期刊
ELECTROCHIMICA ACTA
卷 390, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138852
关键词
Energy storage; Aqueous rechargeable battery; Manganese dioxide-zinc; Charge-storage mechanism; Manganese-zinc hydroxide sulfate; Zinc layered double hydroxide
The novel Mn-Zn layered double hydroxide (MnZnLDH) discovered exhibits significant implications in the electrochemical activity, structure, and formation mechanism of the positive electrode in the MnO2/ZnSO4/Zn battery.
At present there is no consensus on the charge-storage mechanism of the positive electrode in the chemistry of the MnO2/ZnSO4/Zn battery. We report the discovery of a novel, electrochemically active Mn-Zn layered double hydroxide (MnZnLDH), which, is analogous in structure to ZnLDH, and because of this similarity cannot be identified as a discharge product even by the operando XRD techniques used. We were able to synthesize MnZnLDH, for the first time, and, herein, demonstrate that its electrochemical behavior, structure, and Gibbs free energy of formation correspond to the products formed during the first discharge, providing clear evidence that this phase forms during the first discharge reaction through a conversion reaction of MnO2 and Zn2+. (C) 2021 Elsevier Ltd. All rights reserved.
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