Liu Yang, Lu Chengjie, Yang Yunting, Chen Wenshu, Ye Fei, Dong Hongliang, Wu Yuping, Ma Renzhi, Hu Linfeng
School of Materials Science and Engineering, Southeast University, Nanjing, 211189, P. R. China.
Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, P. R. China.
Adv Mater. 2024 May;36(18):e2312982. doi: 10.1002/adma.202312982. Epub 2024 Jan 29.
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 VO nanosheets using various unitary cations including Na, K, Mg, Ca, Zn, Al, NH , and multiple cations (NH + Na, NH + Na + Ca, NH + Na + Ca +Mg). 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 cm s) 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.
阳离子在层状氧化物阴极中的纳米限域是实现先进锌离子存储性能的重要途径。然而，迄今为止，用于这种纳米限域的传统水热/溶剂热路线受到其不可控的相结构以及同时进行多阳离子共限域的困难的限制。在此，本工作报道了一种通用的、使用包括Na、K、Mg、Ca、Zn、Al、NH 以及多阳离子（NH + Na、NH + Na + Ca、NH + Na + Ca + Mg）的各种单一阳离子的超薄VO纳米片的超分子自组装。单一阳离子限域导致比容量和锌离子扩散动力学显著增加，而多阳离子限域通过多阳离子协同支撑效应产生优异的结构和循环稳定性。在该组装系列中，优化后的锌离子扩散系数（7.5 × 10 cm s）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针对水系电池高性能阴极的新型多阳离子纳米限域策略。它还通过通用的超分子组装途径为锌离子扩散动力学的客体阳离子调控提供了新的见解。
