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
姚德坤 1罗琴 1姜璐璇 1胡歆 1黎业生 1吴子平 1徐小明 2王海峰2
作者信息
- 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
- 折叠
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WCl6乙醇溶液,自然风干成膜后,将膜水热处理并煅烧即可得到WO2.9-W2N/CNTs复合膜.W2N可改善WO3的导电性,WO2.9与WO3比较,其氧缺陷可为Li2S沉积提供更多活性位点,WO2.9-W2N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WO2.9-W2N对电池电化学反应时的催化效果明显.
Abstract
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 WO2.9-W2N/CNTs composite film was obtained.The W2N can improve the poor conductivity of WO3.In addition,the oxygen vacancies of WO2.9 can provide more active sites for the deposition of Li2S than those of WO3.WO2.9-W2N 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 WO2.9-W2N/CNTs mainly occurs by trapping-anchoring-catalytic conversion.
关键词
碳纳米管/锂硫电池/催化转化/吸附锚定/活性位点Key words
carbon nanotube,lithium-sulfur,catalytic conversion,adsorption anchoring/active site引用本文复制引用
基金项目
国家自然科学基金(22179055)
江西省科技厅项目(JXSQ2019201037)
江西省科技厅项目(20212BDH81013)
出版年
2024
NETL
NSTL
万方数据