High rate capabilities induced by multi-phasic nanodomains in iron-substituted calcium cobaltite electrodes

Young-Dae Ko; Jin-Gu Kang; Kyung Jin Choi; Jae-Gwan Park; Jae-Pyoung Ahn; Kyung Yoon Chung; Kyung-Wan Nam; Won-Sub Yoon; Dong-Wan Kim

doi:10.1039/B817120C

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High rate capabilities induced by multi-phasic nanodomains in iron-substituted calcium cobaltite electrodes†

Young-Dae Ko,^a Jin-Gu Kang,^a Kyung Jin Choi,^a Jae-Gwan Park,^a Jae-Pyoung Ahn,^b Kyung Yoon Chung,^c Kyung-Wan Nam,^d Won-Sub Yoon^e and Dong-Wan Kim ‡*^a

Author affiliations

* Corresponding authors

^a Nano-Materials Research Center, Korea Institute of Science and Technology, Seoul, Korea
E-mail: dongwan1@empal.com

^b Advanced Analysis Center, Korea Institute of Science and Technology, Seoul, Korea

^c Battery Research Center, Korea Institute of Science and Technology, Seoul, Korea

^d Chemistry Department, Brookhaven National Laboratory, Upton, NY, USA

^e School of Advanced Materials Engineering, Kookmin University, Seoul, Korea

Abstract

Two-dimensional (2-D) nanoplates of iron-substituted calcium cobaltite (Ca₃Co₃FeO₉) are synthesized through a simple citrate-gel method. The lithium electroactivity of Ca₃Co₃FeO₉ demonstrates that this is an applicable active anode material. In this study, we focus on the reversible conversion process and internally multi-phasic, nanostructured character occurring in Ca₃Co₃FeO₉ nanoplates. Moreover, we demonstrate that in-situ formation of active/inactive nanocomposite improves the conversion reaction kinetics by accommodating the large volume changes during lithium uptake and removal, thereby achieving outstanding rate capabilities.

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Supplementary files

XRD patterns of the Ca ₃Co ₃FeO ₉ nanoplates, EELS spectra of fully lithiated Ca ₃Co ₃FeO ₉, normalized Co and Fe K-edge XANES spectra for Ca ₃Co ₃FeO ₉ in the charged and discharged states taken after the first 2 cycles, impedance spectrum of the Ca ₃Co ₃FeO ₉/Li half cell in the discharged state taken after 20 cycles at a C/5 rate, variation of R _el versus the cycle number for Ca ₃Co ₃FeO ₉ and Co ₃O ₄ cycled at a rate of 1C, and charging-discharging curves for the Ca ₃Co ₃FeO ₉/Li and Co ₃O ₄/Li half cells cycled at a rate of 1C during the impedance measurements PDF (590K)

Article information

DOI: https://doi.org/10.1039/B817120C
Article type: Paper
Submitted: 30 Sep 2008
Accepted: 24 Nov 2008
First published: 12 Feb 2009

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J. Mater. Chem., 2009,19, 1829-1835

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High rate capabilities induced by multi-phasic nanodomains in iron-substituted calcium cobaltite electrodes

Y. Ko, J. Kang, K. J. Choi, J. Park, J. Ahn, K. Y. Chung, K. Nam, W. Yoon and D. Kim, J. Mater. Chem., 2009, 19, 1829 DOI: 10.1039/B817120C

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Journal of Materials Chemistry

High rate capabilities induced by multi-phasic nanodomains in iron-substituted calcium cobaltite electrodes†

Abstract

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High rate capabilities induced by multi-phasic nanodomains in iron-substituted calcium cobaltite electrodes

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