Nonaqueous electrolyte solution and lithium secondary battery using same
View Patent ↗A non-aqueous electrolyte solution containing a lithium salt, a non-aqueous solvent, and a compound expressed by the following formula (IIc): wherein Z 6 represents an integer of 2 or larger, X 6 represents a Z 6 -valent hydrocarbon group having 2-6 carbon atoms, R 61 represents, independently of each other, an alkyl group having 1-6 carbon atoms, R 62 represents, independently of each other, an alkyl group having 1-6 carbon atoms substituted by one or more halogen atoms and any two or more of R 61 and/or R 62 may be linked with each other to form a ring.
1. A non-aqueous electrolyte solution comprising:
a lithium salt;
a non-aqueous solvent; and
a compound expressed by the following general formula (IIc) in a concentration of 0.01 weight % to 4 weight % with respect to the non-aqueous electrolyte solution
wherein Z 6 represents an integer of 2 or larger, X 6 represents a Z 6 -valent hydrocarbon group having 1-6 carbon atoms, R 61 represents, independently of each other, an alkyl group having 1-6 carbon atoms, R 62 represents, independently of each other, an alkyl group having 1-6 carbon atoms substituted by one or more halogen atoms and any two or more of R 61 and/or R 62 may be linked with each other to form a ring.
2. 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 5 weight % with respect to the non-aqueous electrolyte solution.
3. The non-aqueous electrolyte solution of claim 2 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.
4. The non-aqueous electrolyte solution of claim 2 , wherein the cyclic carbonate compound is vinylene carbonate.
5. The non-aqueous electrolyte solution of claim 1 , wherein Z 6 is an integer of from 2 to 4.
6. The non-aqueous electrolyte solution of claim 1 , wherein R 61 is at least one selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a cyclopentyl group and a cyclohexyl group.
7. The non-aqueous electrolyte solution of claim 1 , wherein R 62 is selected from the group consisting of a fluoromethyl group, a difluoromethyl group, a trifluoromethyl group, a 1-fluoroethyl group, a 2-fluoroethyl group, a 2,2-difluoroethyl group, a 2,2,2-trifluoroethyl group, a pentafluoroethyl group and a heptafluoropropyl group.
8. The non-aqueous electrolyte solution of claim 1 , wherein X 6 is a hydrocarbon having from 1 to 3 carbon atoms.
9. The non-aqueous electrolyte solution of claim 1 , wherein the molecular weight of compound (IIc) is from 150 to 1000.
10. The non-aqueous electrolyte solution of claim 1 , wherein the compound of formula (IIc) is selected from the group consisting of:
11. The non-aqueous electrolyte solution of claim 1 , wherein the compound of formula (IIc) is selected from the group consisting of:
12. The non-aqueous electrolyte solution of claim 1 , wherein the compound (IIc) is present in an amount of from 0.1 wt % to 2 wt %.
13. 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 .