Abstract
Transition metal sulfides are easy to agglomerate and suffer irreversible damage due to lattice distortion caused by phase transformation, which affects the structural stability of electrode materials. In order to solve the inherent defects, cobalt-copolymer precursor was successfully synthesized, and then Co9S8/CHS superstructure are prepared by in-situ carbonization method. It exhibits a hydrangea-like structure, which is composed of numerous ultrathin nanosheets. The Co9S8/CHS material shows different voltage windows as a working electrode, which can be used as both positive and negative electrodes. A symmetric supercapacitor was assembled with Co9S8/CHS electrodes, which can deliver a high energy density of 15 Wh kg−1 at 197.08 W kg−1. When the power density increases to 800.14 W kg−1, the energy density still reaches 12.38 Wh kg−1. Additionally, the specific capacitance can still maintained at 113.02 F g−1 after 2000 cycles at the current density of 1 A g−1, the capacitance retention is up to 90% relative to the initial capacitance.
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