增塑剂DBP对PVDF-HFP聚合物膜性能的影响

Effects of plasticizer DBP on performance of polymer membrane PVDF-HFP

采用Bellcore制膜法制备了锂离子电池用PVDF-HFP共聚物型多孔聚合物隔膜;研究了增塑剂DBP对该聚合物膜的离子电导率、电化学稳定窗口的影响.研究表明,随增塑剂含量增大,离子电导率不断提高,在增塑剂与溶剂体积比大于等于20%时,离子电导率可达10^-3S·cm^-1;在增塑剂与溶剂体积比为10%～30%时,该聚合物膜的电化学稳定窗口在4.3 V以上,均能满足锂离子电池的要求,并且随增塑剂含量的增大,电化学稳定窗口先增大后减小,在比值为20%时达到最大,为5.3 V左右.

By means of Bellcore, the microporous polymer separators PVDF-HFP used in lithium-ion batteries are prepared. And the effects of plasticizer DBP on the performance of polymer membrane PVDF-HFP,including the ion conductivity and the electro-chemical stability window. The results show that the larger the quantity of DBP, the higher the ion conductivity, and the ion conductivity arrived 10^-3S·cm^-1 when the volume ratio of DBP to solvent is more than 1：5 ;When the volume ratio of DBP to solvent is 1：10 to 3： 10,the electro-chemical stability window of PVDF-HFP is above 4.3 V, it obviously can satisfy the requirement of lithiumion battery, meanwhile, the electro-chemical stability window first larger then lower as the quantity of DBP increasing,when the ratio is 1 ： 5,it arrived the largest, almost 5.3 V.