TECHNOLOGY FOCUS - ELECTRONICS - Preferred Conductor: In the solid-state conductor, the polyether comprises a polymer of alkylene oxide. The polyether comprises poly(ethylene oxide), polyoxyethylene, poly(propylene oxide) (preferred), or a combination. The poly(ethylene oxide) has a molecular weight of about 200 to about 8x106 gram/mol. The polymer comprises polyamines, polyamides, polyketones, polycarbonate, polyimine, polyester, polyurethane, or a combination. The protein comprises a plant protein, an animal protein, or a combination. The protein comprises a soy protein, a bean protein, a grain protein, or a combination. The protein comprises glycinin, beta -conglycinin, or a combination. The solid-state conductor further comprises at least one salt; and a set of cations noncovalently bound with the polyether, the protein, or both. The cation comprises lithium (Li+), potassium (K+), sodium (Na+), calcium (Ca2+), magnesium (Mg2+), cadmium (Cd2+), aluminum (Al3+), zinc (Zn2+), iron (Fe2+), Fe3+, lead (Pb2+), copper (Cu2+), silver (Ag+), or a combination. The polymer consists of the polyether. The ratio of the protein polymer to the polyether is 20:80 by weight to about 60:40 by weight. The polyether molecules are about 100% amorphous. The ratio of the protein to the polyether is about 55:45 by weight; the polyether molecules are about 100% amorphous; and the polyether mixed with the protein have a flexibility of about 50% to about 700%. The solid-state conductor comprises essentially of the polymer and the protein; and the polymer and the protein. The solid-state conductor comprises essentially of the polymer, the protein, and at least one salt. The salt comprises at least one of lithium hexafluorophosphate (LiPF6), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium imide (LiN(CF3SO2)2), lithium hexafluoroarsenate (LiAsF6), monolithium monocarbon trifluorosulfite (LiCF3SO3), lithium iodide (LiI), lithium bis(oxalate)borate (LiBC4O8) (LiBOB), Li(PF3(C2F5)3), lithium trifluoromethanesulfonate (LiTf), lithium bis(trifluoromethanesulfonyl) imide (Lilm), lithium bromide (LiBr), lithium chloride (LiCl), lithium thiocyanate (LiSCN), LiTFSM, sodium iodide (NaI), LiCF3CO2, sodium bromide (NaBr), sodium thicyanate (NaSCN), potassium thiocyanate (KSCN), magnesium chloride (MgCl2) and magnesium chlorate (Mg(ClO4)). The polymer is poly(ethylene oxide), the protein is a soy protein and the salt comprises at least one of LiPF6, LiTFSI, LiBF4, LiClO4, LiN(CF3SO2)2, LiAsFg, LiCF3SO3, LiI, LiBC4O8(LiBOB), Li(PF3(C2F5)3), LiTf, Lilm, LiBr, LiCl, LiSCN, LiTFSM, NaI, LiCF3CO2, NaBr, NaSCN, KSCN, MgCl2 and Mg(ClO4). The solid state conductor comprises 10-25 wt.% salt, 33-40 wt.% polymer, and 41-49 wt.% protein. The polymer is poly(ethylene oxide), the protein is a soy protein and the salt is LiClO4. Preferred Device: In the electronic device, an oxygen polar group of one of the polyether molecule is bound to an ammonium group of one of the protein strands. The electronic device further comprises at least one salt contained in the solid-state medium, where the solid polymer electrolyte has an ionic conductivity that allows ions of the salt to migrate between the first electrode and second electrode; at least one salt contained in the solid polymer electrolyte, where individual carbonyl groups of one of the protein strands are bound to a cation of the salt to effect repulsion from adjacent protein strands; at least one salt contained in the solid polymer electrolyte, where: at least one of the protein strands has a carbonyl group; at least one of the polyether molecules has an oxygen polar group; and a cation of the salt is bound to the oxygen polar group of the one of the polyether molecules and to the carbonyl group of the one of the protein strands; and at least one salt contained in the solid polymer electrolyte, where: at least one of the protein strands has a carbonyl group; at least one of the polyether molecules has a first oxygen polar group and a second oxygen polar group; a cation of the salt is bound to the first oxygen polar group of the one of the polyether molecules and to the carbonyl group of the one of the protein strands; and the second oxygen polar group of the polyether molecule is bound to an ammonium group of the protein strand. Preferred Method: Preparing the solid-state conductor further comprises denaturing the protein in the protein dispersion prior to mixing with the polyether material. Providing the protein dispersion comprises adding the protein to a solvent having a pH to generate the protein dispersion; and the method further comprises heating the protein dispersion at a treatment temperature for a treatment period prior to mixing with a polyether material. The method as well comprises adjusting at least one of the pH of the solvent, the treatment temperature, or the treatment period based on at least one of a target electrical conductivity or a targeted mechanical flexibility of the solid-state conductor; and casting the polyether-protein mixture on a substrate before evaporating the solvent. The formed solid-state conductor is at least 50% amorphous. The formed solid-state conductor is amorphous. The protein includes a set of protein strands, and where heating the protein dispersion includes forming a fine-stranded network structure with the set of protein strands. The protein includes a set of protein strands in a coiled structure; and heating the protein dispersion includes substantially unfolding the set of protein strands in the coiled structure, thus forming a fine-stranded network structure with the set of protein strands. The protein includes a set of protein strands in a coiled structure; and adjusting at least one of the pH of the solvent, the treatment temperature, or the treatment period includes adjusting at least one of the pH of the solvent, the treatment temperature, or the treatment period to substantially unfold the set of protein strands in the coiled structure. The protein includes a set of protein strands; heating the protein dispersion includes forming a fine-stranded network structure with the set of protein strands; and evaporating the solvent forms a solid-state conductor having the polyether material entangled in the fine-stranded network structure of the protein. The method also comprises adjusting at least one of a ratio between the polyether material and the protein, a composition of the polyether material, or a composition of the protein based on at least one of a target electrical conductivity or a target mechanical flexibility of the solid-state conductor. The solvent comprises water. Providing the protein dispersion comprises: dissolving a salt in a solvent to form a salt solution; and mixing a protein with the salt solution to form the protein dispersion.