Boosted Zn2+ storage performance of hydrated vanadium oxide by defect and heterostructure,Journal of Materials Chemistry A

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Boosted Zn2+ storage performance of hydrated vanadium oxide by defect and heterostructure
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-06-09 , DOI: 10.1039/d2ta03389e
Viet Phuong Nguyen _{1,

2} , Ji Su Park ₃ , Jong Min Yuk ₃ , Minsub Oh ₂ , Jae-Hyun Kim _{1,

2} , Seung-Mo Lee _{1,

2}

Affiliation

The inherent sluggish Zn²⁺ diffusion and poor electronic conductivity limit the ion intercalation/deintercalation process in aqueous Zn-ion batteries (ZIBs) using an oxide-based cathode. Here, we demonstrated that a heterostructure in the form of defective hydrated vanadium oxide embedded in the porous carbon textile (d-VOH@CT) could tackle these issues. The additional edges created by crystal defects significantly promoted facile Zn-ion adsorption and intercalation. Expanded interlayer spacing and reduced crystalline domain size kinetically facilitated fast Zn-ion diffusion in d-VOH flakes with shortened diffusion paths. Moreover, the heterostructure of d-VOH on the conductive carbon textile triggered rapid charge transfer, leading to high rate capability and structural stability. The ZIBs fabricated using the d-VOH@CT cathode delivered a preferable reversible capacity of 416 mA h g⁻¹ at 0.1 A g⁻¹, an impressive energy density of 293 W h kg⁻¹ and long cycle life. In addition, the d-VOH@CT heterostructure was able to be used as a freestanding cathode for a flexible ZIB with outstanding mechanical robustness and electrochemical stability.

中文翻译：

通过缺陷和异质结构提高水合氧化钒的 Zn2+ 存储性能

固有的呆滞 Zn ²⁺扩散和较差的电子导电性限制了使用氧化物阴极的水系锌离子电池 (ZIB) 中的离子嵌入/脱嵌过程。在这里，我们证明了嵌入多孔碳织物（d-VOH@CT）中的有缺陷的水合氧化钒形式的异质结构可以解决这些问题。晶体缺陷产生的额外边缘显着促进了锌离子的吸附和嵌入。扩大的层间距和减小的晶畴尺寸在动力学上促进了 d-VOH 薄片中的快速 Zn 离子扩散，并缩短了扩散路径。此外，d-VOH 在导电碳织物上的异质结构引发了快速的电荷转移，从而获得了高倍率性能和结构稳定性。^-1 at 0.1 A g^{-1 ，293 W h kg}^-1的惊人能量密度和长循环寿命。此外，d-VOH@CT 异质结构能够用作柔性 ZIB 的独立阴极，具有出色的机械鲁棒性和电化学稳定性。

更新日期：2022-06-14

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