Polyaryletherketone polymer synthesis method, PAEK film, PAEK-Al2O3 composite film preparation method and application

Abstract

The invention relates to a synthesis method of a polyaryletherketone polymer, which comprises the following steps: 1. installing a three-neck flask with a reflux device and a water diversion device ona magnetic stirrer, and putting the flask into an oil bath pan; 2, successively adding 0.6546 g of 4,4'-difluorobenzophenone, 1.0512 g of bisphenolfluorene, 0.828 g of potassium carbonate, 10 ml of an N,N-dimethylacetamide solution and 10 ml of a toluene solution; 3, slowly heating the reactants to 140 DEG C, carrying out constant temperature reflux for 4 h, heating the reactants to 175 DEG C, and carrying out a reaction for 5 h; 4, cooling a reaction product to room temperature to obtain a viscous solid, soaking the viscous solid with a methanol aqueous solution to clean the residual organicsolvent, dropwise adding the liquid into a hydrochloric acid aqueous solution to obtain a precipitate, and filtering the mixture; and step 5, drying the solid in a vacuum drying oven at 110 DEG C for24 hours to obtain the polyaryletherketone polymer with the yield of 96%. According to the invention, the thermal stability is enhanced, the affinity to an electrolyte is good, and the best performance effect is shown on the safety and electrochemical performance of LIB.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery diaphragms, and in particular relates to a synthesis method of a heat-resistant polyaryletherketone (PAEK) polymer, a preparation method of a PAEK film and a PAEK-Al2O3 composite film and applications thereof. Background technique [0002] Lithium-ion batteries (LIBs), which have the advantages of high energy density, long cycle life, and no memory effect, have been widely used in portable electronic devices and power-type devices, such as mobile phones, digital cameras, and electric vehicles. [0003] The lithium-ion battery separator is sandwiched between the positive and negative plates, allowing lithium ions (Li + ) during the charge and discharge process to quickly transfer and isolate the direct contact of the two electrodes to avoid short circuit or even explosion of the battery. An ideal LIB separator should have high porosity, good electrolyte wettability, enha...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to overcome the defects of thermal stability, low mechanical strength and easy swelling of lithium-ion battery separators in the prior art, to propose a heat-resistant polyaryletherketone polymer and to prepare it by electrospinning PAEK membrane and PAEK-Al2O3 composite membrane, enhanced thermal stability and improved electrochemical performance, have good affinity for electrolyte, and show the best performance effect on the safety and electrochemical performance of LIB

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