Production technology for novel high-porosity lithium ion battery membrane
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A technology for lithium-ion batteries and production processes, which is applied in the field of battery diaphragms, and can solve the problems of reduced porosity of diaphragms and reduced performance of lithium batteries
Inactive Publication Date: 2014-06-18
QINGDAO ZHONGKEHUALIAN ADVANCED MATERIAL CO LTD
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[0003] In order to improve the high temperature resistance of lithium battery separators, nano-ceramic coated separators have gradually become the focus of development, but the increase of ceramic coatings will reduce the porosi
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[0029] A kind of preparation method of high-porosity polyethylene lithium battery diaphragm, its operation process flow chart is as follows figure 1 As shown, it mainly includes ingredients—extrusion—filter metering—die extrusion—extraction—drying—biaxial synchronous stretching—heat setting—on-line winding. UHMWPE is used as raw material resin, white oil is used as solvent, and dichloromethane is used as extraction agent.
[0030] The present invention, a kind of preparation method of high-porosity polyethylene lithium battery diaphragm, comprises the following steps:
[0031] Step 1. Ingredients mixing: Weigh polyethylene powder and white oil and mix them uniformly to obtain mixture A, the weight ratio of polyethylene powder and white oil is 1:2-5.5;
[0032] Step 2, extruding, filtering and metering: pass the mixture A in step 1 through a twin-screw extruder with a diameter of 96mm, an aspect ratio of 52, and a temperature of 200°C to obtain a high-temperature melt;
[003...
Embodiment 1
[0041] Step a: To prepare mixture A, first weigh 50Kg of UHMWPE powder (polyvinyl chloride), according to the weight of UHMWPE powder accounting for 16% of the total weight of the final white oil and UHMWPE powder mixture A, and white oil accounting for 85% of the total weight of mixture A. Take 262.5Kg of white oil, pour the white oil and UHMWPE powder into the stirring tank together, preferably the stirrer is in the form of double ribbons for full stirring, and obtain the mixture A for later use;
[0042] Step b: Mixture A is passed through a twin-screw extruder with a diameter of 96mm, an aspect ratio of 52, and a temperature of 200°C to obtain a uniform high-temperature melt of mixture A; the high-temperature melt is filtered through a 500-mesh filter respectively, and the melt pump is metered Enter the extrusion die and extrude;
[0043] Step c: the high-temperature melt flowing out from the slit of the die head passes through four chilling rollers with temperatures of 50...
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Abstract
The invention provides a production technology for a novel high-porosity lithium ion battery membrane, which belongs to the field of battery membranes, and solves the problem that the porosity of the conventional membrane in the market is low. Due to the adoption of the high-porosity membrane obtained by the production technology disclosed by the invention, the performance of a lithium ion battery can be obviously improved. The production technology comprises the steps of feeding polyethylene and white oil mixture into a double-screw extruder to obtain an oil-containing cast sheet through a metering, filtering and extruding die head and a cooling device; then putting the oil-containing cast sheet into an extraction tank, and extracting white oil in the cast sheet; volatilizing to remove a dichloromethane extracting agent on the surface and in the extracted cast sheet to obtain a dry cast sheet; performing bidirectional stretching on the dry cast sheet to obtain the membrane; finally coiling the membrane subjected to the bidirectional stretching after the membrane is subjected to thermal sizing treatment to obtain a finished membrane product. According to the membrane preparation technology, the cast sheet is extracted, then is subjected bidirectional stretching and is subjected to thermal sizing to obtain the lithium battery membrane with the porosity being over 60 percent.
Description
technical field [0001] The invention belongs to the field of battery diaphragms, and in particular relates to a production process of a novel high-porosity lithium-ion battery diaphragm. Background technique [0002] As a high-energy power source, lithium-ion batteries have been widely used in fields such as portable electronic devices, electric tools, electric vehicles, and energy storage power stations. The separator is one of the important raw materials for batteries. Therefore, the safety of lithium-ion batteries Sexuality has always been a concern. As an important part of the lithium-ion battery, the diaphragm is used to separate the positive electrode from the negative electrode material, allowing ions to pass through and preventing electrons from passing through. The performance of the lithium battery diaphragm determines the interface structure and internal resistance of the battery, which directly affects the capacity of the battery. , cycle and safety performance,...
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