Method for producing lithium fluorosulfonate, lithium fluorosulfonate, nonaqueous electrolytic solution, and nonaqueous electrolytic solution secondary battery
The present invention relates to a method for producing lithium fluorosulfonate which comprises reacting a lithium salt and fluorosulfonic acid in a nonaqueous solvent, wherein the lithium salt is a lithium salt not generating water through the reaction step.
1. Lithium fluorosulfonate, having a molar content of sulfate ion of from 1.0×10 −5 mol/kg to 2.5×10 −1 mol/kg relative to the weight of the lithium fluorosulfonate.
2. A nonaqueous electrolytic solution, comprising:
the lithium fluorosulfonate of claim 1 dissolved in a nonaqueous solvent,
wherein the nonaqueous electrolytic solution contains the sulfate ion in an amount of from 1.0×10 −7 mol/L to 1.0×10 −2 mol/L.
3. A nonaqueous electrolytic solution, comprising:
the lithium fluorosulfonate of claim 1 ,
wherein the nonaqueous electrolytic solution is suitable for a nonaqueous electrolytic solution battery comprising a negative electrode capable of occluding and releasing lithium ions and a positive electrode.
4. The nonaqueous electrolytic solution according to claim 3 , further comprising:
a cyclic carbonate having a fluorine atom.
5. The nonaqueous electrolytic solution according to claim 4 , wherein the cyclic carbonate having a fluorine atom is included in the nonaqueous electrolytic solution in an amount of from 0.001% by mass to 85% by mass.
6. The nonaqueous electrolytic solution according to claim 3 , further comprising:
a cyclic carbonate having a carbon-carbon unsaturated bond.
7. The nonaqueous electrolytic solution according to claim 6 , wherein the cyclic carbonate having a carbon-carbon unsaturated bond is included in the nonaqueous electrolytic solution in an amount of from 0.001% by mass to 10% by mass.
8. The nonaqueous electrolytic solution according to claim 3 , further comprising:
a cyclic sulfonate ester.
9. The nonaqueous electrolytic solution according to claim 8 , wherein the cyclic sulfonate ester is included in the nonaqueous electrolytic solution in an amount of from 0.001% by mass to 10% by mass.
10. The nonaqueous electrolytic solution according to claim 3 , further comprising:
a compound having a cyano group.
11. The nonaqueous electrolytic solution according to claim 10 , wherein the compound having the cyano group is included in the nonaqueous electrolytic solution in an amount of from 0.001% by mass to 10% by mass.
12. The nonaqueous electrolytic solution according to claim 3 , further comprising:
a diisocyanate compound.
13. The nonaqueous electrolytic solution according to claim 12 , wherein the diisocyanate compound is included in the nonaqueous electrolytic solution in an amount of from 0.001% by mass to 5% by mass.
14. The nonaqueous electrolytic solution according to claim 3 , further comprising:
a lithium oxalate salt.
15. A nonaqueous electrolytic solution secondary battery, comprising:
a negative electrode and a positive electrode capable of occluding and releasing lithium ions; and
the nonaqueous electrolytic solution of claim 3 .
16. The nonaqueous electrolytic solution secondary battery according to claim 15 ,
wherein the negative electrode has a negative electrode active material layer on a current collector, and
the negative electrode active material layer contains a negative electrode active material that contains at least one of an elementary metal of silicon, an alloy of silicon, a compound of silicon, an elementary metal of tin, an alloy of tin, and a compound of tin.
17. The nonaqueous electrolytic solution secondary battery according to claim 15 ,
wherein the negative electrode has a negative electrode active material layer on a current collector, and
the negative electrode active material layer contains a negative electrode active material that contains a carbonaceous material.
18. The nonaqueous electrolytic solution secondary battery according to claim 15 ,
wherein the negative electrode has a negative electrode active material layer on a current collector, and
the negative electrode active material layer contains a negative electrode active material that contains a lithium titanium composite oxide.
19. The nonaqueous electrolytic solution secondary battery according to claim 15 ,
wherein the positive electrode has a positive electrode active material layer on a current collector, and
the positive electrode active material layer contains at least one selected from the group consisting of a lithium/cobalt composite oxide, a lithium/cobalt/nickel composite oxide, a lithium/manganese composite oxide, a lithium/cobalt/manganese composite oxide, a lithium/nickel composite oxide, a lithium/nickel/manganese composite oxide, and a lithium/nickel/cobalt/manganese composite oxide.
20. The nonaqueous electrolytic solution secondary battery according to claim 15 ,
wherein the positive electrode has a positive electrode active material layer on a current collector, and
the positive electrode active material layer contains LixMPO 4 where M represents at least one of a transition metal of Group 4 to Group 11 of the 4th Period of the Periodic Table, and 0<x<1.2.
21. A nonaqueous electrolytic solution, comprising:
the lithium fluorosulfonate of claim 1 dissolved in a nonaqueous solvent; and
a lithium salt other than lithium fluorosulfonate,
wherein the nonaqueous electrolytic solution is suitable for a nonaqueous electrolytic solution battery comprising a negative electrode and a positive electrode capable of occluding and releasing lithium ions,
the nonaqueous electrolytic solution contains the lithium fluorosulfonate in an amount of from 0.0005 mol/L to 0.5 mol/L, and
the nonaqueous electrolytic solution contains the sulfate ion in an amount of from 1.0×10 −7 mol/L to 1.0×10 −2 mol/L.
22. The nonaqueous electrolytic solution according to claim 21 , wherein the lithium salt other than lithium fluorosulfonate is at least one of LiPF 6 and LiBF 4 .
23. The lithium fluorosulfonate of claim 1 , which is in a crystal form.