Nippon Kodoshi Corporation

Naoya Kawazawa

Masahiro Kuroiwa

Norihiro Wada

Kenta Morimoto

Kentaro Ogawa

A separator for alkaline batteries, which exhibits excellent strength, dimensional stability and chemical stability in an electrolyte solution, while having high shielding properties, high liquid holding properties and low resistance. A separator for alkaline batteries, which is used for the purpose of separating a positive electrode active material and a negative electrode active material from each other, and holding an electrolyte solution, and which is obtained by stacking and integrating a fiber layer A that has a density of 0.52-0.62 g/cmand a thickness of 25-35 μm and a fiber layer B that has a density of 0.40-0.50 g/cmand a thickness of 25-35 μm, so that the entirety of the separator has a density of 0.45-0.57 g/cmand a thickness of 50-70 μm.

Separator for alkaline batteries, and alkaline battery

The present invention provides a separator for alkaline batteries and an alkaline battery improving reliability of prevention in internal short-circuits, and having good liquid retention and shielding property. To achieve this, the separator for alkaline batteries is made from a wet nonwoven fabric which contains at least alkali-resistant cellulose fibers and alkali-resistant synthetic fibers bound using a binder component; wherein an average pore diameter of the wet nonwoven fabric is 1 to 10 &#x3bc;m. Moreover, the separator for alkaline batteries uses the wet nonwoven fabric having a maximum pore diameter of 20 to 60 &#x3bc;m, a liquid retention rate of 400 to 700% during immersion in a 40% by mass KOH solution, and a swelling ratio of 30 to 45% during immersion in a 40% by mass KOH solution.

Growing community of inventors

Kochi, Japan

Naoya Kawazawa