Journal
NANOSCALE
Volume 6, Issue 23, Pages 14441-14445Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr05469e
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Funding
- National Natural Science Foundation of China [21136006, 21236003]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Shanghai Rising-Star Program [13QA1401100]
- Fundamental Research Funds for the Central Universities
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In order to mitigate the drastic volumetric expansion (>300%) of silicon (Si) during the lithiation process, we demonstrate the synthesis of novel Si nanowire arrays (n-SNWAs) with a coral-like surface on Cu foam via a one-step CVD method, in which the Cu foam can simultaneously act as a catalyst and current collector. The unique coral-like surface endows n-SNWAs with a high structural integrity, which is beneficial for enhancing their electrochemical performance. In addition, the as-prepared n-SNWAs on Cu foam can be directly applied as the anode for lithium-ion batteries (LIBs), exhibiting a very high reversible discharge capacity (2745 mA h g(-1) at 200 mA g(-1)) and a fast charge and discharge capability (884 mA h g(-1) at 3200 mA g(-1)), which is much higher than the conventional SNWAs (c-SNWAs, only 127 mA h g(-1) at 3200 mA g(-1)). Meanwhile, they deliver an improved cycling stability (2178 mA h g(-1) at 400 mA g(-1) after 50 cycles). More significantly, the as-synthesized n-SNWAs on Cu foam also possess a superior specific areal capacity of 4.1 mA h cm(-2) at 0.6 mA cm(-2). Such excellent electrochemical performance is superior, or at least comparable, to the best report for Si anode materials. Combining the cost-effective and facile preparation method, the present n-SNWAs on Cu foam can serve as a promising anode for LIBs.
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