Electrochemical performance of LiMnPO4 synthesized with off-stoichiometry
SCIE
SCOPUS
- Title
- Electrochemical performance of LiMnPO4 synthesized with off-stoichiometry
- Authors
- Kang, B; Gerbrand Ceder
- Date Issued
- 2010-10
- Publisher
- The electrochemical Society
- Abstract
- LiMnPO4 was synthesized from an off-stoichiometric mix of starting materials with nominal composition LiMn0.9P0.95O4-delta. Stoichiometric LiMnPO4 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 similar to 100 mAh/g at 2C after a constant current constant voltage charge. Capacity retention was excellent without a significant capacity loss at 1C. The performance of LiMn0.9P0.95O4-delta could not be significantly improved by diluting the electrode with more carbon, indicating a more intrinsic kinetic limitation of the material for LiMnPO4 in contrast to LiFePO4 [Nature (London), 458, 190 (2009)]. This is further corroborated by the difference in the overpotential between the two materials. Although LiMnPO4 has a sloping voltage profile, LiFePO4 tends to have a constant overpotential at high rate. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3428454] All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11182
- DOI
- 10.1149/1.3428454
- ISSN
- 0013-4651
- Article Type
- Article
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, vol. 157, no. 7, page. A808 - A811, 2010-10
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