title: Rechargeable Sodium-Ion Battery: High-Capacity Ammonium Vanadate Cathode with Enhanced Stability at High Rate.
abstract: Sodium-ion battery (NIB) cathode performance based on ammonium vanadate is demonstrated here as having high capacity, long cycle life and good rate capability. The simple preparation process and morphology study enable us to explore this electrode as suitable NIB cathode. Furthermore, density functional theory (DFT) calculation is envisioned for the NH4V4O10 cathode, and three possible sodium arrangements in the structure are depicted for the first time. Relevant NIB-related properties such as average voltage, lattice constants, and atomic coordinates have been derived, and the estimated values are in good agreement with the current experimental values. A screening study shows ammonium vanadate electrodes prepared on carbon coat onto Al-current collector exhibits a better electrochemical performance toward sodium, with a sustained reversible capacity and outstanding rate capability. With the current cathode with nanobelt morphology, a reversible capacity of 190 mAh g(-1) is attained at a charging rate of 200 mA g(-1), and a stable capacity of above 120 mAh g(-1) is retained for an extended 50 cycles tested at 1000 mA g(-1) without the addition of any expensive electrolyte additive.
authors.affiliation: †Electrochemical Energy Laboratory, Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India.
authors.forename: Ananta
authors.initials: A
authors.lastname: Sarkar
authors.affiliation: †Electrochemical Energy Laboratory, Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India.
authors.forename: Sudeep
authors.initials: S
authors.lastname: Sarkar
authors.affiliation: ‡Center for Study of Science, Technology and Policy, 18, 10th Cross, Mayura Street, Papanna Layout, Nagashettyhalli, RMV II Stage, Bangalore 560094, Karnataka India.
authors.forename: Tanmay
authors.initials: T
authors.lastname: Sarkar
authors.affiliation: ‡Center for Study of Science, Technology and Policy, 18, 10th Cross, Mayura Street, Papanna Layout, Nagashettyhalli, RMV II Stage, Bangalore 560094, Karnataka India.
authors.forename: Parveen
authors.initials: P
authors.lastname: Kumar
authors.affiliation: ‡Center for Study of Science, Technology and Policy, 18, 10th Cross, Mayura Street, Papanna Layout, Nagashettyhalli, RMV II Stage, Bangalore 560094, Karnataka India.
authors.forename: Mridula Dixit
authors.initials: MD
authors.lastname: Bharadwaj
authors.affiliation: †Electrochemical Energy Laboratory, Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India.
authors.forename: Sagar
authors.initials: S
authors.lastname: Mitra
keywords: ab initio modeling study; ammonium vanadate; cyclic stability; power performance; sodium ion battery cathode