科研之友
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摘要
In this study, a new acid-assisted hydrothermal method was presented for the synthesis of dandelion-like mesoporous rutile TiO2 microspheres (MSPs) without using any template and surfactant. With this strategy, the spherical structure and pore size of the obtained TiO2 particles could be readily controlled just through varying the kind of acid (e.g., HNO3-TiO2 and HCl-TiO2 MSPs show different pore size distribution of 6 +/- 2 nm and 12 +/- 2 nm, respectively). Benefiting from the mesoporous structure, high specific surface area, and especially the high percentage of exposed (002) crystal facets, the samples of HNO3-TiO2 and HCl-TiO2 MSPs exhibit excellent electrochemical performance in lithium-ion batteries. For example, a high capacity of around 164.5 and 160.6 mA h g(-1) at a rate of 0.1 C, and a reversible capacity of over 141.9 and 133.3 mA h g(-1) after 100 cycles at a rate of 1 C were demonstrated respectively for the samples of HNO3-TiO2 and HCl-TiO2 MSPs (1 C = 168 mA h g(-1)). Moreover, another two kinds of mesoporous Li4Ti5O12 spheres (HNO3-Li4Ti5O12 and HCl-Li4Ti5O12 MSPs) were further prepared based on the above TiO2 precursors. Promisingly, they also showed a higher improved performance in lithium battery application, such as a high capacity of around 173.6 and 174 mA h g(-1) at a rate of 0.1 C and a reversible capacity of over 161.9 mA h g(-1) and 170.4 mA h g(-1) after 100 cycles at a rate of 1 C (1 C = 175 mA h g(-1)).
