1. CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB UMR 5026, F-33600 Pessac, France
2. Umicore, Materials Research and Development, Cheonan-Shi, Chungnam-Do 330-200, Korea
3. Umicore, Rechargeable Battery Materials, 31 rue du marais, Brussels BE-1000, Belgium