TY  - JOUR
AU  - Müller, Jannes
AU  - Abdollahifar, Mozaffar
AU  - Vinograd, Andrey
AU  - Nöske, Markus
AU  - Nowak, Christine
AU  - Chang, Shu-Jui
AU  - Placke, Tobias
AU  - Haselrieder, Wolfgang
AU  - Winter, Martin
AU  - Kwade, Arno
AU  - Wu, Nae-Lih
TI  - Si-on-Graphite fabricated by fluidized bed process for high-capacity anodes of Li-ion batteries
JO  - The chemical engineering journal
VL  - 407
SN  - 1385-8947
CY  - Amsterdam
PB  - Elsevier
M1  - FZJ-2021-05842
SP  - 126603 -
PY  - 2021
N1  - Zudem unterstützt durch BMBF Projekt: 03XP0133C
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000607599400006
DO  - DOI:10.1016/j.cej.2020.126603
UR  - https://juser.fz-juelich.de/record/904272
ER  -