Wang Xiao, Xi Baojuan, Ma Xiaojian, Feng Zhenyu, Jia Yuxi, Feng Jinkui, Qian Yitai, Xiong Shenglin
Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P.R. China.
Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, P.R. China.
Nano Lett. 2020 Apr 8;20(4):2899-2906. doi: 10.1021/acs.nanolett.0c00732. Epub 2020 Mar 19.
Vanadium-based compounds with an open framework structure have become the subject of much recent investigation into aqueous zinc-ion batteries (AZIBs) due to high specific capacity. However, there are some issues with vanadium dissolution from a cathode framework as well as the generation of byproducts during discharge that should not be ignored, which could cause severe capacity deterioration and inadequate cycle life. Herein, we report several barium vanadate nanobelt cathodes constructed of two sorts of architectures, i.e., BaVO·3HO and BaVO·3HO (VO-type) and BaVO·HO (VO-type), which are controllably synthesized by tuning the amount of barium precursor. Benefiting from the robust architecture, layered BaVO-type nanobelts (BaVO·3HO) exhibit superior rate capability and long-term cyclability owing to fast zinc-ion kinetics, enabled by efficiently suppressing cathode dissolution as well as greatly eliminating the generation of byproduct ZnSO(OH)·HO, which provides a reasonable strategy to engineer cathode materials with robust architectures to improve the electrochemical performance of AZIBs.
具有开放框架结构的钒基化合物由于其高比容量，最近已成为水性锌离子电池（AZIBs）研究的热门课题。然而，阴极框架中的钒溶解以及放电过程中副产物的产生等问题不容忽视，这些问题可能导致严重的容量衰减和循环寿命不足。在此，我们报道了几种由两种结构构建的钒酸钡纳米带阴极，即BaVO·3HO和BaVO·3HO（VO型）以及BaVO·HO（VO型），它们是通过调节钡前驱体的量可控合成的。得益于坚固的结构，层状BaVO型纳米带（BaVO·3HO）由于快速的锌离子动力学而表现出优异的倍率性能和长期循环稳定性，这是通过有效抑制阴极溶解以及极大地消除副产物ZnSO(OH)·HO的产生实现的，这为设计具有坚固结构的阴极材料以改善AZIBs的电化学性能提供了合理的策略。
