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Proceedings Paper

Improved layered mixed transition metal oxides for Li-ion batteries
Author(s): Marca M. Doeff; Thomas Conry; James Wilcox
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Paper Abstract

Recent work in our laboratory has been directed towards development of mixed layered transition metal oxides with general composition Li[Ni, Co, M, Mn]O2 (M=Al, Ti) for Li ion battery cathodes. Compounds such as Li[Ni1/3Co1/3Mn1/3]O2 (often called NMCs) are currently being commercialized for use in consumer electronic batteries, but the high cobalt content makes them too expensive for vehicular applications such as electric vehicles (EV), plug-in hybrid electric vehicles (PHEVs), or hybrid electric vehicles (HEVs). To reduce materials costs, we have explored partial or full substitution of Co with Al, Ti, and Fe. Fe substitution generally decreases capacity and results in poorer rate and cycling behavior. Interestingly, low levels of substitution with Al or Ti improve aspects of performance with minimal impact on energy densities, for some formulations. High levels of Al substitution compromise specific capacity, however, so further improvements require that the Ni and Mn content be increased and Co correspondingly decreased. Low levels of Al or Ti substitution can then be used offset negative effects induced by the higher Ni content. The structural and electrochemical characterization of substituted NMCs is presented in this paper.

Paper Details

Date Published: 21 April 2010
PDF: 9 pages
Proc. SPIE 7683, Energy Harvesting and Storage: Materials, Devices, and Applications, 768309 (21 April 2010); doi: 10.1117/12.851228
Show Author Affiliations
Marca M. Doeff, Lawrence Berkeley National Lab. (United States)
Thomas Conry, Lawrence Berkeley National Lab. (United States)
James Wilcox, Lawrence Berkeley National Lab. (United States)

Published in SPIE Proceedings Vol. 7683:
Energy Harvesting and Storage: Materials, Devices, and Applications
Nibir K. Dhar; Priyalal S. Wijewarnasuriya; Achyut Kumar Dutta, Editor(s)

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