Permien, S., Indris, S., Neubuser, G., Fiedler, A., Kienle, L., Zander, S., Doyle, S., Richter, B. and Bensch, Wolfgang (2016) The Role of Reduced Graphite Oxide in Transition Metal Oxide Nanocomposites Used as Li Anode Material: An Operando Study on CoFe2O4/rGO. Chemistry - A European Journal, 22 (47). pp. 16927-16936. DOI 10.1002/chem.201603160.

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Abstract

A composite consisting of CoFe2O4 spinel nanoparticles and reduced graphite oxide (rGO) is studied as an anode material during Li uptake and release by applying synchrotron operando X-ray diffraction (XRD) and operando X-ray absorption spectroscopy (XAS), yielding a comprehensive picture of the reaction mechanisms. In the early stages of Li uptake, a monoxide is formed as an intermediate phase containing Fe2+ and Co2+ ions; this observation is in contrast to reaction pathways proposed in the literature. In the fully discharged state, metallic Co and Fe nanoparticles are embedded in an amorphous Li2O matrix. During charge, metallic Co and Fe are oxidized simultaneously to Co2+ and Fe3+, respectively, thus enabling a high and stable capacity to be achieved. Here, evidence is presented that the rGO acts as a support for the nanoparticles and prevents the particles from contact loss. The operando investigations are complemented by TEM, Raman spectroscopy, galvanostatic cycling, and cyclic voltammetry.

Document Type:	Article
Additional Information:	Times Cited: 0 Permien, Stefan Indris, Sylvio Neubueser, Gero Fiedler, Andy Kienle, Lorenz Zander, Stefan Doyle, Stephen Richter, Bjoern Bensch, Wolfgang
Keywords:	anode CoFe2O4/rGO lithium ion batteries nanoparticles operando
Research affiliation:	OceanRep > The Future Ocean - Cluster of Excellence Kiel University
Refereed:	Yes
Open Access Journal?:	No
Publisher:	American Medical Association
Projects:	Future Ocean
Date Deposited:	16 Mar 2017 07:51
Last Modified:	03 Jun 2019 15:23
URI:	https://oceanrep.geomar.de/id/eprint/36249

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