Non-Volatile Polymer Electrolyte Based on Poly(propylene carbonate), Ionic Liquid, and Lithium Perchlorate for Electrochromic Devices

Abstract

A series of solvent-free ionic liquid (IL)-based polymer electrolytes composed of amorphous and biodegradable poly(propylene carbonate) (PPC) host, LiClO4, and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM(+)BF4(-)) were prepared and characterized for the first time. FTIR studies reveal that the interaction between PPC chains and imidazolium cations weakens the complexation between PPC chains and Li(+) ions. Thermal analysis (DSC and TGA) results show that the incorporation of BMIM(+)BF4(-) into PPC/LiClO4 remarkably decreases the glass transition temperature and improves the thermal stability of the electrolytes. AC impedance results show that the ionic conductivities of the electrolytes are significantly increased with the increase of BMIM(+)BF4(-) amount, the ambient ionic conductivity of the electrolyte at a PPC/LiClO4/BMIM(+)BF4(-) weight ratio of 1/0.2/3 is 1.5 mS/cm, and the ionic transport behavior follows the Arrhenius equation. Both PPC/LiClO4/BMIM(+)BF4(-) and PPC/BMIM(+)BF4(-) electrolytes were applied in electrochromic devices with polyaniline as the electrochromic layer. The PPC/LiClO4/BMIM(+)BF4(-)-based device exhibits much better electrochromic performance in terms of optical contrast and switching time due to the presence of much smaller cations.

Ionic liquid incorporated nanocomposite polymer electrolytes for rechargeable lithium ion battery: A way to achieve improved electrochemical and interfacial properties

“…Hence the electrolytes are not dimensionally stable showing glue like nature beyond addition of 10 wt% of EMImTFSI. This is owing to the reason that the M a n u s c r i p t ionic association effect of component ions of EMImTFSI and LiTFSI which agrees well concurrent with the previous reports [43][44][45]. It can be conclude that the [(PEO) 8 LiTFSI-10% NC]+10% EMImTFSI (A4) composition is the most promising composite polymer electrolyte which has maximum conductivity of the order of 10 -2 Scm -1 at 343 K which is high for their use in many devices and particularly in lithium battery.…”

Safety‐Reinforced Poly(Propylene Carbonate)‐Based All‐Solid‐State Polymer Electrolyte for Ambient‐Temperature Solid Polymer Lithium Batteries

“…[ 45 ] This indicates the formation of a transient cross-linking complex through the interaction of Li + and some carbonyl oxygen of PPC. [ 47 ] Interacting C O groups in PPC are considered to enable migration of Li + faster than that coordinated with ether chains in PEO. [ 55 ] Similar phenomenon can be observed in other characteristic bands of PPC, such as C-O-C stretching vibrations at 1230 cm −1 .…”

Effect of the degree of porosity on the performance of poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide) blend membranes for lithium-ion battery separators

“…Further, polymer electrolytes can be used in multiple applications, including electrochromic devices [9][10][11], fuel cells [12,13] and sensors/actuators [14], supercapacitors/ultracapacitors [15], together with Li-ion batteries [4,16].…”