超级电容器
材料科学
电容
电极
电化学
消灭
功率密度
多普勒展宽
分析化学(期刊)
六角相
相(物质)
正电子
谱线
纳米技术
化学工程
结晶学
六方晶系
物理化学
化学
电子
热力学
物理
核物理学
功率(物理)
有机化学
工程类
天文
作者
Zhong Li,Daqing Yuan,Shengyun Zhu,Ping Fan,Hai-Liang Ma,Qiaoli Zhang,Ali Wen,Jiliang Zhu
摘要
Fluffy spherical structure NiCo2S4 decorated with cubic phase hexagonal nanosheets was successfully synthesized through a two-step solvothermal method for energy storage. The electrochemical measurements reveal its good reversibility together with its high rate ability (1354 F g−1 at 0.5 A g−1 and 1128 F g−1 at 10 A g−1). Positron annihilation techniques (positron annihilation lifetime spectra and Doppler broadening spectra) were conducted to investigate the defects and the electronic structure of the two-step synthesized NiCo2S4. The results showed high S/W ratio, which is consistent with the electrochemical results. An asymmetric supercapacitor (ASC) was assembled in a button cell using the two-step synthesized NiCo2S4 as the positive electrode material and commercially activated carbon as the negative electrode material. The ASC presents a high energy density of 30.8 W kg−1 at a power density of 352.2 W kg−1 and 15.5 W kg−1 at a power density of 6860 W kg−1, with excellent cycling stability (89.3% capacitance retention after 3000 cycles) and nearly 100% Coulombic efficiency.
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