Cao Jin, Zhang Dongdong, Yue Yilei, Pakornchote Teerachote, Bovornratanaraks Thiti, Zhang Xinyu, Zeng Zhiyuan, Qin Jiaqian, Huang Yunhui
International Graduate Program of Nanoscience & Technology, Chulalongkorn University, Bangkok10330, Thailand.
Research Unit of Advanced Materials for Energy Storage, Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok10330, Thailand.
ACS Appl Mater Interfaces. 2022 Feb 16;14(6):7909-7916. doi: 10.1021/acsami.1c21581. Epub 2022 Feb 1.
Aqueous zinc ion batteries (ZIBs) are emerging as a promising candidate in the post-lithium ion battery era, while the limited choice of cathode materials plagues their further development, especially the tunnel-type cathode materials with high electrochemical performance. Here, a tunnel-type vanadium-based compound based on hydrogen vanadium bronze (HVO) microspheres has been fabricated and employed as the cathode for fast Zn ions' intercalation/deintercalation, which delivers an excellent capacity (425 mAh g at 0.1 A g), a remarkable cyclability (91.3% after 5000 cycles at 20 A g), and a sufficient energy density (311.5 Wh kg). As revealed by the experimental and theoretical results, such excellent electrochemical performance is confirmed to result from the fast ions/electrons diffusion kinetics promoted by the unique tunnel structure (3.7 × 4.22 Å, along the direction), which accomplishes a low Zn ion diffusion barrier and the superior electron-transfer capability of HVO. These results shed light on designing tunnel-type vanadium-based compounds to boost the prosperous development of Zn ion storage cathodes.
水系锌离子电池（ZIBs）在锂离子电池时代之后正成为一种有前景的候选电池，然而阴极材料选择有限阻碍了它们的进一步发展，尤其是具有高电化学性能的隧道型阴极材料。在此，一种基于氢钒青铜（HVO）微球的隧道型钒基化合物已被制备出来，并用作阴极以实现快速的锌离子嵌入/脱嵌，其具有出色的容量（在0.1 A g时为425 mAh g）、卓越的循环稳定性（在20 A g下5000次循环后为91.3%）以及足够的能量密度（311.5 Wh kg）。实验和理论结果表明，这种优异的电化学性能源于独特隧道结构（沿 方向为3.7×4.22 Å）促进的快速离子/电子扩散动力学，这实现了低的锌离子扩散势垒以及HVO卓越的电子转移能力。这些结果为设计隧道型钒基化合物以推动锌离子存储阴极的蓬勃发展提供了思路。
