Synthesis of TiNb₆O₁₇/C composite with enhanced rate capability for lithium ion batteries

详细信息    查看全文

• 作者：Wutao Mao ; Keyan Bao ; ^{baokeyan@126.com" class="auth_mail" title="E-mail the corresponding author} ; Lin Wang ; Guangyin Liu ; ^{liugy13@163.com" class="auth_mail" title="E-mail the corresponding author} ; Haiquan Xie ; Ruixue Zhang ; Shaolong Zheng ; Jiali Guo ; Beibei Li ; Weibo Wang
• 关键词：Lithium ion battery ; TiNb6O17/C composite ; Solid-state reaction ; Electrochemical property
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 November 2016
• 年：2016
• 卷：42
• 期：15
• 页码：16935-16940
• 全文大小：1819 K

文摘

TiNb₆O₁₇/C composites were obtained via a facile solid-state reaction with TiO₂, Nb₂O₅ and glucose as the starting materials. The lattice structure and morphology of the composite were investigated by X-ray diffraction, scanning electronic microscopy and transmission electron microscopy. The electrochemical properties were characterized by rate charge/discharge measurements and cyclic voltammetry. Electrochemical measurements demonstrate that the TiNb₆O₁₇/C composite exhibits electrochemical properties superior to those of pure TiNb₆O₁₇, especially at high current rates. The initial discharge capacities of TiNb₆O₁₇/C are 239, 225.1 and 199.8 mAh g⁻¹ at 1, 5 and 10 C, respectively. Even after 500 cycles at 10 C, the capacity still remains 165.1 mAh g⁻¹, while the capacity of TiNb₆O₁₇ is only 74.8 mAh g⁻¹. The excellent electrochemical performance of TiNb₆O₁₇/C is attributed to the improvement of the electrical conductivity resulting from carbon coating.