The current organic electrolytes used for energy storage applications suffer from volatility, flammability, and limited cyclability at elevated temperatures. Ionic liquids being non-flammable and non-volatile are an ideal replacement for the unsafe organic solvents used today. The performance of supercapacitors and lithium ion batteries containing piperidinium based ionic liquids (IL) and 1 M lithium bis(trifluoromethylsulfonyl)imide are compared to the traditional propylene carbonate (PC) electrolyte at 25 oC and 100 oC. An activated carbon electrode based supercapacitor with the ILs at 100 oC cycles for more than 10000 cycles with a decrease of 30% capacitance in comparison to PC which fails at 3200 cycles. A 3.5 X improvement in energy density for the IL based supercapacitor is observed upon going from room temperature to 100 oC. Studies on piperidinium ILs as electrolytes in lithium ion batteries using a lithium metal anode and lithium cobalt oxide cathode at 100 oC are ongoing. These successful findings support the basis for the replacement of organic electrolytes with IL based electrolytes in energy storage devices at high temperatures.

Piperidinium ionic liquids as electrolytes in supercapacitors and lithium ion batteries at elevated temperatures

256th National Meeting (2018)

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