TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The proportion of total mass of the binder and the first polar polymer in (C1) is 5 - 30 wt.% based on the mass of electrode active material (preferably carbon material). The proportion of mass of the first polar polymer is 3 - 50 wt.% based on the total mass of the binder and the first polar polymer. The binder is polyvinylidene fluoride or a copolymer of vinylidene fluoride with a compound copolymerizable with vinylidene fluoride. The first and second polar polymers are polyether cross-linked by cross-linkable functional group. EXAMPLE - A slurry comprising a carbon material (graphite), a copolymer of vinylidene fluoride and hexafluoropropylene (c), and a polyether    (a) synthesized according to method J. Electrochem. Soc., 145 (1998) 1521 having mass ratio of 89:19:1, and LiN(SO2C2F5)2 (b) was prepared. N-methyl-2-pyrrolidone was used as a solvent. The sufficiently stirred slurry was applied using a coder on a nickel foil as a collector and dried at 90degreesC for 2 hours to produce active material layer (L1). A solution of    (a) (8 g), (b) (4.5 g) and azobisisobutyronitrile was prepared and applied on (L1) and dried in a vacuum drier at room temperature to 110degreesC for 5 hours to obtain cross-linked polar polymer. A solution containing (wt.%):    (a) (53), (b) (26) and benzyl dimethyl ketal (0.1) in dry acetonitrile was prepared and irradiated with ultraviolet rays for 20 minutes to cross-link the polar polymer to make membrane of the solution. It was then removed and dried by heating at 90degreesC for 12 hours under a vacuum to obtain intrinsic electrolyte membrane. The above electrolyte was sandwiched between the positive electrode and the negative electrode to produce a coin cell (test) as a secondary battery. A comparative cell was prepared similarly without using (c). Both cells were subjected to charge and discharge test. The discharge capacity after repetition of charge and discharge after 20 cycles for test/comparative was 85/20%. The results showed that the electrode containing binder and first polar polymer in the first active material layer components exhibits excellent in cycle property as compared to the control electrode containing no first polar polymer in the first active material layer components.