Ut-battelle, Inc.

Rose E Ruther

Frank M Delnick

Jagjit Nanda

Che-Nan Sun

A supercapacitor according to the present invention includes a negative carbon-comprising electrode which does not intercalate sodium, and a positive carbon-comprising electrode. An electrolyte composition comprises sodium hexafluorophosphate and a non-aqueous solvent comprising at least one selected from the group consisting of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether. The supercapacitor has an electrochemical voltage window of from +0.0 V to 3.5 V (full cell voltage). The electrolyte has an electrochemical voltage window of from +0.05 V to 3.9 V vs. Na/Na+. A method of making and a method of operating a supercapacitor is also disclosed.

High voltage window electrolyte for supercapacitors

A supercapacitor and a related electrolyte composition suitable for use in a supercapacitor are provided. An electrolyte composition can include a conductive sodium salt component comprising NaTFSI and a non-aqueous solvent component comprising dimethoxy ethane (DME). The conductive sodium salt component and the non-aqueous solvent component can be present at a molar ratio of NaTFSI:DME of 1:1 to 1:3, inclusive.

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Oak Ridge, TN, United States of America

Rose E Ruther