A high-performance lithium-sulfur battery separator and its preparation method and application
A lithium-sulfur battery, high-performance technology, applied in the direction of lithium batteries, battery components, non-aqueous electrolyte batteries, etc., can solve the problems of limited inhibition effect, achieve the effects of inhibiting shuttle, solving the problem of poor conductivity of sulfur, and ensuring insulation performance
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[0033] The preparation method of the high-performance lithium-sulfur battery separator of the present invention comprises the following steps:
[0034] Step 1. Extrude ultra-high molecular weight polyethylene (molecular weight 30-2 million), pore-forming agent (paraffin oil, adding ratio of 50%-70%), carbon nanotubes, conductive carbon black and / or graphene through twin-screw extrusion. The sheet is melted, plasticized, mixed and extruded out of the machine, and then cooled by a casting roll to form a film with a thickness of 500-1500 μm, the temperature of the casting roll is 10-60 ° C, and the obtained sheet is biaxially stretched ( Longitudinal and transverse) system to expand the holes and improve the mechanical strength to obtain a film with uniform thickness, the film is extracted by solvent, the paraffin oil is washed out, and then it is shaped by a setting equipment, that is, a honeycomb porous membrane matrix is prepared. The longitudinal stretching ratio is 5-8 tim...
Embodiment 1
[0040] The preparation method of the high-performance lithium-sulfur battery separator of the present embodiment includes the following steps:
[0041] Step 1: Melting, plasticizing, mixing and extruding through a twin-screw extruder to obtain a sheet by melting, plasticizing, mixing and extruding 20% of ultra-high molecular weight polyethylene, 70% of pore former paraffin oil, 3% of carbon nanotubes and 7% of conductive carbon black. After cooling by the casting roll, a film with a thickness of 500 μm was formed, and the temperature of the casting roll was 10 ° C; the obtained sheet was expanded by a biaxial stretching system and the mechanical strength was improved to obtain a film with uniform thickness, and the film was extracted by solvent. The oil is washed out, and then shaped by the shaping equipment to prepare the honeycomb-shaped porous membrane matrix. The longitudinal stretching ratio is 5 times, and the stretching temperature is 90 °C; the transverse stretching ...
Embodiment 2
[0045] The preparation method of the high-performance lithium-sulfur battery separator of the present embodiment includes the following steps:
[0046] Step 1: Melt, plasticize, mix and extrude 40% of ultra-high molecular weight polyethylene, 50% of pore former paraffin oil, 5% of carbon nanotubes and 5% of graphene through a twin-screw extruder to obtain a sheet, and then pass The casting roll was cooled to form a film with a thickness of 1000 μm, and the temperature of the casting roll was 25 ° C; the obtained sheet was expanded by a biaxial stretching system and the mechanical strength was improved to obtain a film with uniform thickness, and the film was extracted by solvent. After washing out, and then shaping by shaping equipment, a honeycomb-shaped porous membrane matrix is prepared. The longitudinal stretching ratio is 7 times, and the stretching temperature is 95 °C; the transverse stretching ratio is 8 times, the stretching temperature is 114 °C, and the setting te...
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