Li ion diffusion measurements in crystalline and amorphous V_2O_5 thin-film battery cathodes

摘要

Thin films of crystalline and amorphous V_2O_5 weredeposited by pulsed laser deposition (PLD) and the chemcial diffusion coefficents. D, were measured by the potentiostatic intermittent titration technique (PITT). In crystalline V_2O_5 films, the maximum and minimum D were found to be 1.7 x 10~-12 cm~2/s and 5.8 x 10~-15 cm~2/s respectively, with a general trend for D to rise in single-phase regions. The changes in D correlated well to the known phases in Li_xV_2O-5. In amorphous V_2O_5 films, D exhibited a smooth, continuous decrease as the Li concentration increased.