Bivalence Mn5O8 with hydroxylated interphase for high-voltage aqueous sodium-ion storage

Xiaoqiang Shan, Daniel S. Charles, Yinkai Lei, Ruimin Qiao, Guofeng Wang, Wanli Yang, Mikhail Feygenson, Dong Su and Xiaowei Teng ()
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Xiaoqiang Shan: University of New Hampshire
Daniel S. Charles: University of New Hampshire
Yinkai Lei: University of Pittsburgh
Ruimin Qiao: Advanced Light Source, Lawrence Berkeley National Laboratory
Guofeng Wang: University of Pittsburgh
Wanli Yang: Advanced Light Source, Lawrence Berkeley National Laboratory
Mikhail Feygenson: Spallation Neutron Source, Oak Ridge National Laboratory
Dong Su: Center for Functional Nanomaterials, Brookhaven National Laboratory
Xiaowei Teng: University of New Hampshire

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Aqueous electrochemical energy storage devices have attracted significant attention owing to their high safety, low cost and environmental friendliness. However, their applications have been limited by a narrow potential window (∼1.23 V), beyond which the hydrogen and oxygen evolution reactions occur. Here we report the formation of layered Mn5O8 pseudocapacitor electrode material with a well-ordered hydroxylated interphase. A symmetric full cell using such electrodes demonstrates a stable potential window of 3.0 V in an aqueous electrolyte, as well as high energy and power performance, nearly 100% coulombic efficiency and 85% energy efficiency after 25,000 charge–discharge cycles. The interplay between hydroxylated interphase on the surface and the unique bivalence structure of Mn5O8 suppresses the gas evolution reactions, offers a two-electron charge transfer via Mn2+/Mn4+ redox couple, and provides facile pathway for Na-ion transport via intra-/inter-layer defects of Mn5O8.

Date: 2016
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DOI: 10.1038/ncomms13370

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