Composition for electrode of nonaqueous electrolyte secondary battery, electrode for nonaqueous electrolyte secondary battery using the same and nonaqueous electrolyte secondary battery

1. A composition for an electrode of a nonaqueous electrolyte secondary battery, the composition comprising an active material and a binder resin, wherein

the binder resin comprises a vinylpyrrolidone-based polymer, and the hydroxyl group equivalent of the vinylpyrrolidone-based polymer is within the range of 250 to 2500;

wherein hydroxyl group equivalent means the molecular weight per hydroxyl group in the polymer calculated according to the following equation:

{ Hf ×(100/ Hw )}/ Hn

wherein Hf represents the molecular weight of monomer-giving hydroxyl groups in the polymer, Hn represents the number of hydroxyl groups contained in the monomer, and Hw represents the initial weight percentage (%) of the monomer serving as a source of hydroxyl groups in the polymer;

and wherein

“vinylpyrrolidone-based polymer” means a hydroxyl group-containing polyvinylpyrrolidone.

2. The composition for an electrode of a nonaqueous electrolyte secondary battery according to claim 1 , wherein the pyrrolidone equivalent of the vinylpyrrolidone-based polymer is within the range of 112 to 170;

wherein “pyrrolidone equivalent” means the molecular weight per pyrrolidone ring in the polymer calculated according to the following equation:

{ Pf ×(100/ Pw )}/ Pn

where Pf represents the molecular weight of monomer serving as a source of pyrrolidone in the polymer, Pn represents the number of pyrrolidone rings contained in the monomer, and Pw represents the initial mass percentage (%) of the monomer serving as a source of pyrrolidone in the polymer.

3. The composition for an electrode of a nonaqueous electrolyte secondary battery according to claim 1 , wherein the binder resin further comprises carboxymethyl cellulose and a latex binder.

4. The composition for an electrode of a nonaqueous electrolyte secondary battery according to claim 2 , wherein the binder resin further comprises carboxymethyl cellulose and a latex binder.

5. An electrode for a nonaqueous electrolyte secondary battery, wherein an active material layer formed using the composition for an electrode according to claim 1 is provided on a current collector.

6. An electrode for a nonaqueous electrolyte secondary battery, wherein an active material layer formed using the composition for an electrode according to claim 2 is provided on a current collector.

7. An electrode for a nonaqueous electrolyte secondary battery, wherein an active material layer formed using the composition for an electrode according to claim 3 is provided on a current collector.

8. An electrode for a nonaqueous electrolyte secondary battery, wherein an active material layer formed using the composition for an electrode according to claim 4 is provided on a current collector.

9. A nonaqueous electrolyte secondary battery comprising the electrode according to claim 5 and a nonaqueous electrolyte.

10. A nonaqueous electrolyte secondary battery comprising the electrode according to claim 6 and a nonaqueous electrolyte.

11. A nonaqueous electrolyte secondary battery comprising the electrode according to claim 7 and a nonaqueous electrolyte.

12. A nonaqueous electrolyte secondary battery comprising the electrode according to claim 8 and a nonaqueous electrolyte.

13. The nonaqueous electrolyte secondary battery according to claim 9 , wherein the electrode is used as a negative electrode.

14. The nonaqueous electrolyte secondary battery according to claim 10 , wherein the electrode is used as a negative electrode.

15. The nonaqueous electrolyte secondary battery according to claim 11 , wherein the electrode is used as a negative electrode.

16. The nonaqueous electrolyte secondary battery according to claim 12 , wherein the electrode is used as a negative electrode.