Si-on-Graphite fabricated by fluidized bed process for high-capacity anodes of Li-ion batteries
Si-on-Graphite fabricated by fluidized bed process for high-capacity anodes of Li-ion batteries
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-effic...
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Personal Name(s): | Müller, Jannes |
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Abdollahifar, Mozaffar / Vinograd, Andrey / Nöske, Markus / Nowak, Christine / Chang, Shu-Jui / Placke, Tobias / Haselrieder, Wolfgang / Winter, Martin / Kwade, Arno / Wu, Nae-Lih (Corresponding author) | |
Contributing Institute: |
Helmholtz-Institut Münster Ionenleiter für Energiespeicher; IEK-12 |
Published in: | The chemical engineering journal, 407 (2021) S. 126603 - |
Imprint: |
Amsterdam
Elsevier
2021
|
DOI: |
10.1016/j.cej.2020.126603 |
Document Type: |
Journal Article |
Research Program: |
LiBEST - Lithium-Ionen-Akku mit hoher elektrochemischer Leistung und Sicherheit Fundamentals and Materials |
Publikationsportal JuSER |
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. |