As electrolytes for sodium secondary batteries, we have developed several amide ionic liquids, such as Na[FSA]-K[FSA] (FSA: bis(fluorosulfonyl)amide) and Na[FSA]-[C3C1pyrr][FSA] (C3C1pyrr: N-methyl-N-propylpyrrolidinium). Figure 1 shows charge-discharge curves for a NaCrO2 positive electrode in Na[FSA]-[C3C1pyrr][FSA] at 253-363 K. Reversible capacities over 110 mAh g-1 are obtained at 298-363 K. Even at a very low temperature of 253 K, the cell can be operated. Hard carbon negative electrode also exhibits a satisfactory performance in Na[FSA]-[C3C1pyrr][FSA] at 363 K (Figure 2). Large-sized full-cells consisting of NaCrO2and hard carbon also show good performance and cycleability. 

Sodium secondary batteries with amide ionic liquids

248th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.