高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (7): 1661-1669.doi: 10.7503/cjcu20200057

• 物理化学 • 上一篇    下一篇

氧缺位结构介孔二氧化钛/聚乙烯复合隔膜在锂硫电池中的应用

吴桐,丛丽娜,孙立群,谢海明*()   

  1. 东北师范大学化学学院, 动力电池与地方联合工程实验室, 吉林省锂离子电池材料科技创新中心, 长春 130024
  • 收稿日期:2020-02-05 出版日期:2020-07-10 发布日期:2020-04-08
  • 通讯作者: 谢海明 E-mail:xiehm136@nenu.edu.cn
  • 基金资助:
    吉林省重点技术研发专项资金(2018201097GX);国家自然科学基金青年科学基金(21905041);国家自然科学基金青年科学基金(2018M640274);中国博士后科学基金(JJKH20190265KJ);吉林省教育厅自然科学基金(2412020ZD002);吉林省教育厅自然科学基金(2412018QD006);中央高校基础研究基金(2019C042)

Application of Porous Black Titanium Dioxide with Oxygen Vacancy/Polyethylene as a Composite Separator for Lithium Sulfur Batteries

WU Tong,CONG Lina,SUN Liqun,XIE Haiming*()   

  1. Faculty of Chemistry, National and Local United Engineering Laboratory for Power Batteries, Jilin Province Lithium Ion Battery Material Science and Technology Innovation Center, Northeast Normal University, Changchun 130024, China
  • Received:2020-02-05 Online:2020-07-10 Published:2020-04-08
  • Contact: Haiming XIE E-mail:xiehm136@nenu.edu.cn
  • Supported by:
    † Special Fund of Key Technology Research and Development Projects of Jilin Province, China(2018201097GX);National Natural Science Foundation of China(21905041);Postdoctoral Science Foundation of China(2018M640274);Natural Science Foundation of the Jilin Province, China(JJKH20190265KJ);Fundamental Research Funds for the Cental Universities, China(2412020ZD002);Fundamental Research Funds for the Cental Universities, China(2412018QD006);Special Foundation of Industrial Technology Research and Development of Education department of Jilin Province, China(2019C042)

摘要:

采用两步溶液法合成了一种具有高度氧缺位的黑色介孔二氧化钛, 并将其涂覆在隔膜表面作为锂硫电池复合隔膜, 研究了其在锂硫电池中的电化学性能. 结果表明, 氧缺位的黑色介孔二氧化钛材料不仅展现出良好的导电性, 还能加强对多硫化物的物理和化学吸附能力, 从而显著提高锂硫电池的放电比容量(0.1C倍率下首次放电比容量为1257 mA·h/g)和循环性能(循环100次后放电比容量为821 mA·h/g).

关键词: 锂硫电池, 复合隔膜, 二氧化钛, 多硫化物, 循环性能

Abstract:

In this work, a mesoporous black titanium dioxide(b-TiO2) with highly ordered oxygen vacancy was synthesized by two-step solution method and coated on the surface of polyethylene separator to obtain the composite separator for lithium-sulfur(Li-S) battery. The electrochemical performance of the Li-S battery with this composite separator was studied. The results show that the mesoporous b-TiO2 presents a good conductivity due to oxygen vacancy, and can enhance the physical and chemical adsorption of polysulfide, thus the obtained Li-S batteries possess excellent discharge specific capacities(1257 mA·h/g at 0.1C) and outstan-ding cycling performance(discharge specific capacity 821 mA·h/g after 100 cycles).

Key words: Lithium-sulfur battery, Composite separator, Titanium dioxide, Polysulfide, Cycling performance

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