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MnO2/Mn2+ chemistry...
MnO2/Mn2+ chemistry: Charging protocol and electrolyte regulation
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- Wang, Huan (författare)
- KTH,Tillämpad elektrokemi
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- Wang, Tongshuai (författare)
- KTH,Tillämpad elektrokemi
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- Stevenson, Graham (författare)
- Enerpoly AB, Teknikringen 38, Stockholm, Sweden
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- Chamoun, Mylad (författare)
- Enerpoly AB, Teknikringen 38, Stockholm, Sweden
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- Wreland Lindström, Rakel, 1973- (författare)
- KTH,Tillämpad elektrokemi
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(creator_code:org_t)
- Elsevier BV, 2023
- 2023
- Engelska.
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Ingår i: Energy Storage Materials. - : Elsevier BV. - 2405-8289 .- 2405-8297. ; 63
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- Dense and fluffy morphology
- Dissolution/deposition mechanism
- Electrochemical-deposition
- Mn disproportionation-deposition 3
- Zn-MnO battery 2
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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