红外干燥条件下水基锂电池正极涂层黏结剂分布

Distribution of Binder for Cathode Coating of Water-based Lithium-ionbattery under the Condition of Infrared Drying

为探究迁移控制干燥动力学理论在红外辐射干燥条件下的适用性,在红外辐射条件下对水基锂电池正极涂层进行了干燥,应用迁移控制干燥动力学理论对极片内部黏结剂分布规律进行了分析,通过热重分析仪(thermogravimetric analyzer,TGA)对理论分析进行了检验,并使用透反偏光显微镜观察了极片涂层的上、下表面形态,应用百格刀对比了不同干燥条件下极片的力学性能。结果表明:黏结剂分布的理论计算结果与TGA实验数据及显微镜观察结果吻合,说明红外干燥条件下极片内部黏结剂分布符合迁移控制干燥动力学理论,在水分迁移的带动下涂层中黏结剂含量随着距离基材距离的增大而增大。同时,结合力学性能结果和干燥能耗水平显示,在辐射功率为200 W,辐射距离为13 cm时干极片具有较好的力学性能和经济效益。

In order to explore the applicability of migration control drying kinetics theory in the condition of infrared radiation drying,the positive electrode coating of water-based lithium battery was dried under the condition of infrared radiation.The distribution of binder inside the electrode sheet was analyzed by using the migration control drying kinetics theory.The theoretical analysis was verified by thermogravimetric analyzer(TGA)comprehensive thermal analyzer.The results show that the theoretical calculation results of binder distribution are consistent with the experimental data of TGA and the observation results of microscope,indicating that the distribution of binder in the electrode sheet conforms to the theory of migration control drying kinetics under the condition of infrared drying.Drived by water migration,the content of binder in the coating increases with the increase of the distance from the substrate.At the same time,combining with the results of mechanical properties and drying energy consumption level,the dry electrode plate has better mechanical properties and economic benefits when the radiation power is 200 W and the radiation distance is 13 cm.