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Issue 27, 2011
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Improved kinetics and stabilities in Mg-substituted LiMnPO4

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Abstract

LiMgxMn1−xPO4 (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) crystals were prepared hydrothermally. The presence of Mg2+ was found to improve the kinetics, utilization, and physical stability of the crystals during chemical and electrochemical delithiation, as well as the thermal stability of the delithiated phase. The best performance was found in the sample with 20% substitution. The positive effect of Mg2+ was attributed to the reduced volume mismatch between the lithiated and delithiated phases, and to more favorable particle morphologies. Mg2+ dilutes the concentration of Jahn–Teller active ion, Mn3+, and reduces local strains between the phases, and thereby increases the structural stability of the crystals. The result is a reduction in fracturing and decrepitation, which translates to improved electrochemical performance. Although the thermal stability improved with increasing Mg substitution, the heat evolved during reaction with electrolyte remains proportional to the Mn content and therefore to the theoretical capacity.

Graphical abstract: Improved kinetics and stabilities in Mg-substituted LiMnPO4

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Publication details

The article was received on 03 Dec 2010, accepted on 27 Jan 2011 and first published on 21 Feb 2011


Article type: Paper
DOI: 10.1039/C0JM04230G
Citation: J. Mater. Chem., 2011,21, 10126-10133
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    Improved kinetics and stabilities in Mg-substituted LiMnPO4

    G. Chen, A. K. Shukla, X. Song and T. J. Richardson, J. Mater. Chem., 2011, 21, 10126
    DOI: 10.1039/C0JM04230G

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