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β-NaMnO2: A High-Performance Cathode for Sodium-Ion Batteries

Billaud, Juliette and Clément, Raphaële J. and Armstrong, A. Robert and Canales-Vázquez, Jesús and Rozier, Patrick and Grey, Clare P. and Bruce, Peter G. β-NaMnO2: A High-Performance Cathode for Sodium-Ion Batteries. (2014) Journal of the American Chemical Society, 136 (49). 17243-17248. ISSN 0002-7863

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Official URL: 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 α-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.

Item Type:Article
HAL Id:hal-02057698
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Universidad de Castilla-La Mancha - UCLM (SPAIN)
Other partners > University of Cambridge (UNITED KINGDOM)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > University of St Andrews (UNITED KINGDOM)
Other partners > University of Oxford (UNITED KINGDOM)
Laboratory name:
Deposited On:05 Mar 2019 14:15

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