Copper-Doped Titanium Dioxide Bronze Nanowires with Superior High Rate Capability for Lithium Ion Batteries

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• 作者：Yongquan Zhang ; Yuan Meng ; Kai Zhu ; Hailong Qiu ; Yanming Ju ; Yu Gao ; Fei Du ; Bo Zou ; Gang Chen ; Yingjin Wei
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 30, 2016
• 年：2016
• 卷：8
• 期：12
• 页码：7957-7965
• 全文大小：651K
• ISSN：1944-8252

文摘

Pristine and Cu-doped TiO₂–B nanowires are synthesized by the microwave assisted hydrothermal method. The doped oxide exhibits a highly porous structure with a specific surface area of 160.7 m² g^–1. As evidenced by X-ray photoelectron spectroscopy and X-ray energy dispersive spectroscopy, around 2.0 atom % Cu²⁺ cations are introduced into TiO₂–B, which leads to not only a slightly expanded lattice network but also, more importantly, a modified electronic structure. The band gap of TiO₂–B is reduced from 2.94 to 2.55 eV, resulting in enhanced electronic conductivity. Cyclic voltammetry and electrochemical impedance spectroscopy reveal improved electrochemical kinetic properties of TiO₂–B due to the Cu doping. The doped nanowires show a specific capacity of 186.8 mAh g^–1 at the 10 C rate with a capacity retention of 64.3% after 2000 cycles. Remarkably, our material exhibits a specific capacity of 150 mAh g^–1 at the 60 C rate, substantiating its superior high rate capability for rechargeable lithium batteries.