Abstract: Example implementations include a current collector device with a first substantially planar metallic layer including a foil material, and a core layer including a polymer and phosphate fire retardant and disposed by a first planar surface thereof on a first planar surface of the first metallic layer. Example implementations also include a method of manufacturing a core layer for a current collector device, by combining benzene and oxy dianiline at a first ratio in a solvent to form a solution, adding dianhydride to the solution at a second ratio, adding triphenyl phosphate to the solution, polymerizing the solution by heating the solution to form a polymerized solution; and forming a polymer film from the polymerized solution. Example implementations also include a temperature modulating layer including a temperature modulating material and disposed by a first planar surface thereof on a second planar surface of the first core layer.