Details

Autor(en) / Beteiligte

• Rustomji, Cyrus S.
• Yang, Yangyuchen
• Kim, Tae Kyoung
• Mac, Jimmy
• Kim, Young Jin
• Caldwell, Elizabeth
• Chung, Hyeseung
• Meng, Y. Shirley

Titel

Liquefied gas electrolytes for electrochemical energy storage devices

Ist Teil von

• Science (American Association for the Advancement of Science), 2017-06, Vol.356 (6345)

Ort / Verlag

United States: AAAS

Erscheinungsjahr

2017

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• Electrochemical capacitors and lithium-ion batteries have seen little change in their electrolyte chemistry since their commercialization, which has limited improvements in device performance. Combining superior physical and chemical properties and a high dielectric-fluidity factor, the use of electrolytes based on solvent systems that exclusively use components that are typically gaseous under standard conditions show a wide potential window of stability and excellent performance over an extended temperature range. Electrochemical capacitors using difluoromethane show outstanding performance from –78° to +65°C, with an increased operation voltage. The use of fluoromethane shows a high coulombic efficiency of ~97% for cycling lithium metal anodes, together with good cyclability of a 4-volt lithium cobalt oxide cathode and operation as low as –60°C, with excellent capacity retention.