Nonaqueous electrolytic solution and nonaqueous electrolytic solution secondary battery using same
The present invention relates to a nonaqueous electrolytic solution for use in a nonaqueous electrolytic solution secondary battery that comprises a negative electrode and a positive electrode capable of storing and releasing metal ions, and a nonaqueous electrolytic solution, wherein the nonaqueous electrolytic solution contains the specific compounds (A) and (B).
1. A nonaqueous electrolytic solution suitable for use in a nonaqueous electrolytic solution secondary battery that comprises a negative electrode and a positive electrode capable of storing and releasing metal ions, and the nonaqueous electrolytic solution, the nonaqueous electrolytic solution comprising, based on total nonaqueous electrolytic solution weight:
(A) a first compound (A) of formula (4), in a range of from 0.01 to 10 wt. %,
A 1 to A 6 being independently H, a halogen atom, a hydrocarbon group of 1 to 10 carbon atoms that may have a heteroatom, or an optionally substituted hydrogen silicide group of 1 to 10 silicon atoms, A 1 to A 6 optionally binding to one another to form a ring, wherein none of A 1 to A 6 is an aliphatic substituent having an unsaturated bond; and
(B) at least one second compound, in a range of from 0.01 to 2 wt. %, the second compound being selected from the group consisting of a difluorophosphate, a fluorosulfonate, and an imide salt,
wherein the nonaqueous electrolytic solution comprises no carbonate ester having a halogen atom.
2. The solution of claim 1 , further comprising:
a third compound, having a NCO group, of formula (3),
wherein
R 5 is an organic group of 1 to 20 carbon atoms, optionally having a branched structure or an aromatic group, and
Q is a hydrogen atom or an NCO group.
3. The solution of claim 1 , further comprising:
a monofluorophosphate.
4. The solution of claim 1 , wherein the second compound (B) comprises the difluorophosphate.
5. The solution of claim 1 , wherein the second compound (B) comprises the fluorosulfonate.
6. The solution of claim 1 , wherein the second compound (B) comprises the imide salt.
7. The solution of claim 1 , further comprising:
at least one fourth compound selected from the group consisting of ethynylethylene sulfate, propynyl vinyl sulfonate, and hexamethylene diisocyanate.
8. The solution of claim 1 , wherein the second compound (B) is at least one compound selected from the group consisting of lithium difluorophosphate, lithium fluorosulfonate, LiN(FSO 2 ) 2 , LiN(CF 3 SO 2 ) 2 , and LiN(C 2 F 5 SO 2 ) 2 .
9. The solution of claim 1 , wherein, in the first compound (A) of formula (4), A 1 to A 6 are independently H, methyl, ethyl, n-propyl, i-propyl, n-butyl, t-butyl, or phenyl.
10. The solution of claim 1 , wherein the first compound (A) is at least one selected from the group consisting of hexamethyldisilane, hexaethyldisilane, 1,2-diphenyltetramethyldisilane, and 1,1,2,2-tetraphenyldisilane.
11. The solution of claim 1 , comprising the first compound (A) is present in a range of from 0.01 to 2.0 wt. %, based on the total nonaqueous electrolytic solution weight.
12. The solution of claim 1 , further comprising:
lithium monofluorophosphate.
13. The solution of claim 1 , wherein second compound (B) is
14. The solution of claim 1 , wherein second compound (B) is
15. The solution of claim 1 , wherein second compound (B) is
16. The solution of claim 1 , wherein, in the first compound (A) of formula (4), A 1 to A 6 are independently H, methyl, ethyl, or phenyl.
17. The solution of claim 1 , wherein, in the first compound (A) of formula (4), A 1 to A 6 are independently H, methyl, or a substituted hydrogen silicide group of 1 silicon atom,
wherein at least one of A 1 to A 6 is H,
wherein at least one of A 1 to A 6 is methyl, and
wherein at least one of A 1 to A 6 is a substituted hydrogen silicide group of 1 silicon atom.
18. The solution of claim 1 , wherein the first compound (A) comprises
19. The solution of claim 18 , wherein the first compound (A) has only one Si—Si bond.
20. The solution of claim 1 , wherein the second compound (B) comprises
21. The solution of claim 1 , wherein the second compound (B) is at least one selected from the group consisting of
22. A nonaqueous electrolytic solution secondary battery, comprising:
a carbon-based negative electrode;
a positive electrode capable of storing and releasing metal ions; and
the nonaqueous electrolytic solution of claim 1 .