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论文类型：期刊论文

发表时间：2015-01-19

发表刊物：CHEMISTRY-A EUROPEAN JOURNAL

收录刊物：SCIE、EI、PubMed、Scopus

卷号：21

期号：4

页面范围：1520-1525

ISSN号：0947-6539

关键字：carbon; electrochemical performance; energy conversion; lithium ion batteries; porous materials

摘要：Porous carbon anodes with a controllable V-mes/V-mic ratio were synthesized through the self-assembly of poly(benzoxazine-co-resol) and the simultaneous hydrolysis of tetraethyl orthosilicate (TEOS) followed by carbonization and removal of silica. The V-mes/V-mic ratio of the carbon can be controlled in the range of approximately 1.3-32.6 through tuning the amount of TEOS. For lithium-ion battery anodes, a correlation between the electrochemical performance and V-mes/V-mic ratio has been established. A high V-mes/V-mic ratio in porous carbons is favorable for enhancing the accessibility of Li ions to active sites provided by the micropores and for achieving good lithium storage performance. The obtained porous carbon exhibits a high reversible capacity of 660 mAh g(-1) after 70 cycles at a current density of 100 mA g(-1). Moreover, at a high current density of 3000 mA g(-1), the capacity still remains at 215 mAh g(-1), showing a fast charge-discharge potential. This synthesis method relying on modified benzoxazine chemistry with the hydrolysis of TEOS may provide a new route for the development of mesoporous carbon-based electrode materials.