Fast aging spectroscopy impedance analyses of carbon electrodes supercapacitors with organic electrolyte at 3.8V and 100°C
Carregando...
Data
Data de publicação
2022
Autores IPEN
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24.
Exportar
Resumo
Carbon-based electrochemical supercapacitors are tight to a rigidly specification of maximum
operating potential and temperature (label nominal ratings). Due the high conductivity, common
electrolytes in these cells are tetraethylammonium tetrafluoroborate salt (NEt4BF4) in acetonitrile
(ACN) or propylene carbonate (PC). Nevertheless, these highly volatile liquids are very sensitive to
exciding nominal specifications of potential and temperature. The supercapacitor damage is caused
by electrolyte decomposition at higher potentials and cell expansion with elevated temperature.
Electrolyte decomposition products are very active and are most prone to react to the carbon
electrode. This further causes aging of the electrochemical supercapacitor. In this investigation, the
equivalent series resistances (ESR) of activated carbon-based electrodes of supercapacitors
produced with organic electrolyte have been investigated using electrochemical impedance
spectroscopy (EIS). Commercial supercapacitors have been submitted to a maximum potential of
3.8 V during cyclic voltammetry tests. Internal series resistances of the supercapacitors were
measured using EIS at room temperature and at 100°C. Even with short period of time during cyclic
voltammetry tests, the internal resistance increase substantially with operating temperature and
also with a potential above the nominal ratings (2.75V). It has also been shown that the specific
capacitance decreased in these extreme conditions causing fast aging even on short time interval.
Como referenciar
SILVA, L.S.; CASINI, J.C.; GALEGO, E.; FARIA, R.N. Fast aging spectroscopy impedance analyses of carbon electrodes supercapacitors with organic electrolyte at 3.8V and 100°C. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... Disponível em: http://repositorio.ipen.br/handle/123456789/33793. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.