High-heat-resistance and high-breakdown lithium battery microporous diaphragm and preparation method thereof
A lithium battery diaphragm, high breakdown technology, applied in the direction of lithium batteries, battery components, non-aqueous electrolyte batteries, etc., can solve the problem of limiting the application of polyimide microporous membranes, low production efficiency of pore-making process, and pore-forming Solve problems such as cumbersome process steps to achieve good chemical stability, excellent mechanical properties, and excellent mechanical properties
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Embodiment 1
[0036] A method for preparing a lithium battery microporous diaphragm with high heat resistance and high breakdown is characterized in that it comprises the following steps:
[0037] S1. In parts by mass, 28 parts of ultra-high molecular weight polyethylene with a molecular weight of 600,000, 2 parts of porous polyimide microspheres with a particle diameter D90 of 7 μm, 70 parts of paraffin oil and 0.003 part of antioxidant are mixed evenly, get the mixture;
[0038] S2. Add the compound into the twin-screw extruder, control the temperature of each section of the extruder barrel to 130°C, 140°C, 150°C, 180°C, 200°C, 210°C, 190°C, and pass through the extruder The screw is mixed and sheared, the die is extruded, and then the cast sheet is obtained after cooling and shaping;
[0039]S3. Stretch the cast sheet longitudinally at 90°C, the longitudinal stretching ratio is 3 times, and then stretch it transversely at 120°C, 125°C, 130°C, 130°C, 125°C, and stretch it transversely on...
Embodiment 2
[0041] A method for preparing a lithium battery microporous diaphragm with high heat resistance and high breakdown is characterized in that it comprises the following steps:
[0042] S1. In parts by mass, 25 parts of ultra-high molecular weight polyethylene with a molecular weight of 900,000, 4 parts of porous polyimide microspheres with a particle diameter D90 of 12 μm, 71 parts of paraffin oil and 0.003 part of antioxidant are mixed evenly, get the mixture;
[0043] S2. Add the compound into the twin-screw extruder, control the temperature of each section of the extruder barrel to 140°C, 150°C, 170°C, 190°C, 210°C, 220°C, 190°C, and pass through the extruder The screw is mixed and sheared, the die is extruded, and then the cast sheet is obtained after cooling and shaping;
[0044] S3. Stretch the cast sheet longitudinally at 95°C, the longitudinal stretching ratio is 3 times, and then stretch it transversely at 122°C, 128°C, 132°C, 135°C, 125°C, and stretch it transversely ...
Embodiment 3
[0046] A method for preparing a lithium battery microporous diaphragm with high heat resistance and high breakdown is characterized in that it comprises the following steps:
[0047] S1, in parts by mass, 20 parts of ultra-high molecular weight polyethylene with a molecular weight of 1.2 million, 8 parts of porous polyimide microspheres with a particle diameter D90 of 15 μm, 72 parts of paraffin oil and 0.003 part of antioxidant are mixed evenly, get the mixture;
[0048] S2. Add the mixture into the twin-screw extruder, control the temperature of each section of the extruder barrel to 135°C, 155°C, 180°C, 200°C, 220°C, 220°C, 190°C, and pass through the extruder The screw is mixed and sheared, the die is extruded, and then the cast sheet is obtained after cooling and shaping;
[0049] S3. Stretch the cast sheet longitudinally at 95°C, the longitudinal stretching ratio is 2.5 times, and then transversely stretch once at 125°C, 130°C, 135°C, 135°C, 125°C, and once transversely...
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