# What are polydisulfide polymers?

What are polydisulfide polymers? How are these polymers applicable in energy sectors such as rechargeable batteries?

Disulfide batteries use a redox shuttle between disulfide bonds ($\ce{R-SS-R}$) and two thiolates ($\ce{R-S-}$), e.g.:
Often the counter-ions are $\ce{Li+}$ but this is hardly a requirement. Since two electrons can be transferred in the charging / discharging cycle, the theoretical energy density is very high.