Organo sulfur-based electrode active material
Disclosed is an electrode active material that has a large charge discharge capacity, a high initial efficiency, as well as excellent cycle characteristics and rate characteristics and is favorably used in a non-aqueous electrolyte secondary battery. An organo sulfur-based electrode active material contains sodium and potassium in a total amount of 100 ppm by mass to 1000 ppm by mass; an electrode for use in a secondary battery, the electrode containing the organo sulfur-based electrode active material as an electrode active material; and a non-aqueous electrolyte secondary battery including the electrode. Preferably, the organo sulfur-based electrode active material further contains iron in an amount of 1 ppm by mass to 20 ppm by mass. Preferably, the organo sulfur-based electrode active material is sulfur-modified polyacrylonitrile, and the amount of sulfur in the organo sulfur-based electrode active material is 25 mass % to 60 mass %.
1. An organo sulfur-based electrode active material comprising sodium and potassium in a total amount of 100 ppm by mass to 1000 ppm by mass.
2. The organo sulfur-based electrode active material according to claim 1 , further comprising iron in an amount of 1 ppm by mass to 20 ppm by mass.
3. The organo sulfur-based electrode active material according to claim 1 , wherein the amount of sulfur in the organo sulfur-based electrode active material is 25 mass % to 60 mass %.
4. The organo sulfur-based electrode active material according to claim 1 , wherein the organo sulfur-based electrode active material is a sulfur-modified polyacrylonitrile.
5. An electrode for a secondary battery, comprising the organo sulfur-based electrode active material according to claim 1 as an electrode active material.
6. A non-aqueous electrolyte secondary battery, comprising the electrode for a secondary battery according to claim 5 as a positive electrode.
7. A non-aqueous electrolyte secondary battery, comprising the electrode for a secondary battery according to claim 5 as a negative electrode.
8. A method for producing a sulfur-modified polyacrylonitrile containing sodium and potassium in a total amount of 100 ppm by mass to 1000 ppm by mass, the method comprising:
a step of heating a mixture of a polyacrylonitrile containing sodium and potassium in a total amount of 126 ppm by mass to 2360 ppm by mass and elemental sulfur in a non-oxidizing atmosphere.
9. The organo sulfur-based electrode active material according to claim 2 , wherein the amount of sulfur in the organo sulfur-based electrode active material is 25 mass % to 60 mass %.
10. The organo sulfur-based electrode active material according to claim 2 , wherein the organo sulfur-based electrode active material is a sulfur-modified polyacrylonitrile.
11. The organo sulfur-based electrode active material according to claim 3 , wherein the organo sulfur-based electrode active material is a sulfur-modified polyacrylonitrile.
12. An electrode for a secondary battery, comprising the organo sulfur-based electrode active material according to claim 2 as an electrode active material.
13. An electrode for a secondary battery, comprising the organo sulfur-based electrode active material according to claim 3 as an electrode active material.
14. An electrode for a secondary battery, comprising the organo sulfur-based electrode active material according to claim 4 as an electrode active material.
15. The organo sulfur-based electrode active material according to claim 9 , wherein the organo sulfur-based electrode active material is a sulfur-modified polyacrylonitrile.
16. An electrode for a secondary battery, comprising the organo sulfur-based electrode active material according to claim 9 as an electrode active material.
17. An electrode for a secondary battery, comprising the organo sulfur-based electrode active material according to claim 10 as an electrode active material.
18. An electrode for a secondary battery, comprising the organo sulfur-based electrode active material according to claim 11 as an electrode active material.
19. An electrode for a secondary battery, comprising the organo sulfur-based electrode active material according to claim 15 as an electrode active material.