%0 Journal Article
%A Müller, Jannes
%A Abdollahifar, Mozaffar
%A Vinograd, Andrey
%A Nöske, Markus
%A Nowak, Christine
%A Chang, Shu-Jui
%A Placke, Tobias
%A Haselrieder, Wolfgang
%A Winter, Martin
%A Kwade, Arno
%A Wu, Nae-Lih
%T Si-on-Graphite fabricated by fluidized bed process for high-capacity anodes of Li-ion batteries
%J The chemical engineering journal
%V 407
%@ 1385-8947
%C Amsterdam
%I Elsevier
%M FZJ-2021-05842
%P 126603 -
%D 2021
%Z Zudem unterstützt durch BMBF Projekt: 03XP0133C
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000607599400006
%R 10.1016/j.cej.2020.126603
%U https://juser.fz-juelich.de/record/904272