NaSICON Prepared by a Solution-Assisted Reaction Shows Enhanced Stability for High-Voltage Aqueous Redox-Flow Batteries

IF 5.4 3区 材料科学 Q2 CHEMISTRY, PHYSICAL
Ibrahim Munkaila Abdullahi, Kang-Ting Tseng, Sanat Vibhas Modak, Zeinab Ismail, Jeff Sakamoto and David G. Kwabi*, 
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Abstract

Sodium superionic conductors (NaSICONs) have garnered considerable attention as ion-exchange membranes in aqueous redox-flow batteries because they can eliminate crossover-induced capacity fade. Two challenges to their practical use are microstructural instability in aqueous solutions and low total conductivity (typically ≤1 mS/cm at room temperature), which causes high cell resistance. In this study, we evaluate the potential for NaSICON synthesized via a solution-assisted solid-state reaction (NZSPSA-SSR) to address these challenges. Upon immersion in a series of neutral pH to strongly alkaline electrolytes, NZSPSA-SSR pellets show a more stable impedance and microstructure over time than conventional NaSICON pellets synthesized from commercially available powder (NZSPCOMM). We observe prominent etching of the glassy phase in NZSPCOMM, whereas the amount of glassy phase in NZSPSA-SSR is negligible. NZSPSA-SSR pellets show no significant change in the microstructure even when exposed to solutions with high (∼1 M) concentrations of K+ ions and strongly oxidizing NaMnO4. We assemble a 1.9 V Zn-MnO4 flow cell containing a NZSPSA-SSR membrane, and it demonstrates good cycling stability for close to 100 h. NZSPSA-SSR also shows promise for accommodating other high-voltage cell chemistries, such as a pH-decoupled NaCrPDTA-NaMnO4 system with an open-circuit potential of ∼1.7 V.

Abstract Image

溶液辅助反应制备的NaSICON显示高压水氧化还原液流电池的稳定性增强
钠超离子导体(NaSICONs)作为离子交换膜在水氧化还原液流电池中引起了广泛的关注,因为它可以消除交叉引起的容量衰减。其实际应用面临的两个挑战是水溶液中的微观结构不稳定和低总电导率(室温下通常≤1 mS/cm),这会导致高细胞电阻。在这项研究中,我们评估了通过溶液辅助固相反应(NZSPSA-SSR)合成NaSICON的潜力,以解决这些挑战。在一系列中性pH值和强碱性电解质中浸泡后,NZSPSA-SSR微球比由市购粉末(NZSPCOMM)合成的传统NaSICON微球表现出更稳定的阻抗和微观结构。我们观察到NZSPCOMM中玻璃相的显著蚀刻,而NZSPSA-SSR中玻璃相的数量可以忽略不计。即使暴露在高(~ 1 M)浓度的K+离子和强氧化的NaMnO4溶液中,NZSPSA-SSR微球的微观结构也没有明显变化。我们组装了一个含有NZSPSA-SSR膜的1.9 V Zn-MnO4流动电池,它显示出接近100小时的良好循环稳定性。NZSPSA-SSR也显示出适应其他高压电池化学物质的希望,例如ph解耦的NaCrPDTA-NaMnO4系统,开路电位为~ 1.7 V。
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来源期刊
ACS Applied Energy Materials
ACS Applied Energy Materials Materials Science-Materials Chemistry
CiteScore
10.30
自引率
6.20%
发文量
1368
期刊介绍: ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.
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