期刊
JOURNAL OF POWER SOURCES
卷 293, 期 -, 页码 976-982出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.06.019
关键词
Lithium-ion batteries; Graphene nanoplatelets; Anode; Nonstoichiometric silicon oxide; Electrochemical performance
资金
- Positec
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canadian Foundation for Innovation (CFI)
- Canada Research Chairs (CRC) program
- Natural Science Foundation of China [51374175]
Developing high-capacity electrode materials is critical to enhance the energy-density of lithium-ion batteries. Here, a new graphene nanoplatelets-supported SiOx-disordered carbon composite (SiOx-C/GNPs) is fabricated by a Stober-type process and high-temperature treatment. When used as an anode for lithium-ion batteries, SiOx-C/GNPs exhibits excellent cycle stability and rate capability even under deep charge discharge cycling. A stable reversible capacity of about 630 mAh g(-1) (calculated on the total mass of the composite) can be achieved at a current density of 100 mA g(-1) and the capacity retention is nearly 100% after 250 cycles. Additionally, the plateau voltages of lithium extraction for the composite are only slightly higher than those for the commercial graphite, which ensures the high energy density of the assembled batteries. The superior electrochemical performance of this novel material is due to its unique features: excellent electronic conductivity, short transportation length for both lithium ions and electrons, elastomeric space to accommodate volume changes upon Li insertion/extraction and robust connection between SiOx and GNPs. Crown Copyright (C) 2015 Published by Elsevier B.V. All rights reserved.
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