Influencing of [EDIMP]TFSI in PMMA-PLA doped LiTFSI based hybrid gel polymer electrolyte on the variation in crystallinity phase and ionic conduction properties

• Published in: Journal of non-crystalline solids 2023-12, Vol.621, p.122634, Article 122634
• Main Authors: Mazuki, N.F., Kufian, M.Z., Saari, Mohd Mawardi, Samsudin, A.S.
• Format: Article
• Language: English
• Subjects: Amorphous phase; Gel polymer electrolyte; Ionic transportation; Lithium ions
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2023.122634

•A new hybrid gel polymer electrolytes system consists of PMMA- PLA blend doped with LiTFSI and incorporated with various [EDIMP]TFSI contents are successfully prepared.•The HGPEs reveal the enhancement of structural and amorphous features.•The reduction of crystalline phase in HGPEs contributed to the decrement in glass transition and further improved the electrical properties.•The increment of ionic conductivity up to 3.90 × 10−3 s cm−1 for the sample containing 20 wt.% of [EDIMP]TFSI is mainly influenced by μ, D, and η behavior. In this study, we explored hybrid polymer complex-based gel polymer electrolytes (HGPEs) comprising poly(methyl methacrylate) (PMMA) and polylactic acid (PLA) as host polymers doped with LiTFSI, incorporating varying amounts of the ionic liquid ethyl-dimethyl-propylammonium bis(trifluoromethylsulfonyl)imide ([EDIMP]TFSI). The structural properties of HGPEs has been assessed using FTIR, XRD, and DSC, observing changes in peak intensity, increased amorphous phases, and lowered glass transition temperatures (Tg) as [EDIMP]TFSI content increased. The room temperature ionic conductivity improved from 1.02 × 10−3 S cm−1 to 3.90 × 10−3 S cm−1 with [EDIMP]TFSI incorporation. The permittivity spectra were showed to follow the non-Debye characteristic. The Arof-Noor (A-N) method determined ionic mobility, charge carrier concentration, and diffusion coefficient to understand factors influencing ionic conductivity variation. The reduced interfacial resistance between HGPE and lithium metal enhanced contact with the electrode. Sample E-TFSI 20 reveals the tLi+ and electrochemical potential window were respectively 0.79 ± 0.005 and 5 ± 0.5 V.