Nitrogen-doped carbon-coated hierarchical Li4Ti5O12-TiO2 hybrid microspheres as excellent high rate anode of Li-ion battery
Nitrogen-doped carbon-coated hierarchical Li4Ti5O12-TiO2 hybrid microspheres as excellent high rate anode of Li-ion battery
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DOI：
10.1016/j.ceramint.2017.05.341
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发表时间：
2017-10
影响因子：
5.2
通讯作者：
Chunhai Jiang;Shangbiao Liu;Qinghuang Lian;J. Zhao;W. Ding;Zhiyang Yu;Renzhong Huang;Zhimin Zou-Zhimi
中科院分区：
文献类型：
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作者：
Chunhai Jiang;Shangbiao Liu;Qinghuang Lian;J. Zhao;W. Ding;Zhiyang Yu;Renzhong Huang;Zhimin Zou-Zhimi
将尿素和化学锂化的蒲公英样tio2微球的干燥混合物在不锈钢高压灭菌器中550℃热处理5 h，制备了掺杂氮碳包覆Li4Ti5O12-TiO2（LTO-TO）杂化微球，并将其作为锂离子电池的负极进行了测试。与原始样品相比，n掺杂碳包覆的LTO-TO微球在低电流和高电流下都表现出更高的比容量。在0.2℃和20℃下分别获得了184 mAh和123 mAh g−1的放电容量。此外，LTO-TO/C电极表现出优异的循环性能，在5℃下循环300次后，放电容量保持在121.3 mAh g−1，平均每循环容量衰减率为0.073%。这些高比容量、优异的倍率性能和循环性能证明了n掺杂碳包覆LTO-TO微球作为储能型和动力型锂离子电池负极材料的巨大潜力。
Nitrogen-doped carbon-coated Li4Ti5O12-TiO2(LTO-TO) hybrid microspheres were prepared by heat treating the dry mixture of urea and chemically lithiated dandelion-like TiO2microspheres in a stainless steel autoclave at 550 °C for 5 h. The hybrid materials were tested as anode of Li-ion batteries. As compared to the pristine sample, the N-doped carbon-coated LTO-TO microspheres exhibited higher specific capacity at both low and high current rates. Discharge capacities of 184 and 123 mAh g−1were obtained at 0.2 C and 20 C, respectively. Moreover, the LTO-TO/C electrode showed excellent cycle performance, with a discharge capacity of 121.3 mAh g−1remained after 300 cycles at 5 C, corresponding to an average capacity degradation rate of 0.073% per cycle. These high specific capacity, excellent rate capability and cycle performance demonstrated the high potentiality of the N-doped carbon-coated LTO-TO microspheres as anode material of both energy storage-type and power-type Li-ion batteries.