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Impact of Surface Chemistry on the Electrochemical Performance of LiCoO2

Published online by Cambridge University Press:  26 February 2011

Nathalie Pereira ,
Jafar Al-Sharab ,
Frederic Cosandey ,
Fadwa Badway  and
Glenn Amatucci
Nathalie Pereira
Affiliation:
npereira@rci.rutgers.edu, Rutgers, The State University of New Jersey, Energy Storage Research Group, Department of Materials Science and Engineering, 671 US Highway 1, North Brunswick, NJ, 08902, United States
Jafar Al-Sharab
Affiliation:
jafarhan@rci.rutgers.edu, Rutgers, The State University of New Jersey, Department of Materials Science and Engineering, North Brunswick, NJ, 08902, United States
Frederic Cosandey
Affiliation:
cosandey@rci.rutgers.edu, Rutgers, The State University of New Jersey, Department of Materials Science and Engineering, North Brunswick, NJ, 08902, United States
Fadwa Badway
Affiliation:
fbadway@rci.rutgers.edu, Rutgers, The State University of New Jersey, Energy Storage Research Group, Department of Materials Science and Engineering, 671 US Highway 1, North Brunswick, NJ, 08902, United States
Glenn Amatucci
Affiliation:
gamatucc@rci.rutgers.edu, Rutgers, The State University of New Jersey, Energy Storage Research Group, Department of Materials Science and Engineering, 671 US Highway 1, North Brunswick, NJ, 08902, United States
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Abstract

For almost a decade there have been spurious reports that high specific capacity LiCoO2 can be stabilized through modification of the synthesis protocol, however no basis for this improvement was ever proven. In this study, high specific capacity (190 mAh/g) LiCoO2 with good cycling stability was successfully fabricated in this study with the purpose to identify the basis for, and reproduce the high specific capacity. Extensive physical and electrochemical characterization confirmed the improvement was directly related to the surface chemistry as opposed to bulk modification of the crystal chemistry. In particular, high resolution transmission electron microscopy confirmed the thermodynamic growth of a distinct surface phase of 5-10nm on the best materials. In contrast to extrinsically deposited surface coating, the intrinsic approach enabled a one step synthesis and modification using intrinsic constituents to result in a 5-10nm uniform coating of a cubic cobaltite based on fundamental phase stabilities as dictated by the phase diagram of the Li-Co-O system.

Keywords

energy-storageintercalationsurface chemistry
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA13-10
Copyright
Copyright © Materials Research Society 2007

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