A sulfur-carbon composite for lithium/sulfur battery based on activated vapor-grown carbon fiber

作者：Deng, Zhaofeng; Zhang, Zhian^*; Lai, Yanqing; Liu, Jin; Liu, Yexiang; Li, Jie

来源：Solid State Ionics, 2013, 238: 44-49.

DOI：10.1016/j.ssi.2013.03.018

• Lithium/sulfur batteries
• Composite cathode
• Vapor-grown carbon fiber
• Chemical activation
• Potassium hydroxide

A sulfur-carbon composite based on vapor-grown carbon fiber (VGCF) is synthesized for lithium/sulfur batteries by potassium hydroxide (KOH) activation and melt-diffusion strategy. The sulfur-activated VGCF (S-aVGCF) composites were characterized by field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and N-2 adsorption/desorption measurements. It is found that VGCF treated by KOH activation is longitudinally opened and presents a porous structure, and sulfur is embedded into the pores of an aVGCF network-like matrix after a melt-diffusion process. The S-aVGCF composite cathode exhibits better electrochemical reversibility, higher active material utilization and less severe polysulfide shuttle than both a pristine sulfur cathode and a S-raw VGCF composite cathode because of excellent conductivity, and the fibrous and porous structure of the aVGCF matrix.

• 出版日期2013-5-1
• 单位中南大学