Ionic liquid impregnated lithium ion conductive solid electrolytes based on poly(acetyl ethylene glycol methacrylate-co-methyl acrylate)

다국어 초록 (Multilingual Abstract)

Poly(ethylene glycol)methacrylate (PEGMA) was modified with acetyl chloride to afford acetyl-poly(ethylene glycol)methacrylate (AEGMA) containing PEG and carbonyl groups at the pendant position. AEGMA was further reacted with methyl acrylate (MAc) to synthesize poly(AEGMA-co-MAc) copolymer containing additional carbonyl groups. When lithium salts such as lithium perchlorate (LiClO4) and lithium bis(trifluoromethanesulfony)imides (LITFSI) were introduced into the poly(AEGMA-co-MAc) membrane, the ionic conductivity increased with increasing lithium salt concentration up to 15 wt%, followed by a decrease because when the lithium ion concentration was above its saturation level, the excess lithium salts aggregated together exerting a negative effect on ion transport. The maximum ionic conductivity of the copolymer system containing lithium salt was 1.1 × 10-4 S cm-1 at 15 wt% MAc and 15 wt% of LiTFSI concentration. When room temperature ionic liquid (RTIL), PYR14-TFSI in addition to LiTFSI salt was introduced to the poly(AEGMA-co-MAc)-LiTFSI, the ionic conductivity increased monotonically with increasing salt/RTIL concentration. The maximum ionic conductivity of 1.2 × 10-3 S cm-1 was obtained at 70 wt% 0.5 M LiTFSI/PYR14-TFSI concentration.

목차 (Table of Contents)

• Index
• 1. Introduction 1
• 2. Experimental 3
• 2.1 Materials 3
• 2.2 Synthesis of lithium salt and RTIL 4
• 2.3 Preparation of the Polymer Electrolyte 7
• 2.4 Characterizations 10
• 3. Results and Discussion 11
• 3.1 Identification of chemical structure 11
• 3.2 Thermal transition behavior of poly(AEGMA-co-MAc) 15
• 3.3 Ion conductivity of poly(AEGMA-co-MAc ) 17
• 3.3.1 Effect of polymer composition 17
• 3.3.2 Effect of electrolyte salt concentration 20
• 3.3.3 Effect of RTIL 22
• 4. Conclusion 28
• 5. Reference 30