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Unexpected discovery of low-cost maricite NaFePO_4 as a high-performance electrode for Na-ion batteries

Kim, Jongsoon and Seo, Dong-Hwa and Kim, Hyungsub and Park, Inchul and Yoo, Jung-Keun and Jung, Sung-Kyun and Park, Young-Uk and Goddard, William A., III and Kang, Kisuk (2015) Unexpected discovery of low-cost maricite NaFePO_4 as a high-performance electrode for Na-ion batteries. Energy and Environmental Science, 8 (2). pp. 540-545. ISSN 1754-5692. https://resolver.caltech.edu/CaltechAUTHORS:20150324-153007699

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Abstract

Battery chemistry based on earth-abundant elements has great potential for the development of cost-effective, large-scale energy storage systems. Herein, we report, for the first time, that maricite NaFePO_4 can function as an excellent cathode material for Na ion batteries, an unexpected result since it has been regarded as an electrochemically inactive electrode for rechargeable batteries. Our investigation of the Na re-(de)intercalation mechanism reveals that all Na ions can be deintercalated from the nano-sized maricite NaFePO_4 with simultaneous transformation into amorphous FePO_4. Our quantum mechanics calculations show that the underlying reason for the remarkable electrochemical activity of NaFePO_4 is the significantly enhanced Na mobility in the transformed phase, which is ~ one fourth of the hopping activation barrier. Maricite NaFePO_4, fully sodiated amorphous FePO_4, delivered a capacity of 142 mA h g^(−1) (92% of the theoretical value) at the first cycle, and showed outstanding cyclability with a negligible capacity fade after 200 cycles (95% retention of the initial cycle).


Item Type:Article
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URLURL TypeDescription
http://dx.doi.org/10.1039/C4EE03215BDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2015/EE/C4EE03215BPublisherArticle
http://www.rsc.org/suppdata/ee/c4/c4ee03215b/c4ee03215b1.pdfRelated ItemSupplementary Information
ORCID:
AuthorORCID
Goddard, William A., III0000-0003-0097-5716
Additional Information:© 2015 The Royal Society of Chemistry. Received 10th October 2014. Accepted 2nd December 2014. First published online 05 Jan 2015. This work was supported by the World Premier Materials grant funded by the Korea government Ministry of Trade, Industry and Energy and the Human Resources Development program (20124010203320) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy.
Funders:
Funding AgencyGrant Number
Ministry of Trade World Premier Materials (South Korea)UNSPECIFIED
Korea Institute of Energy Technology Evaluation and Planning (KETEP) Human Resources Development Program20124010203320
Ministry of Trade, Industry and Energy (South Korea)UNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20150324-153007699
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150324-153007699
Official Citation:Unexpected discovery of low-cost maricite NaFePO4 as a high-performance electrode for Na-ion batteries Jongsoon Kim, Dong-Hwa Seo, Hyungsub Kim, Inchul Park, Jung-Keun Yoo, Sung-Kyun Jung, Young-Uk Park, William A. Goddard III and Kisuk Kang Energy Environ. Sci., 2015, 8, 540-545 DOI: 10.1039/C4EE03215B
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56044
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:24 Mar 2015 23:18
Last Modified:03 Oct 2019 08:10

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