Lithium-sulfur battery electrolyte additive, electrolyte and lithium-sulfur battery
An electrolyte additive and lithium-sulfur battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems affecting battery cycle performance, cycle stability decline, active material extraction, etc. Discharge phenomenon, polysulfide ion elution reduction, effect of promoting conversion
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Embodiment 1
[0022] (1) Preparation of lithium-sulfur battery:
[0023] Use elemental sulfur as the positive electrode active material, add conductive agent, binder and solvent, stir and mix evenly, coat on aluminum foil, dry, roll, and cut to make the positive electrode sheet respectively; use metal lithium as the negative electrode active material The materials are cut by lithium strips and copper foils and then rolled to obtain negative electrode sheets. The positive and negative pole pieces and the polypropylene separator are assembled into a square lithium-sulfur battery by lamination. The battery is injected with liquid, and after being sealed, the lithium-sulfur battery is obtained by chemical formation, air extraction and sealing.
[0024] (2) Preparation of electrolyte
[0025] In a glove box filled with argon (moisture content <0.1ppm, oxygen content <0.1ppm), mix ethylene glycol dimethyl ether and 1,3-dioxolane at a volume ratio of 1:1 and keep Stir, slowly add 1.0mol / L lithi...
Embodiment 2
[0027] (1) Preparation of lithium-sulfur battery according to the method described in Example 1
[0028] (2) Preparation of electrolyte
[0029] In a glove box filled with argon (moisture content <0.1ppm, oxygen content <0.1ppm), mix ethylene glycol dimethyl ether and 1,3-dioxolane at a volume ratio of 1:1 and keep Stir, slowly add 1.0mol / L lithium bistrifluoromethanesulfonimide to the mixed solvent, then add lithium nitrate and 0.5% lithium difluorophosphate with a mass fraction of 2.0%, stir until completely dissolved, and obtain the present Example electrolyte.
Embodiment 3
[0031] (1) Preparation of lithium-sulfur battery according to the method described in Example 1
[0032] (2) Preparation of electrolyte
[0033] In a glove box filled with argon (moisture content <0.1ppm, oxygen content <0.1ppm), mix ethylene glycol dimethyl ether and 1,3-dioxolane at a volume ratio of 1:1 and keep Stir, slowly add 1.0mol / L lithium bistrifluoromethanesulfonimide to the mixed solvent, then add lithium nitrate and 1.0% lithium difluorophosphate with a mass fraction of 2.0%, stir until completely dissolved, and obtain the present Example electrolyte.
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