Abstract: It is an object to provide a high ion conductive solid electrolyte which uses organic and inorganic complex compound having water absorption and water resistance and to provide an electrochemical system using the high ion conductive solid electrolyte. The high ion conductive solid electrolyte is composed of a complex compound including water that has zirconic acid compound and polyvinyl alcohol. An aqueous solution in which zirconium salt or oxyzirconnium salt and polyvinyl alcohol are dissolved is neutralized by alkali. After removing water used as solvent, unnecessary salts are removed from the neutralized solution. The high ion conductive solid electrolyte is obtained which is composed of the complex compound having zirconic acid compound, polyvinyl alcohol, and water. Various electrochemical systems are obtained each of which use the high ion conductive solid electrolyte.

Abstract: An object of the present invention is to provide a low cost and highly ionic conductive solid electrolyte which is an organic-inorganic composite compound and is water-absorbing as well as water-resistive. Another object of the present invention is to provide electrochemical systems utilizing the above-mentioned electrolyte. The solid electrolyte of the present invention is a composite compound comprising tungstic and/or molybdic acid compound and polyvinylalcohol (PVA), and containing water. Tungstate and/or molybdate and other salt are neutralized by an acid in the aqueous solution dissolving PVA. Then, the water as the solvent of the aqueous solution is removed, and then the unnecessary salts are removed, thereby obtaining the composite compound.

Abstract: Provided is a hydrogen occlusion alloy suitable for a negative electrode material of a closed type nickel hydride secondary cell in which the increase of gas pressure in the cell during overcharging is prevented and self discharge in the open circuit state would be effectively inhibited, being represented by the following compositional formula: ANiaCobMncXd wherein A is a misch metal containing not more than 60% by weight of Ce, X is at least one element selected from the group consisting of Al, CU, Mo and Zn, and a, b, c and d are numbers satisfying the following relations: 0.4 <b<2.0, 0.ltoreq.c<0.2, 0.1<d<2.0, and 4.55<a+b+c+d<4.80.

Abstract: Disclosed is a novel process for preparing a compound, in which materials difficult to prepare at low temperature can be prepared even if the temperature is such a low temperature as room temperature. In this process, a solid catalyst is disposed in a vessel, a sub-reaction field f is formed on the surface of the solid catalyst, and materials for reaction are supplied to the sub-reaction field f whereby the reaction is progressed to synthesize an objective compound.

Abstract: A nickel hydroxide electrode useful in an alkaline secondary battery containing at least one of a copper-based additive or a manganese-based additive in either a nickel hydrogen active material as applied to a porous metal substrate, in a porous metal substrate itself, or both. The copper-based additive is at least member of the group consisting of copper, cuprous oxide and cupric oxide. The manganese-based additive is at least member of the group consisting of metal manganese, MnO, Mn.sub.2 O.sub.3, Mn.sub.3 O.sub.4, MnO.sub.2, MnO.sub.3, Mn.sub.2 O.sub.7, Mn(OH).sub.2, MnCO.sub.3, K.sub.2 MnO.sub.2, and KMnO.sub.4. When the additive is used in a positive electrode for an alkaline secondary battery, the rate of absorption of hydrogen gas generated in the battery is accelerated resulting in a reduction of the internal pressure of the battery.