Additive for electrolyte solutions
The withstand voltage of an electrolyte solution is able to be increased by adding an additive for electrolyte solutions, which is composed of a compound that is configured from a silicon-containing sulfonate anion represented by formula (1) and a cation of, for example, a quaternary ammonium salt or a quaternary phosphonium salt, into the electrolyte solution. In the formula, each R independently represents an alkyl group having 1-8 carbon atoms; and n represents an integer of 2-6).
1. An additive for electrolyte solutions, comprising a compound constituted by a silicon-containing sulfonate anion represented by formula (1) and a monovalent cation:
wherein Rs each independently represent an alkyl group having 1 to 8 carbon atoms, and n represents an integer of 2 to 6, and
wherein the monovalent cation is selected from the group consisting of an alkali metal ion, and an imidazolium ion.
2. The additive for electrolyte solutions according to claim 1 , wherein all the Rs are methyl groups.
3. The additive for electrolyte solutions according to claim 1 , wherein the alkali metal ion is a sodium ion.
4. The additive for electrolyte solutions according to claim 1 , wherein the imidazolium ion is represented by formula (3):
wherein R 3 and R 4 each independently represent an alkyl group having 1 to 8 carbon atoms.
5. An electrolyte solution comprising: an additive; an organic solvent; and an electrolyte salt,
wherein the additive comprises a compound constituted by a silicon-containing sulfonate anion represented by formula (1) and a monovalent cation:
wherein Rs each independently represent an alkyl group having 1 to 8 carbon atoms, and n represents an integer of 2 to 6, and
wherein the monovalent cation is selected from the group consisting of an alkali metal ion, an imidazolium ion, and a quaternary phosphonium ion.
6. The electrolyte solution according to claim 5 , wherein the organic solvent is a carbonates solvent.
7. The electrolyte solution according to claim 6 , wherein the carbonates solvent is a mixed solvent.
8. An electric storage device constituted by using the electrolyte solution according to claim 5 .
9. The electric storage device according to claim 8 , which is a secondary battery or an electric double layer capacitor.
10. An electric storage device constituted by using an additive for electrolyte solutions, the additive comprising:
a compound constituted by a silicon-containing sulfonate anion represented by formula (1) and a monovalent cation:
wherein Rs each independently represent an alkyl group having 1 to 8 carbon atoms, and n represents an integer of 2 to 6, and
wherein the monovalent cation is selected from the group consisting of an alkali metal ion, an imidazolium ion, and a quaternary phosphonium ion.
11. A method, comprising adding an additive to an electrolyte solution containing a solvent and an electrolyte salt to improve a withstand voltage of the electrolyte solution,
wherein the additive comprises a compound constituted by a silicon-containing sulfonate anion represented by formula (1) and a monovalent cation:
wherein Rs each independently represent an alkyl group having 1 to 8 carbon atoms, and n represents an integer of 2 to 6, and
wherein the monovalent cation is selected from the group consisting of an alkali metal ion, an imidazolium ion, and a quaternary phosphonium ion.