导电氮化物改性氧化钨催化剂对锂硫电池电化学性能的影响  

Effect of Conductive Nitride-Modified Tungsten Oxide Catalyst on Electrochemical Performance of Lithium-Sulfur Batteries

作　　者：姚德坤 罗琴 姜璐璇 胡歆 黎业生 吴子平 徐小明 王海峰 Yao Dekun;Luo Qin;Jiang Luxuan;Hu Xin;Li Yesheng;Wu Ziping;Xu Xiaoming;Wang Haifeng(School of Materials Science and Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Jiangxi Anchi New Energy Technology Co.,Ltd,Shangrao 334113,China)

机构地区：[1]江西理工大学材料科学与工程学院,江西赣州341000 [2]江西安驰新能源科技有限公司,江西上饶334113

出　　处：《稀有金属材料与工程》2024年第8期2285-2292,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(22179055);江西省科技厅项目(JXSQ2019201037,20212BDH81013)。

摘　　要：通过浮动催化CVD法在制备碳纳米管(CNTs)堆叠成膜过程中喷洒前驱体WCl_(6)乙醇溶液,自然风干成膜后,将膜水热处理并煅烧即可得到WO_(2.9)-W_(2)N/CNTs复合膜。W_(2)N可改善WO_(3)的导电性,WO_(2.9)与WO_(3)比较,其氧缺陷可为Li_(2)S沉积提供更多活性位点,WO_(2.9)-W_(2)N还可与多硫化物(LiPSs)形成Li-O、Li-N键,使基体对LiPSs的化学吸附与锚定增强。以复合膜为正极的锂硫电池在0.2 C倍率下500次循环后,放电比容量依然保持大于850 mAh·g^(-1),说明合成的WO_(2.9)-W_(2)N对电池电化学反应时的催化效果明显。During the preparation of carbon nanotube films(CNTs),the precursor WCl6 alcohol solution was sprayed by floating catalyst CVD,and then a film was formed by natural drying;subsequently the film was hydrothermal treated and calcined;finally a WO_(2.9)-W_(2)N/CNTs composite film was obtained.The W_(2)N can improve the poor conductivity of WO_(3).In addition,the oxygen vacancies of WO_(2.9)can provide more active sites for the deposition of Li_(2)S than those of WO_(3).WO_(2.9)-W_(2)N can form Li-O bond and Li-N bond with polysulfides(LiPSs);as a result,the chemical adsorption and anchoring of LiPSs onto the matrix is strengthened.The prepared lithium-sulfur battery with the composite film as anode possesses excellent electrochemical performances;after 500 cycles at a rate of 0.2 C,its discharge specific capacity remains above 850 mAh·g^(-1).It is demonstrated excellent electrochemical reaction kinetics and its catalytic effect to the electrochemical reactions.The shuttling inhibition of WO_(2.9)-W_(2)N/CNTs mainly occurs by trapping-anchoringcatalytic conversion.

关 键 词：碳纳米管 锂硫电池 催化转化 吸附锚定 活性位点 

分 类 号：TM911[电气工程—电力电子与电力传动]