<br>超薄 V2O5 纳米片中的多个阳离子纳米限制实现了高性能锌离子电池的超快离子扩散动力学,Advanced Materials

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超薄 V2O5 纳米片中的多个阳离子纳米限制实现了高性能锌离子电池的超快离子扩散动力学
Advanced Materials ( IF 27.4 ) Pub Date : 2024-01-29 , DOI: 10.1002/adma.202312982
Yang Liu ₁ , Chengjie Lu ₁ , Yunting Yang ₁ , Wenshu Chen ₁ , Fei Ye ₁ , Hongliang Dong ₂ , Yuping Wu ₃ , Renzhi Ma ₄ , Linfeng Hu ₁

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层状氧化物阴极中阳离子的纳米限制是实现先进锌离子存储性能的重要方法。然而，迄今为止，这种纳米限制的传统水热/溶剂热路线受到其不可控的相结构和同时多个阳离子共限制的困难的限制。在此，这项工作报告了使用各种单一阳离子（包括 Na ⁺ 、K ⁺ 、Mg ²⁺ 、Ca ²⁺ 、Zn ²⁺ 、Al ³⁺ 、NH ₄ ⁺ ）的超薄 V ₂ O ₅纳米片的一般超分子自组装，以及多种阳离子(NH ₄ ⁺ + Na ⁺ 、NH ₄ ⁺ + Na ⁺ + Ca ²⁺ 、NH ₄ ⁺ + Na ⁺ + Ca ²⁺ +Mg ²⁺ )。单一阳离子限制导致比容量和锌离子扩散动力学显着增加，而多重阳离子限制通过多重阳离子协同支柱效应产生优异的结构和循环稳定性。该组件系列中锌离子的优化扩散系数（7.5 × 10 ^-8 cm ² s ^-1 ）超过了迄今为止报道的大多数基于V的阴极。这项工作开发了一种新颖的多阳离子纳米限制策略，用于水系电池的高性能阴极。它还通过通用的超分子组装途径提供了对锌离子扩散动力学的客体阳离子调节的新见解。

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Multiple Cations Nanoconfinement in Ultrathin V2O5 Nanosheets Enables Ultrafast Ion Diffusion Kinetics Toward High-performance Zinc Ion Battery

Nanoconfinement of cations in layered oxide cathode is an important approach to realize advanced zinc ion storage performance. However, thus far, the conventional hydrothermal/solvothermal route for this nanoconfinement has been restricted to its uncontrollable phase structure and the difficulty on the multiple cation co-confinement simultaneously. Herein, this work reports a general, supramolecular self-assembly of ultrathin V₂O₅ nanosheets using various unitary cations including Na⁺, K⁺, Mg²⁺, Ca²⁺, Zn²⁺, Al³⁺, NH₄⁺, and multiple cations (NH₄⁺ + Na⁺, NH₄⁺ + Na⁺ + Ca²⁺, NH₄⁺ + Na⁺ + Ca²⁺ +Mg²⁺). The unitary cation confinement results in a remarkable increase in the specific capacity and Zn-ion diffusion kinetics, and the multiple cation confinement gives rise to superior structural and cycling stability by multiple cation synergetic pillaring effect. The optimized diffusion coefficient of Zn-ion (7.5 × 10⁻⁸ cm² s⁻¹) in this assembly series surpasses most of the V-based cathodes reported up to date. The work develops a novel multiple-cations nanoconfinement strategy toward high-performance cathode for aqueous battery. It also provides new insights into the guest cation regulation of zinc-ion diffusion kinetics through a general, supramolecular assembly pathway.

更新日期：2024-01-29

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