Journal
MATERIALS RESEARCH BULLETIN
Volume 108, Issue -, Pages 170-175Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2018.09.004
Keywords
Porous silicon; Anode; Lithium ion batteries; Nitrogen-doped carbon
Categories
Funding
- National Natural Science Foundation of China [51502263]
- Qianjiang Talents Plan D [QJD1602029]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
- Startup Foundation for Hundred-Talent Program of Zhejiang University
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In this work, we develop a one-step carbonization method for constructing a core-shell structure of porous silicon with nitrogen-doped carbon layer for lithium-ion batteries. As a result, the porous silicon is evenly coated with a layer of nitrogen-doped carbon. Benefit from the internally stable structure of porous silicon and the support of external carbon layer, the whole electrode shows excellent structural stability. Excitingly, nitrogen-doped carbon layer is successfully obtained, and three different carbon-nitrogen species are identified, which significantly increases the electronic conductivity of composite electrode. Most importantly, the as prepared core-shell structure p-Si/NC composites deliver a stable cycling performance with 720 mA h g(-1) after 200 cycles at the current density of 200 mA g(-1) and a favorable rate capacity of 550 mA h g(-1) at the current density of 2 A g(-1). Additionally, the preparation process in this paper is more economical and feasible to achieve large-scale production.
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