Electrode material, production method of same and lithium ion secondary battery

摘要

An electrode material uses, as an active material, sodium vanadium oxide represented by Na x V 2 O 5 (0 < x < 0.33) and having a crystal phase of a stoichiometric composition of Na 0.33 V 2 O 5 or Na 1.0 V 6 O 15 . As a result, together with improving battery capacity by employing a composition in which Na is made to be deficient, satisfactory cycle characteristics can be maintained due to the presence of sodium. In addition, since an electrode material production method uses NaOH and NH 4 VO 3 as raw materials, the electrode material of the present invention can be efficiently produced with heat treatment at a comparatively low temperature.