Hierarchical NiCo-layered double hydroxide nanoscroll@PANI nanocomposite for high performance battery-type supercapacitor

In this paper, a facile strategy is developed to fabricate hierarchical NiCo layered double hydroxide (NiCo-LDH) and polyaniline (PANI) composite. A PANI nanolayer firstly uniformly covers the surface of carbon cloth (CC) by electrodeposition , followed by the growth of NiCo-LDH nanoscrolls via a hydrothermal process. The introduction of the PANI nanolayer plays a critical role in realizing the growth of NiCo-LDH nanoscroll, which possesses huge specific surface area and better electrochemical performance. The NiCo-LDH@PANI@CC nanocomposite delivers an excellent specific capacitance of 1835 F g −1 (901C g −1 ) at 1 A g −1 , outstanding rate capability with a capacitance retention of 81% from 1 A g −1 to 10 A g −1 and good cycling ability with a capacitance retention of 78% after 3000 cycles. In addition, the asymmetric supercapacitor assembled by the NiCo-LDH@PANI@CC and active carbon supplies a good energy density of 26.5 Wh kg −1 at a power density of 728.2 W kg −1 and excellent cycling stability with a capacitance retention of 78% after 5000 cycles.