Electrochemical Performance of LiMnPO[subscript 4] Synthesized with Off-Stoichiometry
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Ceder_Electrochemical performance.pdf
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Author(s)
Kang, Byoungwoo
Ceder, Gerbrand
Date Issued
May 2010
Journal
Journal of The Electrochemical Society
Publisher
The Electrochemical Society
Citation
Kang, Byoungwoo, and Gerbrand Ceder. Electrochemical Performance of LiMnPO[sub 4] Synthesized with Off-Stoichiometry. Journal of The Electrochemical Society 157, no. 7 (2010): A808. © 2010 ECS - The Electrochemical Society
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Final published version
Abstract
LiMnPO[subscript 4] was synthesized from an off-stoichiometric mix of starting materials with nominal composition LiMn[subscript 0.9]P[subscript 0.95]O[subscript 4−δ]. Stoichiometric LiMnPO[subscript 4] with particle size <50 nm was found with X-ray diffraction even with the large overall deviation from stoichiometry in the sample, indicating that other noncrystalline compounds are present. The off-stoichiometric sample had a discharge capacity of 145 mAh/g at C/10 and ∼100mAh/g at 2C after a constant current constant voltage charge. Capacity retention was excellent without a significant capacity loss at 1C. The performance of LiMn[subscript 0.9]P[subscript 0.95]O[subscript 4−δ] could not be significantly improved by diluting the electrode with more carbon, indicating a more intrinsic kinetic limitation of the material for LiMnPO[subscript 4] in contrast to LiFePO[subscript 4] [Nature (London), 458, 190 (2009)]. This is further corroborated by the difference in the overpotential between the two materials. Although LiMnPO[subscript 4] has a sloping voltage profile, LiFePO[subscript 4] tends to have a constant overpotential at high rate.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1149/1.3428454
