CTAB辅助电沉积V_2O_5薄膜及储锂性能研究-《电镀与精饰》

文章信息/Info

Title:: Preparation of V_2O_5 Films by CTAB Assisted Electrodeposition Method and Its Lithium Storage Performance

作者:: 李延伟; 蒙广伟; 姚金环; 朱文凤; 李世玉; 张灵志; 广西矿冶与环境科学实验中心桂林理工大学化学与生物工程学院;桂林理工大学有色金属及材料加工新技术教育部重点实验室

摘要:: 以五氧化二钒、双氧水和十六烷基三甲基溴化铵(CTAB)为原料,采用溶胶凝胶法制备了V2O5溶胶,并通过电沉积法在不锈钢基体上制备了正交晶系的V2O5薄膜电极材料。采用X-射线衍射和场发射扫描电子显微镜表征了V2O5薄膜材料的微观结构和表面形貌;采用循环伏安曲线、交流阻抗谱和充放电测试研究了V2O5薄膜作为锂离子电池正极材料的储锂性能。结果表明,在添加3%CTAB的V2O5溶胶中电沉积的V2O5薄膜比未添加CTAB的V2O5溶胶中电沉积的V2O5薄膜具有更高的电化学反应可逆性、更低的电化学反应阻抗、更好的嵌锂活性和倍率性能。

Abstract:: V2O5sol was prepared by sol-gel method with V2O5 powder,H2O2and CTAB as raw materials.Orthorhombic V2O5 thin films were fabricated by electrodeposition on stainless steel. Microstructure and surface morphology of the V2O5 thin films were characterized by X-ray diffraction( XRD) and Field Emission Scanning Electron Microscopy( FESEM). Lithium storage performance of the V2O5 thin films as cathode materials for lithium ion batteries was studied by cyclic voltammetry( CV),electrochemical impedance spectroscopy( EIS),and charge-discharge tests. The results demonstrated that the V2O5 thin films obtained from V2O5 sol with 3wt. % CTAB had higher electrochemical reaction reversibility,lower electrochemical reaction impedance,better lithium intercalation activity and rate performance.