A stable "rocking-chair" zinc-ion battery boosted by low-strain Zn3V4(PO4)6 cathode

• Published in: Nano energy Vol. 100; p. 107520
• Main Authors: Zhao, Dong, Chen, Susu, Lai, Yangyang, Ding, Mingyue, Cao, Yuliang, Chen, Zhongxue
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2022
• Subjects: Aqueous zinc batteries; Low-strain; Rocking-chair batteries; Spray drying; Vanadium-based phosphate; Aqueous zinc batteries; Vanadium-based phosphate; Spray drying; Rocking-chair batteries; Low-strain
• ISSN: 2211-2855
• DOI: 10.1016/j.nanoen.2022.107520

Aqueous zinc metal batteries benefit from the high volumetric energy density and rich abundance of zinc metal, but suffer from the uncontrollable dendrites, passivation and corrosion which severely hinder their development. Developing Zn-containing cathodes to couple with Zn-free anodes is an effect approach to overcome the above challenges, however, such robust hosts that can afford reversible and stable Zn2+ storage have been rarely reported. Herein, we reported a novel low-strain Zn3V4(PO4)6 cathode for zinc-ion battery which delivers a specific capacity of 105.2 mAh g−1, outstanding cycling stability (100 % capacity retention over 250 cycles) and superior rate capability (62.9 mAh g−1 at 40 C). Both density functional theory (DFT) calculation and in-situ characterization reveals the small volume change (2.4 %) of Zn3V4(PO4)6 upon Zn2+ storage. Note that a "rocking-chair" zinc-ion battery is established based on the Zn3V4(PO4)6 cathode and layered TiS2 anode, which demonstrates remarkable electrochemical reversibility and favorable cycling stability. [Display omitted] •Zn3V4(PO4)6 is firstly reported as a low strain cathode for zinc-ion battery.•Zn3V4(PO4)6 exhibits outstanding Zn2+-storage performances.•"Rocking-Chair" full battery is established by Zn3V4(PO4)6 and TiS2.