Large-scale synthesis of ordered mesoporous carbon fiber and its application as cathode material for lithium-sulfur batteries
Large-scale synthesis of ordered mesoporous carbon fiber and its application as cathode material for lithium-sulfur batteries
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DOI：
10.1016/j.carbon.2014.10.024
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发表时间：
2015
期刊：
影响因子：
10.9
通讯作者：
Hongqiang Wang;Chaofeng Zhang;Zhixin Chen;Huakun Liu;Zaiping Guo
中科院分区：
文献类型：
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作者：
Hongqiang Wang;Chaofeng Zhang;Zhixin Chen;Huakun Liu;Zaiping Guo
以三嵌段共聚物Pluronic F127为模板剂，甲阶酚醛树脂为碳源，采用静电纺丝技术制备了一种新型的一维有序介孔碳纤维。然后通过简单的热处理将硫封装在这种有序的中孔碳纤维中。交织的纤维纳米结构具有有利的机械稳定性，并且可以在循环期间为硫和多硫化物提供有效的导电网络。有序介孔也能抑制长链多硫化物的扩散。所得的有序介孔碳纤维硫（OMCF-S）复合材料具有较高的可逆容量、良好的容量保持率和增强的倍率容量，当用作可充电锂硫电池的阴极时。得到的OMCF-S电极在0.3C下保持690 mAh/g的稳定放电容量，甚至在300次循环后。
A novel type of one-dimensional ordered mesoporous carbon fiber has been prepared via the electrospinning technique by using resol as the carbon source and triblock copolymer Pluronic F127 as the template. Sulfur is then encapsulated in this ordered mesoporous carbon fibers by a simple thermal treatment. The interwoven fibrous nanostructure has favorably mechanical stability and can provide an effective conductive network for sulfur and polysulfides during cycling. The ordered mesopores can also restrain the diffusion of long-chain polysulfides. The resulting ordered mesoporous carbon fiber sulfur (OMCF-S) composite with 63% S exhibits high reversible capacity, good capacity retention and enhanced rate capacity when used as cathode in rechargeable lithium–sulfur batteries. The resulting OMCF-S electrode maintains a stable discharge capacity of 690 mAh/g at 0.3 C, even after 300 cycles.