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  

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

作　　者：吴桐 丛丽娜[1] 孙立群[1] 谢海明[1] WU Tong;CONG Lina;SUN Liqun;XIE Haiming(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)

机构地区：[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

出　　处：《高等学校化学学报》2020年第7期1661-1669,共9页Chemical Journal of Chinese Universities

基　　金：吉林省重点技术研发专项资金(批准号:20180201097GX);国家自然科学基金青年科学基金(批准号:21905041);中国博士后科学基金(批准号:2018M640274);吉林省教育厅自然科学基金(批准号:JJKH20190265KJ);中央高校基础研究基金(批准号:2412020ZD002,2412018QD006);吉林省产业技术研究与开发专项项目(批准号:2019C042)资助.

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 m A·h/g)和循环性能(循环100次后放电比容量为821 m A·h/g).In this work,a mesoporous black titanium dioxide(b-TiO 2)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-TiO 2 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).

关 键 词：锂硫电池 复合隔膜 二氧化钛 多硫化物 循环性能 

分 类 号：O646[理学—物理化学]