TECHNOLOGY FOCUS - ELECTRONICS - Preferred Cell: In the electrochemical cell, the melting point of the negative electrode is less than the softening temperature of the second polymer phase. The melting point of the negative electrode is no more than about 180 degrees C. The negative electrode comprises lithium. The first phase comprises comb polymers that have a backbone and pendant groups. The pendants are selected from oligoethers, substituted oligoethers, nitrile groups, sulfones, thiols, polyethers, polyamines, polyimides, polyamides, alkyl carbonates, polynitriles, other polar groups, and combinations. Alternatively, the electrochemical cell comprises: a negative electrode; a positive electrode; a solid polymer electrolyte positioned between the negative electrode and the positive electrode, the electrolyte comprising: an association of a set of block copolymer chains each comprising: at least one ionically conducting block; at least one poly (2,6-dimethyl-1,4-phenylene oxide) (PXE) block immiscible with the ionically conducting block; where the chains are arranged in an ordered nanostructure comprising a continuous matrix of: first domains defined by association of ionically-conductive blocks; and second domains defined by association of PXE blocks. Preferred Method: In operating the electrochemical cell, the operating temperature is not more than 160 degrees C, preferably not more than 100 degrees C. The method further comprises: (e) recharging the cell.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymers: The first phase is selected from polyethers, polyamines, polyimides, polyamides, alkyl carbonates, polynitriles, polysiloxanes, polyphosphazines, polyolefins, polydienes, and combinations. The backbones are selected from polysiloxanes, polyphosphazines, polyethers, polydienes, polyolefins, polyacrylates, polymethacrylates, and combinations. The second phase is selected from (poly(phenylene oxide), poly(2,6-dimethyl-1,4-phenylene oxide) (PXE), poly(phenylene sulfide), poly(phenylene sulfide sulfone), poly(phenylene sulfide ketone), poly(phenylene sulfide amide), poly(phenylene sulfide ketone ketone), poly(ether ether ketone), polysulfone, and combinations. A set of at least two kinds of homopolymers form the first phase and the second phase, the homopolymers capable of microphase separation by self assembly. Also, a set of block copolymers form the first phase and the second phase, where the block copolymer structure comprises Formula I.Ar=selected from formulas 1, 2 and 3.Y=selected from ketones, sulfones, isopropylidene, hexafluoroisopropylidene, amides and oxygen;R1, R2, R3, R4, and R5=each selected from hydrogen, alkyl, halogenated alkyl, alkene, aromatic rings, siloxane and alkyl with O and S ether bonds;n=an integer ranging from 1-10;a=an integer ranging from 10-90; andb=an integer ranging from 10-90.The block copolymer structure further comprises an additional group with the following structure represented by formula II, the additional group attached to the polymer to form formula III.c=an integer ranging from 10-90.