Negative electrode including a polymeric single-ion conductor coating

An electrochemical cell, comprising:

• a positive electrode;
• and
• a negative electrode including:
• a metal substrate selected from the group consisting of lithium, sodium, and zinc;
• and
• a polymeric single-ion conductor coating formed on a surface of the metal substrate, the polymeric single-ion conductor coating formed of i) a metal salt of a sulfonated tetrafluoroethylene-based fluoropolymer copolymer or ii) a polymeric metal salt having an initial polymeric backbone and pendent metal salt groups attached to the initial polymeric backbone;
• wherein the polymeric single-ion conductor coating faces the positive electrode.