CN114874369B - Carborane modified polyethylene diaphragm material and preparation method thereof - Google Patents
Carborane modified polyethylene diaphragm material and preparation method thereof Download PDFInfo
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Abstract
The application discloses a carborane modified polyethylene diaphragm material and a preparation method thereof; s1: carborane modified polyethylene monomer: uniformly mixing carborane and toluene, adding n-butyllithium under ice bath condition, heating, adding chloroethylene, oil bath reaction, adding deionized water, washing to obtain upper layer, drying, distilling, and separating by chromatography column; s2: carborane modified polyethylene: mixing carborane modified polyethylene monomer with dichloromethane and azodiisobutyronitrile, adding methanol and n-hexane, precipitating, filtering, and drying. The carborane modified polyethylene prepared by the application can be used for preparing a polyethylene diaphragm and is used in a lithium ion battery diaphragm. According to the application, the B element with stronger thermal stability is introduced into the polyethylene, so that the safety, thermal stability and safety of the battery diaphragm are improved; and after carborane is introduced, the energy density of the battery diaphragm can be improved without ceramic coating on the diaphragm, and the production cost is reduced.
Description
Technical Field
The application relates to the technical field of battery diaphragms, in particular to a carborane modified polyethylene diaphragm material and a preparation method thereof.
Background
At present, a commercial wet method diaphragm of a lithium ion battery is mainly a ceramic diaphragm based on a polyethylene-based diaphragm, but with the increasing requirement of the safety performance of the battery, the defect of the ceramic diaphragm based on the polyethylene-based diaphragm is becoming obvious day by day: poor heat shrinkage performance at high temperature, and severe shrinkage of the membrane at 150 ℃; the weight of the battery is large, so that the energy density of the battery is reduced; the air permeability is too high, so that lithium ions slowly shuttle, the internal resistance of the battery is increased, and the cycle performance/multiplying power performance is reduced; there is a need to develop lithium ion battery separators having excellent properties.
In order to solve the problems of the prior commercial diaphragm, the application provides a carborane modified polyethylene diaphragm material and a preparation method thereof, and the diaphragm has the advantages of high thermal stability, small surface density, low air permeability, good wettability and the like.
Disclosure of Invention
The application aims to provide a carborane modified polyethylene diaphragm material and a preparation method thereof, which are used for solving the problems in the background art.
In order to solve the technical problems, the application provides the following technical scheme:
the preparation method of the carborane modified polyethylene diaphragm material comprises the following steps:
s1: adding carborane into toluene, introducing argon, adding n-butyllithium solution under ice bath condition, reacting for a period of time, adding chloroethylene, continuing oil bath condensation reflux reaction, adding deionized water for quenching after the reaction is finished, washing, drying and filtering, removing solvent by reduced pressure distillation, and separating by a chromatographic column to obtain carborane modified polyethylene monomer;
s2: uniformly mixing a carborane modified polyethylene monomer with dichloromethane and azodiisobutyronitrile, vacuumizing, carrying out oil bath reaction for a period of time, adding methanol for dilution, adding n-hexane for precipitation, filtering and drying to obtain the carborane modified polyethylene.
A further optimized solution comprises the following steps:
s1: mixing carborane with toluene solution, vacuumizing, introducing argon, adding n-butyllithium solution under ice bath condition, reacting for 1-3h, continuously adding chloroethylene, heating to 70-90 ℃, oil bath condition, condensing and refluxing for 6-10h, adding deionized water for quenching reaction, washing, drying and filtering, removing solvent by reduced pressure distillation, and separating by chromatography column to obtain carborane modified polyethylene monomer;
s2: and uniformly mixing dichloromethane, azodiisobutyronitrile and carborane modified polyethylene monomers, vacuumizing, heating to 80-100 ℃, carrying out oil bath reaction for 5-7 days, adding methanol for dilution, slowly dropwise adding the mixture into n-hexane solution for precipitation under stirring, filtering, and drying to obtain the carborane modified polyethylene.
In a further optimized scheme, the structural formula of the carborane is as follows:
in a further optimized scheme, the chemical equation of the carborane modified polyethylene monomer is as follows:
in a further optimized scheme, the chemical equation of the carborane modified polyethylene is as follows:
in a further preferred embodiment, the molecular weight of the carborane modified polyethylene monomer is 800000-1000000.
