Sun Theo Constan Lotebulo Ndruru, Muhammad Yogi Saputra, Zurriyati Zurriyati, Atika Trisna Hayati, Risda Adriana, Muhammad Al Muttaqii, Edi Pramono, Sonny Widiarto, Marvin H. Pasaribu, Bernadeta Ayu Widyaningrum, Robertus Wahyu N. Nugroho, Deana Wahyuningrum, I Made Arcana
As a key component for the future high-safety lithium batteries, solid polymer electrolyte (SPE) is gaining an attractive momentum toward large-scale production due to their remarkable compatibility and processability with electrodes. Further, their excellent performance can be improved using the potential use of plasticizers. A deep eutectic solvent (DES) synthesized from choline chloride (ChCl) and citric acid monohydrate (CAM) demonstrates a promising plasticizer to design good SPE membranes along with poly (vinyl alcohol) (PVA). The changes in the surface chemistry of PVA-based membranes, as determined by Fourier transform infrared (FTIR) spectroscopy, confirm the success of DES-plasticizing effect, where detected by wavenumber shifting around main functional groups such as O-H, C-O, and C-O-C. Following this, EIS characterization on electrical properties reveals the role of 30 wt% DES in improving the ionic conductivity, with the highest ionic conductivity equivalent to 4.66 × 10−4 S cm−1 and the crystallinity index as high as 41.09%. The presence of LiClO4 and DES significantly reduces mechanical performance, and glass transition of PVA-based membranes, as characterized by tensile testing and differential thermal analysis/thermogravimetric analysis. Thus, the presence of DES in PVA and LiClO4 matrices could open another window for designing SPE with novel physicochemical properties. © 2024 Wiley Periodicals LLC.
Research Center for Chemistry, Research Organization for Nanotechnology and Materials, National Research and Innovation Agency of Indonesia, Banten, South Tangerang, Indonesia; Chemistry Department, Faculty of Science, Institut Teknologi Sumatera (ITERA), South Lampung, Lampung, Indonesia; Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Hasanuddin, South Sulawesi, Makassar, Indonesia; Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Central Java, Surakarta, Indonesia; Chemistry Department, Faculty of Mathematics and Sciences, Universitas Lampung, Lampung, Bandar Lampung, Indonesia; Chemistry Department, Faculty of Mathematics and Sciences, Universitas Palangka Raya, Central Kalimantan, Indonesia; Research Center for Biomass and Bioproducts, National Research and Innovation Agency, West Java, Cibinong, Indonesia; Organic Chemistry Division, Faculty of Mathematics and Sciences, Institut Teknologi Bandung, Indonesia, Bandung, Indonesia; Inorganic and Physical Chemistry Division, Faculty of Mathematics and Sciences, Institut Teknologi Bandung, Jawa Barat, Bandung, Indonesia