Next generation molten NaI batteries for grid scale energy storage
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Ceramatec Inc., Salt Lake City, UT (United States)
Robust, safe, and reliable grid-scale energy storage continues to be a priority for improved energy surety, expanded integration of renewable energy, and greater system agility required to meet modern dynamic and evolving electrical energy demands. We describe here a new sodium-based battery based on a molten sodium anode, a sodium iodide/aluminum chloride (NaI/AlCl3) cathode, and a high conductivity NaSICON (Na1+xZr2SixP3–xO12) ceramic separator. This NaI battery operates at intermediate temperatures (120–180 °C) and boasts an energy density of >150 Wh kg–1. The energy-dense NaI-AlCl3 ionic liquid catholyte avoids lifetime-limiting plating and intercalation reactions, and the use of earth-abundant elements minimizes materials costs and eliminates economic uncertainties associated with lithium metal. Moreover, the inherent safety of this system under internal mechanical failure is characterized by negligible heat or gas production and benign reaction products (Al, NaCl). Scalability in design is exemplified through evolution from 0.85 to 10 Ah (28 Wh) form factors, displaying lifetime average Coulombic efficiencies of 99.45% and energy efficiencies of 81.96% over dynamic testing lasting >3000 h. Here, this demonstration promises a safe, cost-effective, and long-lifetime technology as an attractive candidate for grid scale storage.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Electricity Delivery and Energy Reliability (OE)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1465804
- Alternate ID(s):
- OSTI ID: 1550403
- Report Number(s):
- SAND--2017-7034J; 663094
- Journal Information:
- Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: C Vol. 360; ISSN 0378-7753
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Zirconium‐Based Materials for Electrochemical Energy Storage
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journal | February 2019 |
Enhanced alkaline stability in a hafnium-substituted NaSICON ion conductor
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journal | January 2018 |
Electrochemistry of the NaI-AlCl 3 Molten Salt System for Use as Catholyte in Sodium Metal Batteries
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journal | January 2018 |
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