| Autor: |
Siamionau, U. V., Aniskevich, Y. M., Ragoisha, G. A., Streltsov, E. A. |
| Předmět: |
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| Zdroj: |
Journal of Solid State Electrochemistry; Jul2023, Vol. 27 Issue 7, p1911-1918, 8p |
| Abstrakt: |
Effects of MnO2 electrodeposition on α, β, γ, and δ-MnO2 polymorphs from aqueous zinc sulfate solution with manganese sulfate additive (zinc-ion battery (ZIB) electrolyte) have been examined by cyclic voltammetry, electrochemical impedance spectroscopy, X-ray diffraction, and scanning electron microscopy. Even three cycles of anodic charge and cathodic discharge in the typical potential range used in zinc-ion battery research are sufficient for entire electrode surface coverage by essentially X-ray amorphous deposit with a minor contribution of γ-MnO2. The fast MnO2 deposition proceeds via Mn2+ anodic oxidation upon charge at potentials above 1.8 V (vs. Zn2+/Zn). As a consequence of the fast electrodeposition, the choice of MnO2 polymorph for the positive electrode in aqueous ZIB with Mn(II) additive in the electrolyte turns to be even less critical than in ZIB without Mn(II) additive. Though using a narrower potential range in the battery charging may help to mitigate the MnO2 electrodeposition, the cost of the mitigation would be a reduction of an enhanced capacity of Mn(II)-containing ZIB, as the latter is essentially due to MnO2 anodic deposition. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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