Nanostructured Bilayered Vanadium Oxide Electrodes for Rechargeable Sodium-Ion Batteries

Abstract

Tailoring nanoarchitecture of materials offers unprecedented opportunities in utilization of their functional properties. Nanostructures of vanadium oxide, synthesized by electrochemical deposition, are studied as a cathode material for rechargeable Na-ion batteries. Ex situ and in situ synchrotron characterizations revealed the presence of an electrochemically responsive bilayered structure with adjustable intralayer spacing that accommodates intercalation of Na(+) ions. Sodium intake induces organization of overall structure with appearance of both long- and short-range order, while deintercalation is accompanied with the loss of long-range order, whereas short-range order is preserved. Nanostructured electrodes achieve theoretical reversible capacity for Na(2)V(2)O(5) stochiometry of 250 mAh/g. The stability evaluation during charge-discharge cycles at room temperature revealed an efficient 3 V cathode material with superb performance: energy density of ~760 Wh/kg and power density of 1200 W/kg. These results demonstrate feasibility of development of the ambient temperature Na-ion rechargeable batteries by employment of electrodes with tailored nanoarchitectures.

Pure Single‐Crystalline Na1.1V3O7.9 Nanobelts as Superior Cathode Materials for Rechargeable Sodium‐Ion Batteries

“…It is worth noting that the C–O, OH, C–O(H) peaks enhanced significantly, the analyses of wide scan spectra (Figure S4, Supporting Information) for NVONBs and O 1s demonstrate the formation of a stable SEI layer and chemisorbed water, carbon dioxide molecules, or surface adsorption electrolyte molecules. [[qv: 12b]],15 …”

Effect of post-annealing on structural and electrochromic properties of Mo-doped V2O5 thin films

“…1b. Base-faced square-pyramidal V 2 O 5 units are arranged in parallel with an equal distance (d-spacing), as reported elsewhere [23].…”

β-MnO2 nanorods with exposed tunnel structures as high-performance cathode materials for sodium-ion batteries

“…2 However, the large ionic size of sodium (1.02 Å versus lithium (0.76 Å )) limits the choice of electrode materials for Na-ion batteries. Many cathode materials have been investigated for Na-ion batteries, including phosphate polyanion materials (NaFePO 4 ), 3,4 Na 4 Mn 9 O 18 , [5][6][7] fluoride-based cathode materials-NaMF 3 (M ¼ Fe, Mn, V and Ni), 8,9 fluorophosphates, 10,11 fluorosulfates, 12 À14 and layered transition metal oxides, such as P2-Na x CoO 2 , 15 21,22 and Na x VO 2 . 23 However, none of the above cathode materials showed satisfactory electrochemical performance in terms of specific capacity, cyclability and high-rate capability.…”