通过在多孔碳球表面生长碳纳米管制备的用于锂硫电池的CS-CNTs同质结。

CS-CNTs homojunctions prepared bygrowth of carbon nanotubes on the surface of porous carbon spheres for lithium-sulfur batteries.

作者信息

Qi Man, Liu Yingxue, Li Qing, Yu Youchun, Gu Jianmin, Bai Zhitao, Yan Shuxin, Wang Liqiu, Liu Yuwen

机构信息

Hebei Key Laboratory of Applied Chemistry, Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, People's Republic of China.

College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, People's Republic of China.

出版信息

Nanotechnology. 2021 Sep 2;32(47). doi: 10.1088/1361-6528/ac1d08.

DOI:10.1088/1361-6528/ac1d08

PMID:34384073

Abstract

Lithium-sulfur battery is expected to become a new generation of commercial battery owing to its ultra-high theoretical specific capacity, low-cost, and environmental benign. However, the inherent insulation of sulfur and the shuttle effect of lithium polysulfide between electrodes limit the application of lithium-sulfur battery. In order to solve these problems, we focus on the design of carbon-sulfur composite structure. Herein, CS-CNTs homojunctions featured with the carbon nanotubes (CNTs)grown on carbon sphere (CS) is designed and synthesized by simple polymerization and heat treatment. The composites of CS with interconnected pore networks and CNTs with high conductivity not only offer a conductive framework to promote fast electron transmission, but also provide a larger space to load sulfur and effectively capture polysulfides. The CS-CNTs@S cathode shows better electrochemical performance compared with CS-CPs@S and CS@S. The first discharge specific capacity is 1053 mAh gat 0.1 C. After 200 cycles, the specific capacity still remains at 427 mAh g.

摘要

锂硫电池因其超高的理论比容量、低成本和环境友好性，有望成为新一代商用电池。然而，硫的固有绝缘性以及多硫化锂在电极之间的穿梭效应限制了锂硫电池的应用。为了解决这些问题，我们专注于碳硫复合结构的设计。在此，通过简单的聚合和热处理设计并合成了以生长在碳球（CS）上的碳纳米管（CNTs）为特征的CS-CNTs同质结。具有相互连接的孔网络的CS与具有高导电性的CNTs的复合材料不仅提供了一个导电框架以促进快速电子传输，而且还提供了更大的空间来负载硫并有效捕获多硫化物。与CS-CPs@S和CS@S相比，CS-CNTs@S阴极表现出更好的电化学性能。在0.1 C下首次放电比容量为1053 mAh g。经过200次循环后，比容量仍保持在427 mAh g。