| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 101 === Synthesis of PAN-PEO-PAN block copolymer with diamine functional group via redox polymerization has been accomplished and characterized with FT-IR and 1H-NMR analysis. Then the copolymer react with poly(dimethylsiloxane) and PEGDE for polymer electrolytes, it has great electrochemical window and thermal stability up to 4.5V and 250 oC. The surface characterization of membranes could be seen by SEM, indicated that it has many pores on the polymer surface, and pores will increase as the polysiloxane contents increase. The DSC result, indicates that the PEO crystallinity is increasing because of adding polysiloxane will lead PEO to aggregate and make small phase separation.
But the crystallization of PAN is deteriorated by adding polysiloxane as a
result of XRD. The ionic conductivity of polymer electrolyte with
polysiloxane can be enhanced to 3.157 x10-4 S/cm, compared to that of
the polymer of none polysiloxane (6.736 x10-4 S/cm). Furthermore,
Li-ion transport number can be up to 0.72. For battery application, under
all charge/discharge rates (from 0.1 to 5 C), the specific half-cell
capacities of hybrid polymer electrolyte can be up to 150 mAh g-1 at 0.1C and 80 mAh g-1 at 5C. The advantageous properties of the membrane allow it to act as both an ionic conductor as well as a separator .
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