Electrospun TiO2鈥揋raphene Composite Nanofibers as a Highly Durable Insertion Anode for Lithium Ion Batteries

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• 作者：Xiang Zhang ; Palaniswamy Suresh Kumar ; Vanchiappan Aravindan ; Hui Hui Liu ; Jayaraman Sundaramurthy ; Subodh G. Mhaisalkar ; Hai Minh Duong ; Seeram Ramakrishna ; Srinivasan Madhavi
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：July 19, 2012
• 年：2012
• 卷：116
• 期：28
• 页码：14780-14788
• 全文大小：711K
• 年卷期：v.116,no.28(July 19, 2012)
• ISSN：1932-7455

文摘

We report the synthesis and electrochemical performance of one-dimensional TiO₂鈥揼raphene composite nanofibers (TiO₂鈥揋 nanofibers) by a simple electrospinning technique for the first time. Structural and morphological properties were characterized by various techniques, such as X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and BET surface area analysis. Lithium insertion properties were evaluated by both galvanostatic and potentiostatic modes in half-cell configurations. Cyclic voltammetric study reveals the Li-insertion/extraction by a two-phase reaction mechanism that is supported by galvanostatic charge鈥揹ischarge profiles. Li/TiO₂鈥揋 half-cells showed an initial discharge capacity of 260 mA h g^鈥? at current density of 33 mA g^鈥?. Further, Li/TiO₂鈥揋 cell retained 84% of reversible capacity after 300 cycles at a current density of 150 mA g^鈥?, which is 25% higher than bare TiO₂ nanofibers under the same test conditions. The cell also exhibits promising high rate behavior with a discharge capacity of 71 mA h g^鈥? at a current density of 1.8 A g^鈥?.