title: Sodium vanadium oxide: a new material for high-performance symmetric sodium-ion batteries.
abstract: Room-temperature sodium-ion batteries have the potential to become the technology of choice for large-scale electrochemical energy storage because of the high sodium abundance and low costs. However, not many materials meet the performance requirements for practical applications. Here, we report a novel sodium-ion battery electrode material, Na(2.55)V(6)O(16)⋅0.6 H(2)O, that shows significant capacities and stabilities at high current rates up to 800 mA g(-1). X-ray photoelectron spectroscopy measurements are carried out to better understand the underlying reactions. Moreover, due to the different oxidation states of vanadium, this material can also be employed in a symmetric full cell, which would decrease production costs even further. For these full cells, capacity and stability tests are conducted using various cathode:anode mass ratios.
authors.affiliation: TUM CREATE, Singapore 138602 (Singapore); Technische Universität München, 85748 Garching (Germany).
authors.forename: Steffen
authors.initials: S
authors.lastname: Hartung
authors.forename: Nicolas
authors.initials: N
authors.lastname: Bucher
authors.forename: Vivek Sahadevan
authors.initials: VS
authors.lastname: Nair
authors.forename: Cheah Yan
authors.initials: CY
authors.lastname: Ling
authors.forename: Yuxi
authors.initials: Y
authors.lastname: Wang
authors.forename: Harry E
authors.initials: HE
authors.lastname: Hoster
authors.forename: Madhavi
authors.initials: M
authors.lastname: Srinivasan
keywords: cathode materials; energy storage; sodium vanadium oxide; sodium-ion batteries; symmetric batteries