[0077] The organic particles have no glass transition temperature T g below 300°C, which means that the DSC curve of the organic particles shows no step change in the range below 300°C.

[0078] In some embodiments, the true density of the organic particles can be 1.0 g / cm 3 -2.0 g / cm 3 . Alternatively, the true density of the organic particles can be 1.0 g / cm 3 -1.8 g / cm 3 .

[0079] At present, the true density of inorganic particles such as boehmite and alumina is usually 2.5 g / cm 3 -3.5 g / cm 3 . The true density of the organic particles of the present disclosure is small, thereby enabling a secondary battery cell using the separator film of the present disclosure to have a higher mass energy density.

[0080] In some embodiments, the organic particles have a volume distribution particle size Dv50 of less than 1 µm, optionally 50 nm to 800 nm, 86 nm to 800 nm.

[0081] The organic particles of the present disclosure are neither soluble in water nor in organic solvents such as tetrahydrofuran (THF), dichloromethane (DCM), dimethylformamide (DMF), trichlorobenzene (TCB), chloroform at 25°C, i.e. are insoluble in the mobile phase tested by gel permeation chromatography, nor can the molecular weight of the organic particles be tested by gel permeation chromatography.

[0082] The organic particles of the present disclosure are at least one of a thermosetting resin polymer or a crosslinked polymer.

[0083] A thermosetting resin polymer refers to a polymer product that irreversibly hardens upon curing and does not soften or melt upon heating once cured.

[0084] A crosslinked polymer refers to a polymer product obtained when crosslinking bonds are formed between monomer units.

[0085] The organic particles of the present disclosure are amorphous polymers.

[0086] In some embodiments, the organic particles can include one or more of a phenol-aldehyde resin-based organic particle, a polymer particle containing a triazine ring structure unit, a silicon-containing organic resin particle.

[0087] [Phenol-aldehyde resin-based organic particle]

[0088] In some embodiments, the phenol-aldehyde resin-based organic particle is a thermosetting resin polymer.

[0089] In some embodiments, the phenol-aldehyde resin-based organic particle is a thermosetting resol polymer.

[0090] The raw material of the phenol-aldehyde resin-based organic particle can include a phenolic compound and an aldehyde compound. In some embodiments, the phenolic compound can include one or more of phenol, p-phenol, m-phenol, o-phenol, cresol, and cardanol. In some embodiments, the aldehyde compound can include one or more of formaldehyde, paraformaldehyde, acetaldehyde, propyl aldehyde, n-butyl aldehyde, glyoxal, and furfural.

[0091] In some embodiments, the phenol-aldehyde resin-based organic particle has no melting point.

[0092] The phenol-aldehyde resin-based organic particle of the present disclosure has no melting point, indicating that the phenol-aldehyde resin-based organic particle has good heat resistance and thermal stability, thereby better resisting thermal shrinkage of the porous base film, improving the heat resistance of the separator film, and improving the reliability of the secondary battery cell.

[0093] In some embodiments, the phenolic resin-based organic particles can have a volume distribution particle size Dv50 of 160 nm-800 nm.

[0094] The volume distribution particle size Dv50 of the polymer particles of the phenolic resin-based organic particles in the above range is conducive to the isolation film having good heat resistance and air permeability.

[0095] The resol-based material generally has a low glass transition temperature and cannot meet the heat resistance requirement of the isolation film. Based on this, the present disclosure provides a phenolic resin-based organic particle which has no glass transition temperature below 300℃. The present disclosure also provides a method for preparing the phenolic resin-based organic particle.

[0096] In some embodiments, the method for preparing the phenolic resin-based organic particle comprises the following steps: providing a resol-based material; curing the resol-based material at a first temperature and in a first atmosphere for a first time, then curing the resol-based material at a second temperature and in a second atmosphere for a second time, and then crushing to obtain the phenolic resin-based organic particle. The first temperature is 90℃-165℃, and the second temperature is 190℃-275℃.

[0097] The phenolic resin-based organic particle prepared by the present disclosure is a thermosetting resol polymer.

[0098] The first temperature is 90℃-165℃, for example, it can be 90℃, 95℃, 100℃, 105℃, 110℃, 115℃, 120℃, 125℃, 130℃, 135℃, 140℃, 145℃, 150℃, 155℃, 160℃, 165℃, or a range consisting of any of the above values.

[0099] The first temperature in the above range can make the curing of the resol-based material in the first stage more uniform and sufficient, so that the phenolic resin-based organic particle with good heat resistance and no glass transition temperature below 300℃ can be obtained.

[0100] Alternatively, the first temperature can be 100℃-165℃, 110℃-165℃.

[0101] The first temperature in the above range can obtain the phenolic resin-based organic particle with better heat resistance.

[0102] The second temperature is 190℃-275℃, for example, it can be 190℃, 200℃, 205℃, 210℃, 215℃, 220℃, 225℃, 230℃, 235℃, 240℃, 245℃, 250℃, 255℃, 260℃, 265℃, 270℃, 275℃, or a range consisting of any of the above values.

[0103] The second temperature is in the above range, which can make the phenolic resin organic particles more fully cured, and obtain phenolic resin organic particles with good heat resistance and no glass transition temperature below 300°C.

[0104] Alternatively, the second temperature can be 200°C-275°C, 210°C-275°C, 215°C-275°C, 200°C-270°C, 210°C-270°C, 215°C-270°C.

[0105] The second temperature is in the above range, which can obtain phenolic resin organic particles with better heat resistance.

[0106] In some embodiments, the first time can be 1h-4h, for example, it can be 1h, 1.2h, 1.4h, 1.6h, 1.8h, 2h, 2.2h, 2.4h, 2.6h, 2.8h, 3h, 3.2h, 3.4h, 3.6h, 3.8h, 4h, or a range consisting of any of the above values.

[0107] The first time is in the above range, which can make the resol phenolic resin material more uniformly and fully cured in the first stage, and thus can obtain phenolic resin organic particles with better heat resistance.

[0108] In some embodiments, the second time can be 1h-5h, for example, it can be 1h, 1.2h, 1.4h, 1.6h, 1.8h, 2h, 2.2h, 2.4h, 2.6h, 2.8h, 3h, 3.2h, 3.4h, 3.6h, 3.8h, 4h, 4.2h, 4.4h, 4.6h, 4.8h, 5h, or a range consisting of any of the above values.

[0109] The second time is in the above range, which can make the phenolic resin organic particles more fully cured, and obtain phenolic resin organic particles with better heat resistance.

[0110] In some embodiments, the first atmosphere can be an inert gas atmosphere or an oxygen-containing atmosphere. The oxygen-containing atmosphere can include oxygen and an inert gas. Alternatively, the volume fraction of oxygen in the oxygen-containing atmosphere can be 5%-50%. Alternatively, the inert gas can include, but is not limited to, one or more of nitrogen, argon, and helium.

[0111] Alternatively, the first atmosphere is an oxygen-containing atmosphere, and the volume fraction of oxygen in the oxygen-containing atmosphere can be 10%-30%. More alternatively, the first atmosphere can be an air atmosphere.

[0112] In some embodiments, the second atmosphere can be an inert gas atmosphere or an oxygen-containing atmosphere. The oxygen-containing atmosphere can include oxygen and an inert gas. Optionally, the volume fraction of oxygen in the oxygen-containing atmosphere can be 5-50%. Optionally, the inert gas can include, but is not limited to, one or more of nitrogen, argon, helium.

[0113] Optionally, the second atmosphere is an oxygen-containing atmosphere, and the volume fraction of oxygen in the oxygen-containing atmosphere can be 10-30%. More optionally, the second atmosphere can be an air atmosphere.

[0114] In some embodiments, the method for preparing the phenolic resin-based organic particles can further include a sieving treatment and a magnetic removal treatment after the crushing treatment.

[0115] The resol resin-based material can be commercially available or synthesized according to a method known in the art. In some embodiments, the method for preparing the resol resin-based material includes a step of reacting a phenolic compound and an aldehyde compound under catalysis of an alkaline substance to obtain the resol resin-based material.

[0116] Optionally, the alkaline substance can include one or more of ammonia, NaOH, Na2CO3.

[0117] Optionally, the phenolic compound can include one or more of phenol, p-dihydroxybenzene, m-dihydroxybenzene, o-dihydroxybenzene, cresol, cardanol.

[0118] Optionally, the aldehyde compound can include one or more of formaldehyde, paraformaldehyde, acetaldehyde, propyl aldehyde, n-butyl aldehyde, glyoxal, and furfural.

[0119] [Polymer particles containing triazine ring structural units]

[0120] The polymer particles containing triazine ring structural units of the present disclosure further include a bridging structure connecting the triazine ring structural units.

[0121] The polymer particles containing triazine ring structural units contain a plurality of triazine ring structural units in the molecular structure, and the bridging structure refers to a group connecting the triazine ring structural units, each bridging structure being the same or different.

[0122] Optionally, the bridging structure can include one or a combination of two or more of an alkylene group, an alkylene ether group, an alkylene amine group, an ester group, and an amide group.

[0123] More optionally, the bridging structure can include one or a combination of two or more of a methylene group, a methylene ether group, and a methylene amine group.

[0124] In some embodiments, the triazine ring structural units of the polymeric particles containing triazine ring structural units can further have substituents thereon, which can include one or more of a combination of alkyl, alkenyl, phenyl, cycloalkyl, amine, hydroxyl, halogen.

[0125] In some embodiments, the polymeric particles containing triazine ring structural units can include at least one of melamine formaldehyde polymers and derivatives thereof, etherified melamine formaldehyde polymers and derivatives thereof, etherified melamine formaldehyde-polyol polymers and derivatives thereof, etherified melamine formaldehyde-polybasic acid polymers and derivatives thereof, etherified melamine formaldehyde-polyamine amide polymers and derivatives thereof.

[0126] In some embodiments, the melamine formaldehyde polymers and derivatives thereof can include melamine formaldehyde polymers and derivatives thereof.

