Nitrogen-doped carbon-coated hierarchical Li4Ti5O12-TiO2 hybrid microspheres as excellent high rate anode of Li-ion battery

作者：Jiang, Chunhai^*; Liu, Shangbiao; Lian, Qinghuang; Zhao, Jing; Ding, Weiqiang; Yu, Zhiyang; Huang, Renzhong; Zou, Zhimin^*

来源：Ceramics International, 2017, 43(14): 11354-11360.

DOI：10.1016/j.ceramint.2017.05.341

• Li4Ti5O12
• Li-ion batteries
• Dual phase anode
• Carbon coating
• Rate capability

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 TiO2 microspheres in a stainless steel autoclave at 550 degrees 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(-1) were 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(-1) remained 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.

• 出版日期2017-10-1
• 单位厦门理工学院; 沈阳师范大学