Lithium insertion behavior of ε-Cu 0.9V 2O 5

Abstract

Copper vanadium oxide bronze ε-Cu 0.9V 2O 5 has been synthesized and its lithium insertion behavior has been investigated. Insertion and extraction of lithium in this bronze occur up to about 2 mol per formula unit while maintaining its layered structure. Reversible reduction of V V to V IV up to V V/V IV=1, interlayer Cu 1 to Cu 0 followed by crystallization, and further reduction of V V to V IV occur successively in the course of lithium insertion. The opposite lithium extraction processes occur reversibly with corresponding oxidation processes. This behavior is similar to that in δ-Ag y V 2O 5, with the typical double-layer structure.