[0127] Optionally, the melamine formaldehyde polymers and derivatives thereof can include one or more of melamine formaldehyde, phenylated melamine formaldehyde, melamine-phenylated melamine formaldehyde, melamine-(2,4-diamino-1,3,5-triazine) formaldehyde, melamine-(6-methyl-1,3,5-triazine-2,4-diamine) formaldehyde, melamine-(2,4,6-triethylamino-1,3,5-triazine) formaldehyde, trihydrazinyl-s-triazine formaldehyde, melamine-(2-amino-4-methylamino-1,3,5-triazine) formaldehyde, melamine-(2,4-diamino-6-dimethylamino-1,3,5-triazine) formaldehyde.

[0128] In some embodiments, the etherified melamine formaldehyde polymers and derivatives thereof can include etherified melamine formaldehyde polymers and derivatives thereof.

[0129] In some embodiments, the etherified melamine formaldehyde polymers and derivatives thereof can include methyl etherified melamine formaldehyde polymers and derivatives thereof, ethyl etherified melamine formaldehyde polymers and derivatives thereof, butyl etherified melamine formaldehyde polymers and derivatives thereof, methyl-butyl mixed etherified melamine formaldehyde polymers and derivatives thereof.

[0130] Optionally, the etherified melamine formaldehyde polymers and derivatives thereof can include methyl etherified melamine formaldehyde polymers and derivatives thereof, ethyl etherified melamine formaldehyde polymers and derivatives thereof, butyl etherified melamine formaldehyde polymers and derivatives thereof, methyl-butyl mixed etherified melamine formaldehyde polymers and derivatives thereof.

[0131] The etherified melamine formaldehyde polymer and its derivatives can include one or more of partially etherified melamine formaldehyde polymer and its derivatives, fully etherified melamine formaldehyde polymer and its derivatives. Alternatively, the etherified melamine formaldehyde polymer and its derivatives can include fully etherified melamine formaldehyde polymer and its derivatives.

[0132] In some embodiments, the etherified melamine formaldehyde polymer and its derivatives can include one or more of methyl etherified melamine formaldehyde, butyl etherified melamine formaldehyde, methyl etherified benzoguanamine formaldehyde, butyl etherified benzoguanamine formaldehyde.

[0133] The etherified melamine formaldehyde-polyol polymer and its derivatives refer to the product of high temperature cross-linking curing reaction of etherified melamine formaldehyde resin and polyol. Alternatively, the molar ratio of etherified melamine formaldehyde resin and polyol can be 1:2-1:6.

[0134] In some embodiments, the polyol can include one or more of dihydric alcohol, trihydric alcohol, tetrahydric alcohol. Alternatively, the polyol can include one or more of ethylene glycol, 1,2-propanediol, 1,4-butanediol, neopentyl glycol, hexanediol, ethyl butyl propylene glycol, glycerol, trimethylolpropane, pentaerythritol, polyvinyl alcohol, polyester polyol, polyether polyol. More alternatively, the polyol can include one or more of ethylene glycol, 1,2-propanediol, 1,4-butanediol, polyvinyl alcohol, polyester polyol.

[0135] Alternatively, the polyester polyol can include one or more of polyethylene glycol adipate diol, poly-1,4-butanediol adipate diol, polypropylene glycol adipate diol, polyneopentyl glycol adipate diol, polyneopentyl glycol-1,6-hexanediol adipate diol, polyhexanediol adipate diol, polycarbonate diol, polycaprolactone diol.

[0136] Alternatively, the polyether polyol can include one or more of polypropylene oxide diol, polypropylene oxide triol, polytetrahydrofuran diol.

[0137] Alternatively, the molecular weight of the polyester polyol can be below 5000, optionally below 2000.

[0138] Alternatively, the molecular weight of the polyether polyol can be below 5000, optionally below 2000.

[0139] Alternatively, the molecular weight of the polyvinyl alcohol can be below 5000, optionally below 2000.

[0140] In some embodiments, the etherified melamine formaldehyde-polyol polymer and derivatives thereof can include one or more of a methyl etherified melamine formaldehyde-ethylene glycol polymer, a methyl etherified melamine formaldehyde-1,2-propanediol polymer, a methyl etherified melamine formaldehyde-1,4-butanediol polymer, a methyl etherified melamine formaldehyde-polyester polyol polymer, a methyl etherified melamine formaldehyde-polyvinyl alcohol polymer, a butyl etherified melamine formaldehyde-ethylene glycol polymer, a butyl etherified melamine formaldehyde-1,2-propanediol polymer, a butyl etherified melamine formaldehyde-1,4-butanediol polymer, a butyl etherified melamine formaldehyde-polyester polyol polymer.

[0141] The etherified melamine formaldehyde-polybasic acid polymer and derivatives thereof refer to the high-temperature crosslinking and curing reaction product of the etherified melamine formaldehyde resin and the polybasic acid. Optionally, the molar ratio of the etherified melamine formaldehyde resin to the polybasic acid can be 1:2-1:6.

[0142] In some embodiments, the polybasic acid can include one or more of a dibasic acid, a tribasic acid, a tetrabasic acid. Optionally, the polybasic acid can include one or more of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, citric acid, tartaric acid, phthalic acid, isophthalic acid, terephthalic acid, pyromellitic acid, phthalic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, maleic anhydride, 1,4-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid. More optionally, the polybasic acid can include one or more of oxalic acid, malonic acid, succinic acid, citric acid, phthalic acid, terephthalic acid.

[0143] In some embodiments, the etherified melamine formaldehyde-polybasic acid polymer and derivatives thereof can include one or more of a methyl etherified melamine formaldehyde-oxalic acid polymer, a methyl etherified melamine formaldehyde-malonic acid polymer, a methyl etherified melamine formaldehyde-succinic acid polymer, a methyl etherified melamine formaldehyde-citric acid polymer, a methyl etherified melamine formaldehyde-terephthalic acid polymer, a methyl etherified melamine formaldehyde-phthalic acid polymer, a butyl etherified melamine formaldehyde-oxalic acid polymer, a butyl etherified melamine formaldehyde-malonic acid polymer, a butyl etherified melamine formaldehyde-citric acid polymer, a butyl etherified melamine formaldehyde-terephthalic acid polymer, a butyl etherified melamine formaldehyde-phthalic acid polymer.

[0144] The etherified melamine formaldehyde-polybasic amide polymer and derivatives thereof refer to the high-temperature crosslinking and curing reaction product of the etherified melamine formaldehyde resin and the polybasic amide. Optionally, the molar ratio of the etherified melamine formaldehyde resin to the polybasic amide can be 1:2-1:6.

[0145] In some embodiments, the polybasic amide can include one or more of oxamide, malonamide, succinamide, adipamide, isophthalic imide. Alternatively, the polybasic amide can include one or more of oxamide, malonamide, isophthalic imide.

[0146] In some embodiments, the etherified melamine formaldehyde-polyamine amide polymer and derivatives thereof can include one or more of methyl etherified melamine formaldehyde-oxamide polymer, methyl etherified melamine formaldehyde-malonamide polymer, methyl etherified melamine formaldehyde-isophthalic imide polymer, butyl etherified melamine formaldehyde-oxamide polymer.

[0147] In some embodiments, the volume distribution particle size Dv50 of the polymer particles containing triazine ring structural units can be 160 nm-800 nm.

[0148] The volume distribution particle size Dv50 of the polymer particles containing triazine ring structural units within the above range is advantageous for the barrier film to have good heat resistance and air permeability.

[0149] The present disclosure provides a polymer particle containing triazine ring structural units, which has no glass transition temperature below 300℃. The present disclosure also provides a method for preparing the polymer particle containing triazine ring structural units.

[0150] In some embodiments, the method for preparing the polymer particles containing triazine ring structural units includes the following steps: providing a precursor containing triazine ring structure; heating and curing the precursor containing triazine ring structure in an oxygen-containing atmosphere, and then crushing to obtain the polymer particles containing triazine ring structural units, the heating and curing temperature being 170℃-260℃. After heating and curing of the precursor containing triazine ring structure, a bridging structure is formed between the triazine ring structural units.

[0151] The heating and curing temperature is 170℃-260℃, for example, it can be 170℃, 180℃, 185℃, 190℃, 195℃, 200℃, 205℃, 210℃, 215℃, 220℃, 225℃, 230℃, 235℃, 240℃, 245℃, 250℃, 255℃, 260℃, or a range consisting of any of the above values.

[0152] The heating and curing temperature is 170℃-260℃, which can obtain the polymer particles containing triazine ring structural units with good heat resistance and no glass transition temperature below 300℃.

[0153] Alternatively, the heating and curing temperature can be 190℃-260℃, 200℃-260℃, 210℃-260℃, 220℃-260℃, 230℃-260℃.

[0154] In some embodiments, the heating and curing time can be 1 h-6 h, for example, can be 1 h, 1.2 h, 1.4 h, 1.6 h, 1.8 h, 2 h, 2.2 h, 2.4 h, 2.6 h, 2.8 h, 3 h, 3.2 h, 3.4 h, 3.6 h, 3.8 h, 4 h, 4.2 h, 4.4 h, 4.6 h, 4.8 h, 5 h, 5.2 h, 5.4 h, 5.6 h, 5.8 h, 6 h, or a range consisting of any of the aforementioned values.

[0155] The heating and curing time in the above range is conducive to the formation of the polymer particles containing triazine ring structure units with better heat resistance from the resol resin containing triazine ring structure.

[0156] Optionally, the heating and curing time can be 2 h-6 h.

[0157] In some embodiments, the oxygen-containing atmosphere can include oxygen and an inert gas. Optionally, the inert gas can include, but is not limited to, one or more of nitrogen, argon, helium. In some embodiments, the volume fraction of oxygen in the oxygen-containing atmosphere can be 5%-50%. Optionally, the volume fraction of oxygen in the oxygen-containing atmosphere can be 10%-30%. More optionally, the oxygen-containing atmosphere can be an air atmosphere.

[0158] In some embodiments, the polymer particles containing triazine ring structure units can further include the steps of sieving and demagnetizing after the crushing treatment.

[0159] In some embodiments, the precursor containing triazine ring structure can include at least one of the following: melamine formaldehyde resin, etherified melamine formaldehyde resin, a mixture of etherified melamine formaldehyde resin and at least one of polyol, polycarboxylic acid, polyamide.

