Role of dissolution of Mn(iii) species in discharge and recharge of chemically-modified MnO2 battery cathode materials

Qu, Deyang; Conway, B. E.; Bai, L.; Zhou, Yuanliang; Adams, William A.

doi:10.1007/bf00243339

Cited by 54 publications

(54 citation statements)

References 19 publications

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“…38 Formation of the insulating Mn(OH)2 occurs because the solubility of MnOOH becomes significant in concentrated alkaline solutions. 39,40 The dissolved Mn(III) species in turn undergo a reduction process to form Mn(II) species at low voltages and eventually into insoluble Mn(OH)2 by combining Please do not adjust margins Please do not adjust margins with OH − ions. 38 In this case, the neutral aqueous electrolytes, such as Li2SO4, Na2SO4, K2SO4, and KCl solutions, are widely used in the MnO2 based supercapacitor and electrode materials studies.…”

Section: Aqueous Supercapacitors and Supercapatteriesmentioning

confidence: 99%

Electrolytes for electrochemical energy storage

Xia

et al. 2017

Mater. Chem. Front.

233

116

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk Journal NameThis journal is © The Royal Society of Chemistry 20xxJ. Name., 2013, 00, 1-3 | 1 Electrolyte is a key component of electrochemical energy storage (EES) devices and its properties greatly affect the energy capacity, rate performance, cyclability and safety of all EES devices. This article offers a critical review of recent progresses and challenges in electrolyte research and development particularly for supercapacitors and supercapatteries, recharegable batteries (such as lithium-ion and sodium-ion batteries), and redox flow batteries (including fuel cells in a broad sense). The review will focus on liquid electrolytes, particularly aqueous and organic electrolytes, ionic liquids and molten salts. Influences of electrolyte properties on the performances of different EES devices are discussed in detail.

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Section: Aqueous Supercapacitors and Supercapatteriesmentioning

confidence: 99%

Electrolytes for electrochemical energy storage

Xia

et al. 2017

Mater. Chem. Front.

233

116

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“…1; it corresponds to the ␣-modification. The beneficial effect of Bi 2 O 3 on the MnO 2 component has been well documented in the literature [24][25][26]. The effect of Bi 2 O 3 on the performance of the nickel hydroxide electrode has not, however, been investigated.…”

Section: Resultsmentioning

confidence: 99%

Nickel oxyhydroxide/manganese dioxide composite as a candidate electrode material for alkaline secondary cells

Ramesh¹,

Kamath²

2008

Journal of Power Sources

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Nickel hydroxide and manganese dioxide are used in alkaline cells as positive electrode materials. Positive electrodes comprising a nickel oxyhydroxide/manganese dioxide composite, with modification by Bi 2 O 3 , deliver a combined reversible discharge capacity of 2.25e per metal atom (650 mAh g −1 metal content), which is higher than that realized from electrodes of either component taken singly. The composite discharges with two potential plateaux, the first appearing at 325 mV corresponds to the discharge of the nickel component, whereas the second at −600 mV is due to the manganese component. Composites of NiO(OH)/MnO 2 can be used as a new electrode material with higher discharge capacity than conventional electrodes.

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“…Potassium permanganate (Sigma-Aldrich), barium chloride dihydrate (Sigma-Aldrich), and acetylene black (Fisher Scientific) were used as precursors. KMnO 4 and BaCl 2 *2H 2 O were added to 400 mL of H2O in a round-bottomed flask to form a 0.1 M solution each of KMnO 4 and BaCl 2 . 2 g of carbon black were added.…”

Section: Methodsmentioning

confidence: 99%

“…2 During discharge reactions involving more than 0.5 e − /Mn, γ-MnO 2 can transform into birnessite, a manganese dioxide phase which has very low ionic conductivity. 3,4 Local potential gradients can trigger this transformation at electrode averaged depths of discharge as low as 20%, depending on the construction of the electrode, causing the formation of small amounts of electrochemically inactive phases. Even these small inactive particles can lead to uneven potential distributions throughout the cell, accelerating the eventual failure of the battery.…”

mentioning

confidence: 99%

A Manganese-Doped Barium Carbonate Cathode for Alkaline Batteries

Hertzberg

Sviridov

Stach

et al. 2014

J. Electrochem. Soc.

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MnO2-Zn alkaline batteries are one of the most common modern forms of primary battery, due to their relatively high energy density and low cost per kilowatt-hour. Additionally, unlike many other types of primary battery, alkaline cells can theoretically be recharged. Their low cost per kilowatt-hour makes them potentially ideal for applications such as sustainable energy storage or peak demand shaving. However, a phase transformation that occurs in MnO2 after reduction by more than one electron converts it into the electrochemically inactive Mn3O4 phase. This limits the total depth of discharge of the cell significantly. We report the synthesis of a novel electrode material, manganese-doped witherite, for rechargeable alkaline batteries produced by a simple hydrothermal process. The material has been studied via X-ray diffraction and electroanalytical techniques. We show that unaltered witherite has poor electrochemical properties, and that this new material has high capacity and rate capability, even under deep discharge conditions, superior to conventional manganese dioxide.

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Role of dissolution of Mn(iii) species in discharge and recharge of chemically-modified MnO2 battery cathode materials

Cited by 54 publications

References 19 publications

Electrolytes for electrochemical energy storage

Electrolytes for electrochemical energy storage

Nickel oxyhydroxide/manganese dioxide composite as a candidate electrode material for alkaline secondary cells

A Manganese-Doped Barium Carbonate Cathode for Alkaline Batteries

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