The structure of the material was analysed using TEM, XRD, Raman spectroscopy, IR spectroscopy, XPS and thermogravimetric analysis (TG), and the electrochemical properties of the materials were tested using the LAND and CHI 660e electrochemical workstations. The TEM is the original photographs, which were only marked with a ruler after cropping. The rest of the data were plotted using Origin software.