Molten salt composition and use thereof
A molten salt composition is disclosed containing two or more types of molten salt MTFSI whose anion is an imide anion TFSI and whose cation is an alkali metal M exhibits a lower electrolyte melting point and a wider operating temperature range than a simple salt does. This brings about various advantages such as a wider range of materials that are chosen for use in batteries and the like.
1. A molten salt composition consisting essentially of two or more MTFSI molten salts whose anion is a substance TFSI represented by chemical formula (1) and whose cation is an alkali metal M
wherein two or more MTFSI molten salts are present in amounts of a eutectic composition or about a eutectic composition.
2. The molten salt composition as set forth in claim 1 , wherein the molten salt MTFSI is selected from the group consisting of LiTFSI, NaTFSI, KTFSI, RbTFSI, and CsTFSI.
3. The molten salt composition as set forth in claim 1 , wherein the molten salt composition is a binary system composition obtained by mixing two types of molten salt MTFSI, and is a LiTFSI—NaTFSI mixed system, a LiTFSI-KTFSI mixed system, a LiTFSI—CsTFSI mixed system, a NaTFSI-KTFSI mixed system, a NaTFSI—CsTFSI mixed system, or a KTFSI—CsTFSI mixed system.
4. An electrolyte containing a molten salt composition as set forth in claim 1 .
5. A battery containing an electrolyte as set forth in claim 4 .
6. The battery as set forth in claim 5 , wherein the battery is used in a temperature range of 110° C. to 350° C.
7. The battery as set forth in claim 6 , wherein the battery is a lithium battery, a sodium-sulfur battery, or a zebra battery.
8. A charging method comprising the step of performing charging with use of a battery as set forth in claim 5 .
9. An electrodeposition method comprising the step of depositing metal or ceramics with use of an electrolyte as set forth in claim 4 .
10. A film-forming method comprising the steps of:
depositing metal or ceramics with use of an electrolyte as set forth in claim 4 ; and
forming a film on a surface of a substance with use of the metal or ceramics thus deposited.
11. A surface-treating method comprising the steps of:
depositing metal or ceramics with use of an electrolyte as set forth in claim 4 ; and
treating a surface of a substance with use of the metal or ceramics thus deposited.