[0160] In some embodiments, the precursor containing triazine ring structure can include melamine formaldehyde resin, which can be obtained by reacting an aldehyde compound with an amine-substituted triazine compound, and the amine-substituted triazine compound can include melamine and / or melamine derivatives. Optionally, the molar ratio of the aldehyde compound to the amine-substituted triazine compound can be 1.7:1-2.7:1, for example, can be 1.7:1, 1.8:1, 1.9:1, 2:1, 2.1:1, 2.2:1, 2.3:1, 2.4:1, 2.5:1, 2.6:1, 2.7:1, or a range consisting of any of the aforementioned values. More optionally, the molar ratio of the aldehyde compound to the amine-substituted triazine compound can be 2:1-2.7:1, 2.1:1-2.7:1, 2.2:1-2.7:1, 2.3:1-2.7:1.

[0161] In some embodiments, the precursor containing a triazine ring structure can include an etherified melamine-aldehyde resin, which can be obtained by reacting an aldehyde compound, an amine-substituted triazine compound, and an alcohol compound, the amine-substituted triazine compound can include melamine and / or melamine derivatives. Optionally, the molar ratio of the aldehyde compound to the amine-substituted triazine compound can be 4: 1-6.5: 1, for example, can be 4: 1, 4.5: 1, 5: 1, 5.5: 1, 6: 1, 6.5: 1, or a range consisting of any of the foregoing. More optionally, the molar ratio of the aldehyde compound to the amine-substituted triazine compound can be 5: 1-6.5: 1, 5.5: 1-6.5: 1, 6: 1-6.5: 1.

[0162] In some embodiments, the precursor containing a triazine ring structure includes a mixture of an etherified melamine-aldehyde resin and a polyol, the molar ratio of the etherified melamine-aldehyde resin to the polyol can be 1:2-1:6.

[0163] In some embodiments, the precursor containing a triazine ring structure includes a mixture of an etherified melamine-aldehyde resin and a polyol, the molar ratio of the etherified melamine-aldehyde resin to the polyol can be 1:2-1:6.

[0164] In some embodiments, the precursor containing a triazine ring structure includes a mixture of an etherified melamine-aldehyde resin and a polyol, the molar ratio of the etherified melamine-aldehyde resin to the polyol can be 1:2-1:6.

[0165] In some embodiments, the alcohol compound forming the etherified melamine-aldehyde resin can include one or more of methanol, ethanol, butanol.

[0166] In some embodiments, the aldehyde compound forming the melamine-aldehyde resin and the etherified melamine-aldehyde resin can include one or more of formaldehyde, paraformaldehyde, acetaldehyde, propionaldehyde, n-butyraldehyde, glyoxal, and furfural.

[0167] In some embodiments, the amine-substituted triazine compound forming the melamine-aldehyde resin and the etherified melamine-aldehyde resin can include one or more of the following general compounds, R1, R2are each independently selected from any one of H, -NH2, C1-C8 alkyl, R3is selected from any one of H, -NH2, -NHR4, C1-C8 alkyl, C2-C8 alkenyl, phenyl, C7-C12 alkylphenyl, C7-C12 phenylalkyl, C5-C8 cycloalkyl, R4is selected from any one of -NH2, C1-C8 alkyl. Optionally, R3is selected from -NH2or -NHR4.

[0168] Optionally, the amine-substituted triazine compound can include one or more of melamine, benzoguanamine, 2,4-diamino-1,3,5-triazine, 6-methyl-1,3,5-triazine-2,4-diamine, 2,4,6-triethylamino-1,3,5-triazine, trihydrazinotriazine, 2-amino-4-methylamino-1,3,5-triazine, 2,4-diamino-6-dimethylamino-1,3,5-triazine, 6-ethyl-1,3,5-triazine-2,4-diamine, 6-isopropyl-1,3,5-triazine-2,4-diamine, 6-pentyl-2,4-diamino-1,3,5-triazine, 6-heptyl-2,4-diamino-triazine, 2-vinyl-4,6-diamino-1,3,5-triazine, 2,4-diamino-6-(4-methylphenyl)-1,3,5-triazine, 6-cyclohexyl-1,3,5-triazine-2,4-diamine, 6-(3-methylphenyl)-1,3,5-triazine-2,4-diamine, 6-o-tolyl-1,3,5-triazine-2,4-diamine, 6-(2,4-dimethylphenyl)-1,3,5-triazine-2,4-diamine, 6-phenylmethyl-1,3,5-triazine-2,4-diamine, (diamino-1,3,5-triazin-2-yl)methanol, 2-chloro-4,6-diamino-1,3,5-triazine.

[0169] More optionally, the amine-substituted triazine compound can include one or more of melamine, benzoguanamine, 2,4-diamino-1,3,5-triazine, 6-methyl-1,3,5-triazine-2,4-diamine, 2,4,6-triethylamino-1,3,5-triazine, trihydrazinotriazine, 2-amino-4-methylamino-1,3,5-triazine, 2,4-diamino-6-dimethylamino-1,3,5-triazine.

[0170] The etherified melamine aldehyde resin can include one or more of a partially etherified melamine aldehyde resin, a fully etherified melamine aldehyde resin. Optionally, the etherified melamine aldehyde resin can include a fully etherified melamine aldehyde resin.

[0171] In some embodiments, the etherified melamine aldehyde resin can include a methyl etherified melamine aldehyde resin, an ethyl etherified melamine aldehyde resin, a butyl etherified melamine aldehyde resin, a methyl butyl mixed etherified melamine aldehyde resin.

[0172] Optionally, the etherified melamine aldehyde resin can include one or more of a methyl etherified melamine formaldehyde resin, a butyl etherified melamine formaldehyde resin, a methyl etherified benzoguanamine formaldehyde resin, a butyl etherified benzoguanamine formaldehyde resin.

[0173] In some embodiments, the etherified melamine aldehyde resin can be in a liquid state.

[0174] [Silicon-containing organic resin particles]

[0175] In some embodiments, the silicon-containing organic resin particles are silicon-containing organic crosslinked resin particles, and the silicon-containing organic resin particles contain carbon-carbon bonds and siloxane structures.

[0176] Optionally, the silicon-containing organic resin particles are network structures formed with carbon-carbon bonds as the main chain, and the side chains contain siloxane structures.

[0177] Optionally, the silicon-containing organic resin particles are network structures formed with carbon-carbon bonds as the main chain, and the side chains contain siloxane structures and benzene ring structures.

[0178] In some embodiments, the silicon-containing organic crosslinked resin particles include crosslinking structure units. The crosslinking structure units of the silicon-containing organic crosslinked resin particles refer to non-silicon structure units for connecting the silicon-containing structure units.

[0179] Optionally, the crosslinking structure units can include one or more of divinylbenzene structure units, diethylene glycol divinyl ether structure units, triethylene glycol divinyl ether structure units, maleic acid diallyl ester structure units, ethylene glycol dimethacrylate structure units, 1,4-butanediol diacrylate structure units, 1,6-hexanediol diacrylate structure units, 1,8-octanediol diacrylate structure units, trimethylolpropane triacrylate structure units, pentaerythritol trimethacrylate structure units, tetraethylene glycol dimethacrylate structure units, tripropylene glycol diacrylate structure units, 2,2,4-trimethyladipoyl bis[2-ethylaziridine] structure units, 1,1-sebacoyl bis[2-methylaziridine] structure units, 1,1-(1,3-phenylenedicarbonyl) bis[2-methylaziridine] structure units, trimethylolpropane tris(2-methyl-1-aziridinyl propionate) structure units, trimethylolpropane-tris[3-(2-methylaziridinyl) propionate] structure units, pentaerythritol tris(3-aziridinyl) propionate structure units.

[0180] The raw material of the silicon-containing organic resin particle can include a monomer and a crosslinking agent, the monomer can include a silane coupling agent containing an alkenyl group and / or an acryloxy group. The crosslinking agent forms a crosslinking structural unit of the silicon-containing organic crosslinked resin particle after polymerization with the monomer. In some embodiments, the crosslinking agent can be a multifunctional crosslinking agent. Alternatively, the crosslinking agent can include one or more of divinylbenzene, diethylene glycol divinyl ether, triethylene glycol divinyl ether, diallyl maleate, ethylene glycol dimethacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,8-octanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol trimethacrylate, tetraethylene glycol dimethacrylate, tripropyleneglycol diacrylate, 2,2,4-trimethylhexanedioic acid bis[2-ethylaziridine], 1,1-nonanedioic acid bis[2-methylaziridine], 1,1-(1,3-phenylenedicarbonyl)bis[2-methylaziridine], trimethylolpropane tris(2-methyl-1-aziridinyl propionate), trimethylolpropane-tris[3-(2-methylaziridinyl)propionate], pentaerythritol tri(3-aziridinyl)propionate. In some embodiments, the monomer can include a vinyl silane coupling agent and / or an acryloxy silane coupling agent.

[0181] In some embodiments, the silicon-containing organic resin particle has no melting point.

[0182] The silicon-containing organic resin particle of the present disclosure has no melting point, which indicates that the silicon-containing organic resin particle has good heat resistance and thermal stability, and thus can better resist thermal shrinkage of the porous base film, improve the heat resistance of the separator film, and improve the reliability of the secondary battery cell.

[0183] In some embodiments, the volume distribution particle size Dv50 of the silicon-containing organic resin particle can be 86 nm-310 nm.

[0184] The volume distribution particle size Dv50 of the silicon-containing organic resin particle is within the above range, which is beneficial to the separator film having good heat resistance and air permeability.

[0185] The present disclosure provides a silicon-containing organic resin particle having no glass transition temperature below 300°C. The present disclosure also provides a method for preparing the silicon-containing organic resin particle.

[0186] In some embodiments, the method for preparing the silicon-containing organic resin particle includes the following steps: providing a pre-emulsion containing a monomer, a crosslinking agent, an emulsifier, an initiator, and water, and performing an emulsion polymerization reaction under the conditions of heating, inert gas protection, and stirring to obtain the silicon-containing organic resin particle. The monomer includes a silane coupling agent containing an alkenyl group and / or an acryloxy group. The mass fraction of the crosslinking agent is 3%-18% based on the total mass of the monomer and the crosslinking agent being 100%.

