Toward a reversible Mn⁴⁺/Mn²⁺ redox reaction and dendrite-free Zn anode in near-neutral aqueous Zn/MnO₂ batteries via salt anion chemistry
Date
2020
Authors
Zeng, X.
Liu, J.
Mao, J.
Hao, J.
Wang, Z.
Zhou, S.
Ling, C.D.
Guo, Z.
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Advisors
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Journal article
Citation
Advanced Energy Materials, 2020; 10(32):1904163-1-1904163-9
Statement of Responsibility
Xiaohui Zeng, Jiatu Liu, Jianfeng Mao, Junnan Hao, Zhijie Wang, Si Zhou, Chris D. Ling, and Zaiping Guo
Conference Name
Abstract
Rechargeable aqueous Zn/MnO₂ batteries are very attractive large-scale energy storage technologies, but still suffer from limited cycle life and low capacity. Here the novel adoption of a near-neutral acetate-based electrolyte (pH ≈ 6) is presented to promote the two-electron Mn⁴⁺/Mn²⁺ redox reaction and simultaneously enable a stable Zn anode. The acetate anion triggers a highly reversible MnO₂/Mn²⁺ reaction, which ensures high capacity and avoids the issue of structural collapse of MnO₂. Meanwhile, the anode-friendly electrolyte enables a dendrite-free Zn anode with outstanding stability and high plating/stripping Coulombic efficiency (99.8%). Hence, a high capacity of 556 mA h g⁻¹, a lifetime of 4000 cycles without decay, and excellent rate capability up to 70 mA cm⁻² are demonstated in this new near-neutral aqueous Zn/MnO2 battery by simply manipulating the salt anion in the electrolyte. The acetate anion not only modifies the surface properties of MnO₂ cathode but also creates a highly compatible environment for the Zn anode. This work provides a new opportunity for developing high-performance Zn/MnO₂ and other aqueous batteries based on the salt anion chemistry.
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© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim