Study on All Solid Lithium Polymer Batteries with the LiFePO₄/C Cathode

Abstract

The interfacial resistance between the PEO-Li(CF₃SO₂)₂N electrolyte and the Li_xFePO₄ cathode was examined as a function of the content of Li(CF₃SO₂)₂N in PEO and x in Li_xFePO₄. The interfacial resistances were attributed to two parts; one is the interfacial layer produced between the polymer electrolyte and the cathode, and the other is the charge transfer resistance between the interfacial layer and the electrode. The charge transfer resistance increased with increasing x. No significant dependence of the activation energy for the charge transfer resistance on the salt content in PEO and the molecular weight of PEO were observed.