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Si-doped high-energy Li1.2Mn0.54Ni0.13Co0.13O2 cathode with improved capacity for lithium-ion batteries

Published online by Cambridge University Press:  07 December 2018

Leah Nation Open the ORCID record for Leah Nation [Opens in a new window] ,
Yan Wu ,
Christine James ,
Yue Qi ,
Bob R. Powell  and
Brian W. Sheldon
Leah Nation
Affiliation:
School of Engineering, Brown University, Providence, Rhode Island 02912, USA
Yan Wu*
Affiliation:
Global Research and Development, General Motors, Warren, Michigan 48092, USA
Christine James
Affiliation:
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA
Yue Qi
Affiliation:
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA
Bob R. Powell
Affiliation:
Global Research and Development, General Motors, Warren, Michigan 48092, USA
Brian W. Sheldon*
Affiliation:
School of Engineering, Brown University, Providence, Rhode Island 02912, USA
*
a)Address all correspondence to these authors. e-mail: yan.wu@essinc.com
b)e-mail: brian_sheldon@brown.edu
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Abstract

Li[Lix/3Mn2x/3M1−x]O2 (M = Ni, Mn, Co) (HE-NMC) materials, which can be expressed as a combination of trigonal LiTMO2 (TM = transition metal) and monoclinic Li2MnO3 phases, are of great interest as high capacity cathodes for lithium-ion batteries. However, structural stability prevents their commercial adoption. To address this, Si doping was applied, resulting in improved stability. Raman and differential capacity analyses suggest that silicon doping improves the structural stability during electrochemical cycling. Furthermore, the doped material exhibits a 10% higher capacity relative to the control. The superior capacity likely results from the increased lattice parameters as determined by X-ray diffraction (XRD) and the lower resistance during the first cycle found by impedance and direct current resistance (DCR) measurements. Density functional theory (DFT) predictions suggest that the observed lattice expansion is an indication of increased oxygen vacancy concentration and may be due to the Si doping.

Keywords

Lienergy storagedopant
Type
Invited Paper
Information
Journal of Materials Research , Volume 33 , Issue 24 , 28 December 2018 , pp. 4182 - 4191
Copyright
Copyright © Materials Research Society 2018 

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References

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