Gamma-LiV2O5 may represent an inexpensive and safe cathode alternate to LiFePO4 for large format Li-ion applications. Preliminary analysis suggests that this active material should cost less than $20/kg to mass produce.
Further information may be found here:
Perfomance Evaluation of LiV2O5 - J. Barker et al. (2003)
In summary, the electrochemical evaluation of Gamma-LiV2O5 indicates that the active material is capable of cycling at a specific capacity of 130 mAh/g - a performance that compares favorably with the theoretical figure of 142 mAh/g. This material utilization corresponds to the reversible cycling of x = 0.92 in Gamma-LixV2O5 – a remarkably high charge efficiency. The average discharge voltage is around 3.4 V vs Li. High-resolution electrochemical evaluation indicates the lithium insertion reactions may be characterized in two separate but highly reversible processes.
The long-term electrochemical stability of the active material has been demonstrated clearly by lifetime cycling experiments in a graphite based Li-ion configuration. The cells show low first cycle charge inefficiency as well as demonstrating two hundred charge-discharge cycles with relatively low capacity fade behavior.
Jerry
