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Issue 2, 2018
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Reversible anionic redox activity in Na3RuO4 cathodes: a prototype Na-rich layered oxide

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Abstract

Sodium-ion batteries are attractive for large-scale energy storage due to the abundance of sodium, but the deficient capacity achieved by cathode materials prevents their further applications. Chemical substitution of Na in transition metal layers is a promising solution to utilize both the cationic and anionic redox activities for boosting energy storage. Unfortunately, different from the classic Li-rich Li2MnO3, a pure prototype with anionic redox activity has not been found among the typical Na-rich cathodes. Herein, we originally design a Na-rich layered oxide prototype, namely Na3RuO4 (Ru5+), which delivers a partial reversible capacity solely via the participation of oxygen anions. More importantly, the anionic redox activity is validated by the in situ Raman observation of reversible peroxo-based O–O (de)bonding upon cycling. Our findings not only highlight the multiple electron-transfer strategy for capacity extension, but also broaden the horizon in designing Na-rich electrode materials for high-energy sodium-ion batteries.

Graphical abstract: Reversible anionic redox activity in Na3RuO4 cathodes: a prototype Na-rich layered oxide

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Article information


Submitted
15 Dec 2017
Accepted
11 Jan 2018
First published
26 Jan 2018

Energy Environ. Sci., 2018,11, 299-305
Article type
Communication

Reversible anionic redox activity in Na3RuO4 cathodes: a prototype Na-rich layered oxide

Y. Qiao, S. Guo, K. Zhu, P. Liu, X. Li, K. Jiang, C. Sun, M. Chen and H. Zhou, Energy Environ. Sci., 2018, 11, 299
DOI: 10.1039/C7EE03554C

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