电化学沉积制备V2O5薄膜电极的表面结构及储钠性能  

Surface morphology and sodium storage performance of V_2O_5 thin film electrode prepared by CTAB assisted electrodeposition

作　　者：李延伟[1,2] 李世玉[1] 谢志平[1] 姚金环[1] 姜吉琼[1] 张灵志[2] 

机构地区：[1]广西电磁化学功能物质重点实验室,桂林理工大学化学与生物工程学院,广西桂林541004 [2]中国科学院可再生能源重点实验室,广东广州510640

出　　处：《化工学报》2016年第11期4771-4778,共8页CIESC Journal

基　　金：国家自然科学基金项目(21263003,51664012,51464009);广西自然科学基金项目(2015GXNSFGA139006,2014GXNSFBA118238);中国科学院可再生能源重点实验室资助项目(y507k61001)~~

摘　　要：以含有CTAB的V_2O_5溶胶为电解液,采用电沉积法在不锈钢基体上沉积V_2O_5薄膜前体,经300℃烧结处理后制备了无黏结剂和导电剂的V_2O_5纳米薄膜电极。XRD测试表明该方法制备的V_2O_5薄膜是含水相的V_2O_5·n H2O,与未添加CTAB制备的薄膜相比,其层间距明显变大。FESEM和AFM测试发现CTAB辅助电沉积制备的V_2O_5薄膜具有粗糙多孔的表面形貌;XPS测试表明CTAB辅助电沉积制备的V_2O_5薄膜中含有更多的低价钒离子(V4+)。电化学测试发现该方法制备的V_2O_5薄膜具有优异的嵌/脱Na+循环稳定性;与未添加CTAB制备的薄膜相比,CTAB辅助电沉积制备的V_2O_5薄膜具有更好的电化学反应可逆性、更强Na+扩散性能和更高的储钠比容量,是一种非常有应用前景的钠离子电池正极材料。New V2O5 nanofilm electrodes without binder and conductive agents were fabricated by sintering the V2O5 film precursor at 300℃ on stainless steel substrates, which were coated from CTAB-containing V2O5 sol gel electrolyte by electrodeposition. X-Ray diffraction（XRD） indicated that V2O5 in the new V2O5 film was hydrated V2O5·n H2 O and the film had lager interlamellar spacing than V_2O_5 film prepared without CTAB. Field emission scanning electron microscopy（FESEM） and atomic force microscopy（AFM） results showed that the new V2O5 film possessed a rough porous surface morphology. X-Ray photoelectron spectroscopy（XPS） results suggested that the new V2O5 film electrode contained more V4＋ than the V2O5 film electrode prepared without CTAB. Electrochemical study demonstrated that the new V2O5 film electrode had excellent Na＋insertion/extraction stability. Compared to the V2O5 film electrode prepared without CTAB, the new V2O5 film electrode exhibited better electrochemical reaction reversibility, enhanced Na＋ diffusion performance, and higher sodium storage specific capacity, which could be a very promising cathode material for sodium ion batteries.

关 键 词：钠离子电池 正极材料 制备 电化学 纳米材料 

分 类 号：TB43[一般工业技术]