Visualizing Structural Changes in Batteries Using Hard Radiation and the GaliPIX3D Detector
contributed by Malvern Panalytical |
Computed tomography on alkaline batteries
The alkaline batteries chosen for this purpose consist of MnO2 as the cathode material Zn powder as the anode material [2-3]. While MnO2 is used as a solid mixture with graphite, the Zn powder is suspended in gelled KOH electrolyte. The main chemical processes can be described in the following way:
Zn + 2OH- > ZnO+H2O + 2e-
2MnO2 +2H2O + 2e- > 2MnOOH +2OH-
During the electric discharge MnO2 is reduced by a solid-state intercalation of H+ into the MnO2 lattice. The Zn is oxidised and ZnO is formed around the core. MnO2 is transformed to MnOOH and as a consequence the thickness of the Mn layer increases.
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