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Electrochemical kinetics of nanostructure LiFePO4/graphitic carbon electrodes

Kisu, Kazuaki and Iwama, Etsuro and Naoi, Wako and Simon, Patrice and Naoi, Katsuhiko Electrochemical kinetics of nanostructure LiFePO4/graphitic carbon electrodes. (2016) Electrochemistry Communications, 72. 10-14. ISSN 1388-2481

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Official URL: http://dx.doi.org/10.1016/j.elecom.2016.08.013


Lithium cation insertion/deinsertion reaction kinetics in a LiFePO4 (LFP)/graphitic carbon composite material were electrochemically studied with a cavity microelectrode (CME). The LFP/graphitic carbon composite has a core LFP (crystalline/amorphous)/graphitic carbon shell structure. In the crystalline and amorphous LFP phase, different reaction mechanisms were observed and characterized. While the reaction mechanism in the crystalline LFP phase is controlled by Li+ diffusion, the amorphous LFP phase shows a fast, surface-controlled, pseudocapacitive charge-storage mechanism. This pseudocapacitive behavior is extrinsic in origin since it comes from the presence of Fe3 + defects in the structure. These features explain the ultrafast performance of the material which offers interesting opportunities as a positive electrode for assembling high power and high energy hybrid supercapacitors.

Item Type:Article
Additional Information:Thanks to Elsevier. The definitive version of this document is available at: http://dx.doi.org/10.1016/j.elecom.2016.08.013. This author's post-print version is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License.
HAL Id:hal-01457541
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > K & W Inc. (JAPAN)
Other partners > Tokyo University of Agriculture and Technology - TUAT (JAPAN)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Réseau de stockage électrochimique de l’énergie - Energie RS2E (FRANCE)
Laboratory name:
Deposited On:06 Feb 2017 13:59

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