Thermally Stable Positive Electrolytes with a Superior Performance in All-Vanadium Redox Flow Batteries
Thermally Stable Positive Electrolytes with a Superior Performance in All-Vanadium Redox Flow Batteries
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DOI：
10.1002/cplu.201402336
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发表时间：
2015-02-01
期刊：
影响因子：
3.4
通讯作者：
Morante, Joan Ramon
中科院分区：
文献类型：
--
作者：
Flox, Cristina;Rubio-Garcia, Javier;Morante, Joan Ramon
本文报道了一种新型全钒液流电池正极电解液配方，该配方的电化学性能得到了显著改善。一个5 kDa的聚（乙烯亚胺）为基础的树枝状聚合物（dPEI）表现出增强的性能时，用作添加剂的正极电解质在VFRB。在40 ℃下的热稳定性测试表明，dPEI添加剂在720小时内防止VO 2+沉淀。dPEI添加剂的最佳浓度低至0.6%（重量/体积电解质），导致相对于无添加剂系统（约100%）在能量密度（18 Wh L-1）方面增加38%的成本有效的解决方案。13Wh L-1）。此外，这种创新的电解质性能在更宽的工作温度（高达60摄氏度）下保持稳定在88%的能源效率，同时保持能量密度。
A new positive electrolyte formulation for all-vanadium redox flow batteries (VFRB) with a significant improvement in electrochemical properties is reported in this communication. A 5 KDa poly(ethyleneimine)-based dendrimer (dPEI) demonstrates enhanced performance when used as an additive for positive electrolytes in VFRB. A thermal stability test at 40 degrees C shows that the dPEI additive prevents the precipitation of VO2+ over 720 h. The optimum concentration of the dPEI additive was as low as 0.6% (weight per volume of electrolyte), leading to a cost-effective solution in terms of a 38% increase in energy density (18 Wh L-1) with respect to the additive-free system (ca. 13 Wh L-1). Moreover, this innovative electrolyte performance remains stable at 88% in energy efficiency over a wider operational temperature (up to 60 degrees C) while retaining the energy density.