L773:2405 8297
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MnO2/Mn2+ chemistry: Charging protocol and electrolyte regulation
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- Wang, Huan (author)
- KTH,Tillämpad elektrokemi
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- Wang, Tongshuai (author)
- KTH,Tillämpad elektrokemi
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- Stevenson, Graham (author)
- Enerpoly AB, Teknikringen 38, Stockholm, Sweden
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- (creator_code:org_t)
- Elsevier BV, 2023
- 2023
- English.
- In: Energy Storage Materials. - : Elsevier BV. - 2405-8289 .- 2405-8297. ; 63
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Aqueous rechargeable Zn-MnO2 batteries based on the dissolution/deposition mechanism of MnO2/Mn2+are gaining increasing attention due to their high capacity and structural simplicity. One of the major concerns is the Mn2+/Mn3+side reaction, which hampers the coulombic efficiency (CE) due to Mn3+(aq) disproportionation. However, factors affecting Mn3+ formation have not been systematically investigated. In this study, we utilized in situ optical microscopy and Scanning Electron Microscopy (SEM) to evaluate the formation of Mn3+ by observing its disproportionation product: the randomly deposited MnO2. We found that an excessively high charging voltage and a low electrolyte pH (pH<4.2) were shown to adversely accelerate Mn3+ formation. Most reports on the Mn2+/MnO2 cathode indicate a coulombic efficiency of only 80 % on carbon felt (thickness: 2.5 mm) at 2 mAh/cm2 due to the inherently low electrical conductivity of MnO2. Here with the optimized charging protocol and the utilization of the anode-friendly, methanesulfonic acid (MSA)-containing electrolyte, we achieved a CE of nearly 100 % for up to 200 cycles at 2 mAh/cm2. This work gives guidelines on the electrolyte design and charging protocol optimization towards high-performance MnO2/Mn2+cathodes.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- Dense and fluffy morphology
- Dissolution/deposition mechanism
- Electrochemical-deposition
- Mn disproportionation-deposition 3
- Zn-MnO battery 2
Publication and Content Type
- ref (subject category)
- art (subject category)
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- NATURAL SCIENCES
- NATURAL SCIENCES
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- Royal Institute of Technology
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