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Effects of Aluminum Doping on The Phase Stability and Electrochemical Properties of LiCoO2 and LiMnO2

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Abstract

Aluminum is of interest as a constituent for Li battery electrodes due to its low cost and low mass, and because ab initio calculations indicate that solid solution of LiAlO2 with LiMO2 (M = transition metal) in the α-NaFeO2 structure can increase intercalation voltage [1]. In this study, we investigated the effect of Al doping on LiCoO2 and LiMnO2. Single phase LiAlyCo1-yO2 has been synthesized up to y = 0.5 by firing homogenous hydroxide precursors. A systematic increase in the open circuit voltage is observed with Al content. In LiAlyMn1-yO2, the addition of LiAlO2 stabilizes LiMnO2 in the α-NaFeO2 structure under conditions where neither endmember is stable in the structure. High reversible capacity was obtained over both a 4 V and 3 V plateau, indicating that the compound transforms to a spinel-related structure during cycling, but that the cooperative Jahn-Teller distortion is suppressed.

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Acknowledgement

We thank G. Ceder and A. M. Mayes for helpful discussions. This work was supported by Furukawa Electric Company and the Idaho National Engineering and Environmental Laboratory under Grant No. C95s-175002, and used instrumentation in the Shared Central Facilities at MIT, supported by NSF Grant No. 9400334s-DMR.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    Y.-I. Jang, B. Huang, H. Wang, Y.-M. Chiang & D. R. Sadoway

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  1. Y.-I. Jang
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  2. B. Huang
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  3. H. Wang
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  4. Y.-M. Chiang
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  5. D. R. Sadoway
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Jang, YI., Huang, B., Wang, H. et al. Effects of Aluminum Doping on The Phase Stability and Electrochemical Properties of LiCoO2 and LiMnO2. MRS Online Proceedings Library 496, 403–408 (1997). https://doi.org/10.1557/PROC-496-403

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  • DOI: https://doi.org/10.1557/PROC-496-403

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