Ultrafast 3D Hybrid-Ion Transport in Porous V2O5 Cathodes for Superior-Rate Rechargeable Aqueous Zinc Batteries,Advanced Energy Materials

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Ultrafast 3D Hybrid-Ion Transport in Porous V2O5 Cathodes for Superior-Rate Rechargeable Aqueous Zinc Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-03-22 , DOI: 10.1002/aenm.202204358
Tianhao Wang ₁ , Shengwei Li ₁ , Xinger Weng ₁ , Lei Gao ₁ , Yu Yan ₁ , Ning Zhang ₂ , Xuanhui Qu ₁ , Lifang Jiao ₃ , Yongchang Liu _{1,

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Affiliation

Layered V₂O₅ is a star cathode material of rechargeable aqueous zinc-based batteries (RAZBs) owing to the rich redox chemistry of vanadium, which commonly exhibits the 2D ion-diffusion mechanism through Zn²⁺ (de)intercalation at edge sites but is plagued by the inert basal planes. Here, hierarchically porous V₂O₅ nanosheets vertically grown on carbon cloth (V₂O₅/C) are innovatively prepared, where the porous structure with lattice defects successfully unlocks the V₂O₅ basal plane to provide additional ion-diffusion channels and abundant active sites. Thus, highly efficient and ultrafast 3D Li⁺/Zn²⁺ co-insertion/extraction behaviors along both the c-axis and ab plane of V₂O₅ are realized for the first time in the formulated 15 m LiTFSI + 1 m Zn(CF₃SO₃)₂ aqueous electrolyte, as elucidated by systematic ex situ analyses, multiple electrochemical measurements, and theoretical computations. As a result, the porous V₂O₅/C electrode delivers an exceptional high-rate capability (up to 100 A g⁻¹) and an ultralong cycling durability (15 000 cycles) in RAZBs. Finally, quasi-solid-state wearable rechargeable zinc batteries employing the porous V₂O₅/C cathode demonstrate respectable performance even under severe deformations and low temperatures. This work achieves a conceptual breakthrough represented by an upgrading of the traditional 2D ion transportation in layered cathodes to the more facile 3D diffusion for designing high-performance battery electrochemistry.

中文翻译：

多孔 V2O5 阴极中的超快 3D 混合离子传输，用于高倍率可充电水性锌电池

层状 V ₂ O ₅是可充电水性锌基电池 (RAZB) 的星形正极材料，因为钒具有丰富的氧化还原化学性质，通常通过边缘位置的 Zn 2+ (脱)嵌入表现出二维离子扩散机制，^但被惰性基面所困扰。在这里，创新地制备_了在碳布 (V 2 O 5 /C) 上垂直生长的分级多孔 V 2 O 5 纳米片_，其中_具有晶格缺陷的多孔结构成功解锁了 V ₂ O ₅基_面以提供额外的离子扩散通道和丰富的活性位点。因此，高效超快的 3D Li ⁺在配制的 15 m LiTFSI + 1 m Zn(CF ₃ SO ₃ ) ₂水性电解质中，首次实现了沿V ₂ O _5的c轴和ab平面的/Zn 2+^共插入/脱出行为，正如系统的非原位分析、多种电化学测量和理论计算所阐明的那样。因此，多孔 V ₂ O ₅ /C 电极具有出色的高倍率能力（高达 100 A g ⁻¹) 和 RAZB 的超长循环耐久性（15000 次循环）。最后，即使在严重变形和低温下，采用多孔 V ₂ O ₅ /C 阴极的准固态可穿戴可充电锌电池也表现出可观的性能。这项工作实现了概念上的突破，其代表是将层状阴极中的传统 2D 离子传输升级为更容易的 3D 扩散，用于设计高性能电池电化学。

更新日期：2023-03-22

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