Ball-flower-like carbon microspheres via a three-dimensional replication strategy as a high-capacity cathode in lithium–oxygen batteries

作     者：Liang Xiao Jingyu Yi Wen Meng Shiyao Wang Bohua Deng Jinping Liu 肖亮;易靖宇;孟文;王诗瑶;邓伯华;刘金平

作者机构：School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2019年第62卷第5期

页      面：633-644页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：supported by grants from the National Natural Science Foundation of China (21673169 and 51672205) the National Key R&D Program of China (2016YFA0202602) the Research Start-Up Fund from Wuhan University of Technology the Fundamental Research Funds for the Central Universities (WUT: 2017IB005, 2016IVA083) 

主　　题：three-dimensional replication porous carbon oxyrgen electrodes lithium-oxygen batteries zinc oxide nanostructure 

摘      要：The robust porous architectures of active materials are highly desired for oxygen electrodes in lithium–oxygen batteries to enable high capacities and excellent reversibility. Herein, we report a novel three-dimensional replication strategy to fabricate three-dimensional architecture of porous carbon for oxygen electrodes in lithium–oxygen batteries. As a demonstration, ball-flower-like carbon microspheres assembled with tortuous hollow carbon nanosheets are successfully prepared by completely replicating the morphology of the nanostructured zinc oxide template and utilizing the polydopamine coating layer as the carbon *** used as the active material for oxygen electrodes, the three-dimensional porous architecture of the prepared ballflower-like carbon microspheres can accommodate the discharge product lithium peroxide and simultaneously maintain the ions and gas diffusion paths. Moreover, their high degrees of defectiveness by nitrogen doping provide sufficient active sites for oxygen reduction/evolution *** the prepared ball-flower-like carbon microspheres demonstrate a high capacity of 9,163.7 mA h g-1 and excellent reversibility. This work presents an effective way to prepare three-dimensional architectures of porous carbon by replicating the controllable nanostructures of transition metal oxide templates for energy storage and conversion applications.