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Molten iodide salt electrolyte for low-temperature low-cost sodiumbased liquid metal battery

Gong, Qing and Ding, Wenjin and Bonk, Alexander and Li, Haomiao and Wang, Kangli and Jianu, Adrian and Weisenburger, Alfons and Bund, Andreas and Bauer, Thomas (2020) Molten iodide salt electrolyte for low-temperature low-cost sodiumbased liquid metal battery. Journal of Power Sources, 475 (228674). Elsevier. doi: 10.1016/j.jpowsour.2020.228674. ISSN 0378-7753.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0378775320309782


Using low-melting-point electrolytes could overcome various key challenges of low-cost sodium-based liquid metal batteries (Na-LMBs), e.g. high rates of self-discharge and degradation of structural materials, by lowering their operating temperatures. Molten halide salts are considered promising electrolyte candidates for Na-LMBs due to their high stability and electrical conductivity. In this work, thermodynamic simulation via FactSageTM and thermal analysis via e.g. Differential Scanning Calorimeter (DSC) were carried out to explore the NaI-LiI-KI system, since it could be a promising electrolyte for Na-LMBs due to its low melting point and Na solubility. The results show that the eutectic NaI-LiI-KI performs as a pseudo-binary salt with a melting point of ~290 °C. In this pseudo-binary salt, the solubility of NaI in the eutectic LiI-KI is ~7 mol%. Using the eutectic NaI-LiI-KI electrolyte, Na-LMBs could be operated at < 350 °C. Moreover, the Na solubility and Na+ conductivity of the eutectic NaI-LiI-KI electrolyte, which are vital to the battery performance, were estimated by calculation based on the literature data. Additionally, its applicability and economy were also discussed based on cost pre-analysis of salt materials, salt treatment and structural materials regarding salt corrosivity.

Item URL in elib:https://elib.dlr.de/136608/
Document Type:Article
Additional Information:This research has been performed within the DFG-NSFC Sino-German project (DFG Project Mumber 411450529): ‘Study on Corrosion Control and Low-Temperature Electrolytes for Low-Cost Na-based Liquid Metal Batteries’, which is funded by Deutsche Forschungsgemeinschaft (DFG) and National Natural Science Foundation of China (NSFC).
Title:Molten iodide salt electrolyte for low-temperature low-cost sodiumbased liquid metal battery
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gong, Qingqing.gong (at) dlr.deUNSPECIFIED
Ding, WenjinWenjin.Ding (at) dlr.dehttps://orcid.org/0000-0001-5037-5810
Bonk, AlexanderAlexander.Bonk (at) dlr.deUNSPECIFIED
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:1 November 2020
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jpowsour.2020.228674
Keywords:Differential scanning calorimeter (DSC); Grid-scale energy storage; Halide salt; Na solubility; Na+ ionic conductivity; Pseudo-binary eutectic theory
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Gong, Qing
Deposited On:23 Oct 2020 11:17
Last Modified:04 Dec 2020 15:07

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