期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 45, 页码 22739-22749出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05879a
关键词
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资金
- National Natural Science Foundation of China [51274015]
- National Science Foundation [NSF-DMR 1505902]
- China Scholarship Council (CSC)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1505902] Funding Source: National Science Foundation
A novel C/SiO2 composite with a carbon-silica-carbon (C-mcms) three layer structure was synthesized and evaluated as an anode material for high-energy lithium ion batteries. The C-mcms exhibits an excellent capacity of about 1055 mA h g(-1) at a current density of 500 mA g(-1) after 150 cycles without detectable decay, and high-rate capability, which is superior to other similar composites without the carbon core or the carbon shell. The results indicate the structural effect on the enhancement of the electrochemical properties: the SiO2 nanoparticles are completely confined between the carbon shell and the carbon core; the two carbon parts work together to keep the structural integrity and to keep the electrode highly conductive and active during cycling, which guarantees high capacity and cycle stability; the interior pores and voids among the SiO2 nanoparticles can provide free space to accommodate the volume change and buffer the volume effect of the electrode during lithiation/delithiation.
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