ALKALINE SECONDARY BATTERY AND METHOD FOR MANUFACTURING ALKALINE SECONDARY BATTERY

• Main Authors: SHIMIZU YUSUKE, MUROTA YOSUKE
• Format: Patent
• Language: English; Japanese
• Published: 17.01.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To effectively suppress the formation of Ni2O3H in an alkaline secondary battery.SOLUTION: A nickel metal hydride storage battery includes: a positive electrode plate 2 composed of a positive electrode substrate 21 made of porous Ni or an Ni alloy and a positive electrode mixture layer containing particles 22a of a positive electrode active material mainly composed of Ni(OH)2 filled in the positive electrode substrate 21; and an alkaline electrolyte 24, wherein NiO dendrites are continuously present in the form of dendrites from the positive electrode base material 21 to a particle surface 22b of the positive electrode active material, and at the surface 22b, 0.245≤NiO/Ni(OH)2≤1.77 is satisfied.SELECTED DRAWING: Figure 3 【課題】アルカリ二次電池において効果的にＮｉ２Ｏ３Ｈの生成を抑制すること。【解決手段】多孔性のＮｉ若しくはＮｉ合金からなる正極基材２１と正極基材２１充填されたＮｉ（ＯＨ）２を主体とする正極活物質の粒子２２ａを含む正極合材層とからなる正極板２と、アルカリ電解液２４とを備えたニッケル水素蓄電池において、正極基材２１から正極活物質の粒子表面２２ｂにＮｉＯのデンドライトを連続して樹枝状に存在させ、その表面２２ｂにおいて、０．２４５≦ＮｉＯ／Ｎｉ（ＯＨ）２≦１．７７とした。【選択図】図３