Complex Impedance Spectroscopic Studies of PMMA(80,70,60,50) : PC(10,20,30,40): PVP(10): LiClO4(5) Polymer Solid Electrolyte Systems

R. Swarnalatha, A. Chary, Venkata Ramana Jeedi, Y. Mallaiah, S. Reddy
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Abstract

Polymer solid electrolytes PMMA(80,70,60,50): PC(10,20,30,40):PVP(10):LiClO4(5) were synthesized according to stoichiometric ratios using solution cast method. FTIR study confirms the good complexation among the constituent materials in the polymers matrix. Complex impedance and electric modulus studies are carried out and explained. From cole-cole plots, maximum decrement of resistance is observed at a threshold ratio 70Wt% PMMA: 20Wt% PC: 10Wt% PVP: 5Wt% LiClO4 and this could be due to the high mobility of the Li+ ion in the polymer network due to the plasticizer. The plasticizer plays an important role in decreasing the viscosity of the system, which in turn favors the mobility of segmental motion of polymer network and fast ion motion in the polymer. Real and Imaginary electric modulus spectra show the presence of relaxation peaks and confirm that the polymer solid electrolyte is an ionic conductor.
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PMMA(80,70,60,50)、PC(10,20,30,40)、PVP(10)、LiClO4(5)聚合物固体电解质体系的复阻抗谱研究
采用溶液铸法制备了PMMA(80,70,60,50): PC(10,20,30,40):PVP(10):LiClO4(5)等聚合物固体电解质。FTIR研究证实了聚合物基体中各组分之间具有良好的络合性。复杂阻抗和电模量的研究进行和解释。从cole-cole图中,在阈值比为70Wt% PMMA: 20Wt% PC: 10Wt% PVP: 5Wt% LiClO4时观察到最大的电阻衰减,这可能是由于增塑剂使聚合物网络中的Li+离子具有高迁移率。增塑剂在降低体系粘度方面起着重要的作用,从而有利于聚合物网络的节段运动和聚合物中离子的快速运动。实、虚电模量谱显示了弛豫峰的存在,证实了聚合物固体电解质是离子导体。
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