https://scholars.lib.ntu.edu.tw/handle/123456789/546496
標題: | Si-on-Graphite fabricated by fluidized bed process for high-capacity anodes of Li-ion batteries | 作者: | M?ller, J. Abdollahifar, M. Vinograd, A. N?ske, M. Nowak, C. Chang, S.-J. Placke, T. Haselrieder, W. Winter, M. Kwade, A. Wu, N.-L. NAE-LIH WU |
關鍵字: | Fluidized bed process; High capacity anode; Pitch coating; Silicon-on-graphite composite | 公開日期: | 2020 | 來源出版物: | Chemical Engineering Journal | 摘要: | Composites consisting of graphite and silicon have been considered as potential high-capacity anode materials for the next-generation Li-ion batteries (LIBs). The synthesis method is critical for determining the microstructure, which is directly related to the material performance and the cost-efficiency for making commercial electrode materials. Herein, we report the fabrication of silicon-on-graphite (Si@Gr) composites by fluidized bed granulation (FBG) for the first time. The FBG process is shown to produce composite powders comprising a uniform layer of nano-sized Si particles lodged onto the surface of micron-sized graphite particles to possess a core-shell microstructure. Adopting a suitable binder during the FBG process enables a firm adhesion of the Si nanoparticles on graphite surface during subsequent carbon-coating, where the composite particles are coated with pitch and then carbonised to form a highly electronically conductive and mechanical stabilizing layer of amorphous carbon. These carbon-coated composites exhibit a high capacity reaching over 600 mAh g−1, high rate capability and illustrates the potential of long-cycle stability in Si@Gr Li metal cells, showing more than 70% capacity retention after 400 charge-discharge cycles even without electrolyte optimization. Furthermore, a significantly improved cycling stability is found for the carbon-coated Si@Gr materials in LiNi0.6Co0.2Mn0.2O2 (NCM-622) Si@Gr full-cells. © 2020 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.url?eid=2-s2.0-85092892404&partnerID=40&md5=579abb125ea32e484efc388383096c86 https://scholars.lib.ntu.edu.tw/handle/123456789/546496 |
DOI: | 10.1016/j.cej.2020.126603 | SDG/關鍵字: | Amorphous carbon; Amorphous silicon; Anodes; Electrolytes; Fabrication; Fluidized bed process; Fluidized beds; Graphite; Lithium compounds; Manganese compounds; Microstructure; Nickel compounds; Silicon; Silicon compounds; Carbon-coated composites; Charge-discharge cycle; Composite particles; Electrolyte optimizations; Fluidized bed granulation; High capacity anode; High rate capability; Material performance; Lithium-ion batteries |
顯示於: | 化學工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。