(US4442187-A)      Secondary battery comprises electrodes including as active material a polymer having conjugated unsatn. along a main backbone chain. The polymer is electrochemically oxidisable to a p-type doped material and electrochemically reducible to an n-type doped material. The battery electrolyte comprises a cpd. which is ionisable into anionic or cationic dopant species capable of doping the polymer to the oxidised or reduced state.    The battery has high energy and power density, low overall wt. and size and high output current w.r.t. electrode area and wt.. (17pp)m    (US4728589-A)      A secondary battery contains in at least 1 electrode as electrode active material a conjugated polymer having conjugated unsaturation along a main backbone chain. The polymer has been oxidised or reduced to an electrically conducting state, when it is doped with at least 1 ionic dopant species (IDS) to a p-type electrically conducting state. The electrolyte in the battery contains the IDS or a cpd. ionisable to form the IDS. The electrolyte is non-aq. and inert towards the electrodes. The IDS is ClO4-, PF6-, AsF6-, AsF4-, SO3CF3- or BF4-.    The cathode pref. contains the polymer, suitably e.g. an acetylene polymer, poly(p-phenylene), and the anode consists of an anode active metal, whose Pauling electronegativity is not more than 1.6, pref. not more than 1.0 and is esp. Li.    USE/ADVANTAGE -   For lightweight, high energy density and high power density sec. batteries; a more efficient and economical process for doping the polymer; doping can be more precisely controlled and is more uniform; a wider variety of dopants than previously can be used. (16pp)    (US4801512-A)      In a sec. battery, at least one electrode comprises, as active material, a conjugated polymer having conjugated unsatn. along a main backbone chain and being either oxidised or reduced to a conductive state where it is doped with an ionic dopant species. The battery electrolyte comprises the ionic species or a cpd. ionisable to the species. The electrolyte is non-aq. and inert to the electrodes.    Suitably, the polymer is doped with a cation of a metal having Pauling electronegativity value 1.6 or less, or with an organic cation of formula R4-xMHx or R3E(+), where R is alkyl or aryl, M is N, P or As, E is O or S, and x is 0-4.    ADVANTAGE -   The battery may exhibit high energy density, high power density,low overall wt. and size and high output current w.r.t. electrode area and wt. (16pp)