In a further optimized scheme, in the step S1, the chromatographic column separation eluent is petroleum ether.
According to a further optimized scheme, the carborane modified polyethylene can be used for preparing a carborane modified polyethylene diaphragm and applied to a lithium ion battery diaphragm.
According to a further optimized scheme, the preparation method of the carborane modified polyethylene diaphragm comprises the following steps: uniformly mixing carborane modified polyethylene, an antioxidant and nano particles, adding a pore-forming agent, extruding by a double screw extruder, casting, rapidly cooling, longitudinally stretching and transversely stretching, extracting by methylene dichloride, continuously carrying out secondary transverse stretching, and carrying out heat setting to obtain the carborane modified polyethylene diaphragm.
Further optimized scheme, the carborane modified polyethylene diaphragm comprises the following materials in parts by weight: 80-100 parts of carborane modified polyethylene, 1-10 parts of antioxidant, 3-8 parts of nano particles and 40-60 parts of pore-forming agent.
In a further optimized scheme, the antioxidant is antioxidant 1010; the nano particles are nano silicon dioxide; the pore-forming agent is paraffin oil.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1: the preparation method of the carborane modified polyethylene diaphragm comprises the following steps:
s1: preparation of carborane modified polyethylene monomer: adding 2g of carborane into a toluene round-bottom flask filled with 10mL of carborane, vacuumizing the round-bottom flask, replacing air in the flask with argon, adding 8mL of n-butyllithium solution into a dry injector in an ice-water bath, reacting for 2h at room temperature, adding 2mL of chloroethylene into the dry injector, transferring to an oil bath at 80 ℃, condensing and refluxing for 8h, adding 15mL of deionized water to quench the reaction after the reaction is finished, sequentially washing the reaction product, adding ethyl acetate, saturated ammonium chloride solution, saturated sodium bicarbonate solution and saturated sodium chloride solution, taking an upper organic solution, drying and filtering the organic solution by using anhydrous sodium sulfate, removing redundant solvent by reduced pressure distillation, separating by a chromatographic column, wherein petroleum ether is used as an eluent, and finally obtaining white solid, namely carborane modified polyethylene monomer;
s2: preparation of carborane modified polyethylene: adding 2g of the prepared carborane modified polyethylene monomer into a 250mL flask, sequentially adding 100mL of dichloromethane and 30g of azodiisobutyronitrile, sealing, vacuumizing, reacting in an oil bath at 90 ℃ for 6 days, adding 10mL of methanol, stirring for dilution, slowly dropwise adding the mixture into a beaker filled with 500mL of n-hexane under stirring, precipitating white solid, filtering, and drying in vacuum to obtain white solid, namely carborane modified polyethylene;
s3: 83 parts of carborane modified polyethylene, 1g of antioxidant 1010 and 3g of nano silicon dioxide are uniformly mixed, 45 parts of paraffin oil is added, the mixture is extruded by a double screw extruder, sheet casting is carried out, then rapid cooling is carried out by a cooling roller, longitudinal stretching is carried out at the temperature of 13 ℃ and the temperature of 90 ℃, paraffin oil is extracted by methylene dichloride after transverse stretching is carried out at the temperature of 115 ℃, secondary transverse stretching is carried out at the temperature of 127 ℃ continuously, and finally heat setting is carried out, so that the carborane modified polyethylene diaphragm is obtained.
In this example, the molecular weight of the carborane modified polyethylene monomer is 800000.
