Secondary battery

1. A secondary battery, comprising an electrode assembly in which a positive electrode and a negative electrode are arranged to face each other, an electrolyte liquid, and a package accommodating the electrode assembly and the electrolyte liquid,

wherein the negative electrode is formed by binding a negative electrode active substance containing at least one selected from a metal (a) capable of being alloyed with lithium, and a metal oxide (b) capable of occluding and releasing lithium ions, to a negative electrode current collector with a negative electrode binder, and

the electrolyte liquid comprises a sulfide compound;

wherein the sulfide compound is represented by general formula (1):

R 1 S—R 2   (1)

wherein R 1 and R 2 each independently denote a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkenyl group, or a substituted or unsubstituted alkynyl group; and

wherein the sulfide compound comprises a fluorine atom.

2. The secondary battery according to claim 1 , wherein a content of the sulfide compound is 0.1 to 30% by mass with respect to the total amount of the sulfide compound and a nonaqueous electrolyte solvent contained in the electrolyte liquid.

3. The secondary battery according to claim 1 , wherein the negative electrode active substance further comprises a carbon material (c) capable of occluding and releasing lithium ions.

4. The secondary battery according to claim 1 , wherein the negative electrode active substance comprises at least the metal oxide (b).

5. The secondary battery according to claim 4 , wherein the whole or a part of the metal oxide (b) has an amorphous structure.

6. The secondary battery according to claim 1 , wherein the negative electrode active substance comprises at least the metal (a).

7. The secondary battery according to claim 6 , wherein the metal (a) is silicon.

8. The secondary battery according to claim 1 ,

wherein the negative electrode active substance comprises the metal (a) and the metal oxide (b), and

the metal oxide (b) is an oxide of a metal constituting the metal (a).

9. The secondary battery according to claim 1 ,

wherein the negative electrode active substance comprises the metal (a) and the metal oxide (b), and

the whole or a part of the metal (a) is dispersed in the metal oxide (b).

10. The secondary battery according to claim 1 , wherein the negative electrode binder is polyimide or polyamideimide.

11. The secondary battery according to claim 1 , wherein the electrode assembly has a planar stacked structure.

12. The secondary battery according to claim 1 , wherein the package is an aluminum laminate film.

13. The secondary battery according to claim 1 , wherein a content of the sulfide compound is 0.1 to 30% by mass with respect to the total amount of the sulfide compound and a nonaqueous electrolyte solvent contained in the electrolyte liquid.

14. The secondary battery according to claim 1 , wherein the negative electrode active substance comprises the metal (a) and the metal oxide (b), and further comprises a carbon material (c) capable of occluding and releasing lithium ions, and

the metal (a) is silicon, and the metal oxide (b) is silicon oxide, and the whole or a part of the metal (a) is dispersed in the metal oxide (b).

15. The secondary battery according to claim 1 , wherein the negative electrode active substance comprises the metal (a) and the metal oxide (b), and further comprises a carbon material (c) capable of occluding and releasing lithium ions, and

the metal (a) is silicon, and the metal oxide (b) is silicon oxide, and the whole or a part of the metal (a) is dispersed in the metal oxide (b).