Impedance and FTIR studies on plasticized PMMA–LiN(CF3SO2)2 nanocomposite polymer electrolytes

Abstract

Plasticized polymer electrolytes composed of poly (methyl methacrylate) (PMMA) as the host polymer and lithium bis(trifluoromethanesulfonyl)imide LiN(CF 3 SO 2 ) 2 as a salt were prepared by solution casting technique at different ratios. The ionic conductivity varied slightly and exhibited a maximum value of 3.65×10 −5 S cm −1 at 85% PMMA and 15% LiN(CF 3 SO 2 ) 2 . The complexation effect of salt was investigated using FTIR. It showed some simple overlapping and shift in peaks between PMMA and LiN(CF 3 SO 2 ) 2 salt in the polymer electrolyte. Ethylene carbonate (EC) and propylene carbonate (PC) were added to the PMMA-LiN (CF 3 SO 2 ) 2 polymer electrolyte as plasticizer to enhance the conductivity. The highest conductivities obtained were 1.28×10 −4 S cm −1 and 2.00×10 −4 S cm −1 for EC and PC mixture system, respectively. In addition, to improve the handling of films, 1% to 5% fumed silica was added to the PMMA-LiN(CF 3 SO 2 ) 2 -EC-PC solid polymer electrolyte which showed a maximum value at 6.11×10 −5 S cm −1 for 2% SiO 2 .

Ionic Conductivity and Dielectric Studies of Chitin Nanofiber (CNF) Incorporated PMMA Based Polymer Electrolytes

“…These amorphous region favours the migration of lithium ion in the free volume of polymer matrix. These results are in agreement with the results reported earlier [12]. The conductivity of CNF incorporated PMMA based polymer electrolytes increases upon one order of magnitude compared to filler free electrolyte F1.…”

Lithium Polymer Electrolytes Based on Sulfonated Poly(ether ether ketone) for Lithium Polymer Batteries

“…[20] In some polymer electrolytes, an organic liquid electrolyte is incorporated into the polymer matrix to form polymer gel electrolytes, but this requires mechanical support from other battery components; nonetheless, they have higher conductivities. [10] Gel polymer electrolytes based on PMMA exhibiting ionic conductivity in the order of 10 -4 S cm -1 were reported by Ra-mesh et al [13] PVdF-based polymer gel electrolytes show ionic conductivities up to 0.1 S cm -1 at room temperature and have a wide electrochemical window and good processability. For example, the performance of a lithium-ion-polymer battery with TiO 2 as the anode and LiNi 0.4 Mn 1.5 O 4 as the cathode with a PVdF-based gel electrolyte was demonstrated to retain 80 % of the low-rate capacity at 5 C. [21] Kim et al report that the PVdF-based polymer electrolyte exhibits better compatibility with a lithium-metal electrode, as this device delivers a theoretical specific capacity of 170 mA h g -1 at 0.1 C-rate.…”

“…The H 13 atom yields a distinct signal in the 1 H NMR spectrum at δ = 7.51 ppm because of its unique environment with the -SO 3 H group as its nearest neighbor. The resonance for H 13 is at a higher chemical shift than that for H 14 and H 15 owing to an increase in the deshielding effect of the H 13 atom by the addition of the -SO 3 H group to the hydroquinone segment of the PEEK repeating unit. As reported earlier, the DS values of the polymer membranes were calculated from the peak area corresponding to the H 13 atom relative to the peak areas of all the other hydrogen atoms combined.…”

“…The advantages of using a polymer electrolyte instead of a liquid electrolyte in Li-ion batteries include nonleakage of the electrolyte, high energy density, flexibility, and improved safety. [6][7][8][9][10] Polymers including PEO, [11] polyacrylonitrile, [12] poly(methyl methacrylate) (PMMA), [13] poly(vinylidene fluoride) (PVdF), [14,15] poly(vinyl chloride), [16,17] poly(vinyl acetate), [18] and their copolymers have been used as polymer matrixes. Li-ion batteries with liquid electrolytes can have specific energy densities as high as 150 W h kg -1 , whereas lithium-polymer batteries can afford specific energy densities of 180 W h kg -1 with much improved safety.…”

Ionic Liquids for the Future Electrochemical Applications

“…In addition, the ionic liquids have the ability to obtain high concentrations of aluminium in a highly conducting aprotic medium for aluminium deposition (Buzzeo et al, 2004). For ionic liquids, anions such as BF 4 -and PF 6 -were initially used quite extensively because of their wide potential window, however, slow hydrolysis by water, yielding HF, has led to an increase in the use of water stable anions such as (CF 3 SO 2 ) 2 N¯ (Ramesh & Ang, 2010). As a result, other anions such as (CN) 2 N¯ p-toluenesulfonate and methylsulfonate have recently been extensively used for metal deposition (Borra et al, 2007).…”