Primary aluminum-air flow battery for high-power applications: Optimization of power and self-discharge

IF 2.9 Q2 ELECTROCHEMISTRY Journal of Electrochemical Science and Engineering Pub Date : 2023-11-14 DOI:10.5599/jese.2075
Dayatri Bolaños-Picado, Cindy Torres, Diego González-Flores
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Abstract

Aluminum-air batteries are a front-runner technology in applications requiring a primary energy source. Aluminum-air flow batteries have many advantages, such as high energy density, low price, and recyclability. One of the main challenges with aluminum-air batteries is achieving high power while parasitic corrosion and self-discharge are minimized. In this study, the optimization of an aluminum-air flow cell by multiple-parameters analysis and integration of a four-cell stack are shown. We also studied the incorporation of ammonium metavanadate (NH4VO3) as anticorrosive in 4 mol L-1 KOH electrolyte by discharge and polarization plots. It was concluded that NH4VO3 is an efficient anticorrosive at low currents, but it limits the battery reaction at high-current and high-power applications. Nevertheless, high currents inhibit the corrosion reaction using 4 mol L-1 KOH electrolyte, allowing high power and capacity without anticorrosive additives. The flow in the stack also plays a significant role, and parallel flow is suggested over cascade flow since the latter results in the progressive accumulation of hydrogen as the electrolyte flows through the stack.
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大功率应用的原铝-空气液流电池:优化功率和自放电
铝-空气电池在需要一次能源的应用中是一项领先的技术。铝-空气液流电池具有能量密度高、价格低廉、可回收利用等优点。铝空气电池面临的主要挑战之一是在最小化寄生腐蚀和自放电的同时实现高功率。在本研究中,通过多参数分析和集成四电池堆来优化铝-空气流电池。我们还通过放电和极化图研究了偏氰酸铵(NH4VO3)在4 mol L-1 KOH电解液中的防腐作用。结果表明,NH4VO3在低电流下是一种有效的防腐蚀剂,但在大电流和大功率应用时,它限制了电池的反应。然而,使用4 mol L-1 KOH电解液时,大电流抑制腐蚀反应,无需防腐添加剂即可实现高功率和高容量。堆内的流动也起着重要的作用,建议采用平行流动而不是叶栅流动,因为后者会导致电解质流过堆时氢气的逐渐积累。
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来源期刊
CiteScore
3.60
自引率
27.30%
发文量
90
审稿时长
6 weeks
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