[0187] The monomer includes a silane coupling agent containing an alkenyl group and / or an acryloxy group, so that radicals are generated between the monomers to induce crosslinking reactions, and the monomers also crosslink with the crosslinking agent. Thus, a three-dimensional network structure of the silicon-containing organic resin particles can be formed using the monomer and the crosslinking agent of the present disclosure, which has a high heat resistance because it is not easily softened or deformed at high temperatures.

[0188] The mass fraction of the crosslinking agent can be 3% to 18%, for example, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, or a range consisting of any of the foregoing values, based on 100% of the total mass of the monomer and the crosslinking agent.

[0189] The silicon-containing organic resin particles have a good heat resistance and no glass transition temperature below 300°C when the mass fraction of the crosslinking agent is in the above range.

[0190] Alternatively, the mass fraction of the crosslinking agent can be 4% to 16%, 5% to 16%, 6% to 16%, based on 100% of the total mass of the monomer and the crosslinking agent.

[0191] The heat resistance of the silicon-containing organic resin particles can be further improved when the mass fraction of the crosslinking agent is in the above range.

[0192] In some embodiments, the crosslinking agent can be a multifunctional crosslinking agent.

[0193] Alternatively, the crosslinking agent can include one or more of divinylbenzene, diethylene glycol divinyl ether, triethylene glycol divinyl ether, diallyl maleate, ethylene glycol dimethacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,8-octanediol diacrylate, trimethylolpropane triacrylate, pentaerythritol trimethacrylate, tetraethylene glycol dimethacrylate, tripropyleneglycol diacrylate, 2,2,4-trimethyladipylbis[2-ethylaziridine], 1,1-nonanedioylbis[2-methylaziridine], 1,1-(1,3-phenylenedicarbonyl)bis[2-methylaziridine], trimethylolpropane tris(2-methyl-1-aziridinylpropionate), trimethylolpropane-tris[3-(2-methylaziridinyl)propionate], pentaerythritol tris(3-aziridinyl)propionate.

[0194] In some embodiments, the monomer can include a vinyl silane coupling agent and / or an acryloxy silane coupling agent.

[0195] Optionally, the monomer can include one or more of gamma-methacryloxypropyl tris(trimethylsiloxy)silane, (3-acryloyloxypropyl)tris(trimethylsiloxy)silane, 3-methacryloxypropyltrimethoxysilane, acryloyloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, acryloyloxypropyltriethoxysilane, gamma-methacryloxypropyltriisopropoxysilane, 3-(acryloyloxy)propyltrimethoxysilane, 3-methacryloxypropyltri(methoxyethoxy)silane, vinyltrimethoxysilane, 7-octenyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, tri-t-butoxyvinylsilane, vinyltris(beta-methoxyethoxy)silane, ethylene tris[(l-methylethenyl)oxy]silane, vinyltris-t-butylperoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-acryloxypropylmethyldimethoxysilane, methacryloxypropyldimethylmethoxysilane, (3-acryloxy)dimethylmethoxysilane, 3-methacryloxypropyldimethylethoxysilane, diethylmethylvinylsilane, vinyl dimethyl ethoxysilane, methylvinyldiethoxysilane, vinylmethyldimethoxysilane, vinylmethyldiethoxysilane, methylvinyldimethoxysilane, 3-(methacryloxy)propylmethyldiethoxysilane.

[0196] In some embodiments, the monomer can include a first monomer and a second monomer.

[0197] The first monomer can include one or more of gamma-methacryloxypropyl tris(trimethylsiloxy)silane, (3-acryloyloxypropyl)tris(trimethylsiloxy)silane, 3-methacryloxypropyltrimethoxysilane, acryloyloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, acryloyloxypropyltriethoxysilane, gamma-methacryloxypropyltriisopropoxysilane, 3-(acryloyloxy)propyltrimethoxysilane, 3-methacryloxypropyltri(methoxyethoxy)silane, vinyltrimethoxysilane, 7-octenyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, tri-t-butoxyvinylsilane, vinyltris(beta-methoxyethoxy)silane, ethylene tris[(l-methylethenyl)oxy]silane, vinyltris-t-butylperoxysilane.

[0198] The second monomer can include one or more of 3-methacryloxypropylmethyldimethoxysilane, 3-acryloxypropylmethyldimethoxysilane, methacryloxypropyldimethylmethoxysilane, (3-acryloxy)dimethylmethoxysilane, 3-methacryloxypropyldimethylethoxysilane, diethylmethylvinylsilane, vinyl dimethyl ethoxy silane, methyl vinyl diethoxy silane, vinyl methyl dimethoxy silane, vinyl methyl diethoxy silane, methyl vinyl dimethoxy silane, 3-(methacryloxy)propylmethyldiethoxysilane.

[0199] The first monomer and the second monomer are different in activity, and by matching the two and reacting with the crosslinking agent, the silicon-containing organic resin particles with narrow particle size distribution can be obtained.

[0200] In some embodiments, the emulsifier can include, but is not limited to, one or more of alkyl sulfate, alkyl sulfonate, Tween emulsifier, fatty alcohol polyoxyethylene ether, fatty alcohol polyoxypropylene ether, cetyl stearyl alcohol polyether, oleyl ether.

[0201] Optionally, the emulsifier can include one or more of sodium dodecyl sulfate, sodium dodecyl sulfonate, Tween 20, Tween 40, laureth-7, laureth-9, laureth-10, oleyl ether-10.

[0202] In some embodiments, the initiator can include, but is not limited to, one or more of sodium persulfate, potassium persulfate, ammonium persulfate, sodium sulfite, sodium bisulfite, azobisisobutyronitrile, azobis isobutyl imidazole hydrochloride, azobis isobutyl imidazole hydrochloride, azobis isopropyl imidazole.

[0203] In some embodiments, the heating temperature of the maturation stage of the emulsion polymerization reaction can be 75-85°C, for example, can be 75°C, 76°C, 77°C, 78°C, 79°C, 80°C, 81°C, 82°C, 83°C, 84°C, 85°C, or a range consisting of any of the above values.

[0204] In some embodiments, the heating time of the maturation stage of the emulsion polymerization reaction can be 1-3.5h, for example, can be 1h, 1.2h, 1.4h, 1.6h, 1.8h, 2h, 2.2h, 2.4h, 2.6h, 2.8h, 3h, 3.2h, 3.5h, or a range consisting of any of the above values.

[0205] In some embodiments, the emulsion polymerization reaction can include the following steps: under the conditions of the first heating temperature, inert gas protection and stirring, the pre-emulsion is added dropwise into the reactor containing water, after reacting for the first time, the temperature is raised to the heating temperature of the maturation stage for maturation reaction, to obtain the silicon-containing organic resin particles.

[0206] Optionally, the first heating temperature can be 55-70℃.

[0207] Optionally, the first time can be 3-6h.

[0208] In some embodiments, the pre-emulsion can further include a pH adjuster. Optionally, the pH adjuster can include, but is not limited to, one or more of sodium bicarbonate, sodium hydroxide, ammonia, etc.

[0209] In some embodiments, the method of preparing the silicon-containing organic resin particles further includes a step of magnetic removal after the emulsion polymerization reaction is completed.

[0210] In some embodiments, the mass content of the organic particles in the coating can be 50-99% based on the total mass of the coating.

[0211] Optionally, the mass content of the organic particles in the coating can be 60-99%, 70-99%, 80-99%, 85-99%, 88-99%, 80-97%, 85-97%, 88-97%, 80-95%, 85-95%, 88-95%.

[0212] In some embodiments, the binder in the coating can include, but is not limited to, one or more of polyacrylate-based binders, nitrile rubber-based binders, polyacrylic acid, polymethacrylic acid, sodium polyacrylate, polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), and carboxymethyl chitosan (CMCS).

[0213] In some embodiments, the coating can further include a dispersant, such as can include, but is not limited to, a polyacrylate dispersant or a carboxymethyl cellulose dispersant. As an example, the dispersant can include, but is not limited to, one or more of sodium carboxymethyl cellulose, sodium polyacrylate, ammonium polyacrylate.

[0214] In some embodiments, the release film can further include polymer binder particles. The "polymer binder particles" function to improve the adhesion of the release film to the pole piece in the release film, and have substantially no high-temperature resistance.

[0215] In some embodiments, the polymer binder particles can be embedded in the organic particles and form protrusions on the surface of the coating.

[0216] In other embodiments, the coating of the release film includes a heat-resistant layer disposed on the porous base film and a bonding layer disposed on at least a portion of the surface of the heat-resistant layer away from the porous base film, the organic particles are disposed in the heat-resistant layer, and the polymer binder particles are disposed in the bonding layer.

[0217] In yet some embodiments, the coating of the release film comprises a heat-resistant layer and an adhesive layer, the heat-resistant layer is disposed on one side of the porous base film, the adhesive layer is disposed on at least a portion of the surface of the other side of the porous base film, the organic particles are disposed in the heat-resistant layer, and the polymeric binder particles are disposed in the adhesive layer.

[0218] In some embodiments, the average particle size of the polymeric binder particles can be 6 μm to 18 μm.

[0219] The average particle size of the particles to be measured can be tested according to the following method: using a scanning electron microscope according to JY / T010-1996, obtaining a SEM image of the release film, randomly selecting a test sample with a length of 50 mm and a width of 100 mm on the release film, randomly selecting a plurality of test areas (for example, 5) in the test sample, and reading the particle size of the particles to be measured in each test area under a certain magnification (for example, more than 500 times); counting the number and particle size values of the particles to be measured in each test area, taking the arithmetic mean of the particle sizes of all the particles to be measured in each test area as the average particle size of the particles to be measured. In order to ensure the accuracy of the test results, a plurality of test samples (for example, 10) can be taken for the above test, and the average value of each test sample is taken as the final test result. The test instrument can be ZEISS Sigma 300. It should be noted that when the particles to be measured are irregularly shaped, the distance between the two farthest points on the particles to be measured is taken as the particle size of the particles to be measured.

