Jahn–Teller Distortion Induced Mn2+-Rich Cathode Enables Optimal Flexible Aqueous High-Voltage Zn-Mn Batteries
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2021-06-23
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en
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10
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Advanced Science, Volume 8, issue 12
Abstract
Although one of the most promising aqueous batteries, all Zn-Mn systems suffer from Zn dendrites and the low-capacity Mn4+/Mn3+ process (readily leading to the occurrence of Jahn–Teller distortion, which in turn causes structural collapse and voltage/capacity fading). Here, the Mn3+ reconstruction and disproportionation are exploited to prepare the stable, Mn2+-rich manganese oxides on carbon-cloth (CMOs) in a discharged state through an inverted design, which promotes reversible Mn2+/Mn4+ kinetics and mitigates oxygen-related redox activity. Such a 1.65 V Mn2+-rich cathode enable constructing a 2.2 V Zn-Mn battery, providing a high area capacity of 4.16 mA h cm–2 (25 mA h cm–2 for 10 mL electrolyte) and superior 4000-cycle stability. Moreover, a flexible hybrid 2.7 V Zn-Mn battery is constructed using 2-pH hydrogel electrolytes to demonstrate excellent practicality and stability. A further insight has been gained to the commercial application of aqueous energy storage devices toward low-cost, high safety, and excellent energy density.Description
Funding Information: This research was supported by the National Science Foundation of China (Nos. 51932003, 51872115), 2020 International Cooperation Project of the Department of Science and Technology of Jilin Province (20200801001GH), Program for the Development of Science and Technology of Jilin Province (20190201309JC). Publisher Copyright: © 2021 The Authors. Advanced Science published by Wiley-VCH GmbH Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
Keywords
2-pH hydrogel electrolytes, Jahn–Teller distortion, Mn2+-rich cathodes, reversible Mn/Mn, Zn batteries
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Citation
Dai, L, Wang, Y, Sun, L, Ding, Y, Yao, Y, Yao, L, Drewett, N E, Zhang, W, Tang, J & Zheng, W 2021, ' Jahn–Teller Distortion Induced Mn 2+ -Rich Cathode Enables Optimal Flexible Aqueous High-Voltage Zn-Mn Batteries ', Advanced Science, vol. 8, no. 12, 2004995 . https://doi.org/10.1002/advs.202004995