A Trifluoroacetate-based Concentrated Electrolyte for Symmetrical Aqueous Sodium-ion Battery with NASICON-type Na<sub>2</sub>VTi(PO<sub>4</sub>)<sub>3</sub> Electrodes
Kosuke Nakamoto, Ryo Sakamoto, Yuki Nishimura, Jingyu Xia, Masato Ito, Shigeto Okada
Abstract
A safe and low-cost aqueous electrolyte, in which maximum amount of sodium trifluoroacetate (NaTFA) is dissolved (26 mol kg−1), showed high ionic conductivity of 23 mS cm−1 and provided wide electrochemical stability window of 3.1 V. These attractive features may originate from so-called “water-in-salt” effect of the highly concentrated electrolyte in addition to a robust fluoride layer formed on anode thereof. This novel electrolyte enabled reversible operation of NASICON-type Na2VTi(PO4)3 as symmetrical operation based on V3+/4+ at cathode and Ti3+/4+ and V2+/3+ at anode, respectively.
Topics & Concepts
ElectrolyteElectrochemistryAqueous solutionAnodeInorganic chemistryCathodeChemistryIonic conductivityFast ion conductorConductivitySodiumBattery (electricity)IonMaterials scienceElectrodePhysical chemistryPower (physics)Organic chemistryPhysicsQuantum mechanicsAdvanced Battery Materials and TechnologiesAdvancements in Battery MaterialsAdvanced battery technologies research