Gel electrolyte and preparation method thereof and corresponding anode and lithium sulfur battery
A gel electrolyte, lithium-sulfur battery technology, applied in non-aqueous electrolyte batteries, lithium batteries, battery electrodes, etc., can solve problems such as poor battery cycle performance, achieve high conductivity, be conducive to large-scale industrial production, and simple process Effect
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Embodiment 1
[0028] Gel electrolyte solution: In a flowing nitrogen atmosphere, the number average molecular weight is 6.0×10 5 Polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP, of which HFP content is 10%), silicon dioxide with a particle size of 50 nm and a solvent containing 1.0 mol / L lithium hexafluorophosphate (propylene carbonate and diethyl carbonate ) at a mass ratio of 1:0.5:(3+7), and stirred at 75°C until dissolved.
[0029] Positive electrode: In a nitrogen atmosphere, the above-mentioned gel electrolyte solution was evenly coated on the surface of the positive electrode with a coating thickness of 80 microns.
[0030] Lithium-sulfur battery: use the above-mentioned positive electrode coated with gel electrolyte, use 130 micron lithium foil as the negative electrode, and 20 micron PE porous film as the separator, and prepare button cells in a humidity-controlled glove box. The preparation method of the lithium-sulfur battery can be known to those skilled in the art.
[0...
Embodiment 2
[0035] Gel electrolyte solution: In a flowing nitrogen atmosphere, the number average molecular weight is 6.0×10 5 Polyethylene oxide (PEO), silicon dioxide with a particle size of 50 nm and a solvent containing 1.0 mol / L lithium hexafluorophosphate (propylene carbonate and diethyl carbonate) are mixed at a mass ratio of 1:0.5:(3+7) , stirred at 75 °C until dissolved.
[0036] Positive electrode: In a nitrogen atmosphere, the above-mentioned gel electrolyte solution was uniformly coated on the surface of the positive electrode with a coating thickness of 10 microns.
[0037] Lithium-sulfur battery: use the above-mentioned positive electrode coated with gel electrolyte, use 130 micron lithium foil as the negative electrode, and 20 micron PE porous film as the separator, and prepare button cells in a humidity-controlled glove box.
[0038] High-temperature storage: store the above-mentioned lithium-sulfur battery at 75°C for 12 hours.
[0039] Comparative preparation:
[0040...
Embodiment 3
[0042] Gel electrolyte solution: In a flowing nitrogen atmosphere, the number average molecular weight is 6.0×10 5 Polymethyl methacrylate (PMMA), silicon dioxide with a particle size of 50 nm, and a solvent containing 1.0 mol / L lithium hexafluorophosphate (propylene carbonate and diethyl carbonate) at a mass ratio of 1:0.5:(3+ 7) Mix and stir at 75°C until dissolved.
[0043] Positive electrode: In a nitrogen atmosphere, the above-mentioned gel electrolyte solution was evenly coated on the surface of the positive electrode with a coating thickness of 150 microns.
[0044] Lithium-sulfur battery: use the above-mentioned positive electrode coated with gel electrolyte, use 130 micron lithium foil as the negative electrode, and 20 micron PE porous film as the separator, and prepare button cells in a humidity-controlled glove box.
[0045] High-temperature storage: store the above-mentioned lithium-sulfur battery at 75°C for 12 hours.
[0046] Comparative preparation:
[0047] ...
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