Document Detail


Porous Doped Silicon Nanowires for Lithium Ion Battery Anode with Long Cycle Life.
MedLine Citation:
PMID:  22486769     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Porous silicon nanowires have been well studied for various applications; however, there are only very limited reports on porous silicon nanowires used for energy storage. Here, we report both experimental and theoretical study of porous doped silicon nanowires synthesized by direct etching of boron-doped silicon wafers. When using alginate as binder, porous silicon nanowires exhibited superior electrochemical performance and long cycle life as anode material in lithium ion battery. Even after 250 cycles, capacity remains stable above 2000, 1600 and 1100 mAh/g at current rates of 2 A/g, 4 A/g and18 A/g, respectively, demonstrating high structure stability due to the high porosity and electron conductivity of the porous silicon nanowires. A mathematic model coupling the lithium ion diffusion and the strain induced by lithium intercalation was employed to study the effect of porosity and pore size on the structure stability. Simulation shows silicon with high porosity and large pore size help to stabilize the structure during charge/discharge cycles.
Authors:
Mingyuan Ge; Jiepeng Rong; Xin Fang; Chongwu Zhou
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-9
Journal Detail:
Title:  Nano letters     Volume:  -     ISSN:  1530-6992     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088070     Medline TA:  Nano Lett     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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