β-NaMnO2: a High Performance Cathode for Sodium-Ion Batteries
Clément, Raphaële J
Armstrong, A Robert
Bruce, Peter G
Journal of the American Chemical Society
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Billaud, J., Clément, R. J., Armstrong, A. R., Canales-Vázquez, J., Rozier, P., Grey, C., & Bruce, P. G. (2014). β-NaMnO2: a High Performance Cathode for Sodium-Ion Batteries. Journal of the American Chemical Society, 136 17243-17248. https://doi.org/10.1021/ja509704t
There is much interest in Na-ion batteries for grid storage because of the lower projected cost compared with Li-ion. Identifying Earth abundant, low cost and safe materials that can function as intercalation cathodes in Na-ion batteries is an important challenge facing the field. Here we investigate such a material, β-NaMnO2, with a different structure from that of NaMnO2 polymorphs and other compounds studied extensively in the past. It exhibits a high capacity (of ca. 190 mA h g-1 at a rate of C/20), along with a good rate capability (142 mA h g-1 at a rate of 2C) and a good capacity retention (100 mA h g-1after 100 Na extraction/insertion cycles at a rate of 2C). Powder XRD, HRTEM and 23Na NMR studies revealed that this compound exhibits a complex structure consisting of intergrown regions of β-NaMnO2 and β-NaMnO2 domains. The collapse of the long-range structure at low Na content is expected to compromise the reversibility of the Na extraction and insertion processes occurring upon charge and discharge of the cathode material, respectively. Yet stable, reproducible and reversible Na intercalation is observed.
Sodium-Ion Battery, High performance, Rate capability, Solid-State NMR
RJC acknowledges support from the European Research Council (ERC). PGB acknowledges support from EPSRC including the SUPERGEN programme. JCV is grateful to MAT2010-19837-C06-C04 for funding.
UNIVERSITY OF OXFORD (FB EPSRC) (EP/L019469/1)
EPSRC (via Imperial College London) (EP/K002252/1)
External DOI: https://doi.org/10.1021/ja509704t
This record's URL: https://www.repository.cam.ac.uk/handle/1810/247476