Hydrothermal synthesis and electrochemistry of a delta type manganese vanadium oxide

A new manganese vanadium oxide containing double sheets of V2O5 layers has been synthesized hydrothermally in the presence of tetramethylammonium ions. It has the electrochemically active delta -V2O5 structure, variants of which are found in V6O13 and xerogel vanadium oxides. The manganese ions, together with the N(CH3)4 ions, reside in a disordered manner between the oxide sheets. The delta-type [N(CH3)4]zMnyV2O5·nH2O has a monoclinic structure, a=11.66(2) ?, b=3.610(9) ?, c=13.91(4) ?, beta=108.8(2)°. It reacts readily with lithium with a capacity exceeding 220 mAh g-1; the organic ions do not impede reaction as in the single sheet V2O5 materials, such as N(CH3)4V3O7.