The study on structure and electrochemical sodiation of one-dimensional nanocrystalline TiO2@C nanofiber composites. (10th September 2015)

• Record Type: Journal Article
• Authors: Ge, Yeqian; Zhu, Jiadeng; Lu, Yao; Chen, Chen; Qiu, Yiping; Zhang, Xiangwu
• Is Part Of: Electrochimica acta. Volume 176(2015)
• Page Start: 989
• Page End: 996
• Publication Date: 2015-09-10
• Subjects: Titanium dioxide -- Carbon nanofiber -- Electrospinning -- Sodium-ion batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.07.105
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Novel one-dimensional TiO2 @CNF composites were used as anode in sodium-ion batteries. TiO2 nanocrystals were uniformly embeded in the carbon nanofiber composites. Effects of anatase and rutile TiO2 phases on the performance of TiO2 @CNF were studied. Good cycling and rate performance of TiO2 @CNF composites were obtained. Abstract: Titanium dioxide (TiO2 ) is a prospective anode candidate for sodium-ion batteries, owing to the advantages of good chemical stability, elemental abundance and nontoxicity. In this work, TiO2 embedded in carbon nanofiber (TiO2 @CNF) composites are prepared for high-performance sodium-ion batteries by electrospinning and subsequent heat treatment in N2 at different temperatures. With increase in heat-treatment temperature, the diameter of nanofibers decreases and the crystal phase partially transforms from anatase to rutile. Among all composites, the TiO2 @CNF composite treated at 550 °C has anatase structure and exhibits the highest initial reversible capacity (237.3 mAh g −1 ), largest initial coulombic efficiency (68.2%), and superior capacity retention (100.3%) over 100 cycles at 30 mA g −1 . Whereas, the TiO2 @CNF composite treated at 650 °C is 28.23% rutile and 71.77% anatase, and shows the best rate capability of 159.1 mAh g −1 even at current density of 800 mA g −1 . It is, therefore, demonstrated that TiO2 @CNF composites prepared with appropriate conditions are superior anode material for sodium-ion batteries.