增强型P(VDF-HFP)-PMMA聚合物电解质的制备和性能  

Preparation and Performance of Reinforced P(VDF-HFP)-PMMA Polymer Electrolyte

作　　者：张国庆[1] 马莉[1] 倪佩 陈雨婷[1] 刘元刚 

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]东莞迈科科技有限公司,广东东莞523800

出　　处：《材料科学与工程学报》2008年第5期700-702,723,共4页Journal of Materials Science and Engineering

摘　　要：以P(VDF-HFP)-PMMA(聚四氟乙烯六氟丙烯-聚甲基丙烯酸甲酯)为聚合物基体,利用直接挥发法制备了PP/PE/PP复合膜增强型聚合物电解质。采用激光扫描共焦显微镜(LEXT),线性伏安,交流阻抗和恒流充放电循环等测试手段,考察了PMMA的添加对聚合物电解质性能的影响。实验结果表明:PMMA的加入能使聚合物电解质吸收更多的液体电解液,从而增大离子电导率。当P(VDF-HFP)∶PMMA=1时,室温下吸液量高达306%,电导率达到1.63 mS/cm,电化学稳定窗口高达5.2V。以LiCoO2为正极、锂片为负极,采用该隔膜组装的聚合物锂离子电池具有很好的循环稳定性。Polymer electrolyte based on P（VDF-HFP）-PMMA was prepared by evaporation on the reinforced PP/PE/ PP composite membrane. The performance of the polymer electrolyte and the battery made with it were investigated at the same time. Confocal laser scanning microscope （LEXT）, Linear scanning voltammetry, electrochemical impedance spectroscopy and galvanostatic method were applied to investigate the effects of PMMA on the performance of polymer electrolyte. The results show that PMMA can ensure the polymer electrolyte absorb more liquid electrolyte, consequently enhance the ion conductivity greatly. When the ratio of P（VDF-HFP） .＂ PMMA equals 1, the uptaking amount of the liquid electrolyte reaches 306% and the ion conductivity is 1.63 mS/cm at room temperature. Linear scanning voltammetry indicate that the polymer electrolyte is stable up to 5. 2V. The polymer Li-ion battery （PLB） , made by sandwiching the polymer electrolyte between a LiCoO2 anode and a Li cathode , had well stabilization ability during charge-discharge cycle.

关 键 词：锂离子电池 聚合物电解质 P(VDF-HFP)-PMMA 离子电导率 

分 类 号：O641[理学—物理化学]