Synthesis of polycrystalline K0.25V2O5 nanoparticles as cathode for aqueous zinc-ion battery

• Published in: Journal of alloys and compounds Vol. 801; pp. 82 - 89
• Main Authors: Li, Shi, Chen, Minghui, Fang, Guozhao, Shan, Lutong, Cao, Xinxin, Huang, Jiwu, Liang, Shuquan, Zhou, Jiang
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.09.2019; Elsevier BV
• Subjects: Aqueous zinc-ion batteries; Cathode material; Cathodes; Cyclic stability; K0.25V2O5; Morphology; Nanoparticles; Polycrystals; Rate capability; Storage batteries; Zinc; Cyclic stability; Cathode material; Aqueous zinc-ion batteries; K0.25V2O5; Rate capability
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.06.084

Polycrystalline K0.25V2O5 nanoparticles have been synthesized and evaluated as cathode for aqueous zinc-ion batteries, which demonstrates excellent Zn2+ storage capability. As elucidated, a high capacity of 306 mA h g−1, excellent rate capability of 5 A g−1 and long-term cyclic stability up to 500 cycles at 2 A g−1 are achieved. The effect of the K+ ions and the role of morphology for K0.25V2O5 cathode were also discussed in this work. CV measurements at different rates demonstrate that partial surface-controlled capacitive behavior contributes to the capacity of polycrystalline K0.25V2O5 nanoparticles. The zinc storage mechanism is investigated, which demonstrates as a highly reversible intercalation-type cathode for K0.25V2O5 with unique three-dimensional tunnel structure. We have synthesized and employed the polycrystal K0.25V2O5 nanoparticles as cathode for aqueous zinc-ion batteries, which demonstrates excellent Zn2+ storage capability. [Display omitted] •Polycrystalline K0.25V2O5 nanoparticles are evaluated as cathode for aqueous ZIBs.•K0.25V2O5 demonstrates a highly reversible intercalation storage mechanism.•The K0.25V2O5 exhibits superior Zn2+ storage capability, e.g. long-term cyclic stability.