无机材料学报 ›› 2013, Vol. 28 ›› Issue (10): 1127-1131.DOI: 10.3724/SP.J.1077.2013.13017 CSTR: 32189.14.SP.J.1077.2013.13017

• 研究论文 • 上一篇    下一篇

负载ZnS的介孔炭复合硫正极材料的制备及性能研究

陈 龙, 刘景东, 张诗群   

  1. (福州大学 化学化工学院, 福州 350108)
  • 收稿日期:2013-01-08 修回日期:2013-03-18 出版日期:2013-10-20 网络出版日期:2013-09-18
  • 作者简介:陈 龙(1988–), 男, 硕士研究生. E-mail: 574278287@qq.com
  • 基金资助:

    国家基础科学人才培养基金(J1103303)

Preparation of Mesoporous Carbon/Sulfur Composite Loaded with ZnS and Its Property for Lithium-sulfur Batteries

CHEN Long, LIU Jing-Dong, ZHANG Shi-Qun   

  1. (College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, China)
  • Received:2013-01-08 Revised:2013-03-18 Published:2013-10-20 Online:2013-09-18
  • About author:CHEN Long. E-mail: 574278287@qq.com
  • Supported by:

    National Science Foundation for Fostering Talents in Basic Research of China (J1103303)

摘要: 为了获得高性能的锂硫电池正极材料, 采用先超声分散再进行热处理的方法制备了负载ZnS的介孔炭复合材料(ZnS/MC), 进而用热复合法获得负载有ZnS的介孔炭复合硫正极材料(ZnS/MC/S)。XRD、SEM、EDS和N2吸附脱附等温线表明, 当ZnS含量低于17wt%时, 通过超声波分散, ZnS可以均匀负载到介孔炭中; 但热处理或提高ZnS含量时ZnS会发生聚集, 形成闪锌矿型ZnS晶相。循环伏安测试表明, ZnS对多硫离子的氧化起促进作用; 充放电测试表明, ZnS/MC/S电极的初始放电比容量为1354.6 mAh/g, 首次充放电库仑效率为98.7%; 50次循环后容量仍有650 mAh/g。

关键词: 锂硫电池, ZnS, 介孔炭, 超声波分散, 循环性能

Abstract: With the aim to obtain high performance cathode materials for lithium-sulfur batteries, composite of mesoporous carbon (MC) loaded with ZnS (ZnS/MC) was prepared through ultrasonic dispersion and heat treatment. The as-prepared composite was blended with elemental sulfur by heating, then cathode materials (ZnS/MC/S) was obtained. The ZnS/MC composite was characterized by XRD, SEM, EDS and N2 adsorption-desorption isotherms. The results showed that ZnS particle was uniformly loaded to the surface of MC through ultrasonic dispersion when content of ZnS was less than 17wt%. ZnS nanoparticles aggregated to form sphalerite ZnS by heat treatment or increasing content of ZnS. Cyclic voltammetry test showed that ZnS accelerated the oxidation process of polysulfides. Charge/ discharge tests indicated that the initial discharge specific capacity was 1354.6 mAh/g, while the coulombic efficiency of the first charge and discharge was 98.7%. The capacity still remained 650 mAh/g after 50 cycles.

Key words: lithium sulfur battery, ZnS, mesoporous carbon, ultrasonic dispersion, cyclic performance

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