首页|Flower-like TiO2 hollow microspheres with mixed-phases for high-pseudocapacitive lithium storage
Flower-like TiO2 hollow microspheres with mixed-phases for high-pseudocapacitive lithium storage
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NSTL
Elsevier
Titanium dioxide (TiO2) is a typical lithium-ion storage material with the advantages of stable structure, abundant source and easy preparation. To further improve the lithium-ion diffusion, we employ a sol-gel method with a silicon dioxide (SiO2) template to prepare flower-like TiO2 hollow microspheres (TiO2 HM) with a loose surface structure composed of nanosheets. The as-prepared TiO2 exhibits a large specific surface area (120.3 m2/g) and pore volume (0.13 cm3/g), which favors the penetration of electrolyte. Moreover, the TiO2(B)/anatase/amorphous mixed phases have multitudes active sites for rapid lithium-ion diffusion. As an anode for lithium-ion batteries (LIBs), TiO2 HM deliver a high first discharge specific capacity (721 mAh/g, 0.1 A/g), superior rate capacity (84 mAh/g, 2.0 A/g) and long life (121 mAh/g, 1000 cycles, 1.0 A/g). Electrochemical analysis proves that Li+ ions storage of TiO2 HM is mainly dependent on pseudocapacitance (87%, 2.0 A/g). Therefore, it is an effective way to regulate morphology, composition and pseudocapacitance property with the SiO2 template of TiO2 for promising LIB anodes.
School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials Institute of Frontier Science and Technology Transfer Shaanxi University of Science and Technology
NSTL
Elsevier
