Abstract:
Rechargeable aqueous zinc-ion battery (ZIB) is considered one of the attractive energy storage devices due to safety and cost-effective features. However, a few cathode materials have been studied for achieving high-capacity and cyclability of ZIB. Thus, the cathode materials available still need to be further explored. Herein, we firstly report tungsten oxide as cathode material for ZIB. The tungsten oxide cathode exhibits extraordinary rate performance (158 mA h g-1 under 0.1A g-1), remarkable cycling performance (96% over 1000 cycles) and remarkable energy density (102Wh kg-1 at 116 W kg-1). Additionally, an electrochemical mechanism based on reversible Zn2+ insertion/extraction in cathode structure is firstly demonstrated, and the impressive flexibility and excellent capabilities of the soft-packaged batteries are also realized. Therefore, this research will pave a novel consideration of tungsten oxide in designing cathodes of ZIBs with high electrochemical performance.