MnO2/MnO cathode material with superior Zn^2+storage performance is prepared through a simple physical mixing method.The MnO2/MnO nanocomposite with a mixed mass ratio of 12:1 exhibits the highest specific capacity(36...MnO2/MnO cathode material with superior Zn^2+storage performance is prepared through a simple physical mixing method.The MnO2/MnO nanocomposite with a mixed mass ratio of 12:1 exhibits the highest specific capacity(364.2 mA·h/g at 0.2C),good cycle performance(170.4 mA·h/g after 100 cycles)and excellent rate performance(205.7 mA·h/g at 2C).Analysis of cyclic voltammetry(CV)data at various scan rates shows that both diffusioncontrolled insertion behavior and surface capacitive behavior contribute to the Zn2+storage performance of MnO2/MnO cathodes.And the capacitive behavior contributes more at high discharge rates,due to the short paths of ion diffusion and the rapid transfer of electrons.展开更多
Layered solid solution material Lil.2Nio.2Mn0.602 is synthesized and the A1F3 is added to improve the electrochemical performance. X-ray diffraction （XRD） results show that the Lil.2Nio.2Mno.602 samples exhibit laye...Layered solid solution material Lil.2Nio.2Mn0.602 is synthesized and the A1F3 is added to improve the electrochemical performance. X-ray diffraction （XRD） results show that the Lil.2Nio.2Mno.602 samples exhibit layered characteristics. The A1F3 additive is detected by transmission electron microscope （TEM） technology. The electrochemical tests show that Lil.2Nio.2Mno.602 electrode with A1F3 added delivers better discharge capacity （240mA.h/g）, first coulomb efficiency 79.2%, cyclic performance （capacity retention ratio of 100.6% after 50 cycles）, and rate capacity （68 mA. h/g at 10 capacity （C）） than the pristine sample. Electrochemical impedance spectroscopy （EIS） results show that the charge transfer resistance of Lil.2Ni0.2Mno.602 electrode with A1F3 added increases slower than that of pristine Lil.2Ni0.2Mno.602 after cycling, which is responsible for better cyclic and rate performance.展开更多
基金Project(21905304)supported by the National Natural Science Foundation of ChinaProject(ZR2019BEM031)supported by the Natural Science Foundation of Shandong Province,ChinaProjects(18CX02158A,19CX05001A)supported by the Fundamental Research Funds for the Central Universities,China。
文摘MnO2/MnO cathode material with superior Zn^2+storage performance is prepared through a simple physical mixing method.The MnO2/MnO nanocomposite with a mixed mass ratio of 12:1 exhibits the highest specific capacity(364.2 mA·h/g at 0.2C),good cycle performance(170.4 mA·h/g after 100 cycles)and excellent rate performance(205.7 mA·h/g at 2C).Analysis of cyclic voltammetry(CV)data at various scan rates shows that both diffusioncontrolled insertion behavior and surface capacitive behavior contribute to the Zn2+storage performance of MnO2/MnO cathodes.And the capacitive behavior contributes more at high discharge rates,due to the short paths of ion diffusion and the rapid transfer of electrons.
基金the Postdoctoral Foundation of China (No.2012M511211)the Postdoctoral Foundation of Jiangsu Province(No.1102121C)
文摘Layered solid solution material Lil.2Nio.2Mn0.602 is synthesized and the A1F3 is added to improve the electrochemical performance. X-ray diffraction （XRD） results show that the Lil.2Nio.2Mno.602 samples exhibit layered characteristics. The A1F3 additive is detected by transmission electron microscope （TEM） technology. The electrochemical tests show that Lil.2Nio.2Mno.602 electrode with A1F3 added delivers better discharge capacity （240mA.h/g）, first coulomb efficiency 79.2%, cyclic performance （capacity retention ratio of 100.6% after 50 cycles）, and rate capacity （68 mA. h/g at 10 capacity （C）） than the pristine sample. Electrochemical impedance spectroscopy （EIS） results show that the charge transfer resistance of Lil.2Ni0.2Mno.602 electrode with A1F3 added increases slower than that of pristine Lil.2Ni0.2Mno.602 after cycling, which is responsible for better cyclic and rate performance.
