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Quasi-solid-state electrolyte for rechargeable high-temperature molten salt iron-air battery

Zhang, Shiyu; Yang, Yun; Cheng, Liwei; Sun, Jian; Wang, Xiaomei; Nan, Pengfei; Xie, Chaomei; Yu, Haisheng; Xia, Yuanhua; Ge, Binghui; Lin, Jun; Zhang, Linjuan; Guan, Chengzhi; Xiao, Guoping; Peng, Cheng; Chen, George Zheng; Wang, Jian Qiang


Shiyu Zhang

Yun Yang

Liwei Cheng

Jian Sun

Xiaomei Wang

Pengfei Nan

Chaomei Xie

Haisheng Yu

Yuanhua Xia

Binghui Ge

Jun Lin

Linjuan Zhang

Chengzhi Guan

Guoping Xiao

Cheng Peng

Jian Qiang Wang


© 2020 Elsevier B.V. Molten salts are a unique type of electrolyte enabling high-temperature electrochemical energy storage (EES) with unmatched reversible electrode kinetics and high ion-conductivities, and hence impressive storage capacity and power capability. However, their high tendency to evaporate and flow at high temperatures challenges the design and fabrication of the respective EES devices in terms of manufacturing cost and cycling durability. On the other hand, most of these EES devices require lithium-containing molten salts as the electrolyte to enhance performances, which not only increases the cost but also demands a share of the already limited lithium resources. Here we report a novel quasi-solid-state (QSS) electrolyte, consisting of the molten eutectic mixture of Na2CO3-K2CO3 and nanoparticles of yttrium stabilized zirconia (YSZ) in a mass ratio of 1:1. The QSS electrolyte has relatively lower volatility in comparison with the pristine molten Na2CO3-K2CO3 eutectic, and therefore significantly suppresses the evaporation of molten salts, thanks to a strong interaction at the interface between molten salt and YSZ nanoparticles at high temperatures. The QSS electrolyte was used to construct an iron-air battery that performed excellently in charge-discharge cycling with high columbic and energy efficiencies. We also propose and confirm a redox mechanism at the three-phase interlines in the negative electrode. These findings can help establish a simpler and more efficient approach to designing low-cost and high-performance molten salt metal-air batteries with high stability and safety.


Zhang, S., Yang, Y., Cheng, L., Sun, J., Wang, X., Nan, P., …Wang, J. Q. (2021). Quasi-solid-state electrolyte for rechargeable high-temperature molten salt iron-air battery. Energy Storage Materials, 35, 142-147.

Journal Article Type Article
Acceptance Date Nov 9, 2020
Online Publication Date Nov 17, 2020
Publication Date Mar 1, 2021
Deposit Date Nov 23, 2020
Publicly Available Date Nov 18, 2021
Journal Energy Storage Materials
Print ISSN 2405-8297
Electronic ISSN 2405-8297
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 35
Pages 142-147
Public URL
Publisher URL
Additional Information This article is maintained by: Elsevier; Article Title: Quasi-solid-state electrolyte for rechargeable high-temperature molten salt iron-air battery; Journal Title: Energy Storage Materials; CrossRef DOI link to publisher maintained version:; Content Type: article; Copyright: © 2020 Elsevier B.V. All rights reserved.


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