Hydrothermal synthesis of iron and zinc double vanadium oxddes using the tetramethyl ammonium ion

We have studied the hydrothermal synthesis of tetramethyl ammonium vanadium oxides that contain an additional transition metal, such as iron or zinc, in order to stabilize the layered structure of vanadium oxide for electrochemcial redox reactions with lithium. Addition of the lower cost iron and zinc is also beneficial for commercial application. Several new layered structures which contain double sheets of V2O5 have been formed and characterized. The iron compound contains the TMA ion. Their structures and electrochemical behavior are reported.