期刊
CHEMICAL ENGINEERING JOURNAL
卷 407, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126603
关键词
Silicon-on-graphite composite; Fluidized bed process; Pitch coating; High capacity anode
资金
- Federal Ministry of Education and Research (BMBF) [03XP0133B, 03XP0133C]
- Projekttrager Julich (PTJ) [03XP0133B, 03XP0133C]
- Advanced Research Center for Green Materials Science and Technology from The Featured Area Research Center Program within Ministry of Education [109L9006]
- Ministry of Science and Technology (MOST) in Taiwan [MOST 109-2634-F-002-042, MOST-107-2221-E-002-106-MY3, MOST-108-2119-M-002-010, MOST 108-2923-E-011-002]
The study reports the fabrication of silicon-on-graphite composites using fluidized bed granulation for the first time, showing the formation of core-shell microstructure. By using a suitable binder during the process, the carbon-coated composites exhibit high capacity, high rate capability, and long cycle stability.
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 parallel to 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) parallel to Si@Gr full-cells.
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