A New Class of P(VdF-HFP)-CeO2-LiClO4-Based Composite Microporous Membrane Electrolytes for Li-Ion Batteries

Abstract

Composite microporous membranes based on Poly (vinylidene fluoride-co-hexafluoro propylene) P(VdF-co-HFP)-CeO 2 were prepared by phase inversion and preferential polymer dissolution process. It was then immersed in 1M LiClO 4 -EC/DMC (v/v = 1 : 1) electrolyte solution to obtain their corresponding composite microporous membrane electrolytes. For comparison, composite membrane electrolytes were also prepared by conventional phase inversion method. The surface morphology of composite membranes obtained by both methods was examined by FE-SEM analysis, and their thermal behaviour was investigated by DSC analysis. It was observed that the preferential polymer dissolution composite membrane electrolytes (PDCMEs) had better properties, such as higher porosity, electrolyte uptake (216 wt%), ionic conductivity (3.84 mS·cm −1 ) and good electrochemical stability (4.9 V), than the phase inversion composite membrane electrolytes (PICMEs). As a result, a cell fabricated with PDCME in between mesocarbon microbead (MCMB) anode and LiCoO 2 cathode had better cycling performance than a cell fabricated with PICME.

Inorganic Fillers in Composite Gel Polymer Electrolytes for High-Performance Lithium and Non-Lithium Polymer Batteries

“…The addition of CeO 2 NPs to the GPE reduced the interfacial resistance and enabled a wider electrochemical window and good cycling performance. Vijayakumar et al [ 125 ] reported similar results in which the incorporation of CeO 2 reduced the ion coupling and increased the charge carrier number, thereby improving the ionic conductivity. However, an excess of CeO 2 led to an increased dilution effect, which resulted in a continuous decrease in the electrolytic conductance.…”

Physical and Charge-Discharge behavior of Facile PVdF-co-HFP Nanocomposite Polymer Electrolyte for Lithium Ion Polymer Batteries

“…Accordingly to the free volume model, the activation energy should be related to the mobility of the charge carriers [27]. provides a higher free volume on increasing the temperature effect [17]. The thin film electrolyte conductivity behavior is closely resembled to liquid state electrolyte [28].…”

“…This is due to the interaction of zinc oxide nanoparticles with PVdF-co-HFP and also due to compatibility. Further addition of filler content into the PVdF-co-HFP polymer matrix increased the crystallinity (29.47%) and also the heat of fusion (28.14) to some extent (Table . 1), due to the steric hindrance of the agglomerated nanoparticles on the polymer matrix [17]. Further, Low crystalline may be originated from the usage of NMP as a solvent, which interacted with VdF chain specifically the interaction between N-atom of NMP and VdF chain and consequently inhibit chain rearrangement.…”

“…Therefore, variety of polymer electrolytes has been employed such as poly(vinylidene fluoride) PVdF [7], poly(methacrylate) PMMA [8], Polyethylene oxide PEO [9], poly (vinylidenefluoride-co-hexafluoro propylene) (PVdF-co-HFP) [10][11][12], polyacrylonitrile (PAN) [13], poly(acrylonitrilemethacrylate) P(AN-MMA) [14] matrix. Among the various available polymer matrices, the copolymer of poly (vinylidenefluoride-co-hexafluoro propylene) (PVdFco-HFP) matrix has received prime significance in RLIB's [15][16][17]. The preparation of secure and well-organized polymer electrolytes still challenges.…”

“…The preparation of secure and well-organized polymer electrolytes still challenges. To date, researchers concentrated to prepare nanocomposite polymer membrane electrolytes such as SiO 2 [18], rutile TiO 2 [19], nano TiO 2 [20] Al 2 O 3 [21], CeO 2 [17], MgO [16], etc to develop their performance in lithium batteries. The addition of nanofillers on PVdF-co-HFP based microporous matrix has been adopted by phase inversion techniques [22] and followed by absorption of electrolyte (Lithium salt solution) to reduce the leakage and better compatibility towards electrodes.…”