All-solid-state flexible asymmetric supercapacitors with high energy and power densities based on NiCo2S4@MnS and active carbon

• 来源期刊: 能源化学
• 年，卷（期）: 2017,（6）
• 页码范围: 1260-1266
• 页数: 7页
• 语种: 英文

摘要

Electrode material based on a novel core-shell structure consisting of NiCo2S4 (NCS) solid fiber core and MnS (MS) sheet shell (NCS@MS) in situ grown on carbon cloth (CC) has been successfully prepared by a simple sulfurization-assisted hydrothermal method for high performance supercapacitor.The synthesized NiCo2S4@MnS/CC electrode shows high capacitance of 1908.3 F g-1 at a current density of 0.5 A g-1 which is higher than those of NiCo2S4 and MnS at the same current density.A flexible all-solid-state asymmetric supercapacitor (ASC) is constructed by using NiCo2S4@MnS/CC as positive electrode,active carbon/CC as negative electrode and KOH/poly (vinyl alcohol) (PVA) as electrolyte.The optimized ASC shows a maximum energy density of 23.3 Wh kg-1 at 1 A g-1,a maximum power density of about 7.5 kw kg-1 at 10 A g-1 and remarkable cycling stability.After 9000 cycles,the ASC still exhibited 67.8％ retention rate and largely unchanged charge/discharge curves.The excellent electrochemical properties are resulted from the novel core-shell structure of the NiCo2S4@MnS/CC electrode,which possesses both high surface area for Faraday redox reaction and superior kinetics of charge transport.The NiCo2S4@MnS/CC electrode shows a promising potential for energy storage applications in the future.