Layered Na 0.808 MnO 2- δ were prepared by solid state method under oxygen environment. The Rietveld refinement result showed that lattice parameters are a = 2.8653 Å, c = 11.0987 Å 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 Na1(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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Lin et al. (2019) studied this question.
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