| 초록 |
Solid polymer electrolyte (SPE) was prepared from PAEK-g-PEG and PYR14-TFSI IL. Interfacial compatibility, lithium ion conductivity and transference number, thermal, mechanical and dimensional stability for lithium battery applications were investigated and correlated to ion cluster dimension examined by SAXS. The synthesized SPE illustrated thermal degradation temperature over 200oC, elongation at break of 250 % and negligible dimensional change at 120oC. This flexible SPE exhibited the highest ion conductivity of ~ 1×10-3 S cm-1 at room temperature. As the active electrode materials such as LCO and NMC622 were quite compatible with SPE, the battery cells fabricated by binding the SPE and cathode layer showed excellent cell performance of 139.01 mAh g-1 (LCO) and 158.15 mAh g-1 (NMC 622) at 0.1 C. When this multi-functional SPE was applied to the lithium sulfur battery system, the cell discharge capacity was even higher than 925 mAh g-1 at 0.1C with cyclic stability (＞50 cycles). |
