A VO2 based hybrid super-capacitor utilizing a highly concentrated aqueous electrolyte for increased potential window and capacity
作者： Simon Lindberg , Ndeye Maty Ndiaye , Ncholu Manyala , Patrik Johansson , Aleksandar Matic
DOI: 10.1016/J.ELECTACTA.2020.136225
关键词: Supercapacitor 、 Chemical engineering 、 Voltage 、 Work (thermodynamics) 、 Materials science 、 Sodium 、 Fade 、 Current density 、 Electrolyte 、 Dissolution
摘要: Abstract In this work we demonstrate the application of a highly concentrated aqueous electrolyte to hybrid supercapacitor cell. We combine an 8 m Sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) with nanostructured VO2-cathode enhance voltage widow up 2.4 V in full With enhanced potential window, are able exploit contribution VO2 material, where part is outside stability window standard alkaline electrolytes. show that material provides faradaic even at highest current density (25 A/g) and way increases energy content also high power conditions. The cell shows good efficiency but capacity fade over 500 cycles (39%) which most likely related dissolution VO2.
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