Rechargeable Alkaline Metal Batteries with Mixed Amide Electrolytes

Mixed alkaline metal amide salts have been developed for the rechargeable alkaline metal batteries operating below 200 ºC. For lithium batteries, ternary systems were selected for lowering melting temperature and viscosity. For the sodium batteries, binary systems satisfy the requirements for the cell operation. These electrolytes are non-flammable and possess high thermal stability giving high safety to battery packs compared to the conventional organic electrolytes in case of applications of large scale such as HEVs and storage of surplus electricity. Molten (Li,K,Cs)TFSA (TFSA: bis(trifluoro-methylsulfonyl)amide, Li:K:Cs = 20:10:70 in molar ratio) was selected as an electrolyte of a rechargeable lithium metal battery taking account the meltin