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首页> 外文期刊>Chemistry: A European journal >Porous Carbon Anodes for a High Capacity Lithium-Ion Battery Obtained by Incorporating Silica into Benzoxazine During Polymerization
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Porous Carbon Anodes for a High Capacity Lithium-Ion Battery Obtained by Incorporating Silica into Benzoxazine During Polymerization

机译：聚合过程中将二氧化硅掺入苯并恶嗪制得的高容量锂离子电池用多孔碳阳极

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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.
机译：通过自组装聚苯并恶嗪-co-resol并同时水解原硅酸四乙酯（TEOS），然后碳化并除去二氧化硅，可以合成具有可控V-mes / V-mic比的多孔碳阳极。通过调节TEOS的量，可以将碳的V-mes / V-mic比率控制在约1.3-32.6的范围内。对于锂离子电池负极，已经建立了电化学性能和V-mes / V-mic比之间的相关性。多孔碳中的高V-mes / V-mic比率有利于增强锂离子对由微孔提供的活性位点的可及性，并有利于实现良好的锂存储性能。 70次循环后，在100 mA g（-1）的电流密度下，获得的多孔碳具有660 mAh g（-1）的高可逆容量。此外，在3000 mA g（-1）的高电流密度下，容量仍保持在215 mAh g（-1），显示出快速的充放电电势。该合成方法依赖于改性苯并恶嗪化学方法与TEOS的水解作用，可为中孔碳基电极材料的开发提供一条新途径。

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