Fast-charging, high-energy, flexible lithium-sulfur batteries based on hierarchically ordered sulfur particles and preparation method thereof
AssigneePostech Research and Business Development Foundation
InventorsMoon Jeong PARK, Han Eol Kang
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Abstract
The present disclosure relates to a cathode active material for a secondary battery, comprising a poly(S-co-VPA) vulcanized polymer, a preparation method thereof, and a lithium-sulfur secondary battery comprising the same.
Claims5
A method for preparing a cathode active material for a secondary battery, comprising a poly (S-co-VPA) vulcanized polymer, the method comprising the steps of:
- 1) mixing sulfur and vinylphosphonic acid, and stirring the mixture for 20 to 60 minutes while heating the mixture to 150° C. to 180° C.;
- 2) adding the mixture of the step 1) to vinylphosphonic acid to terminate the reaction, and obtaining particles;
- and
- 3) washing the obtained particles.
A poly(S-co-VPA) vulcanized polymer which is spherical particles having a diameter of 50 to 800 microns, has a three-dimensional porous network formed throughout the particles thereof, and comprises 40 to 70% by weight of sulfur and 30 to 60% by weight of vinylphosphonic acid (VPA).
Dependencies are inferred from the claim text.