Polymer film, gel polymer electrolyte and polymer lithium battery, and preparation method of polymer lithium battery
A gel polymer, polymer film technology, applied in the direction of electrolyte immobilization/gelation, secondary batteries, battery pack components, etc., can solve problems such as poor mechanical properties, and achieve improved safety and ionic conductivity. And the effect of improved safety performance and high ionic conductivity
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[0016] The present invention provides a kind of polymer film, and described polymer film is prepared by following steps:
[0017] S1. Two different polymers A and B are prepared into solutions respectively, and then electrospun simultaneously through dual channels to obtain a spinning film F; wherein the polymer A is selected from polyimide, polyacrylonitrile, poly Any one of styrene, epoxy resin, polyvinyl difluoride, and polyvinylpyrrolidone, and the polymer B is selected from any one of polyvinyl alcohol, polyoxyethylene, and polyoxypropylene;
[0018] S2. Soak the spinning film F in a selective solvent, remove the polymer B in the spinning film F, and obtain the polymer film; the selective solvent can dissolve the polymer B, but is slightly soluble or insoluble Solvent for Polymer A.
[0019] In the prior art, the two polymers are first blended, and then electrospun, and each fiber in the resulting spun film contains the aforementioned two polymers. Therefore, after one o...
Embodiment 1
[0035] Dry polyvinyl difluoride and polyoxyethylene at 60°C. Weigh 1g of polyvinyl difluoride, add it to 10mL N,N-dimethylacetamide, heat and stir at 70°C until a uniform, transparent and clear polymer A1 solution is formed with a concentration of 0.1g / mL; Take 2g of polyoxyethylene, add it to 10mL of deionized water, heat and stir at 70°C until a uniform polymer B1 solution is formed, and the solution concentration is 0.2g / mL;
[0036] At a room temperature of 25°C and a relative humidity of 52%, the polymer A1 solution and the polymer B1 solution were transported to two nozzles with an inner diameter of 0.8mm on the electrospinning equipment at a flow rate of 0.8mL / h, respectively, and heated at 10KV Electrospinning is carried out in a high-voltage electric field, and the spinning conditions include: the receiving distance is 13 cm, the moving speed of the nozzle is 5.5 mm / s, and the rotating speed of the receiver is 500 rpm. After the solvent on the surface of the receiver...
Embodiment 2
[0038] The polyimide and polyvinyl alcohol were dried at 60°C. Weigh 1.2g polyimide, add it to 10mL N,N-dimethylacetamide, heat and stir at 70°C until a uniform, transparent and clear polymer solution A2 is formed, with a concentration of 0.12g / mL; Take 1.8g of polyvinyl alcohol, add it to 10mL of deionized water, heat and stir at 70°C until a uniform polymer solution B2 is formed, and the solution concentration is 0.18g / mL;
[0039] At a room temperature of 25°C and a relative humidity of 52%, the polymer solutions A2 and B2 were transported to two nozzles with an inner diameter of 0.8mm on the electrospinning equipment at a flow rate of 0.8mL / h, and were heated at a high pressure of 10KV. Electrospinning was carried out in an electric field, and the spinning conditions included: the receiving distance was 13 cm, the moving speed of the nozzle was 5.5 mm / s, and the rotating speed of the receiver was 500 rpm. After the solvent on the surface of the receiver evaporates, the sp...
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