一个通用库伦比效率补偿策略用于基于的流电池
Shiqiang Huang1, Mengxiao Li1, Yuxi Song1
1Department of Materials Science and Engineering, National University of Singapore, Singapore, 117576, Singapore.
Advanced materials (Deerfield Beach, Fla.)
|June 13, 2024
概括
性铁流电池 (AZIFB) 通过使用氧演变反应 (OER) 来弥补库伦比效率 (CE) 的损失,从而实现了改进的循环. 这一战略提高了电池的寿命和稳定性,用于储能应用.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 性铁流电池 (AZIFB) 提供安全,低成本的能源存储.
- 无法逆转的阳极寄生反应降低了AZIFB的协同效率 (CE) 和循环性能.
- 不平衡的阴解质/阳解质电荷状态和pH值波动是关键问题.
研究的目的:
- 为AZIFBs制定一个普遍的CE补偿策略.
- 为了解决coulombic效率损失和提高循环稳定性.
- 为了减轻寄生反应和pH不平衡.
主要方法:
- 采用了在正极侧利用氧演化反应 (OER) 的CE补偿策略.
- 在电极上通过电化学方法或通过外部反应器的氧还原介导过程实现了OER.
- 该策略在循环过程中消耗了多余的氧化离子 (OH-),以抵消寄生虫反应.
主要成果:
- 该策略有效地平衡了阴极酸/阳极酸电荷状态,并抵消了pH值波动.
- [Fe(CN) 6-3和[Zn(OH) 4-2的积累受到缓解.
- 在80%的SOC下,AZIFB在600个周期中表现出异常的循环稳定性,容量衰减率为0.0128%/天,超过80%的SOC.
结论:
- 以OER为中心的CE补偿策略显著提高了AZIFB的自行车性能.
- 这种方法为AZIFBs中的coulombic效率损失提供了可行的解决方案.
- 该策略可能适用于其他遭受水/氧诱导寄生反应的电池技术.
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