POTASSIUM VANADATES - PROMISING MATERIALS FOR SECONDARY LITHIUM BATTERIES

The electrochemical performance of the phases K3V5O14, KV3O8, K2V8O21 and KV5O13, in view of their use as positive electrodes for secondary lithium cells, has been investigated. While the two potassium richer c ompounds showed very low recharge efficiency, a good reversibility and high capacity performance have been observed for the K2V8O2, and KV5O 13 compounds. The remarkable specific capacity of KV5O13, which is abo ut 210 mA h g-1 at 2 h discharge rate, and its excellent cycleability proves it as a promising alternative for a positive electrode of secon dary lithium batteries.