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A Low‐Cost Durable Na‐FeCl2 Battery with Ultrahigh Rate Capability
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-01-30 , DOI: 10.1002/aenm.201903472
Xiaowen Zhan 1 , Mark E. Bowden 2 , Xiaochuan Lu 1 , Jeffery F. Bonnett 1 , Teresa Lemmon 3 , David M. Reed 1 , Vincent L. Sprenkle 1 , Guosheng Li 1
Affiliation  

Na‐based batteries have long been regarded as an inexpensive, sustainable candidate for large‐scale stationary energy storage applications. Unfortunately, the market penetration of conventional Na‐NiCl2 batteries is approaching its limit for several reasons, including limited rate capability and high Ni cost. Herein, a Na‐FeCl2 battery operating at 190 °C is reported that allows a capacity output of 116 mAh g−1 at an extremely high current density of 33.3 mA cm−2 (≈0.6C). The superior rate performance is rooted in the intrinsically fast kinetics of the Fe/Fe2+ redox reaction. Furthermore, it is demonstrated that a small amount of Ni additive (10 mol%) effectively mitigates capacity fading of the Fe/NaCl cathode caused by Fe particle pulverization during long‐term cycling. The modified Fe/Ni cathode exhibits excellent cycling stability, maintaining a discharge energy density of over 295 Wh kg−1 for 200 cycles at 10 mA cm−2 (≈C/5).

中文翻译:

具有超高倍率能力的低成本耐用Na-FeCl2电池

钠基电池长期以来一直被认为是大规模固定式能量存储应用的廉价,可持续的候选产品。不幸的是,传统的Na-NiCl 2电池的市场渗透率正接近其极限,原因有几个,包括速率能力有限和高镍成本。在此,据报道,Na-FeCl 2电池在190°C下工作,在33.3 mA cm -2(≈0.6C)的极高电流密度下,其容量输出为116 mAh g -1。优异的速率性能源于Fe / Fe 2+固有的快速动力学氧化还原反应。此外,事实证明,少量的镍添加剂(10摩尔%)可有效减轻长期循环过程中由于铁颗粒粉碎而引起的铁/氯化钠阴极容量下降。修改后的铁/镍阴极表现出优异的循环稳定性,保持超过295瓦公斤的放电能量密度-1为200次循环在10mA厘米-2(≈ ç / 5)。
更新日期:2020-03-10
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