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202001_NNMO_OR_ChemRxiv.pdf (1007.38 kB)

Negligible Voltage Hysteresis with Strong Anionic Redox in Conventional Battery Electrode

preprint
submitted on 31.01.2020, 09:11 and posted on 31.01.2020, 10:59 by Kehua Dai, Jing Mao, Zengqing Zhuo, Guo Ai, Wenfeng Mao, Yan Feng, Feng Pan, Yi-de Chuang, Gao Liu, Wanli Yang
Lattice oxygen redox reactions (ORR) offers opportunities for developing highcapacity batteries, however, suffers the notoriously high voltage hysteresis and low initial coulombic efficiency, which hinder its practical applications. Particularly, ORR was widely considered inherent to these kinetic issues. In this paper, unambiguous evidence of strong and reversible ORR is found in Na2/3Ni1/3Mn2/3O2, which displays negligible voltage hysteresis (0.1 V) and high initial coulombic efficiency with a highly stable electrochemical profile. Our independent and quantitative analysis of all the Ni, Mn and O states consistently interpret the redox mechanism of Na2/3Ni1/3Mn2/3O2, which reveals, for the first time, a conventional 3d transition-metal ORR system with facile kinetics and highly stable electrochemical profile that previously found only in cationic redox systems.

Funding

DOE BES office of facility DE-AC02-05CH11231

EERE BMR DE-AC02-05CH11231

NNSFC 51604244

History

Email Address of Submitting Author

wlyang@lbl.gov

Institution

Lawrence Berkeley National Laboratory

Country

United States

ORCID For Submitting Author

0000-0003-0666-8063

Declaration of Conflict of Interest

None

Exports

ChemRxiv

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