Solid Polymer Electrolyte for Lithium Batteries and Thermoelectric Materials Based on PVA-Pyrrole and PVA-Pyrrole-CNT (Carbon Nanotube)
Auliya Rahmawati, Prof. Dr. Iwan Sugihartono M.Si. , Prof.Yudianti

Department of Physics Education, Universitas Negeri Jakarta
Research Center for Nanotechnology, National Research and Innovation Agency (BRIN)

Abstract

This study was conducted as part of an internship program at the National Research and Innovation Agency BRIN from February to May 2025. The project focused on the synthesis and characterization of energy-related materials, specifically solid polymer electrolytes SPE for lithium batteries and thermoelectric materials based on PVA Pyrrole and PVA Pyrrole CNT.

The SPE was synthesized using polyethylene oxide PEO with lithium bis trifluoromethanesulfonyl imide LiTFSI, nanosilica, and nanocellulose. Electrochemical characterization was carried out using cyclic voltammetry CV, electrochemical impedance spectroscopy EIS, and galvanostatic charge discharge GCD to assess ionic conductivity and electrochemical stability. The sample with acid-treated nanosilica showed the highest ionic conductivity of 4 point 42 times 10 to the minus 5 S per cm.

Thermoelectric materials were prepared via in situ polymerization of PVA and pyrrole, with and without CNTs, and some were treated with hydrochloric acid HCl 0 point 08 M. The Seebeck coefficient was used to evaluate thermoelectric performance. The highest value of 6 point 82 millivolt per kelvin and power factor of 66 point 04 microwatt per meter kelvin squared were obtained from the CNT sample treated with HCl.

This internship provided practical experience in the development of environmentally friendly polymer-based materials for energy storage and conversion applications.

Keywords: Solid Polymer Electrolyte, Lithium Battery, PEO, LiTFSI, PVA-Pyrrole, Carbon Nanotube, Thermoelectric, Seebeck Coefficient, EIS

Topic: Material Physics