木质素磺酸钠对铅酸蓄电池胶体性能的影响

Effects of Sodium Ligninsulfonate as Gelled-electrolyte Additive on the Performance of Gel Valve-regulated Lead-acid Battery

采用不同比例的木质素磺酸钠作为胶体电解质添加剂,探讨其添加前后胶体电解质的物理和电化学性能的变化。粘度测试、老化析水量测试以及循环伏安和交流阻抗分析表明,添加剂能影响胶体粘度,减少老化析水量,提高胶体电化学性能和减少胶体电池内阻。确定添加剂最佳添加量的质量分数为0.005%～0.01%,胶体电解质中气相二氧化硅的适宜质量分数为3.0%。采用UV-V is、FT-IR光谱、TEM和SEM对添加剂和胶体电解质的结构和形貌变化进行了表征。结果表明,添加木质素磺酸钠的胶体电解质形成更为疏松多孔的结构,更有利于离子的传导和电解液的储存。

In order to improve the performance of a gelled electrolyte and decrease its internal resistance, sodium ligninsulfonate was used as an additive to the gelled electrolyte. The properties and electrochemistry of the gelled electrolytes with and without additives were studied by viscosity test, aging test, cyclic voltammetry （CV）, and electrochemical impedance spectroscopy（EIS）. The data indicated that when the mass fraction of SiO2 was 3.0%, the viscosity of the gel electrolyte with 0. 01% additives is increased by 6 times comparing with the gel electrolyte without additives. The volume of precipitated water and the internal resistance of gelled electrolyte decrease as the additive is added. The optimum conditions are obtained. The dosage （mass fraction） of additives is 0. 005% -0. 01%, and the fumed silica is 3.0 %. UV-Vis, FT-IR, SEM and TEM were used to characterize the gelled electrolyte with and without additives. The results show that the microstructure of gelled electrolyte is more porous with improved ion conduction, and the sulphuric acid solution can therefore be stored more easily with addition of sodium liginsulfonate.