Hydrothermal Synthesis of Special Cubic Form MnO2 and MnCO3 Composite Material for Zinc Ion Battery and its Electrochemical Performance Test

In this paper, the aqueous zinc ion battery cathode material composed of manganese dioxide and manganese carbonate were synthesized by hydrothermal method. By optimizing the temperature and time in both hydrothermal and calcination process, the optimal synthesis conditions were discovered. Then, in order to survey and analysis the characteristics of the material, XRD, SEM, EDS and XPS tests were conducted. It can be seen from XRD test that the main crystal structure is MnO 2 and MnCO 3 , and no other obvious impurity peaks are found. In the SEM test, it can be seen that the main shape of the material is regular cube, and there is triangular pyramidal bulge on the surface of the cube, which can increase the surface area of the material. As can be seen from EDS and element distribution diagram, Mn, O and C elements are evenly distributed. The XPS test shows that the valence states of the synthesized materials are consistent with those of MnO 2 and MnCO 3 . According to the infrared test and Raman test, the characteristic peak vibration of the synthesized material is also consistent with those of MnO 2 and MnCO 3 , indicating that the composite of MnO 2 and MnCO 3 with high electrochemical stability has been synthesized by hydrothermal method.