[0220] In some embodiments, the polymeric binder particles can comprise vinylidene fluoride-based polymer particles, such as polyvinylidene fluoride (PVDF) particles and / or copolymer particles of vinylidene fluoride monomers and comonomers.

[0221] The comonomer can comprise at least one of an olefin monomer, a fluorine-containing olefin monomer, a chlorine-containing olefin monomer, an acrylate monomer, an acrylic monomer, and a fluorine ether monomer.

[0222] Alternatively, the comonomer can comprise at least one of trifluoroethylene, chlorotrifluoroethylene, 1,2-difluoroethylene, tetrafluoroethylene, hexafluoropropylene, perfluoro(alkyl vinyl) ether (for example, perfluoro(methyl vinyl) ether, perfluoro(ethyl vinyl) ether, perfluoro(propyl vinyl) ether), perfluoro(1,3-dioxolane), and perfluoro(2,2-dimethyl-1,3-dioxolane).

[0223] In some embodiments, the thickness of the coating layer can be 0.5-5 μm. The thickness of the coating layer refers to the thickness of the coating layer on one side of the porous base film. Alternatively, the thickness of the coating layer can be 0.5-4 μm, 0.5-3 μm, 0.5-2 μm, 0.6-4 μm, 0.6-3 μm, 0.6-2 μm, 0.8-4 μm, 0.8-3 μm, 0.8-2 μm.

[0224] In some embodiments, the areal density of the coating layer can be 0.45 g / m 2 -5 g / m 2 .

[0225] In some embodiments, the porous base film can comprise a film or nonwoven web selected from any one or at least two of the following: polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyacetal, polyamide, polycarbonate, polyimide, polyether ether ketone, polyaryletherketone, polyetherimide, polyamideimide, polybenzimidazole, polyether sulfone, polyphenylene ether, cyclic olefin copolymer, polyphenylene sulfide, polyvinyl naphthalene.

[0226] The porous base film can be a single-layer film or a multi-layer composite film. When the porous base film is a multi-layer composite film, the materials of the layers can be the same or different.

[0227] In some embodiments, the thickness of the porous base film can be 4-12 μm, and optionally 4-9 μm.

[0228] In some embodiments, the porosity of the porous base film can be 25-60%, and optionally 28-50%.

[0229] In some embodiments, the ratio of the volume distribution particle size Dv50 of the organic particles to the average pore size of the porous base film can be greater than or equal to 1.1.

[0230] The volume distribution particle size Dv50 of the organic particles and the average pore size of the porous base film have the same unit, such as nm.

[0231] This can reduce the problem of pore blocking and improve the air permeability and ion conductivity of the separation film.

[0232] In some embodiments, the average pore size of the porous base film can be 25-82 nm.

[0233] The average pore size of the porous base film can be tested using a capillary porosimeter (bubble point method). An exemplary testing method is as follows: a circular sample with a diameter of 25 mm is taken and 3-5 drops of wetting liquid are dropped on it, and after the sample is completely wetted, it is placed in a mold, and then an inert gas (such as nitrogen) is used to press the wetting liquid in the pores of the sample to be tested, and the pressure and flow rate of the pressurized gas are inversely proportional to the pore size. By sampling and pressure and pore size conversion analysis through software, the average pore size of the sample to be tested is obtained. The testing instrument can be a CFP 1500 pore size analyzer from PMI, and the testing pressure can be 100 psi to 350 psi.

[0234] In some embodiments, the thickness of the separation film can be 5 μm-14 μm, optionally 5 μm-12 μm, 6 μm-12 μm. This is advantageous for improving the energy density of the secondary battery cell.

[0235] In some embodiments, the longitudinal (MD) heat shrinkage rate of the separation film can be less than or equal to 2.5% when heated at 130°C for 1 h.

[0236] In some embodiments, the transverse (TD) heat shrinkage rate of the separation film can be less than or equal to 2.5% when heated at 130°C for 1 h.

[0237] The melting point can be tested as follows: an appropriate amount of sample (e.g., 5 mg-15 mg) is placed in a differential scanning calorimeter (DSC) crucible, shaken to level, and covered with a crucible cover; parameter settings: nitrogen atmosphere, purge gas 60 mL / min, protective gas 20 mL / min; program settings: temperature increase from 25°C to 200°C at a rate of 10°C / min, hold for 5 min to eliminate thermal history, then temperature decrease from 200°C to -40°C at a rate of 10°C / min, then temperature increase from -40°C to 300°C at a rate of 10°C / min. The DSC curve is used to determine whether the organic particles have a melting point below 300°C.

[0238] No melting point of the organic particles means that the DSC curve of the organic particles has no melting peak.

[0239] Dv50 represents the particle size corresponding to the cumulative volume distribution percentage of 50%, which can be tested according to GB / T 19077-2016 using a laser particle size analyzer. During testing, a clean small beaker is taken and 1 g of the sample to be tested is added, 20 ml of deionized water is added, and ultrasonic treatment is performed at 53 KHz / 120 W for 5 min to ensure complete dispersion of the sample; the laser particle size analyzer is turned on, the light path system is cleaned, and the background is automatically tested; the ultrasonically treated sample solution is stirred to make it uniformly dispersed, and then placed in the sample cell as required, and the particle size is measured. The testing instrument can be a MasterSizer 3000 laser particle size analyzer.

[0240] It should be noted that the coating parameters of the above-mentioned separation membrane are the coating parameters of one side of the porous base film. When the coating is arranged on both sides of the porous base film, as long as the coating parameters of any one side meet the present disclosure, it is considered to fall within the protection scope of the present disclosure.

[0241] The separation membrane can be prepared according to methods known in the art.

[0242] In some embodiments, a slurry including organic particles and a binder can be coated on at least one side of the porous base film, and after drying, the separation membrane is obtained.

[0243] In some embodiments, the slurry can further include polymer binder particles, and after drying of the slurry, the polymer binder particles are embedded in the organic particles and form protrusions on the surface of the coating.

[0244] In some embodiments, the preparation method of the separation membrane can include the steps of: coating a heat-resistant layer slurry including organic particles and a binder on at least one side of the porous base film, and after drying, forming a heat-resistant layer; and coating an adhesive layer slurry including polymer binder particles and a binder on at least a part of the surface of the heat-resistant layer, and after drying, obtaining the separation membrane.

[0245] In some embodiments, the preparation method of the separation membrane can include the steps of: coating a heat-resistant slurry including organic particles and a binder on one side of the porous base film, and coating an adhesive layer slurry including polymer binder particles and a binder on at least a part of the surface of the other side of the porous base film, and after drying, obtaining the separation membrane.

[0246] In some embodiments, the solvent of the slurry can be water, for example, deionized water.

[0247] In some embodiments, the slurry can further include other components, for example, can further include dispersants and / or wetting agents, etc.

[0248] The embodiments of the present disclosure also provide a secondary battery cell. The secondary battery cell includes the separation membrane provided by the embodiments of the present disclosure. Thus, the secondary battery cell can have high quality energy density, high reliability, and good high temperature performance.

[0249] The secondary battery cell further includes a positive electrode sheet, a negative electrode sheet, and an electrolyte, and the separation membrane is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the separation membrane, and the negative electrode sheet can form an electrode assembly through a rolling process and / or a stacking process.

[0250] The secondary battery cell provided by the present disclosure can include but is not limited to a lithium battery cell, a sodium battery cell, etc., and the composition of the positive electrode sheet, the negative electrode sheet, and the electrolyte will be different for different types of secondary battery cells.

[0251] [Positive electrode sheet]

[0252] In some embodiments, the positive electrode tab can include a positive current collector and a positive film layer disposed on at least one surface of the positive current collector and including a positive active material. For example, the positive current collector has two surfaces opposite in the thickness direction of itself, and the positive film layer is disposed on either one or both of the two opposite surfaces of the positive current collector.

[0253] For example, the positive active material can include, but is not limited to, one or more of lithium transition metal oxides, lithium-containing phosphates, and modified compounds thereof. Examples of the lithium transition metal oxides can include, but are not limited to, one or more of lithium cobalt oxides, lithium nickel oxides, lithium manganese oxides, lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides, lithium nickel cobalt aluminum oxides, and modified compounds thereof. Examples of the lithium-containing phosphates can include, but are not limited to, one or more of lithium iron phosphate, a composite of lithium iron phosphate and carbon, lithium manganese phosphate, a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite of lithium manganese iron phosphate and carbon, and modified compounds thereof. In some embodiments, in order to further improve the energy density of the secondary battery cell, the positive active material can include one or more of lithium transition metal oxides of the general formula Li a Ni b Co c M d O e A f 0.8≤a≤1.2, 0.5≤b<1, 0<c<1, 0<d<1, 1≤e≤2, 0≤f≤1, M includes, but is not limited to, one or more of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti, and B, and A includes, but is not limited to, one or more of N, F, S, and Cl.

[0254] For example, the positive active material can include, but is not limited to, LiCoO2, LiNiO2, LiMnO2, LiMn2O4, LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2(NCM523), LiNi 0.6 Co 0.2 Mn 0.2 O2(NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2(NCM811), LiNi 0.85 Co 0.1 Al 0.05one or more of O2, LiFePO4, LiMnPO4.

[0255] The secondary battery cell will be accompanied by Li de-intercalation and consumption during charging and discharging process, and the molar content of Li is different when the secondary battery cell is discharged to different states. In the enumeration of the positive electrode active material in the present disclosure, the molar content of Li is the initial state of the material, i.e. the state before feeding, and the positive electrode active material is applied to the secondary battery cell, and after charging and discharging cycle, the molar content of Li will change. In the enumeration of the positive electrode active material in the present disclosure, the molar content of O is only the theoretical state value, and the lattice oxygen release will cause the change of the molar content of O, and the actual molar content of O will also appear floating.

