A battery includes a battery cell including a positive electrode plate and a negative electrode plate. At least one of the positive electrode plate or the negative electrode plate includes a polymer that includes an aldehyde ketone polymer. The aldehyde ketone polymer has a slope K of an elastic modulus G-loss modulus G curve that is measured by subjecting a sheet-like structure formed of the aldehyde ketone polymer to dynamic frequency scanning tests at (Tm+20) C., and 0.8K<, where Tm C. represents the melting temperature of the aldehyde ketone polymer.

An electrode plate includes a current collector and a film layer comprising an active material and an adsorptive polymer disposed on at least one side of the current collector, wherein: the adsorptive polymer satisfies: 3m.sub.1/n35, in which n represent a mass of the adsorptive polymer, and m.sub.1 represents a mass of a first substance that is obtained by: adding the adsorptive polymer to a predetermined electrolytic solution at 45 C. to form a polymer system, allowing the polymer system to stand for 60 hours at 45 C. and for 24 hours at 25 C., and then filtering the polymer system through a 200-mesh screen to obtain the first substance; and the adsorptive polymer further satisfies: 1.00m.sub.2/n1.05, in which m.sub.2 represents a mass of a second substance, that is obtained by drying the first substance at 60 C. for 24 hours.

A curable composition includesa first component containing aldehyde group-containing compounds which include at least one compound with two or more aldehyde groups anda second component containing 1,3 keto ester group-containing compounds which include at least one compound with two or more 1,3 keto ester groups of the formula (I), wherein the average molecular weight M.sub.n of at least one of the two components, with respect to the aldehyde or 1,3 keto ester group-containing compounds, ranges from 400 to 20,000 g/mol. The composition is largely free of toxic ingredients and cures in ambient conditions using conventional catalysts quickly in order to form a non-tacky elastic polymer with a high degree of strength and elasticity. The composition is particularly suitable for use as an elastic adhesive, sealant, or coating with a high degree of robustness during production, storage, and processing as well as a high degree of resistance after curing.

A curable composition includesa first component containing aldehyde group-containing compounds which include at least one compound with two or more aldehyde groups anda second component containing 1,3 keto ester group-containing compounds which include at least one compound with two or more 1,3 keto ester groups of the formula (I), wherein the average molecular weight M.sub.n of at least one of the two components, with respect to the aldehyde or 1,3 keto ester group-containing compounds, ranges from 400 to 20,000 g/mol. The composition is largely free of toxic ingredients and cures in ambient conditions using conventional catalysts quickly in order to form a non-tacky elastic polymer with a high degree of strength and elasticity. The composition is particularly suitable for use as an elastic adhesive, sealant, or coating with a high degree of robustness during production, storage, and processing as well as a high degree of resistance after curing.