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The preparation of polymer electrolytes (PE) and characterization is an important part. The polymer electrolytes are prepared by solution cast technique, in-situ polymerization, Phase separation/inversion method, electrospinning technology, spin coating, melt intercalation, and hot press method. The structural and morphological examination is done by X-ray diffraction, Field emission scanning electron microscopy, and transmission electron microscopy. The electrical properties of PE like ionic conductivity, voltage stability window, and ion/cation transport number are evaluated from the impedance spectroscopy technique. The thermal properties of the PE are examined by thermogravimetric analysis and differential scanning calorimetry. The characterizations are summarized in Table 3.3.