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首页> 外文期刊>Chemistry: A European journal >Facile Aluminum Reduction Synthesis of Blue TiO2 with Oxygen Deficiency for Lithium-Ion Batteries
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Facile Aluminum Reduction Synthesis of Blue TiO2 with Oxygen Deficiency for Lithium-Ion Batteries

机译：锂离子电池缺氧的铝还原法合成蓝色TiO2

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摘要

An ultrafacile aluminum reduction method is reported herein for the preparation of blue TiO2 nanoparticles (donated as Al-TiO2, anatase phase) with abundant oxygen deficiency for lithium-ion batteries. Under aluminum reduction, the morphology of the TiO2 nanosheets changes from well-defined rectangular into uniform round or oval nanoparticles and the particle size also decreases from 60 to 31 nm, which can aggressively accelerate the lithium-ion diffusion. Electron paramagnetic resonance (EPR) and positron annihilation lifetime spectroscopy (PALS) results reveal that plentiful oxygen deficiencies relative to the Ti3+ species were generated in blue Al-TiO2; this effectively enhances the electron conductivity of the TiO2. X-ray photoelectron spectrometry (XPS) analysis indicates that a small peak is observed for the Al-O bond, which probably plays a very important role in the stabilization of the oxygen deficiencies/Ti3+ species. As a result, the blue Al-TiO2 possesses significantly higher capacity, better rate performance, and a longer cycle life than the white pure TiO2. Such improvements can be attributed to the decreased particle size, as well as the existence of the oxygen deficiencies/Ti3+ species.
机译：本文报道了一种超容易的铝还原方法，该方法用于制备锂离子电池具有大量缺氧的蓝色TiO2纳米颗粒（捐赠为Al-TiO2，锐钛矿相）。在铝还原下，TiO2纳米片的形态从明确的矩形变为均匀的圆形或椭圆形纳米颗粒，并且粒径也从60 nm减小到31 nm，这可以积极地促进锂离子的扩散。电子顺磁共振（EPR）和正电子an没寿命光谱（PALS）结果表明，蓝色Al-TiO2中产生了相对于Ti3 +物种的大量氧缺乏;这有效地提高了TiO2的电子电导率。 X射线光电子能谱（XPS）分析表明，观察到一个Al-O键的小峰，这可能在氧缺乏症/ Ti3 +物种的稳定中起着非常重要的作用。结果，与白色的纯TiO2相比，蓝色的Al-TiO2具有显着更高的容量，更好的倍率性能和更长的循环寿命。这种改善可以归因于减小的粒度以及氧缺乏/ Ti 3+物质的存在。

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