Electrospun TiO2/C Nanofibers As a High-Capacity and Cycle-Stable Anode for Sodium-Ion Batteries

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• 作者：Ya Xiong ; Jiangfeng Qian ; Yuliang Cao ; Xinping Ai ; Hanxi Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 6, 2016
• 年：2016
• 卷：8
• 期：26
• 页码：16684-16689
• 全文大小：347K
• 年卷期：0
• ISSN：1944-8252

文摘

Nanosized TiO₂ is now actively developed as a low-cost and potentially high capacity anode material of Na-ion batteries, but its poor capacity utilization and insufficient cyclability remains an obstacle for battery applications. To overcome these drawbacks, we synthesized electrospun TiO₂/C nanofibers, where anatase TiO₂ nanocrystals with a diameter of ∼12 nm were densely embedded in the conductive carbon fibers, thus preventing them from aggregating and attacking by electrolyte. Due to its abundant active surfaces of well-dispersed TiO₂ nanocrytals and high electronic conductivity of the carbon matrix, the TiO₂/C anode shows a high redox capacity of ∼302.4 mA h g^–1 and a high-rate capability of 164.9 mAh g^–1 at a very high current of 2000 mA g^–1. More significantly, this TiO₂/C anode can be cycled with nearly 100% capacity retention over 1000 cycles, showing a sufficiently long cycle life for battery applications. The nanofibrous architecture of the TiO₂/C composite and its superior electrochemical performance may provide new insights for development of better host materials for practical Na-ion batteries.