Journal
JOURNAL OF POWER SOURCES
Volume 396, Issue -, Pages 297-303Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.06.039
Keywords
Stationary energy storage; Na battery; Solid-state electrolyte; Na-metal halide battery; Bi-layer composite
Funding
- U.S. Department of Energy Office of Electricity Delivery and Energy Reliability [70247]
- International Collaborative Energy Technology R&D Program of the Korea Institute of Energy Technology Evaluation and Planning - Ministry of Trade, Industry, and Energy [20158510050010]
- POSCO, the Republic of Korea
- DOE [DE-AC05-76RL01830]
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Sodium metal halide (Na-MH) batteries present tremendous opportunities for grid scale energy storage applications. In this work, we describe an advanced Na-MH battery operating at 190 degrees C using a bi-layer (thin dense/ thick porous layers) beta-alumina solid-state electrolyte (BASE). The novel design of the bi-layer BASE promotes high Na-ion transportation by reducing the Na+ ion path length. The excellent battery performances are achieved with a stable capacity retention of 350 W h/kg up to > 350 cycles (similar to 6 months). Moreover, owing to the thin dense layer of BASE, the round trip energy efficiency (or discharging energy density) of the tested battery shows an similar to 8% increase compared to that of state of the art Na-MH battery reported in the literature. Results from this work clearly demonstrate that advanced Na-MH batteries using bi-layer BASEs can have significant impacts on improving battery performances at lower operating temperatures, and further stretch its feasibility in stationary energy storage applications.
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