Journal of Power Sources ( IF 9.2 ) Pub Date : 2018-06-14 , DOI: 10.1016/j.jpowsour.2018.06.039 Keeyoung Jung , Hee-Jung Chang , Jeffery F. Bonnett , Nathan L. Canfield , Vincent L. Sprenkle , Guosheng Li
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 °C using a bi-layer (thin dense/thick porous layers) β″-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 (∼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 ∼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.
中文翻译:
使用双层(致密/微孔)β“-氧化铝固态电解质的高级Na-NiCl 2电池
金属卤化钠(Na-MH)电池为电网规模的储能应用提供了巨大的机会。在这项工作中,我们描述了一种使用双层(薄致密/厚多孔层)β''-氧化铝固态电解质(BASE)在190°C下运行的高级Na-MH电池。双层BASE的新颖设计通过减少Na +促进了高Na离子运输离子路径长度。在超过350次循环(约6个月)时,以350 W h / kg的稳定容量保持能力,可实现出色的电池性能。而且,由于BASE的致密层薄,与文献中报道的现有技术的Na-MH电池相比,被测电池的往返能量效率(或放电能量密度)显示出约8%的增长。这项工作的结果清楚地表明,使用双层BASE的高级Na-MH电池可对在较低工作温度下改善电池性能产生重大影响,并进一步扩大了其在固定式储能应用中的可行性。