Effect of Mo⁶⁺ doping on electrochemical performance of anatase TiO₂ as a high performance anode material for secondary lithium-ion batteries

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• 作者：Trang Vu Thi¹ ; Alok Kumar Rai¹ ; Jihyeon Gim ; Sungjin Kim ; Jaekook Kim ; ^{jaekook@chonnam.ac.kr" class="auth_mail}
• 关键词：Titanium dioxide ; Molybdenum ; Semiconductor ; Anode ; Lithium-ion batteries
• 刊名：Journal of Alloys and Compounds
• 出版年：15 June, 2014
• 年：2014
• 卷：598
• 期：Complete
• 页码：16-22
• 全文大小：1943 K

文摘

The effects of molybdenum (Mo⁶⁺) doping on the electrochemical properties of anatase-type titanium dioxide (TiO₂) were investigated. The Mo⁶⁺-doped TiO₂ samples were prepared using a simple and cost-effective solvothermal method with the doping levels of 1, 3, and 5 wt%, followed by annealing at a low temperature of 300 掳C for 5 h. High-resolution synchrotron X-ray diffraction and electron microscopy were conducted to know the structural and morphological properties of doped TiO₂ samples. The dopant significantly suppresses the growth of TiO₂ grains and reduces the particles sizes, which can also improve markedly the performance and stability of charge/discharge cycles. The particles sizes are in the range of 115-250 nm and 5-10 nm for undoped and Mo-doped TiO₂ nanoparticle samples, respectively. Electrochemical results show that the Mo⁶⁺-doped TiO₂ nanoparticle samples display a significantly lower charge transfer resistance, higher rate capability and excellent reversibility. Author鈥檚 believed that the high rate performance offered by Mo-doped TiO₂ nanoparticle electrodes may be attributed to the enhanced electronic and ionic conductivity, which are achieved by increasing the number of Ti⁴⁺ vacancies in the lattice via Mo⁶⁺ doping, which may lead to the generation of more free holes in the doped p-type semiconductor. The increased hole concentration in the valence band can contribute to the electrical conductivity of the doped sample.