Abstract
The electrochemical profile of oxygen-deficient in both aqueous and nonaqueous electrolyte was extensively investigated. exhibited better cyclic capability in 0.5 M aqueous electrolyte than nonaqueous electrolyte. The cycling stability in the aqueous electrolyte is critically dependent on the pH value and charge cutoff potential. The difference in cycling stability between various electrolytes was demonstrated to be due to the oxidation of Mn on the surface of electrode by active oxygen atoms. X-ray photoelectron spectroscopy demonstrated that the Mn oxidation state of after cycling in aqueous electrolyte increased from 3.44 to 3.64. The amounts of oxygen atoms generated on the surface of electrode were estimated from the graphical representation of the Tafel plots.
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