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研究论文

硫在不同碳载体材料中的电化学性能研究

  • 张 波 ,
  • 刘 佳 ,
  • 刘晓晨 ,
  • 李德军
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  • 1. 天津师范大学物理与材料科学学院能源材料工程中心,天津 300387;2. 天津市储能材料表面技术国际联合研究中心,天津 300387

收稿日期: 2018-12-04

  修回日期: 2019-02-18

  网络出版日期: 2019-12-28

基金资助

天津师范大学人才引进项目(No. 011/5RL132)资助

Electrochemical Properties of Sulfur in Different Carbon Support Materials

  • ZHANG Bo ,
  • LIU Jia ,
  • LIU Xiao-chen ,
  • LI De-jun
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  • 1. Energy & Materials Engineering Centre, College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China; 2. Tianjin International Joint Research Centre of Surface Technology for Energy Storage Materials, Tianjin 300387, China

Received date: 2018-12-04

  Revised date: 2019-02-18

  Online published: 2019-12-28

摘要

为了探索碳载体材料结构对于硫的电化学性能的影响,本文通过高温固相法将升华硫与石墨烯、导电炭黑、多孔碳等三种不同结构的碳载体材料复合,制备得到硫含量相近的三种硫碳复合材料. 通过电镜扫描、低温氮吸附、X射线衍射等方法,对所制备的硫碳复合材料的结构和硫的分布状态进行了表征和分析. 并进一步对三种复合材料进行了电化学性能测试,结果表明,硫负载到多孔碳中的电化学性能最好,其初始放电比容量达到了1623.2 mA·h·g-1,循环100周之后,其放电比容量仍能保持在845 mA·h·g-1. 这主要因为相比于石墨烯的层状结构和导电炭黑的链状结构,多孔碳材料中含有大量的微孔和介孔,负载硫后,与硫分子的接触面积大,活性物质的利用率高,从而提高了硫的电化学性能.

本文引用格式

张 波 , 刘 佳 , 刘晓晨 , 李德军 . 硫在不同碳载体材料中的电化学性能研究[J]. 电化学, 2019 , 25(6) : 749 -756 . DOI: 10.13208/j.electrochem.181117

Abstract

In order to investigate the effect of carbon structure on electrochemical performance of sulfur/carbon composite in lithium-sulfur battery, in this paper, sublimation sulfur was incorporated into three types of carbon materials, namely, graphene, carbon black and porous carbon. The three sulfur/carbon composites were characterized by scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), and X-ray diffraction (XRD) techniques, and their electrochemical performances were also studied. The results showed that the sulfur/porous carbon composite offered an initial discharge capacity of 1623.2 mA·h·g-1 and remained 845 mA·h·g-1 after 100 cycles. Compared with graphene and carbon black, the mesopores and micropores in porous carbon improved the utilization of sulfur, contributing to better electrochemical performance of sulfur.
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