Example 2: the preparation method of the carborane modified polyethylene diaphragm comprises the following steps:
s1: preparation of carborane modified polyethylene monomer: adding 2g of carborane into a toluene round-bottom flask filled with 10mL of carborane, vacuumizing the round-bottom flask, replacing air in the flask with argon, adding 7mL of n-butyllithium solution into a dry injector in an ice-water bath, reacting for 1h at room temperature, adding 1mL of chloroethylene into the dry injector, transferring to an oil bath at 70 ℃, condensing and refluxing for 6h, adding 10mL of deionized water to quench the reaction after the reaction is finished, sequentially washing the reaction product, adding ethyl acetate, saturated ammonium chloride solution, saturated sodium bicarbonate solution and saturated sodium chloride solution, taking an upper organic solution, drying and filtering the organic solution by using anhydrous sodium sulfate, removing redundant solvent by reduced pressure distillation, separating by a chromatographic column, wherein petroleum ether is used as an eluent, and finally obtaining white solid, namely carborane modified polyethylene monomer;
s2: preparation of carborane modified polyethylene: adding 2g of the prepared carborane modified polyethylene monomer into a 250mL flask, sequentially adding 50mL of dichloromethane and 25g of azodiisobutyronitrile, sealing, vacuumizing, reacting for 6 days in an oil bath at 80 ℃, adding 10mL of methanol, stirring for dilution, slowly dripping the mixture into a beaker filled with 500mL of n-hexane under stirring, precipitating white solid, filtering, and drying in vacuum to obtain white solid, namely carborane modified polyethylene;
s3: uniformly mixing 80g of carborane modified polyethylene with 4g of antioxidant 1010 and 4g of nano silicon dioxide, adding 40g of paraffin oil, extruding by a double screw extruder, casting, rapidly cooling by a cooling roller, longitudinally stretching at the temperature of 14 ℃ and 92 ℃, transversely stretching at the temperature of 116 ℃, extracting paraffin oil by methylene dichloride, continuously transversely stretching at the temperature of 127 ℃ for the second time at the temperature of 38 ℃, and finally performing heat setting to obtain the carborane modified polyethylene diaphragm.
In this example, the molecular weight of the carborane modified polyethylene monomer is 820000.
Example 3: the preparation method of the carborane modified polyethylene diaphragm comprises the following steps:
s1: preparation of carborane modified polyethylene monomer: adding 2.1g of carborane into a toluene round-bottom flask filled with 11mL of carborane, vacuumizing the round-bottom flask, replacing air in the flask with argon, adding 7.1mL of n-butyllithium solution into a dry injector in an ice-water bath, reacting for 1.1h at room temperature, adding 1.1mL of chloroethylene into the dry injector, transferring into an oil bath at 71 ℃, condensing and refluxing for 7h, adding 11mL of deionized water after the reaction is finished, quenching the reaction, then adding ethyl acetate, saturated ammonium chloride solution, saturated sodium bicarbonate solution and saturated sodium chloride solution, sequentially washing, taking an upper organic solution, drying and filtering by using anhydrous sodium sulfate, decompressing and distilling to remove redundant solvent, separating by a chromatographic column, wherein petroleum ether is used as an eluent, and finally obtaining white solid, namely carborane modified polyethylene monomer;
s2: preparation of carborane modified polyethylene: adding 2.1g of the prepared carborane modified polyethylene monomer into a 250mL flask, sequentially adding 55mL of dichloromethane and 26g of azodiisobutyronitrile, sealing, vacuumizing, reacting for 6 days in an oil bath kettle at 81 ℃, adding 11mL of methanol, stirring for dilution, slowly dropwise adding the mixture into a beaker filled with 510mL of n-hexane under stirring, precipitating a white solid, filtering, and drying in vacuum to obtain a white solid, namely the carborane modified polyethylene;
s3: mixing 85g of carborane modified polyethylene with 6g of antioxidant 1010 and 5g of nano silicon dioxide uniformly, adding 41g of paraffin oil, extruding by a double screw extruder, casting, then rapidly cooling by a cooling roller, longitudinally stretching at the temperature of 15 ℃ and 94 ℃, transversely stretching at the temperature of 118 ℃, extracting paraffin oil by methylene dichloride, continuously transversely stretching at the temperature of 127 ℃ for the second time at the temperature of 38 ℃, and finally performing heat setting to obtain the carborane modified polyethylene diaphragm.
In this example, the molecular weight of the carborane modified polyethylene monomer is 830000.
