Stable Manganese‐Oxide Composites as Cathodes for Zn‐Ion Batteries: Interface Activation from In Situ Layer Electrochemical Deposition under 2 V

2022 ◽  
pp. 2101924
Author(s):  
Inmaculada Álvarez‐Serrano ◽  
Paloma Almodóvar ◽  
David Agustín Giraldo ◽  
Francisco Llopis ◽  
Benjamín Solsona ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Electrochemical Deposition ◽  
Oxide Composites

scholarly journals The Role of Al3+-Based Aqueous Electrolytes in the Charge Storage Mechanism of MnOx Cathodes

2020 ◽  
Author(s):  
Véronique Balland ◽  
Mickaël Mateos ◽  
Kenneth D. Harris ◽  
Benoit Limoges
Keyword(s):  
Manganese Oxide ◽  
Critical Analysis ◽  
Charge Storage ◽  
Aqueous Electrolytes ◽  
Storage Mechanism ◽  
Main Charge ◽  
Charge Storage Mechanism ◽  
The Subject

<p>Rechargeable aqueous aluminium batteries are the subject of growing interest, but the charge storage mechanisms at manganese oxide-based cathodes remain poorly understood with as many mechanisms as studies. Here, we use an original <i>in situ</i> spectroelectrochemical methodology to unambiguously demonstrate that the reversible proton-coupled MnO<sub>2</sub>-to-Mn<sup>2+</sup> conversion is the main charge storage mechanism occurring at MnO<sub>2</sub> cathodes over a range of slightly acidic Al<sup>3+</sup>-based aqueous electrolytes. In Zn/MnO<sub>2</sub> assemblies, this mechanism is associated with high gravimetric capacity and discharge potentials, up to 560 mAh·g<sup>-1</sup> and 1.76 V respectively, attractive efficiencies (<i>CE</i> > 98.5 % and <i>EE</i> > 80%) and excellent cyclability (> 750 cycles at 10 A·g<sup>-1</sup>). Finally, we conducted a critical analysis of the data previously published on MnO<sub>x</sub> cathodes in Al<sup>3+</sup>-based aqueous electrolytes to conclude on a universal charge storage mechanism, <i>i.e.</i>, the reversible electrodissolution/electrodeposition of MnO<sub>2</sub>.<i></i></p>

A study of the discharge process of manganese oxide in borate solution using in situ techniques

1993 ◽  
Vol 38 (2-3) ◽  
pp. 341-347 ◽  
Author(s):  
B.A. Lopez De Mishima ◽  
Toshiaki Ohtsuka ◽  
Norio Sato
Keyword(s):  
Manganese Oxide ◽  
Discharge Process ◽  
In Situ Techniques ◽  
Borate Solution
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