POLYVINYLIDENE FLUORIDE BASED COMPOSITE ELECTROLYTES FOR LITHIUM-ION BATTERIES
DOI:
https://doi.org/10.15421/jchemtech.v30i4.262053Keywords:
lithium-ion polymer batteries, ionic conductivity, composite polymer electrolyte, filler, films.Abstract
Solid polymer electrolytes, which are currently replacing traditional liquid electrolytes, are currently considered as an important strategy in the development of lithium ion batteries that are safe and with high energy density. But poor ionic conductivity and weak mechanical characteristics have significantly limited the development of solid polymer electrolytes. To improve these characteristics six composite polymer electrolytes (CPEs) with a composition of PVDF-PEG-LiClO4-X and different fillers (where X = LiF, Ce2O3, Na2SO4, Li3PO4, MgO, LiH2PO4) were synthesized in this work. The optimal composition of the CPE and filler of PVDF-PEG-LiClO4-Li3PO4 has been determined (σ = 2,36·10-5 Ohm-1×cm-1.). The result of the filler concentration effect on the ionic conductivity of films was studied where optimal filler concentration of 5 % Li3PO4 had the highest ionic conductivity of
1.43×10-4 Ohm-1·cm-1. The surface morphology, electrochemical and thermal stability of the obtained CPEs have been studied by various techniques. Investigation of physicochemical aspects of the effect of fillers on the solid polymer electrolytes properties will make it possible to derive the regularities and universal methods for obtaining effective separators that ensure stable operation of the battery.
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