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Issue 8, 2013
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A new LiCoPO4 polymorph via low temperature synthesis

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Abstract

Non-olivine LiCoPO4 microcrystals have been synthesized at low temperatures by microwave-assisted hydrothermal synthesis. The resulting octahedra-like micrometer-sized crystals exhibit a Pn21a symmetry and are isostructural to LiZnPO4. The orthorhombic lattice constants are a = 10.023(8) Å, b = 6.724(7) Å, and c = 4.963(4) Å. The microcrystals are metastable and transform to olivine LiCoPO4 upon heating above T ≈ 220 °C under an argon atmosphere. The magnetic properties confirm a phase pure material with a Co-valence of 2+, and imply long-range antiferromagnetic ordering below TN = 11 K. Electrochemical analysis by means of cyclic voltammetry displays a reversible redox couple at around 5.1 V/4.8 V vs. Li/Li+.

Graphical abstract: A new LiCoPO4 polymorph via low temperature synthesis

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Article information


Submitted
29 Aug 2012
Accepted
02 Jan 2013
First published
04 Jan 2013

J. Mater. Chem. A, 2013,1, 2856-2862
Article type
Paper

A new LiCoPO4 polymorph via low temperature synthesis

C. Jähne, C. Neef, C. Koo, H. Meyer and R. Klingeler, J. Mater. Chem. A, 2013, 1, 2856
DOI: 10.1039/C2TA00118G

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