Nonaqueous electrolyte solution and lithium secondary battery using same

1. A non-aqueous electrolyte solution comprising:

a lithium salt;

at least one non-aqueous solvent selected from the group consisting of a chain carbonate, a cyclic carbonate, a chain carboxylic acid ester, a cyclic carboxylic acid ester, a chain ether and a cyclic ether; and

a compound expressed by the following formula (IIa)

 wherein R 41 -R 52 independently of each other, represent a hydrogen atom, an alkyl group having 1-12 carbon atoms that may be substituted by a fluorine atom, an alkenyl group having 2-12 carbon atoms that may be substituted by a fluorine atom, an aryl group having 6-12 carbon atoms that may be substituted by a fluorine atom, or an aralkyl group having 7-12 carbon atoms that may be substituted by a fluorine atom, wherein each group R 41 -R 52 may have an ether linkage in its chain, and R 41 may be linked with R 42 , and R 43 may be linked with R 44 , to form a ring, said ring optionally comprising an oxygen atom.

2. The non-aqueous electrolyte solution according to claim 1 , wherein the groups R 41 -R 52 of the compound of formula (IIa) represent, independently of each other, a hydrogen atom, an unsubstituted alkyl group having 1-12 carbon atoms, an unsubstituted alkenyl group having 2-12 carbon atoms, an unsubstituted aryl group having 6-12 carbon atoms, or an unsubstituted aralkyl group having 7-12 carbon atoms, wherein each group R 41 -R 52 may have an ether linkage in its chain, and R 41 may be linked with R 42 , and R 43 may be linked with R 44 , to form a ring, said ring optionally comprising an oxygen atom.

3. The non-aqueous electrolyte solution of claim 1 , wherein

the compound expressed by the formula (IIa) is a compound expressed by the following general formula (IIa′)

 wherein R 41 -R 44 represent, independently of each other, a hydrogen atom, an alkyl group having 1-12 carbon atoms that may be substituted by a fluorine atom, an alkenyl group having 2-12 carbon atoms that may be substituted by a fluorine atom, an aryl group having 6-12 carbon atoms that may be substituted by a fluorine atom, or an aralkyl group having 7-12 carbon atoms that may be substituted by a fluorine atom wherein each group may have an ether linkage in its chain, and R 41 may be linked with R 42 , and R 43 may be linked with R 44 , to form a ring, said ring optionally comprising an oxygen atom.

4. The non-aqueous electrolyte solution of claim 3 , wherein the concentration of the compound having the structure expressed by the formula (IIa′) with respect to the non-aqueous electrolyte solution is 0.001 weight % to 5 weight %.

5. The non-aqueous electrolyte solution of claim 1 , wherein the concentration of the compound having the structure expressed by the formula (IIa) with respect to the non-aqueous electrolyte solution is 0.001 weight % to 5 weight %.

6. The non-aqueous electrolyte solution of claim 1 , wherein the compound of formula (IIa) is present in an amount of from 0.1 weight % to 2 weight %.

7. The non-aqueous electrolyte solution of claim 1 , wherein the compound of formula (IIa) is 2,4,8,10-tetraoxaspiro[5.5]undecane.

8. The non-aqueous electrolyte solution of claim 1 , wherein the compound of formula (IIa) is at least one selected from the group consisting of 2,4,8,10-tetraoxaspiro[5.5]undecane, 3,9-dimethyl-2,4,8,10-tetraoxaspiro[5.5]undecane, 3,9-diethyl-2,4,8,10-tetraoxaspiro[5.5]undecane, 3,9-dipropyl-2,4,8,10-tetraoxaspiro[5.5]undecane, 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane, 3,9-di-1-propenyl-2,4,8,10-tetraoxaspiro[5.5]undecane, and 3,9-di-2-propenyl-2,4,8,10-tetraoxaspiro[5.5]undecane, 2,4,8,10-tetraoxaspiro[5.5]undecane and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane.

9. The non-aqueous electrolyte solution of claim 1 , wherein the compound of formula (IIa) is at least one selected from the group consisting of 2,4,8,10-tetraoxaspiro[5.5]undecane and 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane.

10. The non-aqueous electrolyte solution of claim 1 , wherein the compound of formula (IIa) has a molecular weight of from 160 to 650.

11. The non-aqueous electrolyte solution of claim 1 , comprising a complex of the lithium salt in the compound of formula (IIa).

12. The non-aqueous electrolyte solution of claim 1 , which is free of dioxolane, tetrahydrofuran, and tetrahydropyran.

13. The non-aqueous electrolyte solution of claim 1 , further comprising a cyclic carbonate compound having an unsaturated bond in a concentration of 0.01 weight % to 8 weight % with respect to the non-aqueous electrolyte solution.

14. The non-aqueous electrolyte solution of claim 13 , wherein the cyclic carbonate compound having an unsaturated bond is a compound or a plurality of compounds selected from the group consisting of vinylene carbonate, vinyl ethylene carbonate, divinyl ethylene carbonate, vinyl vinylene carbonate and methylene ethylene carbonate.

15. The non-aqueous electrolyte solution according to claim 1 , comprising ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate, vinylene carbonate, 3,9-divinyl-2,4,8,10-tetraoxaspiro[5.5]undecane and LiPF 6 .

16. A lithium secondary battery comprising:

a non-aqueous electrolyte solution; and a positive electrode and a negative electrode capable of absorbing and desorbing lithium ions; wherein the non-aqueous electrolyte solution is the non-aqueous electrolyte solution of claim 1 .