Composite sulfide electrode and manufacturing method therefor
A composite sulfide electrode and a manufacturing method therefor are disclosed. A method for manufacturing a composite sulfide electrode comprises the steps of: preparing a mixed solution of polyacrylonitrile (PAN) and a metallic oxide; stirring the prepared mixed solution; electrospinning the stirred mixed solution to prepare a wire-type precursor bearing a metallic oxide in PAN; drying the prepared wire-type precursor; mixing the dried wire-type precursor and a sulfur powder; and injecting a gas to the mixture of the wire-type precursor and the sulfur powder to sulfurize the wire-type precursor.
1. A manufacturing method for a composite sulfide electrode, the method comprising:
producing a mixed solution of polyacrylonitrile (PAN) and a metal oxide;
stirring the produced mixed solution;
electrospinning the stirred mixed solution to produce a wire type precursor including the metal oxide in PAN;
drying the produced wire type precursor;
mixing the dried wire type precursor and sulfur powder;
thermally treating a mixture of the wire type precursor and the sulfur powder to sulfurize the wire type precursor and then obtaining a sulfurized polyacrylonitrile (SPAN) incorporating metal sulfide; and
thermally decomposing the SPAN to obtain a metal sulfide-incorporated sulfurized carbon composite.
2. The manufacturing method for a composite sulfide electrode of claim 1 , wherein in the producing of a mixed solution, the PAN and the metal oxide are mixed at a ratio of 5:1 to 1:5.
3. The manufacturing method for a composite sulfide electrode of claim 1 , wherein in the mixing of the dried wire type precursor and sulfur powder, the dried wire type precursor and the sulfur powder are mixed at a ratio of 1:1 to 1:9.
4. The manufacturing method for a composite sulfide electrode of claim 1 , wherein in the sulfurizing, the wire type precursor is sulfurized under an argon atmosphere at a temperature of 500° C. to 700° C. for 5 hours to 7 hours.
5. The manufacturing method for a composite sulfide electrode of claim 1 , wherein the metal oxide includes a metal component such as Fe, Ni, Co, or Cu.
6. A composite sulfide electrode manufactured by the method of claim 1 .
7. The composite sulfide electrode of claim 6 , wherein the composite sulfide electrode includes an active material in the form of fibers, and the active material in the form of fibers includes sulfurized polyacrylonitrile (SPAN) and a metal sulfide included in the form of particles inside the SPAN,
wherein the SPAN is a disordered carbon material.
8. The composite sulfide electrode of claim 7 , wherein the metal sulfide is a metal component such as Fe, Ni, Co, or Cu bonded to a sulfur component.
9. The manufacturing method for a composite sulfide electrode of claim 1 , wherein the metal sulfide-incorporated sulfurized carbon composite is a disordered carbon material incorporating the metal sulfide.
10. The composite sulfide electrode of claim 6 , wherein the metal sulfide is embedded in a disordered carbon fiber matrix.
11. The composite sulfide electrode of claim 6 , wherein the composite sulfide electrode has X-ray diffraction peak at 24-28°.
12. The composite sulfide electrode of claim 6 , wherein the metal sulfide is FeS or FeS 2 .
13. The composite sulfide electrode of claim 6 , wherein the composite sulfide electrode does not comprise a binder.
14. The composite sulfide electrode of claim 6 , wherein the composite sulfide electrode does not comprise a conductive material.
15. The composite sulfide electrode of claim 6 , wherein the composite sulfide electrode has an X-ray diffraction pattern without a crystalline peak of a sulfur element.