Electrochemical Performance of LiMnPO[subscript 4] Synthesized with Off-Stoichiometry

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 deviati...

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Main Authors: Kang, Byoungwoo, Ceder, Gerbrand
Other Authors: Massachusetts Institute of Technology. Department of Materials Science and Engineering
Format: Article
Language:en_US
Published: The Electrochemical Society 2013
Online Access:http://hdl.handle.net/1721.1/79714
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author Kang, Byoungwoo
Ceder, Gerbrand
author2 Massachusetts Institute of Technology. Department of Materials Science and Engineering
author_facet Massachusetts Institute of Technology. Department of Materials Science and Engineering
Kang, Byoungwoo
Ceder, Gerbrand
author_sort Kang, Byoungwoo
collection MIT
description 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.
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spelling mit-1721.1/797142022-10-02T04:41:17Z Electrochemical Performance of LiMnPO[subscript 4] Synthesized with Off-Stoichiometry Kang, Byoungwoo Ceder, Gerbrand Massachusetts Institute of Technology. Department of Materials Science and Engineering Kang, Byoungwoo Ceder, Gerbrand 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. National Science Foundation (U.S.). Materials Research Science and Engineering Centers (Program) (Contract DMR-0819762) United States. Dept. of Energy. Batteries for Advanced Transportation Technologies (BATT) Program (Contract DE-AC02-05CH1123, Subcontract PO6806960) 2013-07-26T16:28:25Z 2013-07-26T16:28:25Z 2010-05 2010-03 Article http://purl.org/eprint/type/JournalArticle 00134651 1945-7111 http://hdl.handle.net/1721.1/79714 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 en_US http://dx.doi.org/10.1149/1.3428454 Journal of The Electrochemical Society Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf The Electrochemical Society MIT web domain
spellingShingle Kang, Byoungwoo
Ceder, Gerbrand
Electrochemical Performance of LiMnPO[subscript 4] Synthesized with Off-Stoichiometry
title Electrochemical Performance of LiMnPO[subscript 4] Synthesized with Off-Stoichiometry
title_full Electrochemical Performance of LiMnPO[subscript 4] Synthesized with Off-Stoichiometry
title_fullStr Electrochemical Performance of LiMnPO[subscript 4] Synthesized with Off-Stoichiometry
title_full_unstemmed Electrochemical Performance of LiMnPO[subscript 4] Synthesized with Off-Stoichiometry
title_short Electrochemical Performance of LiMnPO[subscript 4] Synthesized with Off-Stoichiometry
title_sort electrochemical performance of limnpo subscript 4 synthesized with off stoichiometry
url http://hdl.handle.net/1721.1/79714
work_keys_str_mv AT kangbyoungwoo electrochemicalperformanceoflimnposubscript4synthesizedwithoffstoichiometry
AT cedergerbrand electrochemicalperformanceoflimnposubscript4synthesizedwithoffstoichiometry