Journal Article

FZJ-2021-05842

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Si-on-Graphite fabricated by fluidized bed process for high-capacity anodes of Li-ion batteries

Müller, J. ; Abdollahifar, M. ; Vinograd, A. ; Nöske, M. ; Nowak, C. ; Chang, S.-J. ; Placke, T. ; Haselrieder, W. ; Winter, M.FZJ* ; Kwade, A. ; Wu, N.-L. (Corresponding author)

2021
Elsevier Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.cej.2020.126603

Abstract: 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.

Note: Zudem unterstützt durch BMBF Projekt: 03XP0133C

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
2. LiBEST - Lithium-Ionen-Akku mit hoher elektrochemischer Leistung und Sicherheit (13XP0133A) (13XP0133A)

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Database coverage:
; BIOSIS Previews ; Biological Abstracts ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 10 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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