李天赐,李靖巍,戴梦嘉,许俊,刘家琴,张琪,吴玉程

• 1:合肥工业大学工业与装备技术研究院
• 2:合肥工业大学电子科学与应用物理学院
• 3:先进功能材料与器件安徽省重点实验室
• 4:合肥工业大学材料科学与工程学院

摘要(Abstract)：

采用阳极氧化法制备TiO_2纳米管阵列薄膜(TNTAs),在不同热处理温度下对其进行晶化处理,然后采用电化学氢化法对TNTAs实施氢化改性,获得导电性显著提高的H-TNTAs。利用场发射扫描电镜、X射线衍射、X射线光电子能谱、显微共焦激光拉曼光谱研究了晶化温度对TNTAs和H-TNTAs微观结构的影响,利用电池测试系统,探究晶化温度对TNTAs和H-TNTAs作为锂电负极的电化学性能影响。结果表明:当晶化温度从400℃升高至700℃时,非晶TiO_2逐渐晶化为锐钛矿相,在600℃时发生锐钛矿向晶红石相转变,700℃时管状结构发生破坏;随着晶化温度的升高,TNTAs电极的比容量不断降低;氢化改性后HTNTAs的比容量和倍率特性均有提升,但是不同晶化温度的H-TNTAs比容量和倍率特性提升幅度不一,主要是由于氢化时引入的Ti~(3+)在不同晶体结构TiO_2中浓度和稳定性不同,其中晶化温度为500℃时,单一锐钛矿相、结晶良好的H-TNTAs-500的电化学性能最优,比容量和倍率特性提升最为显著。

关键词(KeyWords)： 晶化温度;TiO2纳米管阵列;氢化;微观结构;储锂性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51402078);; 合肥工业大学学术新人提升计划B项目(JZ2016HGTB0711);; 安徽省有色金属材料与加工工程实验室青年学术团队能力提升计划项目(HFUT-AZ-2017-035-1)

作者(Author): 李天赐,李靖巍,戴梦嘉,许俊,刘家琴,张琪,吴玉程

DOI: 10.13289/j.issn.1009-6264.2018-0066

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