(US4634636-A)      Polyacetylene composite comprises a polyacetylene polymer having a coating contg. an ionic cpd. of formula (I). In the formula, m is alkali metal; R1-4 are H, (un)substd. 1-5C alkyl or (un)substd. 1-5C alkoxy, or R1 and R2 or R3 and R4 combine to form a cyclic structure; and X and Y are O or O-CO-O.    Pref. ionic cpds. include alkoxide and semicarbonic ester derivs of 1,2-glycol. The polyacetylene may be n-doped.    USE/ADVANTAGE -   Stability of the n-doped polyacetylene is improved and electrochemical reversibility enhanced. The composite can be used as the negative electrode of a sec. battery having excellent protracted charge-discharge, self discharge and voltage maintaining properties. (25pp)    (US4686160-A)      Sec. battery negative electrode comprises an n-doped polyacetylene composite coated with an ionic organic cpd. of formula (I) as active material. In the formula, M is alkali metal; X and Y are O or O-CO-O; R1-4 are H, (un)substd. 1-5C alkyl or 1-5C alkoxy; or CR1R2 or CR3R4 form cyclic structures.    Specifically, cpd. (I) may be an orthoester deriv., alkoxide deriv. of 1,2-glycol or semicarbonic ester deriv. of 1,2-glycol.    ADVANTAGE -   The coated n-doped polyacetylene is highly stable. The battery is improved w.r.t. protracted charge-discharge cycle, self-discharge property and voltage-maintaining property. (18pp)r    (US4748047-A)      Prodn. of a polyacetylene composite comprises applying a soln. contg. ionic organic cpd. of formula (I) to a polyacetylene, then drying the coated polymer. In the formula, M is alkali metal; X and Y are O or O-CO-O; and R1-4 are H, (un)substd. 1-5C alkyl or (un)substd. 1-5C aloxy; or R1 and R2 or R3 and R4 combine to form a cyclic structure.    USE/ADVANTAGE -   For prodn. of n-doped polyactylenes exhibiting improved stability, allowing use a negative electrodes in non-aq. sec. batteries. (17pp)e    (JP93034781-B)      Composite comprises a polyacetylene polymer and a coating formed on the polymer with an ionic organic cpd(s). of formula (I) (where M = alkali metal; X, Y same or different = -O or -O-CO-O; R1-4 = H, opt. substd. 1-5C alkyl, opt. substd. 1-5C alkoxy or R1R2 or R3R4 form a cyclic structure).    Prodn. of the composite comprises applying to the polyacetylene polymer a soln. contg. (I) and drying the coated polymer.    USE/ADVANTAGE -   Used as an n-doped composite negative electrode active substance for a battery, the composite being that as above, and the positive electrode active substance is Li1-xCoO2 (where x = 0.1). The battery which uses the composite has excellent charge-discharge cycle properties, self-discharge properties and voltage-maintaining properties. (J60125665-A)