(CN1247639-A)      Battery comprises at least one anode (14) and at least one cathode (15) sandwiching at least one electrolyte (16) comprising a soluble amorphous thermoplastic polyimide and a lithium salt. The anode comprises an anode current collector (11), soluble amorphous thermoplastic polyimide, electroconductive fillers and intercalation materials. The cathode comprises a cathode current collector (12), a polyimide, an electroconductive filler and a metal oxide.    Also claimed are: (a) the electrolyte described above; and (b) the preparation of the battery described above.    The electrodes also contain a lithium salt selected from LiCl, LiBr, Li(ClO4), Li(BF4), Li(PF6), Li(AsF6), Li(CH3CO2), Li(CF3SO3), Li(CF3SO2)2N, Li(CF3CO2), Li(CF3SO2)3, Li(B(C6H5)4), Li(SCN) and Li(NO3), preferably Li(PF6). The anode current collector comprises an expanded metal foil having apertures, preferably of Al. The cathode current collector comprises an expanded metal foil with apertures, preferably of Cu. The intercalation material is selected from (activated) C, graphite, petroleum coke, a Li alloy, Ni powder and low voltage Li intercalation compound. The metal oxide is selected from LiCoO2, LiMnO2, LiNiO2, V2O5 and LiMn2O4.    The electrolyte comprises 2-10 wt.% polyimide and 1-12 wt.% Li salt selected from those listed above.    ADVANTAGE -   The electrolyte does not require swelling or introduction of plasticisers. The battery has good interlayer adhesion, is capable of dissolving a large amount of lithium salt, is environmentally safe and has high ionic conductivity, which changes little with environmental conditions. The battery preparation requires no pre-treatment of current collectors, no curing of polyimide, no heating above tg of polyimide, and no high temperature and pressure. The battery has high flexibility.    (EP1008197-A1)      Battery comprises at least one anode (14) and at least one cathode (15) sandwiching at least one electrolyte (16) comprising a soluble amorphous thermoplastic polyimide and a lithium salt. The anode comprises an anode current collector (11), soluble amorphous thermoplastic polyimide, electroconductive fillers and intercalation materials. The cathode comprises a cathode current collector (12), a polyimide, an electroconductive filler and a metal oxide.    Also claimed are: (a) the electrolyte described above; and (b) the preparation of the battery described above.    The electrodes also contain a lithium salt selected from LiCl, LiBr, Li(ClO4), Li(BF4), Li(PF6), Li(AsF6), Li(CH3CO2), Li(CF3SO3), Li(CF3SO2)2N, Li(CF3CO2), Li(CF3SO2)3, Li(B(C6H5)4), Li(SCN) and Li(NO3), preferably Li(PF6). The anode current collector comprises an expanded metal foil having apertures, preferably of Al. The cathode current collector comprises an expanded metal foil with apertures, preferably of Cu. The intercalation material is selected from (activated) C, graphite, petroleum coke, a Li alloy, Ni powder and low voltage Li intercalation compound. The metal oxide is selected from LiCoO2, LiMnO2, LiNiO2, V2O5 and LiMn2O4.    The electrolyte comprises 2-10 wt.% polyimide and 1-12 wt.% Li salt selected from those listed above.    ADVANTAGE -   The electrolyte does not require swelling or introduction of plasticisers. The battery has good interlayer adhesion, is capable of dissolving a large amount of lithium salt, is environmentally safe and has high ionic conductivity, which changes little with environmental conditions. The battery preparation requires no pre-treatment of current collectors, no curing of polyimide, no heating above tg of polyimide, and no high temperature and pressure. The battery has high flexibility.