Abstract: A sodium styrene sulfonate(SSS) was copolymerized with methoxypoly (ethylene glycol) methacrylate (MPEGMA) to produce the dispersants for LiFePO₄ lithium ion battery coatings. Taking the weight of acrylic acid as a benchmark, the orthogonal experiment was used to optimize the formulation of dispersant which comprised acrylic acid (AA)100%,maleic anhydride ( MA)10%, butyl acrylate(BA)6%, sodium styrene sulfonate(SSS)10% and methoxypoly ( ethylene glycol) methacrylate (MPEGMA)60%. The effect of dispersant concentration on the rheological property of coatings was studied. The result showed that acoatings system with solid content 77. 1% comprising dispersant 0. 3%(based on weight of LiFePO₄) could give its initial viscosity 1 332 mPa.s, and 1 656 mPa.s after storage for 90 min, which was qualified to coating process of battery.

Key words: battery coatings, dispersants; rheological property

摘要： 针对电池涂料涂布要求,由苯乙烯磺酸钠、甲氧基聚乙二醇甲基丙烯酸酯等单体共聚合成了磷酸铁锂锂离子电池涂料分散剂。通过正交试验法对配料比进行优化,最佳配比(以丙烯酸为基准计算)为:丙烯酸100%、马来酸酐10%、丙烯酸丁酯6%、苯乙烯磺酸钠10%、甲氧基聚乙二醇甲基丙烯酸酯60%。在最优配料比条件下合成该分散剂,进一步探讨了分散剂用量对涂料流变性影响,结果表明:固含量为77.1%,分散剂用量为活性物质磷酸铁锂质量的0.3%时,涂料初始黏度为1 332 m Pa·s,静置90 min后黏度为1 656 m Pa·s,符合电池涂布工艺要求。

关键词: 电池涂料, 分散剂, 流变性