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The influence of CeO2 on electrochemical performance of LiMn2O4.
|Monika Michalska 1, Dominika Ziółkowska 2, Bartosz Hamankiewicz 3, Michał Krajewski 4, Mariusz Andrzejczuk 5, Ludwika Lipińska 1, Andrzej Czerwiński 3,4|
1. Institute of Electronic Materials Technology (ITME), Wólczyńska, Warsaw 01-919, Poland
This work is focused on analysis of the influence of cerium dioxide (CeO2) on electrochemical performance of lithium manganese oxide (LiMn2O4, LMO). Firstly, pure stoichiometric nanopowder of LiMn2O4 was prepared by modified sol-gel method using lithium and manganese salts. Secondly, the low temperature method (LTM) was used to modify the grain surface of pristine lithium manganese oxide powder. The LMO/n-CeO2 powders were analyzed by: XRD, Raman spectroscopy, SEM, TEM. The galvanostatic charge/discharge tests of the pristine and CeO2 modified LiMn2O4 cathode materials were conducted in the potential range: 3.5 to 4.5 V vs. Li/Li+ at room temperature. High current rates performance has been evaluated by determination of specific discharge capacity at current rates varied from 1 C to 30 C. Our work demonstrates that surface modification of LMO grains’ by using 1%wt. of CeO2 admixture improves cycling stability and capacity retention. Pristine LMO reveals 10% capacity loss after 100 cycles when discharged at 1C, while the sample modified with 1%wt. CeO2 grains retains ca. 98% of its initial discharge capacity after 100 cycles.
This work was supported by The National Centre for Research and Development through the research grant PBS1 (contract no. PBS1/A1/4/2012).
2. B. Hamankiewicz, M. Michalska, M. Krajewski, D. Ziolkowska, L. Lipińska, M. Kamińska, A. Czerwinski, The effect of electrode thickness on electrochemical performance of LiMn2O4 cathode synthesized by modified sol-gel method, Solid State Ionics 262 (2014) 9-13.
Presentation: Poster at Nano PL 2014, Symposium A, by Monika Michalska
See On-line Journal of Nano PL 2014
Submitted: 2014-08-01 22:42 Revised: 2014-09-28 20:48