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Anatase TiO2: Better Anode Material Than Amorphous and Rutile Phases of TiO2 for Na-Ion Batteries
Chemistry of Materials ( IF 7.2 ) Pub Date : 2015-08-18 00:00:00 , DOI: 10.1021/acs.chemmater.5b02348 Dawei Su 1 , Shixue Dou 2 , Guoxiu Wang 1, 3
Chemistry of Materials ( IF 7.2 ) Pub Date : 2015-08-18 00:00:00 , DOI: 10.1021/acs.chemmater.5b02348 Dawei Su 1 , Shixue Dou 2 , Guoxiu Wang 1, 3
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Amorphous TiO2@C nanospheres were synthesized via a template approach. After being sintered under different conditions, two types of polyphase TiO2 hollow nanospheres were obtained. The electrochemical properties of the amorphous TiO2 nanospheres and the TiO2 hollow nanospheres with different phases were characterized as anodes for the Na-ion batteries. It was found that all the samples demonstrated excellent cyclability, which was sustainable for hundreds of cycles with little capacity fading, although the anatase TiO2 presented a capability that was better than that of the mixed anatase/rutile TiO2 or the amorphous TiO2@C. Through crystallographic analysis, it was revealed that the anatase TiO2 crystal structure supplies two-dimensional diffusion paths for Na-ion intercalation and more accommodation sites. Density functional theory calculations indicated lower energy barriers for the insertion of Na+ into anatase TiO2. Therefore, anatase TiO2 hollow nanospheres show excellent high-rate performance. Through ex situ field emission scanning electron microscopy, it was revealed that the TiO2 hollow nanosphere architecture can be maintained for hundreds of cycles, which is the main reason for its superior cyclability.
中文翻译：
锐钛矿型TiO 2：比钠离子电池用TiO 2的非晶相和金红石相更好的阳极材料
通过模板法合成了无定形的TiO 2 @C纳米球。在不同条件下烧结后，得到两种类型的多相TiO 2中空纳米球。将非晶态的TiO 2纳米球和不同相的TiO 2空心纳米球的电化学性质表征为Na离子电池的阳极。发现所有样品都表现出优异的循环能力，即使锐钛矿TiO 2表现出比混合的锐钛矿/金红石TiO 2或无定形TiO 2更好的能力，其循环能力可维持数百次而几乎没有褪色。@C。通过晶体学分析，揭示了锐钛矿型TiO 2晶体结构提供了用于Na离子嵌入和更多容纳位点的二维扩散路径。密度泛函理论计算表明，Na +插入锐钛矿型TiO 2中的能垒较低。因此，锐钛矿型TiO 2中空纳米球显示出优异的高速率性能。通过异位场发射扫描电子显微镜，发现TiO 2中空纳米球结构可以维持数百个循环，这是其优异的可循环性的主要原因。
更新日期：2015-08-18
中文翻译：
锐钛矿型TiO 2：比钠离子电池用TiO 2的非晶相和金红石相更好的阳极材料
通过模板法合成了无定形的TiO 2 @C纳米球。在不同条件下烧结后，得到两种类型的多相TiO 2中空纳米球。将非晶态的TiO 2纳米球和不同相的TiO 2空心纳米球的电化学性质表征为Na离子电池的阳极。发现所有样品都表现出优异的循环能力，即使锐钛矿TiO 2表现出比混合的锐钛矿/金红石TiO 2或无定形TiO 2更好的能力，其循环能力可维持数百次而几乎没有褪色。@C。通过晶体学分析，揭示了锐钛矿型TiO 2晶体结构提供了用于Na离子嵌入和更多容纳位点的二维扩散路径。密度泛函理论计算表明，Na +插入锐钛矿型TiO 2中的能垒较低。因此，锐钛矿型TiO 2中空纳米球显示出优异的高速率性能。通过异位场发射扫描电子显微镜，发现TiO 2中空纳米球结构可以维持数百个循环，这是其优异的可循环性的主要原因。
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