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Polyacetylene, can be controllably doped electrochemically through the semiconducting to the metallic regime using a solution of in propylene carbonate and a lithium cathode. Flexible, golden, free‐standing films of having conductivities up to ∼103Ω−1 cm−1 are readily obtained. Electrochemical "undoping" of the allows this doped film to be used as the cathode‐active material in lightweight rechargeable storage batteries. The overall complete discharge reaction is
Nigrey et al. (Sat,) studied this question.