操纵氧空位来激发 V2O5 结构中的离子动力学，以获得优质水系锌离子电池,Advanced Functional Materials

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操纵氧空位来激发 V2O5 结构中的离子动力学，以获得优质水系锌离子电池
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-07-10 , DOI: 10.1002/adfm.202305659
Jia‐Jia Ye ₁ , Pei‐Hua Li ₂ , Hao‐Ran Zhang ₁ , Zong‐Yin Song ₂ , Tianju Fan ₁ , Wanqun Zhang ₁ , Jie Tian ₁ , Tao Huang ₁ , Yitai Qian ₁ , Zhiguo Hou ₁ , Netanel Shpigel ₃ , Li‐Feng Chen ₁ , Shi Xue Dou _{4,

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Affiliation

钒基插层材料在水性锌离子电池（ZIB）中引起了广泛关注。然而，由于强静电相互作用，锌离子的层间扩散缓慢，严重限制了其实际应用。在此，制备了具有扩大的层间空间和优异的结构稳定性的富氧空位的V ₂ O ₅结构（Zn _0.125 V ₂ O ₅ ·0.95H ₂ O纳米花，O _v -ZVO），用于优异的ZIB。原位电子顺磁共振（EPR）和X射线衍射（XRD）表征表明，由于部分逃逸的晶格水，在相对较低的反应温度下会产生大量氧空位。原位光谱和密度泛函理论（DFT）计算表明，氧空位的存在降低了O _{v -ZVO中Zn}²⁺扩散势垒，削弱了Zn和O原子之间的相互作用，从而有助于优异的电化学性能。Zn||O _v -ZVO电池在0.1 A g ^{-1下表现出402 mAh g}^-1的非凡容量，在2673 W kg ^-1下表现出193 Wh kg ^-1的令人印象深刻的能量输出。作为概念验证，Zn||O _v -ZVO 软包电池可以在 0.5 A g ^{-1下达到 350 mAh g}^-1的高容量，展示了其实际应用的巨大潜力。这项研究提供了关于氧空位纳米结构的形成和产生的氧空位改善电化学性能的基本见解，为缺陷功能化先进材料指明了新途径。

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Manipulating Oxygen Vacancies to Spur Ion Kinetics in V2O5 Structures for Superior Aqueous Zinc-Ion Batteries

Vanadium-based intercalation materials have attracted considerable attention for aqueous zinc-ion batteries (ZIBs). However, the sluggish interlaminar diffusion of zinc ions due to the strong electrostatic interaction, severely restricts their practical application. Herein, oxygen vacancy-enriched V₂O₅ structures (Zn_0.125V₂O₅·0.95H₂O nanoflowers, O_v-ZVO) with expanded interlamellar space and excellent structural stability are prepared for superior ZIBs. In situ electron paramagnetic resonance (EPR) and X-ray diffraction (XRD) characterization revealed that numerous oxygen vacancies are generated at a relatively low reaction temperature because of partially escaped lattice water. In situ spectroscopy and density functional theory (DFT) calculations unraveled that the existence of oxygen vacancies lowered Zn²⁺ diffusion barriers in O_v-ZVO and weakened the interaction between Zn and O atoms, thus contributing to excellent electrochemical performance. The Zn||O_v-ZVO battery displayed a remarkable capacity of 402 mAh g⁻¹ at 0.1 A g⁻¹ and impressive energy output of 193 Wh kg⁻¹ at 2673 W kg⁻¹. As a proof of concept, the Zn||O_v-ZVO pouch cell can reach a high capacity of 350 mAh g⁻¹ at 0.5 A g⁻¹, demonstrating its enormous potential for practical application. This study provides fundamental insights into formation of oxygen-vacant nanostructures and generated oxygen vacancies improving electrochemical performance, directing new pathways toward defect-functionalized advanced materials.

更新日期：2023-07-10

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