添加CeO_2的PVDF-HFP隔膜的性能研究

Research on the modified performance of PVDF-HFP/CeO_2 membrane

通过添加不同质量分数的二氧化铈(CeO2)纳米粒子,利用相转化法制备锂离子电池隔膜PVDF-HFP/CeO2,所制得的膜通过红外光谱、交流阻抗、线性伏安扫描、首次充放电等方法对其进行性能测试。实验表明,添加CeO2的PVDF-HFP改性膜不但有效地提高了膜的吸液率、孔隙率、离子电导率,而且也同时也降低了聚合物链的结晶度。当CeO2添加量为8%时,有较好的性能,最大吸液率和孔隙率分别是178%和85%。室温下离子电导率为2.41×10-3 S/cm,电化学稳定窗口为4.67V,库仑效率达99.09%,满足锂离子电池隔膜的要求。

By adding different mass fraction of nano cerium oxide （CeO2）, the lithium ion battery diaphragm of PVDF-HFP/CeO2 was prepared by using phase catalysis preparation method. The membrane was tested by infrared spec- trum, AC impedance,linear voltammeric method such as scanning, charge and discharge for the first time of the performance test. Experiments showed that the membrane not only improved the liquid absorption rate, membrane porosity and ionic conductivity effectively,but also decreased the crystallinity of the polymer chain. When the CeO2 addition amount was 8%, the membranes had the best performance,and the maximum liquid absorption rate and the porosity were 178% and 85%, respectively. The ionic conductivity at room temperature was 2.41 × 10^-3 s/cm, the electrochemical stability window was 4.67V, the discharge efficiency was 98.34 %,and the damping efficiency was 1.19%.