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Issue 13, 2014
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Chamber-confined silicon–carbon nanofiber composites for prolonged cycling life of Li-ion batteries

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Abstract

Silicon is a promising high capacity (4200 mA h g−1) anode material for lithium ion batteries but the significant volume change (over 300%) of silicon during lithiation/delithiation remains a challenge in terms of silicon pulverization and solid-electrolyte-interphase (SEI) accumulation in the silicon composite electrode. To alleviate the volumetric change of silicon, we built a flexible and self-supporting carbon-enhanced carbon nanofiber (CNF) structure with vacant chamber to encapsulate Si nanoparticles (vacant Si@CNF@C). This composite was tested directly without any polymer and current collector. The confined vacant chamber allowed the increasing volume of silicon and SEI accumulates to be well retained for a long cycle life. This chamber-confined silicon–carbon nanofiber composite exhibited an improved performance in terms of good cycling performance (620 mA h g−1), high coulombic efficiency (99%), and good capacity retention (80%) after 200 cycles. This self-supported silicon–carbon nanofiber structure showed high flexibility and good electrochemical performance for the potential as flexible electrode for lithium-ion batteries.

Graphical abstract: Chamber-confined silicon–carbon nanofiber composites for prolonged cycling life of Li-ion batteries

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Article information


Submitted
25 Jan 2014
Accepted
22 Apr 2014
First published
25 Apr 2014

Nanoscale, 2014,6, 7489-7495
Article type
Paper
Author version available

Chamber-confined silicon–carbon nanofiber composites for prolonged cycling life of Li-ion batteries

K. Fu, Y. Lu, M. Dirican, C. Chen, M. Yanilmaz, Q. Shi, P. D. Bradford and X. Zhang, Nanoscale, 2014, 6, 7489
DOI: 10.1039/C4NR00518J

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