A Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>O<sub>1.6</sub>F<sub>1.4</sub> Cathode of Zn‐Ion Battery Enabled by a Water‐in‐Bisalt Electrolyte
Qiao Ni, Heng Jiang, Sean K. Sandstrom, Ying Bai, Haixia Ren, Xianyong Wu, Qiubo Guo, Dongxu Yu, Chuan Wu, Xiulei Ji
Abstract
Abstract Aqueous zinc‐ion batteries are receiving increasing attention; however, the development of high‐voltage cathodes is limited by the narrow voltage window of conventional aqueous electrolytes. Herein, it is reported that Na 3 V 2 (PO 4 ) 2 O 1.6 F 1.4 exhibits the excellent performance, optimal to date, among polyanion cathode materials in a novel neutral water‐in‐bisalts electrolyte of 25 m ZnCl 2 + 5 m NH 4 Cl. It delivers a reversible capacity of 155 mAh g −1 at 50 mA g −1 , a high average operating potential of ≈1.46 V, and stable cyclability of 7000 cycles at 2 A g −1 .
Topics & Concepts
CathodeMaterials scienceElectrolyteAqueous solutionIonBattery (electricity)ElectrochemistryInorganic chemistryAnalytical Chemistry (journal)ElectrodePhysical chemistryChemistryPhysicsQuantum mechanicsOrganic chemistryChromatographyPower (physics)Advanced battery technologies researchAdvanced Battery Materials and TechnologiesSupercapacitor Materials and Fabrication