Journal
CHEMICAL ENGINEERING JOURNAL
Volume 313, Issue -, Pages 187-196Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.12.072
Keywords
Si/C composite; Lithium-ion batteries; Self-assembly; Sub-micron silicon
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Funding
- Primary Research & Development Plan of Jiangsu Province [8E2016183]
- National Natural Science Foundation of China [51502135]
- Natural Science Foundation of Jiangsu Province for Youth [BK20160960]
- Postgraduate Innovation Foundation of Jiangsu Province [KYZZ16_0242]
- Grants-in-Aid for Scientific Research [25288054] Funding Source: KAKEN
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Si/C@NGs composite containing flake-shaped sub-micron sized silicon (Si) enwrapped by pyrolyzed carbon and natural graphite (NG) was successfully prepared by spray-drying-assisted self-assembly method and was systematically studied as an anode material for lithium-ion batteries. The as-prepared Si/C@NGs composite material has a loading amount of sub-micron sized silicon as low as 6.7 wt%. The Si/C@NGs composite has a hierarchical structure with Si/C embedded into natural graphite which further assembles into larger secondary particles of similar to 20-50 mu gm. Compared with pure silicon, the as-synthesized Si/C@NGs composite has multi-layer carbon coating as well as voids to alleviate the structural changes of Si during charging/discharging, exhibits an initial efficiency of 82.8% and a capacity retention of 428.1 mA h g(-1) (1524.0 mA h g(-1) vs. Si) after 100 cycles at 0.1 A g(-1). The remarkable cycling performances, high initial cycle efficiency together with low-cost manufacturing process make Si/C@NGs composite appealing for commercial applications. (C) 2016 Elsevier B.V. All rights reserved.
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