Sodium Titanate/Carbon (Na₂Ti₃O₇/C) Nanofibers via Electrospinning Technique as the Anode of Sodium-ion Batteries

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• 作者：Wei Zou ; Cong Fan and Jingze Li
• 刊名：Chinese Journal of Chemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：35
• 期：1
• 页码：79-85
• 全文大小：2372K
• ISSN：1614-7065

文摘

To overcome the sluggish kinetics in sodium-ion batteries, sodium titanate/carbon (Na₂Ti₃O₇/C) composite nanofibers as anode materials have successfully been synthesized via a simple electrospinning method. After calcination at 800 °C for 3 h, the obtained Na₂Ti₃O₇ nanoparticles are randomly dispersed in the matrix of in situ pyrolized carbon nanofiber. The Na₂Ti₃O₇/C hybrid nanofiber obtained with 2.5 wt% of poly (vinylpyrrolidone) additive in the precursor solution has the smallest diameter of ~120 nm and the finest particle size of ~40 nm, exhibiting the best rate performance of 101 mAh•g⁻¹ at 4 C and excellent capacity retention of 82% at 1 C after 100 cycles. Furthermore, this composite nanofiber also demonstrates good cycling performance under low current density of 0.1 C, which is attributed to the formation of stable solid electrolyte interface (SEI) film induced by small volume expansion/contraction of the fine Na₂Ti₃O₇ nanoparticles during the charge/discharge process.