title: TiNb2O7 nanoparticles assembled into hierarchical microspheres as high-rate capability and long-cycle-life anode materials for lithium ion batteries.
abstract: As a competitor for Li4Ti5O12 with a higher capacity and extreme safety, monoclinic TiNb2O7 has been considered as a promising anode material for next-generation high power lithium ion batteries. However, TiNb2O7 suffers from low electronic conductivity and ionic conductivity, which restricts the electrochemical kinetics. Herein, a facile and advanced architecture design of hierarchical TiNb2O7 microspheres is successfully developed for large-scale preparation without any surfactant assistance. To the best of our knowledge, this is the first report on the one step solvothermal synthesis of TiNb2O7 microspheres with micro- and nano-scale composite structures. When evaluated as an anode material for lithium ion batteries, the electrode exhibits excellent high rate capacities and ultra-long cyclability, such as 258 mA h g(-1) at 1 C, 175 mA h g(-1) at 5 C, and 138 mA h g(-1) at 10 C, extending to more than 500 cycles.
authors.affiliation: Jiangsu Key Laboratory of Material and Technology for Energy Conversion, College of Materials Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao road, Nanjing, 210016, P. R. China. azhangxg@nuaa.edu.cn.
authors.forename: Hongsen
authors.initials: H
authors.lastname: Li
authors.forename: Laifa
authors.initials: L
authors.lastname: Shen
authors.forename: Gang
authors.initials: G
authors.lastname: Pang
authors.forename: Shan
authors.initials: S
authors.lastname: Fang
authors.forename: Haifeng
authors.initials: H
authors.lastname: Luo
authors.forename: Kai
authors.initials: K
authors.lastname: Yang
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Zhang