Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Poster Session

MM 26.61: Poster

Dienstag, 23. März 2010, 14:45–16:30, Poster C

Blends of LiMn2O4 Spinel and LiNi0.8Co0.15Al0.05O2 for Advanced Lithium-Ion Batteries — •Hai-Yen Tran, Corina Täubert, Peter Axmann, and Margret Wohlfahrt-Mehrens — Zentrum für Sonnenenergie- und Wasserstoff-Forschung, Helmholtzstrasse 8, D-89081 Ulm

Lithium manganese oxide spinel is a promising material for the positive electrode in lithium ion batteries due to the high abundance, low cost, non-toxicity, low irreversible capacity loss and high thermal stability. However, it suffers from relatively low discharge capacity, poor cycle life and poor electrochemical performance at elevated temperatures. Therefore, an interesting alternative would be to mix LiNi0.8Co0.15Al0.05O2 (NCA)and lithium manganese oxide spinel in defined ratios in order to compensate for their disadvantages each other. The aim is to obtain a material that could be comparable or even better than the conventional LiCoO2 with respect to discharge capacity, thermal stability and rate capability. In the present work we have evaluated the electrochemical performance of the mixed oxide electrodes by means of galvanostatic cycling with potential limitation. Blending the layered oxide (NCA) with manganese oxide spinel decreased the irreversible capacity loss and at the same time improved the rate capability of the electrodes. In addition, the manganese dissolution from the spinel structure was drastically reduced by NCA blending as well. The experimental results were compared to the theoretical calculations. The obtained results will be presented and discussed during the meeting.