He Li,Yunhui Wang,Jiali Jiang,Yiyong Zhang,Yueying Peng,Jinbao Zhao
In this work, CuS microspheres are synthesized by a facile microwave synthesis without any template or additive. As-prepared CuS microspheres display steady reversibility by adopting triethylene glycol dimethyl ether (TEGDME) as the electrolyte solvent and adjusting cut-off voltage to 0.6 − 3.0 V. The discharge capacity stands at 162 mAh g −1 after 200 cycles with the capacity retention of 95.8%. Electrochemical kinetics of CuS electrodes is investigated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and galvanostatic intermittent titration technique (GITT) tests. Beyond that, electrochemical reactions of CuS electrodes are explored using ex-situ X-ray diffraction (XRD). As far as we know, it is not only the best performance of CuS electrodes in Na-ion batteries (NIBs) but also the first time that the kinetics and reaction mechanism of CuS in NIBs are investigated.
Shixiong Zhai,Kaili Jin,Man Zhou,Zhuizhui Fan,Hong Zhao,Xiaoyan Li,Yaping Zhao,Fengyan Ge,Zaisheng Cai
In this work, a novel flexible electrode composed of porous carbonized cotton, ZnO nanoparticles and CuS micro-spheres is prepared by two-step method. Benefitting from the synergistic effect of eletrochemical double layer capacitance and pseudo capacitance, the porous carbonized cotton/ ZnO/CuS composite (pCcZC) electrode shows excellent specific capacitance (1830 mF cm −2 at 2 mA cm −2 ), high rate performance (74% retention with the current density increasing from 2 to 10 mA cm −2 ) and outstanding cycle stability (14.8% loss of initial capacitance after 5000 cycles). The flexible and lightweight carbonized cotton as current collector directly makes the electrode binder-free, flexible and wearable. Additionally, the flexible symmetrical supercapacitor based on pCcZC electrodes achieves a superior energy density of 0.27 Wh cm −2 at 4.26 W cm −2 , and can succesfully light the LED, which manifests its great applied potential in the new generation of portable and wearable energy storage devices.
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