高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (8): 1782-1789.doi: 10.7503/cjcu20180067

• 物理化学 • 上一篇    下一篇

羟基化多壁碳纳米管三明治隔膜对锂硫电池电化学性能的改善

王杰, 孙晓刚(), 陈玮, 李旭, 黄雅盼, 魏成成, 胡浩, 梁国东   

  1. 南昌大学机电工程学院, 南昌 330031
  • 收稿日期:2018-01-22 出版日期:2018-08-10 发布日期:2018-05-07
  • 作者简介:联系人简介: 孙晓刚, 男, 博士, 教授, 主要从事碳纳米管和锂离子电池研究. E-mail: xiaogangsun@163.com
  • 基金资助:
    江西省高等学校科技落地计划项目(批准号: KJLD13006)资助.

Electrochemical Performance of Hydroxylated Multi-walled Carbon Nanotube Sandwich Separator in Lithium-sulfur Battery

WANG Jie, SUN Xiaogang*(), CHEN Wei, LI Xu, HUANG Yapan, WEI Chengcheng, HU Hao, LIANG Guodong   

  1. School of Mechantronics Engineering, Nanchang University, Nanchang 330031, China
  • Received:2018-01-22 Online:2018-08-10 Published:2018-05-07
  • Contact: SUN Xiaogang E-mail:xiaogangsun@163.com
  • Supported by:
    † Supported by the Fund of Science & Technology Transformation Program for Universities in Jiangxi Province, China(No.KJLD13006).

摘要:

先利用羟基化多壁碳纳米管(MWCNTs-OH)与纸纤维制备了复合纤维纸(MWCNTs-OHP), 然后将该复合纤维纸夹在两层PP隔膜之间组装三明治结构隔膜(PP@MWCNTs-OHP@PP)并应用于锂硫电池. 利用透射电子显微镜(TEM)、 扫描电子显微镜(SEM)、 红外光谱和元素能谱分析(EDS)等对材料进行结构和性能表征. 电化学测试结果表明, PP@MWCNTs-OHP@PP三明治隔膜有效提高了锂硫电池的性能. 在0.1C倍率下, 电池首次放电比容量达到1532 mA·h/g, 活性物质的利用率达到91.5%. 在1C倍率下充放电循环500周后, 放电比容量依然维持516 mA·h/g, 每周循环衰减率为0.028%, 库仑效率保持在96.4%以上. 充放电倍率从3C减小到0.1C后, 放电比容量从336 mA·h/g恢复到820 mA·h/g, 显示出极佳的倍率性能.

关键词: 锂硫电池, 多壁碳纳米管, 羟基, 隔膜, 穿梭效应, 锂硫化物

Abstract:

Hydroxylated multi-walled carbon nanotube cellulose paper(MWCNTs-OHP) was obtained by vacuum filtration of hydroxylated multi-walled carbon nanotubes(MWCNTs-OH) and paper fibers. A multi-functional PP@MWCNTs-OHP@PP sandwich separator was formed by MWCNTs-OHP cellulose paper sandwiching between two polypropylene(PP) membranes and was used in lithium-sulfur battery. The morphology and structure of PP@MWCNTs-OHP@PP were characterized by transmission electron microscopy(TEM), scanning electron microscopy(SEM), infrared spectroscopy and energy dispersive spectroscopy(EDS). The electrochemical test showed that the initial discharge capacity of Li-S batteries with the PP@MWCNTs-OHP@PP sandwich separator reached to 1532 mA·h/g and the utilization rate of active substances reached 91.5%. The capacity still maintained 516 mA·h/g at 1C after 500 cycles with stabilized coulombic efficiency above 96.4% and slow capacity decay rate of 0.028% per cycle. As the charge-discharge rate decreased from 3C to 0.1C, the discharge capacity recovered from 336 mA·h/g to 820 mA·h/g, showing excellent magnification.

Key words: Lithium-sulphur battery, Multi-walled carbon nanotube, Hydroxyl, Separator, Shuttle effect, Lithium polysulfur

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