A simple and versatile method for preparation of novel sodium intercalated (NH4)(2)V6O16 is developed via a simple hydrothermal route. It is found that ammonium sodium vanadium bronze displays higher discharge capacity and better rate cyclic stability than ammonium vanadium bronze as lithium-ion battery cathode material because of smaller charge transfer resistance, which would favor superior discharge capacity and rate performance. Crown Copyright (C) 2013 Published by Elsevier Inc. All rights reserved.