Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 691, Issue -, Pages 178-184Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.08.265
Keywords
Lithium ion battery; N-doped carbon; Silicon nanoparticle; Core shell structure; Ionic liquid
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Funding
- international Science & Technology Cooperation Program of China [2014DFE40130]
- National Natural Science Foundation of China [21373052, 51373035, 51373040, 51573030, 51573028]
- National Basic Research Program of China (973 program) [2014CB845602]
- Shanghai International Science and Technology Cooperation Project [15520720100]
- 1000 Youth Talents Plan
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Silicon is a potential next generation anode material for lithium-ion battery, however, its commercial application was hindered by its poor electronic conductivity and huge volume change upon lithiation. Herein, Si@N-doped carbon nanoparticles with commercial Si nanoparticle as the core and N-doped carbon as the shell were prepared by a facial, low-cost and scalable one-step method using ionic liquid (3-cyanopyridine/H2SO4) as both of the N and C sources. While using as anode material for lithium-ion batteries, Si@N-doped carbon exhibited a high reversible capacity of 725 mAh/g after 100 discharge/charge cycles at a current density of 420 mA/g, about twice higher than that of Si@C, a control sample prepared by a similar process using sucrose as the carbon precursor, which showed a capacity of 360 mAh/g after 100 cycles at 420 mA/g. The improved electrochemical performance could be ascribed to the stable core-shell structure of the nanocomposite and more importantly the doping of N element into the carbon shell. Furthermore, this work also provides a versatile strategy for preparation of core-shell N-doped carbon coated nanoparticles. (C) 2016 Elsevier B.V. All rights reserved.
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