Screening electrolytes designed for high voltage electrochemical capacitors
نویسندگان
چکیده
Standard acetonitrile/tetraalkylammonium-tetrafluoroborate-based electrochemical capacitor electrolytes were modified with both fluorinated additives (including analogs of ethylmethyl carbonate and diethyl carbonate, lithium difluoro(oxalato)borate, tris(2,2,2-trifluoroethyl) phosphite) spiro(1,1?)-bipyrrolidinium tetrafluoroborate salt, to improve stability at higher voltages (>2.7 V). Compounds investigated included (2,2,2-trifluoroethyl) methyl (TFEMC), ethyl(2,2,2-trifluoroethyl) (ETFEC), bis(2,2,2-trifluoroethyl) (bTFEC), difluoro(oxalato)borate (LiDFOB), phosphite (TTFEPi). Screening in prototype coin cells using constant current cycling voltage hold test protocols revealed good retention capacitance a reduced cell internal resistance growth when operating maximum between 3.5 4.0 V. These results suggest new strategies for increasing the limits electric double-layer type supercapacitors, increase stored energy their compatibility lithium-ion battery use hybrid configurations.
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ژورنال
عنوان ژورنال: Electrochimica Acta
سال: 2021
ISSN: ['1873-3859', '0013-4686']
DOI: https://doi.org/10.1016/j.electacta.2021.137898