Structural Studies on NaFePO_4 as a Cathode Material for Na~+/Li~+ Mixed-Ion Batteries

摘要

NaFePO_4 has been synthesized via the Pechini process and the resulting sample was characterized using X-ray diffraction and thermogravimetric analysis. Electrochemical properties have been investigated for possible application as cathode in sodium-ion battery. This sample was made into electrode in a coin cell with LiPF_6 in organic carbonates as the electrolyte and lithium metal as the counter electrode. Charge/discharge behavior, cyclic voltammetry, and in-situ frequency response analysis were performed. The results obtained demonstrate constant or increase in capacity and consistently low internal resistance with consecutive cycles.