Template-free synthesis of mesoporous succulents-like TiO <inf>2</inf> /graphene aerogel composites for lithium-ion batteries
Authors: Cheng, L., Qiao, D., Zhao, P., He, Y., Sun, W., Yu, H. and Jiao, Z.
Journal: Electrochimica Acta
Volume: 300
Pages: 417-425
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2019.01.133
Abstract:Mesoporous succulents-like titanium dioxide (TiO 2 )/graphene aerogel (GA) composites are synthesized through a facile template-free method. The growth mechanism of the composites has been studied, which can be attributed to the Ostwald ripening mechanism. The succulents-like TiO 2 submicron flowers grow in situ on the surface of GA. Moreover, they show a unique mesoporous structure. Due to the synergistic interaction of unique mesoporous succulents-like structure of TiO 2 and 3D continuous structure of GA, the composites exhibit an excellent electrochemical performance. The mesostructure of composites can not only improve the Li + diffusion kinetics without great loss of tap density, but also facilitate the penetration of the electrolyte. When used as anode materials for lithium ion batteries, the TiO 2 /GA composites exhibit high superior capacity, good rate capability and long cycling stability. A reversible capacity of 663.2 mA h g −1 can be obtained at a current density of 100 mA g −1 after 250 cycles, and even at a high current rate of 5 A g −1 , a reversible capacity of 215.5 mA h g −1 can also be achieved after 4000 cycles. Owning to the simple synthesis method, unique microstructure, and excellent electrochemical performance, our work might apply a practical high-performance anode material for lithium ion batteries.
Source: Scopus
Template-free synthesis of mesoporous succulents-like TiO2/graphene aerogel composites for lithium-ion batteries
Authors: Cheng, L., Qiao, D., Zhao, P., He, Y., Sun, W., Yu, H. and Jiao, Z.
Journal: Electrochimica acta
Volume: 300
Pages: 417-425
Publisher: Elsevier
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2019.01.133
Abstract:Mesoporous succulents-like titanium dioxide (TiO2)/graphene aerogel (GA) composites are synthesized through a facile template-free method. The growth mechanism of the composites has been studied, which can be attributed to the Ostwald ripening mechanism. The succulents-like TiO2 submicron flowers grow in situ on the surface of GA. Moreover, they show a unique mesoporous structure. Due to the synergistic interaction of unique mesoporous succulents-like structure of TiO2 and 3D continuous structure of GA, the composites exhibit an excellent electrochemical performance. The mesostructure of composites can not only improve the Li+ diffusion kinetics without great loss of tap density, but also facilitate the penetration of the electrolyte. When used as anode materials for lithium ion batteries, the TiO2/GA composites exhibit high superior capacity, good rate capability and long cycling stability. A reversible capacity of 663.2 mA h g−1 can be obtained at a current density of 100 mA g−1 after 250 cycles, and even at a high current rate of 5 A g−1, a reversible capacity of 215.5 mA h g−1 can also be achieved after 4000 cycles. Owning to the simple synthesis method, unique microstructure, and excellent electrochemical performance, our work might apply a practical high-performance anode material for lithium ion batteries
Source: Manual