期刊
CARBON
卷 77, 期 -, 页码 275-280出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.05.030
关键词
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资金
- National Science Foundation for Post-doctoral Scientists of China [2013M542153]
- Key Technical Project of Strategic Emerging Industries of Guangdong Province [2011A010802001]
- Guangdong Natural Science Funds [S2013050014408]
- NSFC [51372280, 51173213, 51172290, 51232005]
- Program for New Century Excellent Talents in University [NCET-12-0572]
- Program for Pearl River New Star of Science and Technology in Guangzhou [2013J2200015]
- Fundamental Research Funds for the Central Universities [13lgpy57]
- National Key Basic Research Program of China [2014CB932400]
A class of carbon/silica composite with a porous bicontinuous nanostructure is prepared via a simple sol-gel method and then used as anode material for lithium-ion batteries. The reversible specific capacity of the as-prepared composite stays over 560 mAh g(-1) after 30 cycles, much higher than that of many other carbon materials including commercial graphite and carbon/silica composites. The good electrochemical performance can be ascribed to the following three factors: (i) continuous silica gel framework stores most of lithium ions; (ii) continuous carbon framework not only restrains the volume change during repeated insertion and extraction of lithium ions, but also represents an excellent conductive skeleton throughout the composite; (iii) nanopores among the carbon/silica bicontinuous framework are helpful to the mass transport and can further buffer the volume change of silica. (C) 2014 Elsevier Ltd. All rights reserved.
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