TECHNOLOGY FOCUS - POLYMERS - Preferred Component: Polymer is a homopolymer or copolymer of vinyl fluoride, vinylidene fluoride, trifluoroethylene, tetrafluoroethylene and/or hexafluoropropylene, preferably a copolymer of vinylidene fluoride and hexafluoropropylene, with molecular weight = 50000-500000 (100000-300000) and weight ratio of vinylidene fluoride to hexafluoropropylene = 80:20-90:10.Preferred Structure: Porous structure of separator is polyethylene, polypropylene, polycarbonate or cellulose.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Solvents: Solvents is:(a) alicyclic carbonate of formula (I), preferably ethylene or propylene carbonate;(b) aliphatic carbonates of formula (II), preferably dimethyl carbonate or diethyl carbonate;(c) cyclic ester lactone of formula (III), preferably gamma-valerolactone and/or gamma-butyrolactone;(d) ester of formula (IV), preferably acetate, more preferably (2-methoxy-ethyl) acetate or ethyl acetate; and(e) glyme of formula (V).-C(O)-O-C(R1)2 -(C(R1)2)m -C(R1)2-O- (I)R1 = H or 1-C alkylm = 0 or 1R2-(O-C(O))pO-R2 (II)R2 = 1-C alkylp = 1 or 2-C(O)-C(R3)2- C(R3)2- (C(R3)2)r- C(R3)2-O- (III)R3 = H or 1-2 C alkylr = 0 or 1R4-C(O)O-R4-(O-R4)t (IV)R4 = H or 1-2 C alkylt = 0, 1 or 2R5-O-(R6-O)n-R5 (V)R5 = 1-2 C alkyl (preferably methyl)R6 = -C(R7)2-C(R7)2-R7 = H (preferred) or 1-4 (1-2) C alkyln = 2-6 (3)    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: Salt is an alkali metal and/or ammonium salt, comprising ClO4-, CF3SO3-, AsF6-, PF6-, BF4-, and/or preferably LiPF6 and LiBF4.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Composition: Electrolyte comprises 63-94 (75-88) wt.% solvent, 5-25 (8-17) wt.% salt and 1-12 (4-8) wt.% polymer.Preferred Electrodes: Electrochemical cell has negative electrode structure comprising graphite, coke, mesocarbon microbeads, carbon black, aluminium, silicon and/or tin, preferably graphite and/or mesocarbon microbead, and a positive electrode structure comprising lithium manganese oxide, lithium cobalt oxide and/or lithium nickel oxide, preferably spinel LiMn2O4. Electrodes display such porosity as to allow diffusion of relatively solvent rich electrolyte phase into the pores of the electrodes, leaving relatively polymer rich electrolyte phase in the volume between the electrodes. The gap between electrode laminates of the electrochemical cell is smaller than at least the larger polymer particles, so that electrolyte close to the edge of the laminate and outside the laminate contains larger amount of polymer than the electrolyte contained between the electrodes.Preferred Method: Temperature Td = 45-80 (65-75) degrees C and gelling temperature Tg = 75-100 (80-90) degrees C, with the proviso that Tg more than Td. Electrochemical cell is wound prior to electrolyte impregnation. Electrolyte incorporation is carried out by pouring or injection.