Structural Study of Carbon-Coated TiO2 Anatase Nanoparticles as High-Performance Anode Materials for Na-Ion Batteries,ACS Applied Energy Materials

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Structural Study of Carbon-Coated TiO2 Anatase Nanoparticles as High-Performance Anode Materials for Na-Ion Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-09-06 00:00:00 , DOI: 10.1021/acsaem.9b01101
Giorgia Greco ₁ , Katherine A. Mazzio ₁ , Xinwei Dou _{2,

3} , Eike Gericke _{1,

4} , Robert Wendt ₁ , Michael Krumrey ₅ , Stefano Passerini _{2,

3}

Affiliation

In this work, we study the electronic and atomic structural modifications occurring in TiO₂ anatase nanoparticles as anode materials in Na-ion batteries upon sodiation and desodiation. The structural investigation is performed over both long- and short-range order by combining a comprehensive extended X-ray absorption fine structure (EXAFS) characterization with X-ray diffraction (XRD). The evolution of the electronic structure upon cycling is qualitatively investigated by X-ray absorption near-edge structure (XANES) analysis. The goal of this work is to correlate the outstanding electrochemical performance of carbon-coated TiO₂ anatase nanoparticles in sodium batteries with the electronic and structural modifications induced during the sodiation and desodiation processes upon cycling. This work also demonstrates for the first time a coherent explanation of the structural changes observed, where an electrochemically induced short-range ordering is revealed upon cycling.

中文翻译：

碳包覆的TiO ₂锐钛矿型纳米粒子作为钠离子电池高性能负极材料的结构研究

在这项工作中，我们研究了在钠离子电池中经过阳极氧化和脱氮后，作为阳极材料的TiO ₂锐钛矿纳米粒子中发生的电子和原子结构修饰。通过将全面的扩展X射线吸收精细结构（EXAFS）表征与X射线衍射（XRD）相结合，可以在长距离和短距离范围内进行结构研究。通过X射线吸收近边缘结构（XANES）分析定性地研究了循环时电子结构的演变。这项工作的目的是关联碳涂层的TiO ₂的出色电化学性能钠电池中的锐钛矿型纳米粒子，在循环过程中的成盐和脱盐过程中会产生电子和结构修饰。这项工作还首次证明了观察到的结构变化的连贯解释，其中在循环时揭示了电化学诱导的短程有序。

更新日期：2019-09-06

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