156 / 2022-02-11 15:52:10

LDH-derived Flower-like Co-Ni fluorides as electrode material for asymmetric supercapacitors

Transition metal fluorides, Electrochemical, Supercapacitors，LDH

（7）矿物与先进能源材料 > 8. 新型能源材料

Designing and exploring electrode materials with wide potential window are of crucial significance for the future large-scale development of supercapacitors. Herein, Co-Ni fluorides were prepared by a two-step method with layered double hydroxides as a template. Benefitting from the unique hierarchical structure and synergistic effects between each component, the resultant Co-Ni fluorides displayed a spectacular specific capacitance of 1890F·g^-1 at a current density of 1A·g^-1 with an outstanding rate capability of of 62.3% at 10A·g^-1, which was highly superior to those of other Co-Ni composites. The asymmetric supercapacitor assembled with Co-Ni fluorides and activated carbon（AC）as the cathode and anode exhibited high energy density up to 37 Wh·kg^-1 at 900 W·kg^-1. Moreover, it had good cycle stability, maintaining 94% of its initial capacitance after 2000 cycles. These intriguing electrochemical performances indicate that Co-Ni fluorides has enormous potential application in high performance energy storage systems in the future.