New Approach to Create TiO2(B)/Carbon Core/Shell Nanotubes: Ideal Structure for Enhanced Lithium Ion Storage

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• 作者：Xiaoyi Zhu ; Xianfeng Yang ; Chunxiao Lv ; Shaojun Guo ; Jianjiang Li ; Zhanfeng Zheng ; Huaiyong Zhu ; Dongjiang Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：8
• 期：29
• 页码：18815-18821
• 全文大小：457K
• 年卷期：0
• ISSN：1944-8252

文摘

To achieve uniform carbon coating on TiO₂ nanomaterials, high temperature (>500 °C) annealing treatment is a necessity. However, the annealing treatment inevitably leads to the strong phase transformation from TiO₂(B) with high lithium ion storage (LIS) capacity to anatase with low LIS one as well as the damage of nanostructures. Herein, we demonstrate a new approach to create TiO₂(B)/carbon core/shell nanotubes (C@TBNTs) using a long-chain silane polymethylhydrosiloxane (PMHS) to bind the TBNTs by forming Si–O–Ti bonds. The key feature of this work is that the introduction of PMHS onto TBNTs can afford TBNTs with very high thermal stability at higher than 700 °C and inhibit the phase transformation from TiO₂(B) to anatase. Such a high thermal property of PMHS-TBNTs makes them easily coated with highly graphitic carbon shell via CVD process at 700 °C. The as-prepared C@TBNTs deliver outstanding rate capability and electrochemical stability, i.e., reversible capacity above 250 mAh g^–1 at 10 C and a high specific capacity of 479.2 mAh g^–1 after 1000 cycles at 1 C. As far as we know, the LIS performance of our sample is the highest among the previously reported TiO₂(B) anode materials.