Preparation of sodium molybdenum oxides by a solution technique and their electrochemical performance in lithium intercalation

Abstract

Several sodium molybdenum oxides with different structures were prepared by acidification of Na 2MoO 4 solutions with 1–3.5 N of strong acids (HCl, HNO 3) at 100°C followed by heat treatment. Structural and compositional analyses of the oxides show that their structures were determined by preparation conditions such as acid type and concentration, and heat-treatment temperature. The electrochemical intercalation of lithium into these oxides was attempted using them as the positive electrode materials for secondary lithium batteries. The results show reversible lithium intercalation and electrochemical performance that greatly depends on the oxide structure and composition.