Boosting Zn2+ Diffusion via Tunnel-Type Hydrogen Vanadium Bronze for High-Performance Zinc Ion Batteries

作者：Cao, Jin; Zhang, Dongdong; Yue, Yilei; Pakornchote, Teerachote; Bovornratanaraks, Thiti; Zhang, Xinyu^*; Zeng, Zhiyuan^*; Qin, Jiaqian^*; Huang, Yunhui

来源：ACS applied materials & interfaces, 2022, 14(6): 7909-7916.

DOI：10.1021/acsami.1c21581

• zinc ion battery
• electrode
• tunnel-type HxV2O5
• energy barrier
• diffusion kinetics

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 (HxV2O5) microspheres has been fabricated and employed as the cathode for fast Zn2+ ions' intercalation/deintercalation, which delivers an excellent capacity (425 mAh g(-1) at 0.1 A g(-1)), a remarkable cyclability (91.3% after 5000 cycles at 20 A g(-1)), and a sufficient energy density (311.5 Wh kg(-1)). 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 x 4.22 angstrom(2), along the c direction), which accomplishes a low Zn2+ ion diffusion barrier and the superior electron-transfer capability of HxV2O5. These results shed light on designing tunnel-type vanadium-based compounds to boost the prosperous development of Zn2+ ion storage cathodes.

• 单位
  燕山大学; 华中科技大学