In Operando Probing of Sodium-Incorporation in NASICON Nanomaterial: Asymmetric Reaction and Electrochemical Phase Diagram,Chemistry of Materials

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In Operando Probing of Sodium-Incorporation in NASICON Nanomaterial: Asymmetric Reaction and Electrochemical Phase Diagram
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-09-25 00:00:00 , DOI: 10.1021/acs.chemmater.7b00957
Guobin Zhang ₁ , Tengfei Xiong ₁ , Mengyu Yan _{1,

2} , Yanan Xu ₁ , Wenhao Ren ₁ , Xu Xu ₁ , Qiulong Wei ₁ , Liqiang Mai _{1,

3}

Affiliation

NASICON-type materials are one of the most promising cathodes for sodium-ion batteries (SIBs) due to their stable structure and the three-dimensional framework for the migration of Na⁺. During the usage of SIBs, they should hold the ability to endure sudden changes in temperature and current density, which have a profound impact on battery life. However, little research focused on the reaction mechanism under the above situations. Here, the phase transformation processes of NASICON-type material, Na₃V₂(PO₄)₃, are investigated by applying high-resolution in situ X-ray diffraction and Raman coupled with electrochemical tests under different temperatures (273 and 293 K) and scan rates (0.5, 2, and 5 mV s^–1). The results demonstrate that the phase evolution process is one-phase solid solution during the desodiation process rather than the traditionally two-phase reaction at a high scan rate or low temperature. An electrochemical phase diagram is also drawn based on thein situ results, which can be used to explain the asymmetric result. This work can help with understanding the phase evolution process of NASICON-type cathodes, as well as guiding the application of SIBs in various working conditions.

中文翻译：

NASICON纳米材料中钠掺入的操作中的探索：不对称反应和电化学相图

NASICON型材料由于其稳定的结构和Na ⁺迁移的三维框架，因此是钠离子电池（SIB）最有希望的阴极之一。在使用SIB的过程中，它们应具有承受温度和电流密度突然变化的能力，这会对电池寿命产生深远的影响。然而，很少有研究集中在上述情况下的反应机理。在此，通过在不同温度（273和293 K）下应用高分辨率原位X射线衍射和拉曼光谱以及电化学测试，研究了NASICON型材料Na ₃ V ₂（PO ₄）₃的相变过程。和扫描速率（0.5、2和5 mV s^–1）。结果表明，相变过程是脱硝过程中的一相固溶体，而不是传统的在高扫描速率或低温下的两相反应。基于原位结果还绘制了电化学相图，可用于解释不对称结果。这项工作有助于理解NASICON型阴极的相变过程，并指导SIB在各种工作条件下的应用。

更新日期：2017-09-26

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