Zhang Kai, Qin Furong, Lai Yanqing, Li Jie, Lei Xiaoke, Wang Mengran, Lu Hai, Fang Jing
School of Materials Science and Engineering, Central South University , Changsha 410083, China.
School of Metallurgy & Environment, Central South University , 410083, Changsha, China.
ACS Appl Mater Interfaces. 2016 Mar 9;8(9):6072-81. doi: 10.1021/acsami.5b12586. Epub 2016 Feb 25.
Hierarchically porous carbon/graphene aerogel (CGA) with relatively high surface area and pore volume is synthesized through an efficient fabrication strategy, which involves forming hydrothermal carbon layer on the pore wall as upholder and directly carbonizing the wet hydrogel from hydrothermal reaction, without using any special drying techniques. Cassava powder is used as carbon precursor which enables sustainable synthesis. Carbonizing the wet hydrothermal product is found to be a self-activation process, through which abundant pores are generated. The aerogel is used as host to encapsulate sulfur for lithium sulfur battery. Graphene, served as highly conductive scaffold, accelerates the transport of the electrons. The hierarchically porous structure is in favor of improving the electrochemical performance of lithium sulfur battery. Therefore, the cathode with high sulfur loading and high sulfur content can deliver very good performance.
通过一种高效的制备策略合成了具有相对较高比表面积和孔体积的分级多孔碳/石墨烯气凝胶（CGA），该策略包括在孔壁上形成水热碳层作为支撑体，并直接将水热反应产生的湿水凝胶碳化，无需使用任何特殊干燥技术。木薯粉用作碳前驱体，实现可持续合成。发现将湿水热产物碳化是一个自活化过程，通过该过程产生大量孔隙。该气凝胶用作锂硫电池中封装硫的主体。石墨烯作为高导电支架，加速电子传输。分级多孔结构有利于提高锂硫电池的电化学性能。因此，具有高硫负载量和高硫含量的阴极可以提供非常好的性能。
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