Tetrahydrofuran intercalated layered vanadium(III) phosphate electrode for aqueous zinc-ion battery

• Published in: Ionics 2023-11, Vol.29 (11), p.4743-4749
• Main Authors: Qiao, Yifan, Yuan, Jingjing, Lu, Yuchen, Ren, Yihan, Li, Yifan, Zhang, Zhihao, Chen, Haiqun
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrochemistry; Electrode materials; Electrodes; Energy Storage; Interlayers; Optical and Electronic Materials; Oxidation; Rechargeable batteries; Renewable and Green Energy; Structural stability; Tetrahydrofuran; Valence; Vanadium
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-023-05197-3

Layered VOPO 4 ·2H 2 O is considered a good electrode material structure for the insertion and extraction of energy storage ions, but the lattice water may affect the electrochemical stability. To provide more active site and more stable layered structure, the lattice water was replaced by tetrahydrofuran (THF), and the THF intercalated VOPO 4 was obtained. The interlayer spacing has changed from 7.4 to 6.3 Å after THF intercalation, and the layered structure of VOPO 4 -THF is well preserved. It offers enhanced structural stability during charge and discharge processes, minimizing electrode degradation. In addition, increasing the oxidation state of pentavalent vanadium in VOPO 4 -THF is also beneficial for enhancing the capacitance of electrode materials. Combining the stable layered structure with a high oxidation state, VOPO 4 -THF electrode material exhibits good capacity and long cycle life. Our work convert traditional VOPO 4 ·2H 2 O electrode into a promising high-performance active electrode for zinc-ion batteries.