Finely crafted lanthanum vanadium oxide cathode as durable and flexible quasi-solid state zinc ion battery

• Published in: Journal of materials science. Materials in electronics Vol. 33; no. 8; pp. 5635 - 5647
• Main Authors: Xu, Wengang, Ru, Qiang, Pan, Zikang, Zheng, Minhui, Wu, Jinlin, Zhao, Xing, Chen, Fuming, Zhang, Jun, Ling, Francis Chi-Chung
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2022; Springer Nature B.V
• Subjects: Batteries; Cathodes; Characterization and Evaluation of Materials; Chemistry and Materials Science; Clean energy; Clean technology; Discharge; Durability; Electrochemical analysis; Electrolytes; Energy storage; Flux density; Laboratories; Lanthanum; Materials Science; Optical and Electronic Materials; Rare earth elements; Rechargeable batteries; Retention; Solid state; Storage batteries; Vanadium oxides; Zinc
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-022-07750-8

Aqueous Zinc ion batteries grant intriguing potential to large-scale energy storage, but they are still plagued by trade-off in high discharge capacity and long cycle life. In this work, such a critical barrier can be well solved by a novel cathode, rare-earth lanthanum orthovanadate (LaVO 4 ). For traditional aqueous cells, the LaVO 4 (LVO) cathode delivers a high discharge capacity of 351.8 mAh g −1 at 0.5 A g −1 , and ultralong cyclic life (93.5% retention after 6500 cycles at 5 A g −1 ). Moreover, the estimated energy density of the Zn//LVO batteries is 316.6 Wh kg −1 at a power density of 450 W kg −1 . Investigation into the mechanism of the charge storage demonstrates that the capacity contribution of pseudocapacitance behavior is dominant, which explains its excellent rate capability. For flexible quasi-solid-state zinc ion batteries, the LVO@CNT films show impressive rate capability and high bending  durability (137.8 mAh g −1 at 8 A g −1 ). The superior electrochemical performance of LVO suggests its great potential in clean energy.