Example 4: the preparation method of the carborane modified polyethylene diaphragm comprises the following steps:
s1: preparation of carborane modified polyethylene monomer: adding 2.2g of carborane into a toluene round-bottom flask filled with 12mL of carborane, vacuumizing the round-bottom flask, replacing air in the flask with argon, adding 7.2mL of n-butyllithium solution into a dry injector in an ice-water bath, reacting for 1.2h at room temperature, adding 1.2mL of chloroethylene into the dry injector, transferring into an oil bath at 72 ℃, condensing and refluxing for 8h, adding 12mL of deionized water after the reaction is finished, quenching the reaction, sequentially washing the reaction product, then adding ethyl acetate, saturated ammonium chloride solution, saturated sodium bicarbonate solution and saturated sodium chloride solution, taking an upper organic solution, drying and filtering the organic solution by using anhydrous sodium sulfate, decompressing and distilling to remove redundant solvent, separating by a chromatographic column, wherein petroleum ether is used as an eluent, and finally obtaining white solid, namely carborane modified polyethylene monomer;
s2: preparation of carborane modified polyethylene: adding 2g of the prepared carborane modified polyethylene monomer into a 250mL flask, sequentially adding 60mL of dichloromethane and 27g of azodiisobutyronitrile, sealing, vacuumizing, reacting in an oil bath at 90 ℃ for 6 days, adding 12mL of methanol, stirring for dilution, slowly dropwise adding the mixture into a beaker filled with 520mL of n-hexane under stirring, precipitating white solid, filtering, and drying in vacuum to obtain white solid, namely carborane modified polyethylene;
s3: uniformly mixing 90g of carborane modified polyethylene with 7g of antioxidant 1010 and 6g of nano silicon dioxide, adding 50g of paraffin oil, extruding by a double screw extruder, casting, rapidly cooling by a cooling roller, longitudinally stretching at 96 ℃ and 119 ℃ after transversely stretching, extracting paraffin oil by methylene dichloride, continuously transversely stretching at 127 ℃ for the second time at 38 ℃, and finally performing heat setting to obtain the carborane modified polyethylene diaphragm.
In this example, the molecular weight of the carborane modified polyethylene monomer is 850000.
Example 5: the preparation method of the carborane modified polyethylene diaphragm comprises the following steps:
s1: preparation of carborane modified polyethylene monomer: adding 3.2g of carborane into a toluene round bottom flask filled with 15mL of carborane, vacuumizing the round bottom flask, replacing air in the flask with argon, adding 8.5mL of n-butyllithium solution into a dry injector in an ice-water bath, reacting for 2.2h at room temperature, adding 2.2mL of chloroethylene into the dry injector, transferring into an 80 ℃ oil bath, condensing and refluxing for 8.5h, adding 15mL of deionized water after the reaction is finished, quenching the reaction, sequentially washing the reaction product, adding ethyl acetate, saturated ammonium chloride solution, saturated sodium bicarbonate solution and saturated sodium chloride solution, taking an upper organic solution, drying and filtering the upper organic solution by using anhydrous sodium sulfate, decompressing and distilling to remove redundant solvent, and separating by a chromatographic column, wherein petroleum ether is used as an eluent to finally obtain white solid, namely carborane modified polyethylene monomer;
s2: preparation of carborane modified polyethylene: adding 3.2g of the prepared carborane modified polyethylene monomer into a 250mL flask, sequentially adding 85mL of dichloromethane and 30g of azodiisobutyronitrile, sealing, vacuumizing, reacting for 6 days in an oil bath kettle at 85 ℃, adding 15mL of methanol, stirring for dilution, slowly dropwise adding the mixture into a beaker filled with 550mL of n-hexane under stirring, precipitating a white solid, filtering, and drying in vacuum to obtain a white solid, namely the carborane modified polyethylene;
s3: uniformly mixing 90g of carborane modified polyethylene with 8g of antioxidant 1010 and 7g of nano silicon dioxide, adding 55g of paraffin oil, extruding by a double screw extruder, casting, rapidly cooling by a cooling roller, longitudinally stretching at the temperature of 18 ℃ and 100 ℃, transversely stretching at the temperature of 120 ℃, extracting paraffin oil by methylene dichloride, continuously transversely stretching at the temperature of 127 ℃ for the second time at the temperature of 38 ℃, and finally performing heat setting to obtain the carborane modified polyethylene diaphragm.
In this example, the molecular weight of the carborane modified polyethylene monomer is 900000.