[0256] Taking a sodium battery cell as an example, the positive electrode active material can include but is not limited to one or more of sodium-containing transition metal oxides, polyanion materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), prussian blue type materials. As an example, the positive electrode active material can include but is not limited to one or more of NaFeO2, NaCoO2, NaCrO2, NaMnO2, NaNiO2, NaNi 1 / 2 Ti 1 / 2 O2, NaNi 1 / 2 Mn 1 / 2 O2, Na 2 / 3 Fe 1 / 3 Mn 2 / 3 O2, NaNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2, NaFePO4, NaMnPO4, NaCoPO4, prussian blue type materials, and materials of general formula X p M’ q (PO4) r O x Y 3-x . In the general formula X p M’ q (PO4) r O x Y 3-x , 0 < p < 4, 0 < q < 2, 1 < r < 3, 0 < x < 2, X includes but is not limited to one or more of H + , Li + , Na + , K + and NH4 + , M’ is a transition metal cation, which can optionally include but is not limited to one or more of V, Ti, Mn, Fe, Co, Ni, Cu and Zn, and Y is a halide anion, which can optionally be one or more of F, Cl and Br.

[0257] The modifying compound of the positive electrode active material of each of the lithium battery cell and the sodium battery cell described above can be a doping modification and / or a surface coating modification to the positive electrode active material.

[0258] In some embodiments, the positive electrode film layer can further include a positive electrode conductive agent. As an example, the positive electrode conductive agent can include, but is not limited to, one or more of super-p carbon, conductive graphite, acetylene black, carbon black, ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0259] In some embodiments, the positive electrode film layer can further include a positive electrode binder. As an example, the positive electrode binder can include, but is not limited to, one or more of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), a vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, and a fluorine-containing acrylic resin.

[0260] In some embodiments, the positive electrode current collector can employ a metal foil or a composite current collector. As an example of the metal foil, an aluminum foil can be employed. The composite current collector can include a polymer material base layer and a metal material layer formed on at least one surface of the polymer material base layer. As an example, the metal material can include, but is not limited to, one or more of aluminum, an aluminum alloy, nickel, a nickel alloy, titanium, a titanium alloy, silver, and a silver alloy. As an example, the polymer material base layer can include, but is not limited to, one or more of polypropylene, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene, and polyethylene.

[0261] The positive electrode film layer is generally formed by coating a positive electrode slurry on a positive electrode current collector, drying, and cold-pressing. The positive electrode slurry is generally formed by dispersing and uniformly stirring a positive electrode active material, a positive electrode conductive agent, a positive electrode binder, and any other components in a solvent. The solvent can be N-methyl pyrrolidone (NMP), but is not limited thereto.

[0262] [Negative electrode tab]

[0263] In some embodiments, the negative electrode tab can include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector and including a negative electrode active material. For example, the negative electrode current collector has two surfaces opposite in the thickness direction of itself, and the negative electrode film layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0264] The negative active material can employ materials known in the art that are useful for secondary battery cells. As an example, the negative active material can include, but is not limited to, one or more of natural graphite, artificial graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based materials can include, but are not limited to, one or more of elemental silicon, silicon oxide, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy materials. The tin-based materials can include, but are not limited to, one or more of elemental tin, tin oxide, and tin alloy materials.

[0265] In some embodiments, the negative electrode film layer can further include a negative electrode conductive agent. As an example, the negative electrode conductive agent can include, but is not limited to, one or more of super P, conductive graphite, acetylene black, carbon black, ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0266] In some embodiments, the negative electrode film layer can further include a negative electrode binder. As an example, the negative electrode binder can include, but is not limited to, one or more of styrene butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resin (e.g., polyacrylic acid PAA, polymethylacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), and carboxymethyl chitosan (CMCS).

[0267] In some embodiments, the negative electrode film layer can further include other auxiliary agents. As an example, the other auxiliary agents can include thickening agents, such as sodium carboxymethyl cellulose (CMC), PTC thermistor materials, and the like.

[0268] In some embodiments, the negative electrode current collector can employ a metal foil or a composite current collector. As an example of a metal foil, a copper foil can be employed. The composite current collector can include a polymer material base layer and a metal material layer formed on at least one surface of the polymer material base layer. As an example, the metal material can include, but is not limited to, one or more of copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy. As an example, the polymer material base layer can include, but is not limited to, one or more of polypropylene, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene, and polyethylene.

[0269] The negative electrode film layer is typically formed by coating a negative electrode slurry on a negative electrode current collector, drying, and cold-pressing. The negative electrode slurry is typically formed by dispersing the negative active material, the negative electrode conductive agent, the negative electrode binder, and other optional auxiliary agents in a solvent and stirring uniformly. The solvent can be N-methyl pyrrolidone (NMP) or deionized water, but is not limited thereto.

[0270] The negative electrode tab does not exclude other additional functional layers in addition to the negative electrode film layer. For example, in some embodiments, the negative electrode tab also includes a conductive primer layer (e.g., composed of a conductive agent and a binder) sandwiched between the negative electrode current collector and the negative electrode film layer, disposed on the surface of the negative electrode current collector.

[0271] In some embodiments, the negative electrode tab can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, foamed carbon, etc. When the foamed metal is used as the negative electrode tab, the surface of the foamed metal can not be provided with a negative electrode active material, and of course can be provided with a negative electrode active material.

[0272] [Electrolyte]

[0273] The electrolyte plays a role in conducting ions between the positive electrode tab and the negative electrode tab.

[0274] In some embodiments, the electrolyte employs an electrolyte solution, which includes an electrolyte salt and an organic solvent.

[0275] Taking a lithium battery cell as an example, the electrolyte salt can include but is not limited to one or more of lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium hexafluoroarsenate (LiAsF6), lithium bisfluorosulfonylimide (LiFSI), lithium bis-trifluoromethanesulfonylimide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluorooxalate borate (LiDFOB), lithium difluorophosphate (LiPO2F2), lithium difluorodioxalate phosphate (LiDFOP), and lithium tetrafluorooxalate phosphate (LiTFOP).

[0276] Taking a sodium battery cell as an example, the electrolyte salt can include but is not limited to one or more of sodium hexafluorophosphate (NaPF6), sodium tetrafluoroborate (NaBF4), sodium perchlorate (NaClO4), sodium hexafluoroarsenate (NaAsF6), sodium bisfluorosulfonylimide (NaFSI), sodium bis-trifluoromethanesulfonylimide (NaTFSI), sodium trifluoromethanesulfonate (NaTFS), sodium difluorooxalate borate (NaDFOB), sodium difluorophosphate (NaPO2F2), sodium difluorodioxalate phosphate (NaDFOP), and sodium tetrafluorooxalate phosphate (NaTFOP).

[0277] In some embodiments, the organic solvent can include, but is not limited to, one or more of ethylene carbonate (EC), propylene carbonate (PC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butylene carbonate (BC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), sulfolane (SF), dimethyl sulfone (MSM), methyl ethyl sulfone (EMS), diethyl sulfone (ESE), ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, crown ether.

[0278] In some embodiments, an additive can also be included in the electrolyte. For example, the additive can include a negative electrode film-forming additive, can also include a positive electrode film-forming additive, and can also include an additive capable of improving certain performance of the secondary battery cell, such as an additive capable of improving overcharge performance, an additive capable of improving high-temperature performance, an additive capable of improving low-temperature performance, and the like.

[0279] Optionally, the additive can include one or more of fluoroethylene carbonate (FEC), vinylene carbonate (VC), 1,3-propane sultone (PS), and vinyl sulfate (DTD).

[0280] Methods for preparing secondary battery cells are well known. In some embodiments, a positive electrode sheet, a separator, a negative electrode sheet, and an electrolyte can be assembled to form a secondary battery cell. As an example, a positive electrode sheet, a separator, and a negative electrode sheet can be formed into an electrode assembly through a winding process and / or a stacking process, the electrode assembly can be placed in an outer package, an electrolyte described above can be injected after drying, and the secondary battery cell can be obtained after processes such as vacuum packaging, standing, and formation.

[0281] Embodiments

[0282] The following examples more specifically describe the disclosure disclosed in the present disclosure, and these examples are merely illustrative, as various modifications and changes will be apparent to those skilled in the art within the scope of the disclosure disclosed in the present disclosure. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on mass, and all reagents used in the examples are commercially available or synthesized according to conventional methods and used directly without further purification, and the instruments used in the examples are commercially available.

[0283] A commercially available phenol and formaldehyde-based resol resin material was placed in a curing oven, the atmosphere was set to air atmosphere, the temperature was set to 135°C, and the temperature was maintained for 3h. After the end of the curing, the temperature of the curing oven was increased to 225°C, and the temperature was maintained for 3h. After the end of the two curing, the cured phenol resin-based organic particles were taken out, and after being naturally cooled in the air, they were broken, sanded, sieved, and de-magnetized to obtain phenol resin-based organic particles 1-1#.

[0284] A commercially available phenol and formaldehyde-based resol resin material was placed in a curing oven, the atmosphere was set to air atmosphere, the temperature was set to 135°C, and the temperature was maintained for 3h. After the end of the curing, the temperature of the curing oven was increased to 255°C, and the temperature was maintained for 3h. After the end of the two curing, the cured phenol resin-based organic particles were taken out, and after being naturally cooled in the air, they were broken, sanded, sieved, and de-magnetized to obtain phenol resin-based organic particles 1-2#.

[0285] A commercially available phenol and formaldehyde-based resol resin material was placed in a curing oven, the atmosphere was set to air atmosphere, the temperature was set to 135°C, and the temperature was maintained for 3h. After the end of the curing, the temperature of the curing oven was increased to 275°C, and the temperature was maintained for 3h. After the end of the two curing, the cured phenol resin-based organic particles were taken out, and after being naturally cooled in the air, they were broken, sanded, sieved, and de-magnetized to obtain phenol resin-based organic particles 1-3#.

[0286] A commercially available phenol and formaldehyde-based resol resin material was placed in a curing oven, the atmosphere was set to air atmosphere, the temperature was set to 135°C, and the temperature was maintained for 3h. After the end of the curing, the cured phenol resin-based organic particles were taken out, and after being naturally cooled in the air, they were broken, sanded, sieved, and de-magnetized to obtain phenol resin-based organic particles D1-1#.

