NOVELTY - A solid-state conducting polymer (P1) comprises at least one protein; at least one polymer (p') comprising at least one polar functional group, where the individual molecules of the polymer are entangled with strands of the protein; and 1-45 wt.% of at least one salt.    USE - For producing an electronic device (claimed); high performance battery products, such as flexible batteries to provide clean power for e.g. automobiles; for lithium ion batteries, chemical sensors, organic thin film transistors, electromechanical actuators, polymer light emitting electrochemical cells, and gas separation membranes; for making thin and flexible devices for the next generation electronics and high power density applications; and into an artificial skin to provide the artificial skin with electrical functionality.    ADVANTAGE - The solid-state conductor is deformable by 50-700% from an original configuration without damage to the solid-state conductor. The solid-state conducting polymer (P1) has an amorphous structure which enhances ionic conductivity, and provides adequate flexibility and other mechanical properties for fabrication and handling; and has desirable properties, such as high ionic conductivity, good thermal properties, high cation transference number, electrochemical stability, and stable electrolyte-electrode interface for batteries. The flexibility of solid-state conducting polymers is controlled by adjusting denatured structure of soy protein. The polymer (P1) is easy to fabricate, and is environmentally friendly in both processing and material usage.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) preparing (M1) solid-state conductor involving dissolving at least one salt in a solvent to form salt solution; mixing protein with the salt solution to form protein dispersion; mixing polymer (p') with the protein dispersion to form polymer-protein mixture; and evaporating the solvent from the mixture to form solid-state conductor comprising 1-45 wt.% salt; and    (2) an electronic device (D1) comprises a first electrode (104); second electrode (106) spaced apart from the first electrode; solid polymer electrolyte (108) disposed between the first electrode and second electrode, and comprising at least one salt; polymer (p') molecules; and protein mixed with the polymer (p') molecules, where the protein has network structure of individual, at least partially unfolded protein strands, the individual molecules of the polymer (p') are entangled in the network structure of the protein; and the solid polymer electrolyte comprises 1-45 wt.% salt, and has an electrical conductivity that allows an electrical current (114) to flow between the first and second electrodes.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view of an electronic device.    Lithium-ion battery (100)    Housing (102)    First electrode (104)    Second electrode (106)    Solid polymer electrolyte (108)    Lithium ions (112)    Current (114)    Load (116)