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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| Format: | Article |
| Language: | en_US |
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The Electrochemical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/79714 |
| _version_ | 1826213616946249728 |
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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. |
| first_indexed | 2024-09-23T15:52:06Z |
| format | Article |
| id | mit-1721.1/79714 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:52:06Z |
| publishDate | 2013 |
| publisher | The Electrochemical Society |
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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 |