[0287] The above prepared organic particles 1-1# to 1-3# satisfy the following characteristics: the phenol resin-based organic particles have no glass transition temperature T g , which is a thermosetting resol resin polymer.

[0288] The organic particles D1-1# have a glass transition temperature T g .

[0289] Next, the above prepared organic particles were used in the isolation film to verify their influence on the performance of the isolation film and the secondary battery cell.

[0290] The isolation film preparation process is as follows.

[0291] A commercially available polyethylene microporous film with a thickness of 7 μm was used as the porous base film; the organic particles, the dispersant sodium carboxymethyl cellulose, and the binder polyacrylate prepared above were mixed uniformly in deionized water at a solid mass ratio of 90:2:8 to obtain a coating slurry; the coating slurry was uniformly coated on both surfaces of the porous base film, and the solvent was removed by drying to obtain a separator film. The coating thickness was 1.5 μm, and the thickness of the separator film was 10 μm.

[0292] The preparation process of the secondary battery cell is as follows.

[0293] The positive electrode active material LiNi 0.8 Co 0.1 Mn 0.1 O2, the positive electrode binder polyvinylidene fluoride (PVDF), and the positive electrode conductive agent carbon black were mixed in N-methyl pyrrolidone (NMP) at a mass ratio of 97:2:1, and the mixture was stirred uniformly to prepare a positive electrode slurry; the positive electrode slurry was uniformly coated on the positive electrode current collector aluminum foil, and then the positive electrode slurry was dried, cold-pressed, and cut to obtain a positive electrode sheet.

[0294] The negative electrode active material artificial graphite, the negative electrode conductive agent acetylene black, the negative electrode binder styrene-butadiene rubber (SBR), and the thickening agent sodium carboxymethyl cellulose were mixed in deionized water at a mass ratio of 96.0:1.5:1.5:1, and the mixture was stirred uniformly to prepare a negative electrode slurry; the negative electrode slurry was uniformly coated on the negative electrode current collector copper foil, and then the negative electrode slurry was dried, cold-pressed, and cut to obtain a negative electrode sheet.

[0295] At 25°C, ethylene carbonate (EC) and methyl ethyl carbonate (EMC) were mixed at a volume ratio of 3:7 to obtain a mixed solvent, and then LiPF6 and fluoroethylene carbonate (FEC) were dissolved in the mixed solvent to obtain an electrolyte. The concentration of LiPF6 was 1 mol / L. The mass fraction of FEC was 3%, based on the mass of the electrolyte.

[0296] The positive electrode sheet, the separator film, and the negative electrode sheet were stacked and wound in sequence, and then hot-pressed to form an electrode assembly; the electrode assembly was placed in a hard-shell outer package, and the electrolyte prepared above was added, and then the electrode assembly was packaged, rested, formed, aged, and subjected to other processes to obtain a secondary battery cell.

[0297] Performance test

[0298] (1) Test of the heat shrinkage rate of the separator film

[0299] The test of the heat shrinkage rate of the separator film can refer to GB / T 36363-2018.

[0300] The release film is punched into a sample with a width of 50 mm and a length of 100 mm by a punch machine, 5 parallel samples are placed on an A4 paper, and then the A4 paper with the samples is placed on the corrugated paper with a thickness of 1 mm to 5 mm.

[0301] The temperature of the air-blast oven is set to 130℃, and after the temperature reaches the set temperature and stabilizes for 60 min, the A4 paper placed on the corrugated paper is placed in the air-blast oven, timing starts, and after reaching the set time (1 h in the present disclosure), the length and width of the release film are measured, and the values are marked as a and b, respectively.

[0302] The heat shrinkage rate is calculated: the longitudinal (MD) heat shrinkage rate = [(100-a) / 100]x100%, and the transverse (TD) heat shrinkage rate = [(50-b) / 50]x100%, and the average value of 3 parallel samples is taken as the test result.

[0303] (2) High-temperature storage performance test of secondary battery cell

[0304] At 25℃, the secondary battery cell is charged at 1 / 3C constant current to 4.25V, then charged at 4.25V constant voltage to a current of 0.05C, and rested for 5 min, then discharged at 1 / 3C constant current to 2.8V, and the obtained discharge capacity is recorded as the pre-storage capacity C0; then the secondary battery cell is charged at 1 / 3C constant current to 4.25V, and then charged at 4.25V constant voltage to a current of 0.05C, at which time the secondary battery cell is in a full charge state; the full charge state of the secondary battery cell is placed in a 60℃ constant temperature oven for 30 days, and after the end, the secondary battery cell is taken out, and when the temperature of the secondary battery cell decreases to 25℃, it is discharged at 1 / 3C constant current to 2.8V, and the obtained discharge capacity is recorded as the post-storage capacity C1. The capacity retention rate of the secondary battery cell stored at 60℃ for 30 days = post-storage capacity C1 / pre-storage capacity C0x100%.

[0305] Table 1

[0306] From the above test results, it can be seen that the phenolic resin-based organic particles prepared in the embodiments of the present disclosure can effectively improve the heat resistance of the release film and the high-temperature storage performance of the secondary battery cell.

[0307] Next, the phenolic resin-based organic particles are replaced with polymer particles containing triazine ring structure units.

[0308] Melamine, benzoguanamine, formaldehyde were reacted in an alkaline environment with a pH of 9±0.1 to obtain a melem resin containing a triazine ring structure. The mass ratio of melamine to benzoguanamine was 97:3, and the ratio of the total number of moles of melamine and benzoguanamine to the number of moles of formaldehyde was 1:2.2. The melem resin containing a triazine ring structure was cured at 200°C for 4h in an air atmosphere, and then was subjected to crushing, sanding, sieving, and magnetic removal to obtain polymer particles 2-1# containing a triazine ring structure unit.

[0309] Melamine, benzoguanamine, formaldehyde were reacted in an alkaline environment with a pH of 9±0.1 to obtain a melem resin containing a triazine ring structure. The mass ratio of melamine to benzoguanamine was 97:3, and the ratio of the total number of moles of melamine and benzoguanamine to the number of moles of formaldehyde was 1:2.2. The melem resin containing a triazine ring structure was cured at 220°C for 4h in an air atmosphere, and then was subjected to crushing, sanding, sieving, and magnetic removal to obtain polymer particles 2-2# containing a triazine ring structure unit.

[0310] Melamine, benzoguanamine, formaldehyde were reacted in an alkaline environment with a pH of 9±0.1 to obtain a melem resin containing a triazine ring structure. The mass ratio of melamine to benzoguanamine was 97:3, and the ratio of the total number of moles of melamine and benzoguanamine to the number of moles of formaldehyde was 1:2.2. The melem resin containing a triazine ring structure was cured at 245°C for 4h in an air atmosphere, and then was subjected to crushing, sanding, sieving, and magnetic removal to obtain polymer particles 2-3# containing a triazine ring structure unit.

[0311] Melamine, benzoguanamine, formaldehyde were reacted in an alkaline environment with a pH of 9±0.1 to obtain a melem resin containing a triazine ring structure. The mass ratio of melamine to benzoguanamine was 97:3, and the ratio of the total number of moles of melamine and benzoguanamine to the number of moles of formaldehyde was 1:2.2. The melem resin containing a triazine ring structure was cured at 150°C for 4h in an air atmosphere, and then was subjected to crushing, sanding, sieving, and magnetic removal to obtain polymer particles D2-1# containing a triazine ring structure unit.

[0312] The above prepared organic particles 2-1# to 2-3# satisfy the following characteristics: they have no glass transition temperature T g .

[0313] The organic particles D2-1# have a glass transition temperature T g .

[0314] Table 2

[0315] From the above test results, it can be seen that the polymer particles containing triazine ring structure units prepared in the embodiments of the present disclosure can effectively improve the heat resistance of the isolation film and the high-temperature storage performance of the secondary battery cell.

[0316] Next, the phenolic resin organic particles are replaced with silicon-containing organic resin particles.

[0317] A pre-emulsion is prepared by emulsifying 0.3 g of sodium persulfate, 0.3 g of sodium bicarbonate, 1.5 g of sodium dodecyl sulfate, 30 g of deionized water, 55.2 g of vinyl trimethoxysilane, 3 g of vinyl triethoxysilane, and 1.8 g of divinylbenzene. A reactor is taken, 210 g of deionized water is added, and the temperature is raised to 65°C. Under the conditions of nitrogen protection and stirring, the above pre-emulsion is added dropwise, and after reaction for 4 h, the temperature is raised to 75°C for curing reaction for 1.6 h, to obtain the silicon-containing organic resin particle emulsion 3-1#.

[0318] A pre-emulsion is prepared by emulsifying 0.3 g of sodium persulfate, 0.3 g of sodium bicarbonate, 1.5 g of sodium dodecyl sulfate, 30 g of deionized water, 53.4 g of vinyl trimethoxysilane, 3 g of vinyl triethoxysilane, and 3.6 g of divinylbenzene. A reactor is taken, 210 g of deionized water is added, and the temperature is raised to 65°C. Under the conditions of nitrogen protection and stirring, the above pre-emulsion is added dropwise, and after reaction for 4 h, the temperature is raised to 75°C for curing reaction for 1.6 h, to obtain the silicon-containing organic resin particle emulsion 3-2#.

[0319] A pre-emulsion is prepared by emulsifying 0.3 g of sodium persulfate, 0.3 g of sodium bicarbonate, 1.5 g of sodium dodecyl sulfate, 30 g of deionized water, 60 g of vinyl trimethoxysilane. A reactor is taken, 210 g of deionized water is added, and the temperature is raised to 65°C. Under the conditions of nitrogen protection and stirring, the above pre-emulsion is added dropwise, and after reaction for 4 h, the temperature is raised to 75°C for curing reaction for 1.6 h, to obtain the silicon-containing organic resin particle emulsion D3-1#.

[0320] The above-prepared organic particles 3-1# to 3-2# satisfy the following characteristics: the silicon-containing organic resin particles are network structures formed with carbon-carbon bonds as the main chain, and the side chains contain siloxane structures, which have no glass transition temperature T g .

[0321] The organic particles D3-1# have a glass transition temperature T g .

