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Issue 15, 2019
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A compatible anode/succinonitrile-based electrolyte interface in all-solid-state Na–CO2 batteries

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Abstract

All-solid-state sodium batteries have great potential for large-scale energy storage applications. However, constructing a compatible Na anode/solid-state electrolyte (SSE) interface is still challenging because most SSEs are unstable toward Na metal. A succinonitrile (SN) SSE shows high room-temperature ionic conductivity (10−3 S cm−1) but easily deteriorates if in contact with Na metal, leading to continuously increased interfacial resistance. Here we present an extremely simple approach to introduce a compact NaF-rich interphase on a Na surface via chemical reactions between fluoroethylene carbonate–Na+ and Na metal, resulting in a compatible Na anode/SN-based electrolyte interface. The in situ formed NaF-rich interphase can not only prevent side reactions between the SN-based electrolyte and Na anode but also regulate the uniform deposition of dendrite-free Na. As a result, the symmetric cells show a low overpotential of 150 mV after cycling for 4000 h. Furthermore, all-solid-state Na–CO2 batteries (4Na + 3CO2 ↔ 2Na2CO3 + C) with the compatible interface can run for 50 cycles with a small overpotential increase of 0.33 V. This work provides a promising method to build a stable interface that enables the use of an SSE which is unstable toward Na in Na metal batteries.

Graphical abstract: A compatible anode/succinonitrile-based electrolyte interface in all-solid-state Na–CO2 batteries

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Publication details

The article was received on 20 Nov 2018, accepted on 08 Mar 2019 and first published on 12 Mar 2019


Article type: Edge Article
DOI: 10.1039/C8SC05178J
Chem. Sci., 2019,10, 4306-4312
  • Open access: Creative Commons BY-NC license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    A compatible anode/succinonitrile-based electrolyte interface in all-solid-state Na–CO2 batteries

    Y. Lu, Y. Cai, Q. Zhang, L. Liu, Z. Niu and J. Chen, Chem. Sci., 2019, 10, 4306
    DOI: 10.1039/C8SC05178J

    This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

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