Journal
MATERIALS RESEARCH EXPRESS
Volume 6, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/ab2e4e
Keywords
Na-ion batteries; Na0.808MnO2-delta; electrochemical properties; defect structure
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Funding
- NSFC through NSFC Committee of China [11604056]
- NSFGP through guangdong province science foundation [2018A030313272]
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Layered Na0.808MnO2-delta were prepared by solid state method under oxygen environment. The Rietveld refinement result showed that lattice parameters are a = 2.8653 angstrom, c = 11.0987 angstrom with space group P63/mmc. There were some vacancies in Na site and O site, and the Na vacancy is more easily formed in the Nal(2b) site by first-principles calculation. The electrochemical measurement shows reversible de/intercalation of about 0.4Na ion so as to deliver a discharge capacity of 103 mAhg(-1) in the potential range of 2.0-3.6 V. By comparison of theory and experiment, some Na vacancies is favor to improving the cycle performance of sodium ion battery.
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