[0322] Table 3

[0323] From the above test results, it can be seen that the silicon-containing organic resin particles prepared in the embodiments of the present disclosure can effectively improve the heat resistance of the isolation film and the high-temperature storage performance of the secondary battery cell.

[0324] Note that the present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and embodiments having substantially the same configuration, function, and effect as the technical idea of the present disclosure are included in the technical scope of the present disclosure. Furthermore, various modifications that can be thought of by those skilled in the art, and other modes of embodiment constructed by combining part of the configurations of the embodiments, are also included in the scope of the present disclosure without departing from the spirit of the present disclosure.

Claims

1. A secondary battery cell comprising a positive electrode sheet, a negative electrode sheet, and a separator film, the separator film being provided between the positive electrode sheet and the negative electrode sheet, the separator film comprising a porous base film and a coating layer on at least one side of the porous base film, wherein, The coating layer includes organic particles, and the organic particles have no glass transition temperature below 300°C.

2. The secondary battery cell according to claim 1, wherein, the organic particles are at least one of thermosetting resin polymers or crosslinked polymers; and / or, the organic particles are amorphous polymers.

3. The secondary battery cell according to any one of claims 1-2, wherein, The true density of the organic particles is 1.0 g / cm 3 -2.0 g / cm 3 , optionally 1.0 g / cm 3 -1.8 g / cm 3 ; and / or, the organic particles have a volume distribution particle size Dv50 of less than 1 μm, optionally 50 nm-800 nm.

4. The secondary battery cell according to any one of claims 1 to 3, wherein The organic particles include one or more of phenol resin-based organic particles, polymer particles containing triazine ring structure units, and silicon-containing organic resin particles.

5. The secondary battery cell according to claim 4, wherein, the phenol resin-based organic particles are thermosetting resol polymers; and / or, the phenol resin-based organic particles have a volume distribution particle size Dv50 of 160 nm-800 nm.

6. The secondary battery cell according to any one of claims 4-5, wherein, the polymer particles containing triazine ring structure units include bridging structures connecting the triazine ring structure units; and / or, the polymer particles containing triazine ring structure units have a volume distribution particle size Dv50 of 160 nm-800 nm.

7. The secondary battery cell according to claim 6, wherein The bridging structures include one or a combination of two or more of alkylene, alkylene ether, alkylene amine, ester group, and amide group.

8. The secondary battery cell according to any one of claims 4 to 7, wherein The polymer particles containing triazine ring structure units further have substituents on the triazine ring structure units, the substituents including one or a combination of two or more of alkyl, alkenyl, phenyl, cycloalkyl, amine group, hydroxyl, and halogen.

9. The secondary battery cell according to any one of claims 4 to 8, wherein The polymer particles containing triazine ring structure units include at least one of melamine formaldehyde polymers and derivatives thereof, etherified melamine formaldehyde polymers and derivatives thereof, etherified melamine formaldehyde-polyol polymers and derivatives thereof, etherified melamine formaldehyde-polybasic acid polymers and derivatives thereof, and etherified melamine formaldehyde-polyamine amide polymers and derivatives thereof.

10. The secondary battery cell according to claim 9, wherein, the melamine formaldehyde polymers and derivatives thereof include one or more of melamine formaldehyde, benzoguanamine formaldehyde, melamine-benzoguanamine formaldehyde, melamine-(2,4-diamino-1,3,5-triazine) formaldehyde, melamine-(6-methyl-1,3,5-triazine-2,4-diamine) formaldehyde, melamine-(2,4,6-triethylamino-1,3,5-triazine) formaldehyde, trihydrazino-s-triazine formaldehyde, melamine-(2-amino-4-methylamino-1,3,5-triazine) formaldehyde, and melamine-(2,4-diamino-6-dimethylamino-1,3,5-triazine) formaldehyde; and / or, the etherified melamine formaldehyde polymers and derivatives thereof include one or more of methyl etherified melamine formaldehyde, butyl etherified melamine formaldehyde, methyl etherified benzoguanamine formaldehyde, and butyl etherified benzoguanamine formaldehyde; and / or, the etherified melamine formaldehyde polymers and derivatives thereof include one or more of methyl etherified melamine formaldehyde, butyl etherified melamine formaldehyde, methyl etherified benzoguanamine formaldehyde, and butyl etherified benzoguanamine formaldehyde. the etherified melamine-aldehyde-polyamine amide polymers and derivatives thereof include one or more of a methyl etherified melamine formaldehyde-ethylenediamine polymer, a methyl etherified melamine formaldehyde-1,2 propanediamine polymer, a methyl etherified melamine formaldehyde-1,4 butanediol polymer, a methyl etherified melamine formaldehyde-polyester polyol polymer, a methyl etherified melamine formaldehyde-polyvinyl alcohol polymer, a butyl etherified melamine formaldehyde-ethylenediamine polymer, a butyl etherified melamine formaldehyde-1,2 propanediamine polymer, a butyl etherified melamine formaldehyde-1,4 butanediol polymer, a butyl etherified melamine formaldehyde-polyester polyol polymer; and / or, the etherified melamine-aldehyde-polybasic acid polymers and derivatives thereof include one or more of a methyl etherified melamine formaldehyde-oxalic acid polymer, a methyl etherified melamine formaldehyde-malic acid polymer, a methyl etherified melamine formaldehyde-succinic acid polymer, a methyl etherified melamine formaldehyde-citric acid polymer, a methyl etherified melamine formaldehyde-terephthalic acid polymer, a methyl etherified melamine formaldehyde-phthalic acid polymer, a butyl etherified melamine formaldehyde-oxalic acid polymer, a butyl etherified melamine formaldehyde-malic acid polymer, a butyl etherified melamine formaldehyde-citric acid polymer, a butyl etherified melamine formaldehyde-terephthalic acid polymer, a butyl etherified melamine formaldehyde-phthalic acid polymer; and / or, the etherified melamine-aldehyde-polyamine amide polymers and derivatives thereof include one or more of a methyl etherified melamine formaldehyde-ethylenediamine polymer, a methyl etherified melamine formaldehyde-1,2 propanediamine polymer, a methyl etherified melamine formaldehyde-1,4 butanediol polymer, a methyl etherified melamine formaldehyde-polyester polyol polymer, a methyl etherified melamine formaldehyde-polyvinyl alcohol polymer, a butyl etherified melamine formaldehyde-ethylenediamine polymer, a butyl etherified melamine formaldehyde-1,2 propanediamine polymer, a butyl etherified melamine formaldehyde-1,4 butanediol polymer, a butyl etherified melamine formaldehyde-polyester polyol polymer; and / or, 11. The secondary battery cell according to any one of claims 4 to 10, wherein the silicon-containing organic resin particles are silicon-containing organic crosslinked resin particles, the silicon-containing organic resin particles contain a carbon-carbon bond and a siloxane structure; and / or the volume distribution particle size Dv50 of the silicon-containing organic resin particles is 86 nm to 310 nm.

12. The secondary battery cell according to any one of claims 4-11, wherein, the silicon-containing organic resin particles are silicon-containing organic crosslinked resin particles, the silicon-containing organic resin particles are a network structure formed with a carbon-carbon bond as a main chain, and a side chain containing a siloxane structure.

13. The secondary battery cell of any one of claims 11-12, wherein, the silicon-containing organic crosslinked resin particles include a crosslinked structure unit; Optionally, the crosslinking structural unit comprises one or more of a divinylbenzene structural unit, a diethylene glycol divinyl ether structural unit, a triethylene glycol divinyl ether structural unit, a maleic acid diallyl ester structural unit, a ethylene glycol dimethacrylate structural unit, a 1,4-butanediol diacrylate structural unit, a 1,6-hexanediol diacrylate structural unit, a 1,8-octanediol diacrylate structural unit, a trimethylolpropane triacrylate structural unit, a pentaerythritol trimethacrylate structural unit, a tetraethylene glycol dimethacrylate structural unit, a tripropylene glycol diacrylate structural unit, a 2,2,4-trimethyladipic acid bis[2-ethylaziridine] structural unit, a 1,1-sebacic acid bis[2-methylaziridine] structural unit, a 1,1-(1,3-phenylenedicarbonyl)bis[2-methylaziridine] structural unit, a trimethylolpropane tris(2-methyl-1-aziridinyl propionate) structural unit, a trimethylolpropane-tris[3-(2-methylaziridinyl)propionate] structural unit, a pentaerythritol tris(3-aziridinyl)propionate structural unit.

14. The secondary battery cell according to any one of claims 1 to 13, wherein The ratio of the volume distribution particle size Dv50 of the organic particles to the average pore size of the porous base film is greater than or equal to 1.

1.

15. The secondary battery cell according to any one of claims 1 to 14, wherein, The coating further comprises a binder; and / or, The mass content of the organic particles in the coating is 50% to 99% based on the total mass of the coating; and / or, The thickness of the coating is 0.5 μm to 5 μm; and / or, The areal density of the coating is 0.45 g / m 2 - 5 g / m 2 .

16. A battery device characterized by comprising: A plurality of the secondary battery cell according to any one of claims 1 to 15.

17. An electrical device, comprising: The secondary battery cell according to any one of claims 1 to 15 or the battery device according to claim 16.

18. A separator membrane comprising a porous base membrane and a coating on at least one side of the porous base membrane, wherein, The coating comprises organic particles, and the organic particles have no glass transition temperature below 300°C.

19. The separator film according to claim 18, wherein, The organic particles are at least one of a thermosetting resin polymer or a crosslinked polymer; and / or, The organic particles are an amorphous polymer.

20. The separator film according to claim 18 or 19, wherein, The true density of the organic particles is 1.0 g / cm 3 - 2.0 g / cm 3 , optionally 1.0 g / cm 3 - 1.8 g / cm 3 ; and / or, The volume distribution particle size Dv50 of the organic particles is less than 1 μm, and is optionally 50 nm to 800 nm.

21. The separator membrane according to any one of claims 18-20, wherein, The organic particles comprise one or more of a phenol formaldehyde resin-based organic particle, a polymer particle containing a triazine ring structural unit, a silicon-containing organic resin particle.

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