Secondary electrochemical element comprising 1.1 a negative electrode containing 1.1.1 an output conductor, 1.1.2 as carbon-based storage material which enables the storage of electrical charge in the electrode through formation of an electrical double layer (Helmholtz double layer), activated carbon and/or graphene and 1.1.3 a non-carbon-based H2 storage material which can chemisorb hydrogen and/or store it in the form of a metal hydride, 1.2 a positive electrode containing 1.2.1 an output conductor and 1.2.2 nickel hydroxide and/or nickel oxyhydroxide, 1.3 a porous separator which separates the negative electrode and the positive electrode from one another, and 1.4 an aqueous alkaline electrolyte with which the electrodes and the separator are soaked, wherein 1.5 the negative electrode contains the carbon-based storage material in a proportion of between 5% by weight and 14.9% by weight, 1.6 the negative electrode comprises the H2 storage material in a proportion between 85% by weight and 94.9% by weight, 1.7 the negative electrode comprises an electrode binder in a proportion between 0.1% by weight and 10% by weight, 1.8 the carbon-based storage material and the H2 storage material have a homogeneous distribution in the negative electrode, characterized in that 1.9 the H2 storage material is an AB 2 alloy, an AB 5 alloy, an A 2 B 7 alloy or an AB 3 alloy, and 1.10 the output conductor of the positive electrode and the negative electrode is formed of a metallic foam. 1.1 a negative electrode containing 1.1.1 an output conductor, 1.1.2 as carbon-based storage material which enables the storage of electrical charge in the electrode through formation of an electrical double layer (Helmholtz double layer), activated carbon and/or graphene and 1.1.3 a non-carbon-based H2 storage material which can chemisorb hydrogen and/or store it in the form of a metal hydride, 1.1.1 an output conductor, 1.1.2 as carbon-based storage material which enables the storage of electrical charge in the electrode through formation of an electrical double layer (Helmholtz double layer), activated carbon and/or graphene and 1.1.3 a non-carbon-based H2 storage material which can chemisorb hydrogen and/or store it in the form of a metal hydride, 1.2 a positive electrode containing 1.2.1 an output conductor and 1.2.2 nickel hydroxide and/or nickel oxyhydroxide, 1.2.1 an output conductor and 1.2.2 nickel hydroxide and/or nickel oxyhydroxide, 1.3 a porous separator which separates the negative electrode and the positive electrode from one another, and 1.4 an aqueous alkaline electrolyte with which the electrodes and the separator are soaked, wherein 1.5 the negative electrode contains the carbon-based storage material in a proportion of between 5% by weight and 14.9% by weight, 1.6 the negative electrode comprises the H2 storage material in a proportion between 85% by weight and 94.9% by weight, 1.7 the negative electrode comprises an electrode binder in a proportion between 0.1% by weight and 10% by weight, 1.8 the carbon-based storage material and the H2 storage material have a homogeneous distribution in the negative electrode, characterized in that 1.9 the H2 storage material is an AB 2 alloy, an AB 5 alloy, an A 2 B 7 alloy or an AB 3 alloy, and 1.10 the output conductor of the positive electrode and the negative electrode is formed of a metallic foam.