Abstract
In this paper, we present the characteristics and performance of polymer electrolyte membranes (PEMs) based on poly(vinylidene fluoride) (PVDF). The membranes were prepared via a phase-inversion method (non-solvent-induced phase separation (NIPS)). As separators for lithium battery systems, additive modified montmorillonite (MMT) nano-clay served as a filler and poly(vinylpyrrolidone) (PVP) was used as a pore-forming agent. The membranes modified with an additive (8 wt % nano-clay and 7 wt % PVP) showed an increased porosity (87%) and an uptake of a large amount of electrolyte (801.69%), which generated a high level of ionic conductivity (5.61 mS cm−1) at room temperature. A graphite/PEMs/LiFePO4 coin cell CR2032 showed excellent stability in cycling performance (average discharge capacity 127 mA h g−1). Based on these results, PEMs are promising materials to be used in Polymer Electrolyte Membranes in lithium-ion batteries.
Highlights
Energy storage devices are in high demand for applications in renewable energy, transportation, and mobile electronic devices
We report the ionic conductivity and cycling stability improvement of poly(vinylidene fluoride) (PVDF)/nanoclay as Polymer Electrolyte Membranes for LiFePO4 Batteries
Intercalation of nano-clay into PVDF polymer using non-solvent induced phase separation (NIPS) method is based on the dimethylacetamide (DMAc) solvent system
Summary
Energy storage devices are in high demand for applications in renewable energy, transportation, and mobile electronic devices. Secondary batteries (lithium-ion) are the current state-of-the-art in energy storage devices because they offer high-energy density, they are safe for the environment, and they provide a long life-cycle [1,2]. In the current LIB industry, a microporous polypropylene membrane is used as a separator. This separator avoids physical contact between a cathode and an anode. This separator must have the ability to serve ionic transfers between the electrodes [4,5]
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