Example 6: the preparation method of the carborane modified polyethylene diaphragm comprises the following steps:
s1: preparation of carborane modified polyethylene monomer: adding 3.8g of carborane into a toluene round-bottom flask filled with 18mL of carborane, vacuumizing the round-bottom flask, replacing air in the flask with argon, adding 9.5mL of n-butyllithium solution into a dry injector in an ice-water bath, reacting for 2.8h at room temperature, adding 2.5mL of chloroethylene into the dry injector, transferring into an oil bath at 88 ℃, condensing and refluxing for 9.5h, adding 18mL of deionized water after the reaction is finished, quenching the reaction, sequentially washing the reaction product, adding ethyl acetate, saturated ammonium chloride solution, saturated sodium bicarbonate solution and saturated sodium chloride solution, taking an upper organic solution, drying and filtering the organic solution by using anhydrous sodium sulfate, decompressing and distilling to remove redundant solvent, separating by a chromatographic column, wherein petroleum ether is used as an eluent, and finally obtaining white solid, namely carborane modified polyethylene monomer;
s2: preparation of carborane modified polyethylene: adding 3.8g of the prepared carborane modified polyethylene monomer into a 250mL flask, sequentially adding 95mL of dichloromethane and 32g of azodiisobutyronitrile, sealing, vacuumizing, reacting for 6 days in an oil bath kettle at 95 ℃, adding 18mL of methanol, stirring for dilution, slowly dropwise adding the mixture into a beaker filled with 580mL of n-hexane under stirring, precipitating a white solid, filtering, and drying in vacuum to obtain a white solid, namely the carborane modified polyethylene;
s3: uniformly mixing 95g of carborane modified polyethylene with 9g of antioxidant 1010 and 7.5g of nano silicon dioxide, adding 58g of paraffin oil, extruding by a double screw extruder, casting, rapidly cooling by a cooling roller, longitudinally stretching at the temperature of 19 ℃ and 103 ℃, transversely stretching at the temperature of 120 ℃, extracting paraffin oil by methylene dichloride, continuously transversely stretching at the temperature of 127 ℃ for the second time at the temperature of 38 ℃, and finally performing heat setting to obtain the carborane modified polyethylene diaphragm.
In this example, the molecular weight of the carborane modified polyethylene monomer is 950000.
Example 7: the preparation method of the carborane modified polyethylene diaphragm comprises the following steps:
s1: preparation of carborane modified polyethylene monomer: adding 4g of carborane into a toluene round-bottom flask filled with 30mL of carborane, vacuumizing the round-bottom flask, replacing air in the flask with argon, adding 10mL of n-butyllithium solution into a dry injector in an ice-water bath, reacting for 3h at room temperature, adding 3mL of chloroethylene into the dry injector, transferring to an oil bath at 70-90 ℃, condensing and refluxing for 10h, adding 20mL of deionized water to quench the reaction after the reaction is finished, adding ethyl acetate, saturated ammonium chloride solution, saturated sodium bicarbonate solution and saturated sodium chloride solution, sequentially washing, taking an upper organic solution, drying and filtering with anhydrous sodium sulfate, removing redundant solvent by reduced pressure distillation, separating by a chromatographic column, wherein the petroleum ether is used as an eluent, and finally obtaining white solid, namely carborane modified polyethylene monomer;
s2: preparation of carborane modified polyethylene: adding 4g of the prepared carborane modified polyethylene monomer into a 250mL flask, sequentially adding 100mL of dichloromethane and 35g of azodiisobutyronitrile, sealing, vacuumizing, reacting in an oil bath at 100 ℃ for 6 days, adding 20mL of methanol, stirring for dilution, slowly dropwise adding the mixture into a beaker filled with 600mL of n-hexane under stirring, precipitating white solid, filtering, and drying in vacuum to obtain white solid, namely carborane modified polyethylene;
s3: 100g of carborane modified polyethylene, 10g of antioxidant 1010 and 8g of nano silicon dioxide are uniformly mixed, 60g of paraffin oil is added, the mixture is extruded by a double screw extruder, sheet casting is carried out, then rapid cooling is carried out by a cooling roller, the temperature of the cooling roller is 20 ℃, longitudinal stretching is carried out at 105 ℃, after transverse stretching is carried out at 122 ℃, paraffin oil is extracted by methylene dichloride, the temperature of an extraction tank is 38 ℃, secondary transverse stretching is carried out continuously at 127 ℃, and finally heat setting is carried out, thus obtaining the carborane modified polyethylene diaphragm.
