Crosslinked Polymer Ionic Liquid/Ionic Liquid Blends Prepared by Photopolymerization as Solid-State Electrolytes in Supercapacitors

• Published in: Nanomaterials (Basel, Switzerland) Vol. 8; no. 4; p. 225
• Main Authors: Wang, Po-Hsin, Wang, Tzong-Liu, Lin, Wen-Churng, Lin, Hung-Yin, Lee, Mei-Hwa, Yang, Chien-Hsin
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 07.04.2018; MDPI
• Subjects: Anions; Capacitance; Cations; Crosslinking; Electrochemistry; Electrolytes; Flux density; Imidazole; ionic liquid; Ionic liquids; Ions; Maximum power density; Molten salt electrolytes; Nanoparticles; Photopolymerization; Polyelectrolytes; Polymer blends; polymer ionic liquid; Polymers; solid electrolyte; Solid electrolytes; Solid state; Solvents; supercapacitor; Supercapacitors; ionic liquid; photopolymerization; polymer ionic liquid; solid electrolyte; supercapacitor
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano8040225

A photopolymerization method is used to prepare a mixture of polymer ionic liquid (PIL) and ionic liquid (IL). This mixture is used as a solid-state electrolyte in carbon nanoparticle (CNP)-based symmetric supercapacitors. The solid electrolyte is a binary mixture of a PIL and its corresponding IL. The PIL matrix is a cross-linked polyelectrolyte with an imidazole salt cation coupled with two anions of Br in PIL-M-(Br) and TFSI in PIL-M-(TFSI), respectively. The corresponding ionic liquids have imidazolium salt cation coupled with two anions of Br and TFSI , respectively. This study investigates the electrochemical characteristics of PILs and their corresponding IL mixtures used as a solid electrolyte in supercapacitors. Results show that a specific capacitance, maximum power density and energy density of 87 and 58 F·g ¹, 40 and 48 kW·kg ¹, and 107 and 59.9 Wh·kg ¹ were achieved in supercapacitors based on (PIL-M-(Br)) and (PIL-M-(TFSI)) solid electrolytes, respectively.