Effect of hexanol-based additives on the performance of positive electrolyte for vanadium redox flow battery

IF 2.6 4区化学 Q3 CHEMISTRY, PHYSICAL

Ionics Pub Date : 2025-07-15 DOI:10.1007/s11581-025-06516-6

Jinjing Du, Haiyang Lin, Ruitong Zhai, Xun Liu, Xinxin Cui, Dongbo Wang, Bin Wang, Jun Zhu, Wendan Tang, Heng Zuo, Qian Li, Xihong He

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Abstract

Vanadium redox flow batteries (VRFBs) are considered a highly promising large-scale energy storage technology due to their long lifespan, high safety, large capacity, and high efficiency. In practical applications, pentavalent vanadium in the positive electrolyte of vanadium batteries is prone to precipitation under conditions of high temperatures and concentrations, reducing the energy density and cycle life of VRFBs. Therefore, choosing appropriate additives to improve the stability of pentavalent vanadium ions is crucial. This study researched the effects of two hexahydric alcohols (inositol and galactitol) as electrolyte additives on the performance of vanadium-positive electrolyte through X-ray diffraction (XRD), Raman spectroscopy, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charge–discharge tests. The results show that both inositol and galactitol can improve the electrochemical performance of vanadium-positive electrolyte. At a current density of 80 mA cm⁻², the energy efficiency of the battery groups with inositol and galactitol added increased by 1.24% and 3.28% respectively compared to the blank battery group. The capacity retention rates of the battery groups with inositol and galactitol added were both higher than that of the blank battery group after 50 cycles. Due to the different distribution spaces of hydroxyl groups, galactitol was more significant in enhancing electrochemical activity and increasing the stability of the electrolyte.

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正醇类添加剂对钒氧化还原液流电池正电解质性能的影响

钒氧化还原液流电池（vrfb）具有长寿命、高安全性、大容量和高效率等优点，被认为是一种极具发展前景的大规模储能技术。在实际应用中，钒电池正极电解液中的五价钒在高温、高浓度条件下容易析出，降低了vrfb的能量密度和循环寿命。因此，选择合适的添加剂来提高五价钒离子的稳定性至关重要。本研究通过x射线衍射（XRD）、拉曼光谱（Raman）、循环伏安（CV）、电化学阻抗谱（EIS）和充放电测试，研究了两种六水醇（肌醇和半乳糖醇）作为电解质添加剂对钒正电解质性能的影响。结果表明，肌醇和半乳糖醇均能改善钒正电解质的电化学性能。在电流密度为80 mA cm−2时，添加肌醇和半乳糖醇的电池组的能量效率分别比空白电池组提高了1.24%和3.28%。循环50次后，添加肌醇和半乳糖醇的电池组容量保持率均高于空白电池组。由于羟基的分布空间不同，半乳糖醇对电解质的电化学活性和稳定性的增强作用更为显著。

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.