Preparation method of lithium-ion battery diaphragm and lithium-ion battery diaphragm
A technology of lithium-ion batteries and diaphragms, which is applied to battery components, circuits, electrical components, etc., can solve the problems of not being able to meet high-rate rapid discharge, decrease in porosity and air permeability, and increase in coating and drying costs. Good through hole, high porosity, avoiding the effect of process and equipment
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preparation example Construction
[0021] The preparation method of the new lithium-ion battery diaphragm provided by the application solves this technical problem well. In this method, the inorganic particles are first added to the organic solvent and stirred to make a suspension of the inorganic particles, and then the inorganic particles are added Add extrusion-grade PVDF resin to the suspension, stir and mix to make a mixed slurry, directly extrude the mixed slurry into a base film, and then use conventional heat treatment, stretching and other steps to stretch the base film into a porous film , namely the lithium-ion battery separator of the present application. Wherein the stirring speed is 100-300rpm / min, and the stirring speed is carried out from slow to fast.
[0022] It should be noted that the stirring speed is carried out from slow to fast, which means in this application that the stirring speed when adding inorganic particles is lower than the stirring speed after adding PVDF resin, that is to say,...
Embodiment 1
[0026] Weigh 30 parts of dimethylacetamide organic solvent, 50 parts of extrusion-grade PVDF resin, 19 parts of silica particles, and 1 part of silane-based 550 dispersant; first add the organic solvent and 550 dispersant to the stirring tank and mix for 30 minutes , the stirring speed is 200rpm / min; then add the silica particles into the stirring tank, and stir and mix at 200rpm / min for 30 minutes; then add extrusion-grade PVDF resin, and stir and mix at 300rpm / min for 1 hour to prepare the mixed slurry; The mixed slurry was extruded and casted at 200°C to obtain the base film; then the base film was heat-treated in an oven at 120°C for 1 hour, and finally cold-drawn, hot-drawn and heat-set at high temperature to obtain a microporous film, which is the lithium-ion battery in this example diaphragm. In this example, during the high-temperature heat setting stage, the volatilized organic solvent can also be condensed and recycled.
[0027] The lithium-ion battery separator pre...
Embodiment 2
[0029] Weigh 40 parts of N,N-dimethylformamide organic solvent, 40 parts of extrusion-grade PVDF resin, 19 parts of silica particles, and 1 part of silane-based 550 dispersant; first add the organic solvent and 550 dispersant and stir Kettle, stirring and mixing at 150rpm / min for 30 minutes; then adding silica particles into the stirring tank, stirring and mixing at 150rpm / min for 30 minutes; then adding PVDF resin, stirring and mixing at 250rpm / min for 1 hour to obtain a mixed slurry; The slurry was extruded and casted at 180°C to obtain a base film, and then the base film was heat-treated in an oven at 120°C for 1 hour, and finally cold-drawn, hot-drawn, and heat-set at a high temperature to obtain a microporous film, that is, the lithium ion film of this example. battery separator. In the high-temperature heat setting stage, the volatilized organic solvent can be condensed and recycled.
[0030] The lithium-ion battery separator prepared in this example not only has a high...
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