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SiO,胶体电解液分散稳定性研究
王力臻，程苏，谷书华，高海丽
（郑州轻工业学院材料与化学工程学院，河南郑州450002）
摘要：利用重力况降、SEM、粒径分布和正交试验研究了SiO,胶体电解液的分散稳定性。结果表明：阴离子分散剂A的质量分数在0.005%~0.1%时对气相SiO具有较好的分散稳定性，增加搅择速率或搅拌时间可以提高SiO，分散稳定性。正交试验结果可以得出，在试验范围内，影响SiO，分散稳定性的主要因素是酸密度，其次是搅拌时间、搅拌速率和分散剂。按通过正交
优化得出的SiO,分散工艺配制得到的SiO,分散体系的重力况降高度为0.2mm。关键词：胶体电解液，稳定性；分散剂；正交试验
中图分类号：TM912.9
文献标识码：A
文章编号：1006-0847(2013)03-112-06
Study on dispersion stability of gelled electrolyteof fumed silica
WANG Li-zhen, CHENG Su, GU Shu-hua, GAO Hai-li
(Collegeof MaterialandChemicaiEngieering,ZhengzhouUniversityof Light Industry,
zhengzhouHenan450002,China)
Abstract: The dispersion stability of gelled electrolyte of fumed silica was studied by gravity settling. SEM, particle size distribution and orthogonal test. The results showed that the dispersion stability of fumed silica was good when the percentage of anionic dispersant A was from 0.005 % to 0.1 %; increasing the stirring speed or mixing time could improve the dispersion stability of fumed silica Orthogonal test results showed what affected the dispersion stability of fumed silica was proportion of acid, and then mixing time, stirring speed and dispersants in the test range. The gravity settling height of dispersion system of fumed silica that was obtained by the dispersing technology of fumed silica via orthogonal experiment was 0.2 mm
Key words: gelled electrolyte; stability; dispersant; orthogonal test
0引言
胶体电解液可实现蓄电池的密封免维护，同时还可以防止酸雾挥发、漏酸，抑制正极活性物质脱
收稿日期：2013-01-14 12
万方数据
落和负极的不可逆硫酸盐化，降低蓄电池自放电，提高蓄电池循环寿命特别是低温充放电性能[1-5] 在某些特殊要求的地方，改善和拓展了铅酸蓄电池的应用。中国胶体的制备大致经历了中和法、硅溶胶发、气相SiO,法三个阶段(68)。由于气相SiO,非常纯净，气相SiOz法制得的胶体凝胶性和触变性强，采用此种方法制得的胶体蓄电池具有较好的电化学性能。但作为胶体电解液凝胶剂的气相SiO，