Crystal chemistry of the Pmnb polymorph of Li2MnSiO4

Gummow, R.J., Sharma, N., Peterson, V.K., and He, Y. (2012) Crystal chemistry of the Pmnb polymorph of Li2MnSiO4. Journal of Solid State Chemistry, 188. pp. 32-37.

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The crystal structure of the Pmnb polymorph of Li2MnSiO4 (prepared by solid-state synthesis in argon at 900 °C) is characterized by Rietveld refinement of structural models using high resolution synchrotron X-ray and neutron powder diffraction data. The crystal structure is confirmed to be isostructural with Li2CdSiO4 with lattice parameters a=6.30694(3), b=10.75355(4), and c=5.00863(2) Å, which are in good agreement with previously published data. No evidence was found for mixed lithium/manganese sites. Testing of the material as a cathode in a lithium cell shows that 1.3 lithium ions per formula unit can be extracted on the first charge cycle but very little lithium can be re-inserted. These results are compared with those of other phase-pure Li2MnSiO4 polymorphs.

Item ID: 19659
Item Type: Article (Research - C1)
ISSN: 1095-726X
Date Deposited: 17 Apr 2012 06:24
FoR Codes: 03 CHEMICAL SCIENCES > 0306 Physical Chemistry (incl Structural) > 030606 Structural Chemistry and Spectroscopy @ 40%
09 ENGINEERING > 0912 Materials Engineering > 091205 Functional Materials @ 60%
SEO Codes: 85 ENERGY > 8506 Energy Storage, Distribution and Supply > 850602 Energy Storage (excl. Hydrogen) @ 100%
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