Preparation And Lithium Storage Properties Of Free-Standing And Three-Dimensional Porous Cu@Sno2 Membrane Electrode

In order to solve the problem of the low load of nano active materials in traditional electrodes, the free-standing and three-dimensional porous Cu @ SnO2 (3DCu @ SnO2) membrane electrode with high loading capacity was obtained by nonsolvent induced phase separation method and reduction/sintering process to inherit the three-dimensional porous structure of polymer membrane. The morphology, structure and electrochemical properties of free-standing membrane electrodes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis and electrochemical workstations. The effects of material ratio and sintering temperature on the structure and properties of self-supporting membrane electrodes were clarified. The results show that the membrane electrode with 60% (mass fraction, the same below) copper powder sintered at 600 degrees C has three-dimensional bicontinuous porous structure with SnO2 loading up to 30%. At the current density of 100 mA . g(-1), the reversible specific capacity can reach 715 mAh . g(-1), and remains 433. 9 mAh . g(-1) after 50 cycles. The specific capacity retention rate can reach 72%, when the current density increases to 600 mA . g(-1). The resistance of the 3DCu@ SnO2 membrane electrode is 70% lower than that of traditional coating electrode.