Si-on-Graphite fabricated by fluidized bed process for high-capacity anodes of Li-ion batteries
Jannes Müller, Mozaffar Abdollahifar, Andrey Vinograd, Markus Nöske, Christine Nowak, Shu-Jui Chang, Tobias Placke, Wolfgang Haselrieder, Martin Winter, Arno Kwade and Nae‑Lih Wu
The publication deals with a new scalable process route for the manufacturing of silicon-graphite composites as novel anode material for lithium-ion batteries. With fluidized bed granulation a core-shell structure with a homogeneous coating of silicon nanoparticles on graphite (Si@Gr) could be achieved. Subsequent pitch coating and carbonization at high temperatures lead to the formation of an electrical conductive and mechanical stabilizing layer of amorphous carbon around the silicon-graphite composite particles (Si@Gr/C). This defined structure enabled high initial capacity of 600 mAh g-1, high rate capability up to 5 C and a capacity retention of more than 70 % after 400 cycles in half-cells. Furthermore, the superior performance of the new material was also demonstrated in full-cells.