Solvated composite solid electrolyte and preparation method and application thereof
A solid electrolyte and solvation technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as inability to meet performance at the same time, achieve the effect of preventing excessive hardness and improving ionic conductivity
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[0038] The preparation process of the solvated composite solid electrolyte is as follows:
[0039] Step 1, using vinylidene fluoride-co-hexafluoropropylene and polyethylene oxide as the solute and dimethylformamide as the solvent to prepare vinylidene fluoride-co-hexafluoropropylene with a mass fraction of 5%-15% solution, and a polyethylene oxide solution with a mass fraction of 1%-5%; the two solutions are separately placed in an oven, baked at 50-70° C. for 6 hours, and then taken out to form a solution with uniform composition.
[0040] Step 2, the polyoxyethylene solution that step 1 obtains and Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 (abbreviated as LAGP) mixed and stirred at 50-70 ° C, the mixed polyethylene oxide solution Li 1.5 al 0.5 Ge 1.5 (PO 4 ) 3 Among them, the mass ratio of the solid content of the two is 1: (0.6-1.5); the stirring method is preferably magnetic stirring, and the stirring speed is 300r / min, and the mixed solution is obtained by stirring evenly; ...
Embodiment 1
[0052] (1) Using vinylidene fluoride-co-hexafluoropropylene and polyethylene oxide as the solute and dimethylformamide as the solvent, respectively prepare solutions with a mass fraction of 12% and 2.5%, and place them in an oven at 60°C , After baking for 6 hours, take it out to form a uniform solution, which is conducive to dissolution.
[0053] (2) Mix and stir the polyoxyethylene solution and the LAGP solution at 60°C, the mass ratio of the solid content is 1:1.5 to prepare a mixed solution; add vinylidene fluoride-co-hexafluoropropylene solution to the mixed solution , the solid content of the added vinylidene fluoride-co-hexafluoropropylene solution is 9 times the solid content of the polyethylene oxide solution, and after continuing to stir evenly, a uniform white emulsion is obtained, which is a mixture of three substances.
[0054] (3) Pour the white emulsion into a polytetrafluoroethylene mold, dry it at 25°C for 24 hours, and then dry it with air at 60°C for 4 hours...
Embodiment 2
[0064] (1) Prepare a 10% vinylidene fluoride-co-hexafluoropropylene solution and a 3% polyethylene oxide solution respectively, place them in an oven at 50° C., and take them out after baking for 6 hours to form a uniform solution.
[0065] (2) Mix and stir the polyoxyethylene solution and the LAGP solution at 60°C, the mass ratio of the solid content is 1:1.2 to prepare a mixed solution; add vinylidene fluoride-co-hexafluoropropylene solution to the mixed solution , the solid content of the added vinylidene fluoride-co-hexafluoropropylene solution is 9 times the solid content of the polyethylene oxide solution, and after continuing to stir evenly, a uniform white emulsion is obtained, which is a mixture of three substances.
[0066] (3) Pour the white emulsion into a polytetrafluoroethylene mold, dry it at 40°C for 12 hours, and then dry it with air at 60°C for 20 hours to obtain a composite solid electrolyte film;
[0067] (4) Preparation of solvated ionic liquid electrolyte, ...
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