LITHIUM INTERCALATION IN NA1+XV3O8 SYNTHESIZED BY A SOLUTION TECHNIQUE

Na1+xV3O8 has been synthesized with a simple precipitation technique. Its performance as a cathode for rechargeable Li cells is far superior to that of the analogous material perpared at high temperature in terms of specific capacity and rate capability. As a result of the possibility of intercalating about 4.5 Li+ mol-1, low temperature Na1+xV3O8 has a theoretical energy density of 900 Wh kg-1. The diffusion coefficients, measured by impedance spectroscopy, have values of 10(-8)-10(-9) cm2 s-1, this matching the fast kinetics observed. A comparison is made of the performance of this new material with that of Li1+xV3O8 prepared with the same technique.