Ionic conduction properties of CMC-Na/NaFSI composite PEO solid polymer electrolytes and interfacial electrochemical reaction between the electrolytes and cemented carbides

抄録

The purpose of this study is to investigate the effect of several additives on the ionic conductivity of polyethylene oxide (PEO). The fabrication and characterization of sodium carboxymethylcellulose (CMC-Na) composite PEO solid electrolytes with sodium bis(fluorosulfonyl)imide (NaFSI) as sodium salt were investigated. The prepared PEO electrolyte films were subjected to AC impedance measurements to measure their resistance, and the ionic conductivity was calculated from the results. The ionic conductivity was significantly enhanced by the addition of NaFSI, reaching a maximum of 8.66×10^-5 S/cm, but the ionic conductivity decreased after a certain concentration. This may be due to the fact that the ionic conductivity increases with increasing concentration due to the increase in carrier ions, but above a certain concentration, the glass transition temperature increases due to the increase in complexes. Interfacial electrochemical reactions between PEO and cemented carbide were Co dissolution and WC oxidation.