Polymer gel electrolytes are systems which may be used to create a new generation of lithium-ion cells.These materials consist of a polymer matrix and liquid electrolyte immobilized in its structure.Polymer gel electrolytes based on poly(vinylidene fluoride-cohexafluoro propylene)may be modified by various type of additives,such as inorganic fillers or ion receptors.Receptor is a compound which may contain gaps,crevices,branches,bridges or various functional groups to interact or to bound other compounds.Crown ethers are cyclic receptors which have oxygen atoms in their structure and may bound cations.