Chemically Lithiated TiO2 Heterostructured Nanosheet Anode with Excellent Rate Capability and Long Cycle Life for High-Performance Lithium-Ion Batteries

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• 作者：Muhammad-Sadeeq Balogun ; Yikun Zhu ; Weitao Qiu ; Yang Luo ; Yongchao Huang ; Chaolun Liang ; Xihong Lu ; Yexiang Tong
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 25, 2015
• 年：2015
• 卷：7
• 期：46
• 页码：25991-26003
• 全文大小：874K
• ISSN：1944-8252

文摘

A new form of dual-phase heterostructured nanosheet comprised of oxygen-deficient TiO<sub>2sub>/Li<sub>4sub>Ti<sub>5sub>O<sub>12sub> has been successfully synthesized and used as anode material for lithium ion batteries. With the three-dimensional (3D) Ti mesh as both the conducting substrate and the Ti<sup>3+sup>/Ti<sup>4+sup> source, blue anatase Ti<sup>3+sup>/TiO<sub>2sub>nanosheets were grown by a hydrothermal reaction. By controlling the chemical lithiation period of TiO<sub>2sub> nanosheets, a phase boundary was created between the TiO<sub>2sub> and the newly formed Li<sub>4sub>Ti<sub>5sub>O<sub>12sub>, which contribute additional capacity benefiting from favorable charge separation between the two phase interfaces. Through further hydrogenation of the 3D TiO<sub>2sub>/Li<sub>4sub>Ti<sub>5sub>O<sub>12sub> heterostructured nanosheets (denoted as H-TiO<sub>2sub>/LTO HNS), an extraordinary rate performance with capacity of 174 mAh g<sup>鈥?sup> at 200 C and outstanding long-term cycling stability with only an 鈭?% decrease of its initial specific capacity after 6000 cycles were delivered. The heterostructured nanosheet morphology provides a short length of lithium diffusion and high electrode/electrolyte contact area, which could also explain the remarkable lithium storage performance. In addition, the full battery assembled based on the H-TiO<sub>2sub>/LTO anode achieves high energy and power densities.