TECHNOLOGY FOCUS - POLYMERS - Preferred Structure: The polymer forming porous second layer partially penetrates the pores of the porous first laminate layer. The polymer forming the first layer has single or multiple layers of polymers chosen from polyethylene, polypropylene and a blended mixture of polyalkenes. The polymer forming the second layer is chosen from polyethylene oxide, polytetra- fluoroethylene (PTFE) or polyvinylidene fluoride. Alternatively, the composite may contain 3 layers, where the third layer is another continuous layer of the second layer forming polymer, deposited on other faces of the first polymeric laminate layer.Preferred Process: The second polymer layer is deposited on the first porous laminate layer by electrophoresis, vapor deposition, coating of a suspension of polymer or immersion of the first polymer laminate in a polymer emulsion. SPECIFIC COMPOUNDS - The lithium compound having dissociable lithium ions and the lithium salt dissolved in organic liquid are chosen from lithium triflate, lithium borohexafluoride, lithium phosphohexafluoride, lithium arsenofluoride and lithium perchlorate. The organic liquid is ethylene carbonate, dimethyl carbonate, methyl-ethyl carbonate and/or propylene carbonate.    EXAMPLE - A rechargeable lithium battery was assembled having lithium-cobalt oxide positive electrode layer and graphite negative electrode layer, both mixed with 5 wt.% polyvinylidene fluoride (PVDF) as binder. The electrolyte consisted of microporous polyethylene and polypropylene multilayered polymer laminate (Celgard 2300), dipped in a suspension of submicroscopic polyethylene oxide particles containing 5-8 wt.% lithium phospho- hexafluoride (LiPF6).    The polyethylene oxide was suspended in a 1:1 mixture of acetone and n-methyl pyrrolidone (NMP) to form a suspension containing 30 wt.% solids. The suspension coating on the polymer laminate was allowed to dry and dried polyethylene oxide layer was filled in 15% of the pores of the Celgard 2300 layer.    The electrolyte layer was placed between electrodes and impregnated with an ethylene carbonate-dimethyl carbonate solution containing LiPF6 in 1 mol concentration. The obtained battery was packaged and sealed.    The active surface area of lithium battery was 600 cm2. The battery was cycled between 4.2 volts and 3 volts, charging and discharging at 400 mA. The voltage drop at 400 mA current was measured to be 40 mV, yielding a value of calculated electrolyte resistance of 60 ohm.cm. The capacity of the battery was 3200 mA/h which diminished slightly, only after 50 cycling.