TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Electrode: The voids within a layer of (E1) are further filled with (c1) and (d1).Preferred Components: (a1) are carbon particles.Preferred Method: The solution of (c1) and (d1) is applied to the electrode surface, causing the solution to permeate (E1) and solidifying the solution to fill voids in the layer of (E1) with (c1) and (d1).    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymers: (b1) is a polymer containing a repeating unit of vinylidene fluoride as a main component and (c1) is a polyether-based polymer. (b1) is 3 - 70 mass.% of the total amount of (b1) and (c1). EXAMPLE - A test carbon electrode was prepared using carbon powder, graphite with a mean particle size of 3 microns. Homopolymer of vinylidene fluoride (PVDF) was used as a binder polymer and a polyether based network polymer (PEL) was used as polar polymer. LiN(SO2C2F5)2 (BETI) was use as lithium salt. The mass percent of graphite was the same as the total mass percent of PEL and PVDF (50%). BETI was added to the mixture of graphite, PEL and PVDF such that the ratio of the number of oxygen atoms, to the number of lithium atoms in PEL was 16:1. Azobisisobutyronitrile (0.1 mass.%) was added as thermal polymerization initiator and N-methylpyrrolidone (NMP) was added as a solvent. The obtained mixture was thoroughly stirred to prepare slurry. The slurry was applied to nickel foil, heated and dried at 90 degrees C for more than 2 hours to produce carbon electrode. The negative electrode was produced by changing a weight ratio of PEL to PVDF. The carbon negative electrode was punched out and was dried at 90 degrees C for half a day under high vacuum. In a glove box with argon atmosphere, a solid polymer electrolyte film containing PEL (53 mass.%) and BETI (26 mass.%) with a thickness of 100 microns was sandwiched by the punched-out carbon negative electrode and the lithium metal used as a counter electrode. The charge/discharge durability evaluation (CDDE) was performed for the produced coin cell. As comparative electrode a carbon electrode was prepared similarly without PVDF and assembled into a coin cell for CDDE. The ratio of discharge capacity to the initial discharge capacity was (%) 95/20 for test/comparative. Thus the cycle durability of the test electrode was significantly improved compared to comparative electrode without binder polymer. Also by filling the voids of the electrode with a solid polymer electrolyte, reactivity was improved.