电解液流速对锌镍单液流电池性能的影响

发布时间：2018-05-04 10:14

本文选题：锌镍单液流电池 + 锌电沉积　；参考：《高等学校化学学报》2014年01期

【摘要】：通过电化学测试、扫描电子显微镜观察和X射线衍射分析研究了电解液流速、电流密度和锌沉积面容量三者关系及对锌镍单液流电池充放电性能和负极锌沉积形貌的影响.结果表明,锌沉积面容量是影响锌镍单液流电池充放电效率和负极锌沉积形貌的最主要因素,电解液流速不宜过高或过低.随着锌沉积面容量的增大,电池的充放电效率和循环稳定性对电流密度的变化更为敏感,适宜的电解液流速范围变窄.锌沉积面容量在25 mA·h/cm2以上,锌沉积皆呈海绵状.在较低锌沉积面容量下,电解液流速也较低时,海绵锌沉积较为均匀致密.而在高的锌沉积面容量下,海绵状锌沉积的团簇和颗粒变大,不均匀性加重,仅在适中的电解液流速(7.1 L/min)下,锌沉积部分致密规整,电池具有较好的充放电性能.
[Abstract]:The relationship among electrolyte flow rate, current density and zinc deposition surface capacity was studied by electrochemical measurement, scanning electron microscopy and X-ray diffraction analysis. The results show that the capacity of zinc deposition surface is the most important factor that affects the charge and discharge efficiency and the morphology of zinc deposition of zinc nickel single flow battery. The electrolyte flow rate should not be too high or too low. With the increase of zinc deposition surface capacity, the charge / discharge efficiency and cycle stability of the battery are more sensitive to the change of current density, and the suitable electrolyte flow rate range is narrowed. Zinc deposition surface has a capacity of more than 25 Ma h/cm2, and zinc deposition is spongy. Under the condition of low zinc deposition surface capacity and low electrolyte flow rate, sponge zinc deposition is more uniform and compact. However, at high zinc deposition surface capacity, the clusters and particles of spongy zinc deposition become larger, and the inhomogeneity is aggravated. Only at the moderate electrolyte flow rate of 7.1 L / min, the zinc deposition is partially compact and regular, and the battery has better charge-discharge performance.
【作者单位】：北京化工大学理学院;北京防化研究院;
【基金】：国家“九七三”计划项目(批准号:2010CB227201)资助~~
【分类号】：TM911.4

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