Electrochemical and Spectroscopic Properties of Electrospun PAN-Based Fibrous Polymer Electrolytes

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Abstract
Microporous fibrous polymer electrolytes were prepared by immersing electrospun poly(acrylonitrile) (PAN)-based fibrous membranes into lithium salt-based electrolytes. They showed high ionic conductivities of up to 1.0×10−3S∕cm1.0×10−3S∕cm at 20°C, and sufficient electrochemical stabilities of up to 4.5 V. Their ion conduction depended on the physicochemical properties of the lithium salt-based electrolytes trapped in pores, as well as on the interactions among the Li+Li+ ion, the carbonate, and the PAN. From the Fourier transform-Raman data, lithium ion transport was mainly achieved by the lithium salt-based electrolytes in pores via the interaction between the Li+Li+ ion and the C=OC=O group of carbonate molecules, and was also affected by the PAN through the interaction between the Li+Li+ ion and the C≡NC≡N groups of PAN. Their electrochemical stabilities were enhanced by the swelling of the electrospun PAN nanofibers because of the dipolar interaction between the C≡NC≡N groups of PAN and the C=OC=O groups of carbonate in the lithium salt-based electrolytes. Prototype cells using electrospun PAN-based fibrous polymer electrolytes thus showed different cyclic performances, according to the composition of the lithium salt-based electrolytes. The prototype cell with 1MLiPF6-ethylene carbonate∕dimethyl carbonate(1∕1)1MLiPF6-ethylene carbonate∕dimethyl carbonate(1∕1) showed the highest discharge capacity and the most stable cyclic performance among them.

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