Layered Na2V6O16 nanobelts as promising cathode and symmetric electrode for Na-ion batteries with high capacity

Layer structured Na2V6O16 nanobelts (NVON) are synthesized by a facile, effective, low cost, one-pot and template free method. Inspired by its structure advantages, the NVON are tested as cathode material for Na-ion batteries (NIBs), which show a high reversible capacity of 194.6 mAh g−1. Furthermore, the NVON can maintain its initial structure after repeated charge/discharge which could result in good cyclic stability. Most importantly, the NVON can be used to prepare symmetric NIBs electrode, which exhibit a high discharge capacity of 132.9 mAh g−1 and a higher energy density of 82 Wh kg−1. The obtained results demonstrate the promising potential of NVON as cathode materials for NIBs, which highlight the importance of nanocrystallization of layered structured for maximum utilization of electrochemically active sites in a high performance NIBs.