Preparation and Li+Intercalation/Deintercalation Performance of Spherical TiNb2O7 by Solid-Phase Method
The precursor of spherical TiNb2O7 was prepared by wet grinding process and spray drying process.The TiNb2O7 materials were synthesized by the solid-phase method and characterized by XRD,SEM and electrochemical tests.The results showed that the TiNb2O7 materials were secondary particles composed of primary particles with an average size of about 4-6 μm and numerous pores inside.The TiNb2O7 materials exhibited a high initial specific discharge capacity of 316.5 mA·h/g at 0.1 C rate in 0.8-3.0 V with an initial Coulombic efficiency of 99.7%.Furthermore,TiNb2O7 had a good rate capacity,which still reached 82.0%after 100 cycles at 1 C,and had a specific discharge capacity of 234.7 mA·h/g at 10 C.
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