An Ultrahigh Performance Alkaline Cfx-Zn Primary Battery

Abstract

With the increasing demand of high energy and power density for energy storage devices, aqueous zinc-based battery with high safety and low-cost battery system, has attracted wide attention due to its inherent advantages. Herein, for the first time, fluorinated carbon (CF0.95) materials were reported as cathodes for alkaline zinc batteries and exhibit unprecedented power and energy density. The results show that the material exhibits a very high specific capacitiy of 703.5 mAh/g as well as an ultrahigh energy density up to795.5 Wh/kg at a current rate of 50 mA/g (0.071 C). Besides, it still holds high capacity of 416.7 mAh/g when discharged at rate of 50000 mA/g (71 C), indicating an outstanding power performance of 25066.0 W/kg. The corresponding capacity can even reach to 170.6 mAh/g, 706 mAh/g and 562.6 mAh/g when it was evaluated at current rate 0.71 C under -20 ℃, 0 ℃ and 50 °C respectively. Finally, electrochemical discharge mechanism based on the conversion reaction were also further uncovered by XRD and SEM characterization and EDS elemental analysis. In conclusion, the alkaline Zn/CFx new-type primary battery systems with excellent properties developed here might show broad application prospects.

Keywords: CFx materials, cathode materials, alkaline zinc batteries, primary batteries