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Na2Ti3O7纳米片原位制备与钠离子电池负极材料应用(英文)

In-situ Preparation of Na2Ti3O7 Nanosheets as High-Performance Anodes for Sodium Ion Batteries

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【作者】 陈程成张宁刘永畅王一菁陈军

【Author】 CHEN Cheng-Cheng;ZHANG Ning;LIU Yong-Chang;WANG Yi-Jing;CHEN Jun;Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University;Collaborative Innovation Center of Chemical Science and Engineering,Nankai University;

【机构】 南开大学化学学院先进能源材料教育部重点实验室南开大学天津化学化工协同创新中心

【摘要】 报道了Na2Ti3O7纳米片的原位生长和钠离子电池负极材料的应用。通过简单的腐蚀市售的钛片制备出相互连接的微纳结构的Na2Ti3O7纳米片。此外,腐蚀后的钦片在不用添加导电剂或粘结剂的情况下,可以直接作为电极材料使用。这种电极材料表现出优越的电化学性能,在50 mA·g-1的电流密度下具有175mAh·g-1的可逆容量,在2000mA·g-1的电流密度下循环3000周后,其容量仍保持120 mAh·g-1,容量保持率为96.5%。Na2Ti3O7纳米片电极的优越电化学性能归因于二维结构具有较短的离子/电子扩散路径以及无粘结剂结构能有效的增加电极的电子传导能力。结果表明,这种微纳结构能够有效地克服Na2Ti3O7作为电极材料离子/电子导电性差的缺点。因此,这种无粘结剂结构的Na2Ti3O7纳米片负极材料是一种很有潜力的钠离子负极材料。

【Abstract】 We report on the in-situ preparation of Na2Ti3O7 nanosheets and their application as highperformance anode material for sodium ion batteries.Nanosheets with interconnected micro-nano architectures are prepared by simply engraving commercial titanium foils.Furthermore,the foils can be used directly as electrodes without redundant conductive additives or binders.The electrode material exhibits excellent electrochemical performance with reversible capacity of 175 mAh·g-1 at 50 mA·g-1 and120 mAh·g-1 at 2000 mA·g-1 after 3000 cycles(capacity retention of 96.5%).The superior electrochemical performance of Na2Ti3O7 nanosheets results from the short ion/electron diffusion pathway of the twodimensional architecture and the good conductive capability of the binder-free structure.The anode of the binder-free Na2Ti3O7 nanosheets effectively overcomes poor ion/electron conductivity,the main drawback of Na2Ti3O7 electrodes,and is promising for rechargeable sodium ion batteries.

【基金】 supported by the National Natural Science Foundation of China(51231003,21231005);Ministry of Education(B12015,113016A,ACET-13-0296)~~
  • 【文献出处】 物理化学学报 ,Acta Physico-Chimica Sinica , 编辑部邮箱 ,2016年01期
  • 【分类号】TB383.1;TM912
  • 【被引频次】12
  • 【下载频次】517
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