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一个通用添加剂设计策略,以调节溶解结构和键网络,以实现低温全铁流电池的高可逆Fe极

Jing Yang^1,2, Hui Yan^1,2, Qi-An Zhang¹

¹Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110000, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|October 11, 2023

概括

一种新的电解质添加剂N,N-Dimethylacetamide (DMAc) 增强了全铁氧化还原流电池 (RFB),用于低温储能. 这种添加剂可确保稳定,无树铁阳极,在寒冷条件下提高性能.

科学领域:

电化学和材料科学材料科学
可再生能源储能技术可再生能源储能技术

背景情况:

水性全铁氧化还原流电池 (RFB) 是电网规模储能的关键.
在更广泛的温度范围内,性能限制是由于铁阳极涂层/脱落不良以及过渡温度低而造成的.
现有的挑战阻碍了全铁RFB在不同气候中的实际应用.

研究的目的:

开发一种通用电解质添加剂策略,以提高全铁RFB在低温下的性能.
为了使全铁RFB中具有高度可逆性和无树的铁阳极运行.
为了克服当前全铁RFB技术的温度依赖性限制.

主要方法:

量子化学计算被用来选潜在的有机电解质添加剂.
N,N-Dimethylacetamide (DMAc) 根据其特性和相互作用被确定并选择.
实验性表征和理论计算证实了DMAc对铁阳极和电解质的影响.

主要成果:

添加DMAc重新塑造了Fe2+溶解,并破坏了水的结网,提高了Fe/Fe2+的可逆性.
修改后的电解质表现出较低的结点,这对于低温操作至关重要.
全铁RFB表现出高功率密度 (25mW cm-2),卓越的循环稳定性 (95.59%的保留时间超过103小时) 和95%的库伦比效率在-20°C.

结论:

DMAc添加剂策略成功地解决了全铁RFB的低温性能问题.
这种方法促进了无树和高度可逆的铁阳极,这对电池的寿命和效率至关重要.
这些发现为全铁RFB在电网规模储能中的更广泛温度范围应用铺平了道路.

关键词:

铁的阳极是铁的阳极.添加剂设计的设计方法通过键相互作用的相互作用.在低温的低温下.溶解结构是一种溶解结构.

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