1. State Key Laboratory of Solidification Processing, Centre for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, P.R. China
2. Batteries Technology Department, Central Metallurgical Research and Development Institute (CMRDI), P.O. Box 87, 11911 Helwan, Cairo, Egypt