In this example, the molecular weight of the carborane modified polyethylene monomer is 1000000.
Comparative example
Comparative example 1: and (3) melting and extruding the conventional polyethylene raw material, and performing ceramic coating on the prepared conventional polyethylene wet-process diaphragm to obtain the commercial ceramic coated diaphragm.
Experimental data
TABLE 1 results of the various tests of examples 1-7, comparative example 1
Conclusion:
table 1 data shows: in the case of the same thickness and the same porosity, the air permeability of example 1 is favorable for reducing the internal resistance of the battery due to the commercial ceramic coating membrane; at 180 ℃/1 hour in the oven, the separator of example 1 had a heat shrinkage MD of only 0.34 and a td of only 0.16, whereas the currently commercialized ceramic coated separator had already shrunk and melted, and could not be tested. In addition, by introducing carborane, the melting peak of the material is significantly improved.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present application, and the present application is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present application has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. A preparation method of a carborane modified polyethylene diaphragm material is characterized by comprising the following steps: the method comprises the following steps:
s1: adding carborane into toluene, introducing argon, adding n-butyllithium solution under ice bath condition, reacting for a period of time, adding chloroethylene, continuing oil bath condensation reflux reaction, adding deionized water for quenching after the reaction is finished, washing, drying and filtering, removing solvent by reduced pressure distillation, and separating by a chromatographic column to obtain carborane modified polyethylene monomer;
s2: uniformly mixing a carborane modified polyethylene monomer with dichloromethane and azodiisobutyronitrile, vacuumizing, carrying out oil bath reaction for a period of time, adding methanol for dilution, adding n-hexane for precipitation, filtering and drying to obtain the carborane modified polyethylene.
2. The method for preparing the carborane modified polyethylene diaphragm material according to claim 1, which is characterized in that: the method comprises the following steps:
s1: mixing carborane with toluene solution, vacuumizing, introducing argon, adding n-butyllithium solution under ice bath condition, reacting for 1-3h, continuously adding chloroethylene, heating to 70-90 ℃, oil bath condition, condensing and refluxing for 6-10h, adding deionized water for quenching reaction, washing, drying and filtering, removing solvent by reduced pressure distillation, and separating by chromatography column to obtain carborane modified polyethylene monomer;
s2: and uniformly mixing dichloromethane, azodiisobutyronitrile and carborane modified polyethylene monomers, vacuumizing, heating to 80-100 ℃, carrying out oil bath reaction for 5-7 days, adding methanol for dilution, slowly dropwise adding the mixture into n-hexane solution for precipitation under stirring, filtering, and drying to obtain the carborane modified polyethylene.
3. The method for preparing the carborane modified polyethylene diaphragm material according to claim 1, which is characterized in that: the molecular weight of the carborane modified polyethylene monomer is 800000-1000000.
4. The method for preparing the carborane modified polyethylene diaphragm material according to claim 1, which is characterized in that: in the step S1, the chromatographic column separation eluent is petroleum ether.
5. Use of a carborane modified polyethylene separator material prepared according to any of claims 1-4, characterized in that: the carborane modified polyethylene can be used for preparing carborane modified polyethylene diaphragms and is applied to lithium ion battery diaphragms.
6. The use of a carborane modified polyethylene separator material according to claim 5, wherein: the preparation method of the carborane modified polyethylene diaphragm comprises the following steps:
uniformly mixing carborane modified polyethylene, an antioxidant and nano particles, adding a pore-forming agent, extruding by a double screw extruder, casting, cooling, longitudinally stretching and transversely stretching, extracting by methylene dichloride, continuously carrying out secondary transverse stretching, and carrying out heat setting to obtain the carborane modified polyethylene diaphragm.
7. The use of a carborane modified polyethylene separator material according to claim 6, wherein: the carborane modified polyethylene diaphragm comprises the following materials in parts by weight: 80-100 parts of carborane modified polyethylene, 1-10 parts of antioxidant, 3-8 parts of nano particles and 40-60 parts of pore-forming agent.
8. The use of a carborane modified polyethylene separator material according to claim 6, wherein: the antioxidant is antioxidant 1010; the nano particles are nano silicon dioxide; the pore-forming agent is paraffin oil.
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