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Biodegradable porous polylactic acid film as a separator for supercapacitors
Author(s) -
Vargun Elif,
Ozaltin Kadir,
Fei Haojie,
Harea Evghenii,
Vilčáková Jarmila,
Kazantseva Natalia,
Saha Petr
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49270
Subject(s) - polylactic acid , materials science , scanning electron microscope , contact angle , porosity , separator (oil production) , wetting , chemical engineering , dielectric spectroscopy , composite material , electrochemistry , polymer chemistry , polymer , electrode , chemistry , physics , engineering , thermodynamics
A porous polylactic acid (PLA) film was investigated as a separator for supercapacitors (SCs) and compared with commercial separators, for example, NKK‐MPF30AC and Celgard 2400. The porous PLA film was fabricated via a facile phase inversion method, and the cross‐sectional scanning electron microscope images of the PLA separator film exhibited highly porous interconnected morphology for ion diffusion. The surface modification of separators was performed by radio frequency (RF) air plasma to improve wettability. The plasma modification enhanced the water uptake and swelling properties of the separators and decreased the water contact angles of PLA and Celgard 2400 films. The mechanical and dielectric properties of separators were also studied. The ionic conductivities of RF‐PLA in 1 M H 2 SO 4 and 1 M Na 2 SO 4 were found to be 1.1 × 10 −1 S/cm and 0.6 × 10 −2 S/cm at room temperature, respectively. The electrochemical impedance spectroscopy of the RF‐PLA SCs showed the lowest solution resistance and internal resistance.