离子型聚合物Poly(MMA-co-maleic Li)的合成及其对基于PEO凝胶聚合物电解质性能影响研究

Study of synthesis ionomer (Poly(MMA-co-maleic acid lithium)) and its impact on the properties of PEO-based gel polymer electrolyte

文中合成了一种离子型聚合物甲基丙烯酸甲酯共聚马来酸锂(Poly(MMA-co-maleic lithium)),并将其与聚环氧乙烷(PEO)共混,通过溶液浇铸法制得应用于聚合物锂离子电池的凝胶聚合物电解质.研究表明,PEO链段的结晶度由于离子型聚合物的共混以及液体电解质的增塑作用得到了有效抑制,有利于增加体系的无定形区,促进锂离子在体系中的传递.电化学测试表明:该凝胶聚合物电解质的室温离子电导率可达10-3S/cm数量级,电化学稳定窗口超过4.5 V,这些性能都表明其在聚合物锂离子电池的开发中有较好的应用前景.

In this paper, an ionomer Poly（MMA-co-maleic Li） was synthesized.It was blended with PEO to get the novel blending ionomer gel polymer electrolyte by the method of solution casting .It was found that with the interaction of blending ionomer chains and the plasticizing effect of the absorbed liquid electrolyte , the crystallin-ity of the PEO chains was suppressed effectively , which could promote lithium-ion′s movement in the system . The ionic conductivity of the blending gel polymer electrolyte which was characterized by means of AC impedance could reach 10 -3 S/cm order of magnitude at room temperature , and its electrochemical stability window was 4.5 V, which made it a potential candidate for application as polymer electrolyte in devices .