Zhao Zhenzhen, Liu Miao, Liu Fuxi, Jing Haifeng, Xu Boning, Song Kexin, Zhang Wei, Zheng Weitao
Key Laboratory of Automobile Materials MOE, School of Materials Science & Engineering, Electron Microscopy Center, International Center of Future Science, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun 130012, China.
Nano Lett. 2024 Nov 6;24(44):13927-13934. doi: 10.1021/acs.nanolett.4c02720. Epub 2024 Oct 23.
The notorious collapse of the electrode structure and strong electrostatic interactions in aqueous zinc-ion batteries (AZIBs) limit the achievement of a long cycle life. Herein, by designing an ordered/disordered hybrid structure, we have effectively preserved the integrity of the VO·1.6HO (VOH) electrode. Moreover, our approach facilitates the release of stress concentration contributed to by the amorphous component, alleviating the strong electrostatic interaction merited by crystal water and promoting the diffusion kinetics of Zn assisted by the crystalline component. Noteworthy, the crystal water serves as an interlayer pillar significantly enhancing the structural stability of the electrode. As a result, our VOH electrode exhibits high electrochemical performance. It delivered 227.8 mAh g at a higher current density of 2 A g, and a high cycle life of 1000 cycles with 95% capacity retention was achieved at a current density of 1 A g.
水系锌离子电池（AZIBs）中电极结构的显著坍塌和强烈的静电相互作用限制了长循环寿命的实现。在此，通过设计有序/无序混合结构，我们有效地保持了VO·1.6HO（VOH）电极的完整性。此外，我们的方法促进了由非晶成分导致的应力集中的释放，减轻了由结晶水引起的强烈静电相互作用，并促进了由结晶成分辅助的锌的扩散动力学。值得注意的是，结晶水作为层间支柱显著增强了电极的结构稳定性。结果，我们的VOH电极表现出高电化学性能。在2 A g的较高电流密度下，其放电比容量为227.8 mAh g，在1 A g的电流密度下实现了1000次循环的高循环寿命，容量保持率为95%。
