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Activation of nano-Ca2MnO4 for electrochemical lithium intercalation

Published online by Cambridge University Press:  07 August 2015

Yuri Surace ,
Mário Simões ,
Lassi Karvonen ,
Corsin Battaglia ,
Simone Pokrant  and
Anke Weidenkaff
Yuri Surace
Affiliation:
Laboratory Materials for Energy Conversion, EMPA - Swiss Federal Laboratories for Materials Science and Technology, Uberlandstrasse 129, CH-8600 Dübendorf, Switzerland
Mário Simões
Affiliation:
Laboratory Materials for Energy Conversion, EMPA - Swiss Federal Laboratories for Materials Science and Technology, Uberlandstrasse 129, CH-8600 Dübendorf, Switzerland
Lassi Karvonen
Affiliation:
Laboratory Materials for Energy Conversion, EMPA - Swiss Federal Laboratories for Materials Science and Technology, Uberlandstrasse 129, CH-8600 Dübendorf, Switzerland
Corsin Battaglia
Affiliation:
Laboratory Materials for Energy Conversion, EMPA - Swiss Federal Laboratories for Materials Science and Technology, Uberlandstrasse 129, CH-8600 Dübendorf, Switzerland
Simone Pokrant
Affiliation:
Laboratory Materials for Energy Conversion, EMPA - Swiss Federal Laboratories for Materials Science and Technology, Uberlandstrasse 129, CH-8600 Dübendorf, Switzerland
Anke Weidenkaff
Affiliation:
Materials Chemistry, Institute for Materials Science, University of Stuttgart, Heisenbergstr. 3, DE-70569 Stuttgart; Germany
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Abstract

Ca2MnO4 nanoparticles were prepared by the Pechini method and acid treated to extract Ca2+ ions. Structural, morphological and spectroscopic analyses by XRD, SEM/EDX, TEM/EDS and Raman revealed the formation of an amorphous outer layer at the particles surface with a preserved inner crystalline bulk. Thanks to the outer layer, which is electrochemically active, the acid-treated compounds showed capacity up to 150 Ah/kg. The crystalline bulk improved cycling stability, allowing reaching capacity retention up to 70% after 30 cycles.

Keywords

energy storagesol-gelcore/shell
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1805: Symposium SS/TT – Fabrication and Properties of Oxide Thin Films, Nanostructures and Interfaces for Advanced Applications , 2015 , mrss15-2133233
Copyright
Copyright © Materials Research Society 2015 

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References

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