Pseudocapacitive layered iron vanadate nanosheets cathode for ultrahigh-rate lithium ion storage

Pseudocapacitive charge storage has been regarded as a promising mechanism to achieve both high specific energy and power energy storage devices. Some pseudocapacitive anode materials show great high-rate performance, however, it remains a significant challenge to develop the cathode ones. Herein, for the first time, we report a layered iron vanadate (Fe5V15O39(OH)9⋅9H2O, named as kazakhstanite) nanosheets (FeVO NSs) with featuring ultrathin layer thickness (