Efficient Fabrication of Hierarchically Porous Graphene-Derived Aerogel and Its Application in Lithium Sulfur Battery
Efficient Fabrication of Hierarchically Porous Graphene-Derived Aerogel and Its Application in Lithium Sulfur Battery
复制标题
多级多孔石墨烯气凝胶的高效制备及其在锂硫电池中的应用。
DOI：
10.1021/acsami.5b12586
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发表时间：
2016
影响因子：
9.5
通讯作者：
Fang Jing
中科院分区：
文献类型：
--
作者：
Zhang Kai;Qin Furong;Lai Yanqing;Li Jie;Lei Xiaoke;Wang Mengran;Lu Hai;Fang Jing
通过一种高效的制备方法，合成了具有较高比表面积和孔体积的多级多孔碳/石墨烯气凝胶（CGA），该方法包括在孔壁上形成水热碳层作为支撑层，并直接将水热反应得到的湿水凝胶碳化，而不使用任何特殊的干燥技术。木薯粉被用作碳前体，这使得可持续的合成成为可能。湿水热产物的碳化过程是一个自活化过程，在碳化过程中产生了大量的孔隙。该气凝胶可作为锂硫电池用硫的封装主体。石墨烯作为高导电性的支架，加速了电子的传输。多级多孔结构有利于提高锂硫电池的电化学性能。因此，具有高硫负载和高硫含量的阴极可以提供非常好的性能。
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.