Highly reduced VOx nanotube cathode materials with ultra-high capacity for magnesium ion batteries

摘要: Here, we describe novel VOx nanotubes with vanadium at various oxidation states (V3+/V4+/V5+) as cathode materials for magnesium ion batteries. The synthesized by a microwave-assisted hydrothermal process using an amine organic template show high initial discharge capacity (∼218 mA h g−1) of more than 200 g−1 and outstanding cycling performance, which have not been previously reported These improvements in the electrochemical performance our originate from trivalent ions generated highly reduced nanotubes. exhibit lower charge transfer resistance electrode/electrolyte interfaces superior containing higher state. We first suggest that pristine state maintenance bonding structure on surface are most important factors determining insertion/extraction kinetics into/out Our findings offer breakthrough strategy achieving high-energy-density rechargeable batteries nanotube combination nanoarchitecture tailoring.