Ultrathin TiO2-B nanowires with enhanced electrochemical performance for Li-ion batteries

作者：Lan, Tongbin; Dou, Jie; Xie, Fengyan; Xiong, Peixun; Wei, Mingdeng^*

来源：Journal of Materials Chemistry A, 2015, 3(18): 10038-10044.

DOI：10.1039/c5ta01061f

• RECHARGEABLE LITHIUM BATTERIES
• HYBRID NANOSTRUCTURES
• TIO2(B) NANORIBBONS
• ENERGY-STORAGE
• ANODE MATERIAL
• ELECTRODES
• COMPOSITES
• CHALLENGES
• NANOSHEETS

A facile one-step hydrothermal route was designed for preparing ultrathin TiO2-B nanowires, which were then hybridized with RGO to form a TiO2-B/RGO hybrid via an in situ approach, and both of them have a large BET surface area (231.6 m(2) g(-1) for TiO2-B nanowires and 256.1 m(2) g(-1) for the TiO2-B/RGO hybrid). It was found that the synthesized ultrathin nanowires are perpendicular to the [010] direction which is the most open channel in the TiO2-B crystal structure, demonstrating more Li-ion insertion/extraction hosts exposed to the electrolyte. Thus, the cell made of TiO2-B ultrathin nanowires exhibited large reversible lithium-ion charge-discharge capacity, excellent cycling stability and high-rate capability. When combined with RGO, the formed TiO2-B/RGO hybrid exhibited further improved Li storage performance. For instance, a capacity of 205.3 mA h g(-1) was obtained at the fourth cycle and then faded slightly to 189.4 mA h g(-1) after 300 cycles, demonstrating a surprising low average capacity fading of ca. 0.026% per cycle from 4th to 300th cycles.

• 出版日期2015
• 单位福州大学