Issue 47, 2016

The hydrothermal synthesis, crystal structure and electrochemical properties of MnSb2O4

Abstract

Phase pure polycrystalline MnSb2O4 was synthesised under hydrothermal conditions. Impurities formed outside a narrow range of pH and metal stoichiometric ratios. The structure and its temperature dependence was studied based on multi-temperature conventional single crystal X-ray diffraction (SC-XRD) and high resolution synchrotron powder X-ray diffraction (PXRD). At low temperature (100–300 K) the lattice parameters expanded linearly with thermal expansion coefficients of αa,300 K = 8(1) × 10−6 K−1 and αc,300 K = 7.2(2) × 10−6 K−1. At high temperature an irreversible annealing effect was observed. Modelling the atomic displacement parameters based on the single crystal X-ray diffraction data gives a Debye temperature of 267(3) K for MnSb2O4. When heated in an oxygen-rich atmosphere MnSb2O4 oxidises above 800 K and it decomposes at 975 K under inert conditions. Electrochemical measurements displayed similar behaviour to the isostructural CoSb2O4, with reversible alloying–dealloying of LixSb after the first cycle with a reversible capacity of 337 mAh g−1 at the 2nd cycle, which degraded to c. 100 mAh g−1 after 30 cycles.

Graphical abstract: The hydrothermal synthesis, crystal structure and electrochemical properties of MnSb2O4

Supplementary files

Article information

Article type
Paper
Submitted
04 Sep 2016
Accepted
05 Nov 2016
First published
07 Nov 2016

Dalton Trans., 2016,45, 18994-19001

The hydrothermal synthesis, crystal structure and electrochemical properties of MnSb2O4

M. Roelsgaard, P. Nørby, E. Eikeland, M. Søndergaard and B. B. Iversen, Dalton Trans., 2016, 45, 18994 DOI: 10.1039/C6DT03459D

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