Mechanically enhanced room-temperature quaternary poly(ethylene oxide)-based solid polymer electrolytes derived by solvent-free process
Journal
Journal of Power Sources
Series/Report No.
Journal of Power Sources
Journal Volume
655
Start Page
237929
ISSN
0378-7753
Date Issued
2025-11-01
Author(s)
Parthasarathi, Senthil-Kumar
Chen, Hsi
Liao, Cheng-Hung
Chang, Shu-Jui
Rangasamy, Manjunath
Wang, Jui-Che
Lin, Yu-Han
Wu, Hung-Chun
Weng, Yu-Ting
Abstract
Solid polymer membranes/electrolytes (SPEs) can mitigate the threats of commercial lithium-ion batteries (LIBs) that use organic fluid electrolytes. Current SPEs show an inadequate ionic conductivity (at environmental temperature) and exhibit unsatisfactory mechanical strength, restricting their large-scale application. In this study, SPEs are prepared from a solvent-free method and consist of poly(ethylene oxide) (PEO), poly(vinylidene fluoride) (PVDF), lithium bis(trifluoromethane sulfonyl) imide (LiTFSI), and the solid-plasticizer succinonitrile (SN) with superior ionic conductivity, greater durability, and better electrochemical performance. Taguchi composition optimization leads to an optimized film ((PEO)10-LiTFSI)50-SN30-PVdF20, which demonstrates an ionic conductivity (at 303 K) of 1.04 × 10−3 S cm−1, which is two orders superior to bare ((PEO)10-LiTFSI)100 film made without SN. Besides, thanks to PVDF, the optimized ((PEO)10-LiTFSI)50-SN30-PVdF20 membranes exhibit a compressive modulus of 56.8 MPa, which is a five-fold increase when compared to without PVDF-added film (∼10 MPa). The solid-state coin cell is fabricated with LiFePO4/((PEO)10-LiTFSI)50-SN30-PVdF20/Li, exhibits a discharge capacity of 129 mAh g−1, and achieves 84 % capacity maintenance at the end of 300 cycles at 30 °C, indicating the potential of as-prepared SPEs for the posterity of solid-state LIBs, which offer higher energy density and better safety.
Subjects
Ionic conductivity
Mechanical stability
PEO
Solid-polymer membranes
Succinonitrile
SDGs
Publisher
Elsevier BV
Type
journal article