Sulfur-containing compounds and polymers and the use thereof in electrochemical cells

Polymer of Formula I:

• wherein:
• A is selected from unsaturated groups allowing the delocalization of electrons, for example, substituted or unsubstituted aryl and heteroaryl groups, and their fused or unfused polycyclic equivalents;
• R is a substituted or unsubstituted organic linking group selected from linear or branched C2-6 alkylene, linear or branched C2-6 alkyleneoxy, linear or branched C2-6alkyleneglycol, linear or branched C2-6 alkyleneoxyC2-6 alkylene, linear or branched poly(C2-6 alkyleneglycol), C6-12arylene, C3-12cycloalkylene, C5-12heteroarylene, and C3-12 heterocycloalkylene;
• m represents the average number of sulfur atoms inserted into the disulfide bond of the polymer links and cannot be zero, i.e. m>0, for example, 0<m≤8, or 1≤m≤6, or 1≤m≤4;
• and
• n represents the average number of units in the polymer, for example, n may be in the range of 2 to 500, or of 5 to 300.