US 12,456,781 B2
Separator for alkaline batteries, and alkaline battery
Masahiro Kuroiwa, Kochi (JP); Kenta Morimoto, Kochi (JP); Norihiro Wada, Kochi (JP); and Naoya Kawazawa, Kochi (JP)
Assigned to NIPPON KODOSHI CORPORATION, Kochi (JP)
Appl. No. 17/440,055
Filed by NIPPON KODOSHI CORPORATION, Kochi (JP)
PCT Filed Feb. 7, 2020, PCT No. PCT/JP2020/004936
§ 371(c)(1), (2) Date Sep. 16, 2021,
PCT Pub. No. WO2020/195238, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-054784 (JP), filed on Mar. 22, 2019.
Prior Publication US 2022/0190443 A1, Jun. 16, 2022
Int. Cl. H01M 50/457 (2021.01); H01M 50/409 (2021.01); H01M 50/44 (2021.01); H01M 50/489 (2021.01)
CPC H01M 50/457 (2021.01) [H01M 50/409 (2021.01); H01M 50/44 (2021.01); H01M 50/489 (2021.01); H01M 2300/0014 (2013.01)] 5 Claims
OG exemplary drawing
 
1. 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 integrally stacking
a fiber layer A that has a density of 0.52 to 0.62 g/cm3 and a thickness of 25 to 35 μm and
a fiber layer B that has a density of 0.40 to 0.50 g/cm3 and a thickness of 25 to 35 μm,
so that the entirety of the separator has a density of 0.45 to 0.57 g/cm3 and a thickness of 50 to 70 μm, wherein
the fiber layer A and the fiber layer B contain 60 to 90% by mass of an alkali-resistant cellulose fiber and 10 to 40% by mass of an alkali-resistant synthetic fiber,
the alkali-resistant cellulose fiber is a dissolving pulp or a mercerized pulp,
the alkali-resistant synthetic fiber is a vinylon fiber obtained by acetalizing hydroxyl groups of a polyvinyl alcohol fiber,
the fiber layer A does not contain a polyvinyl alcohol resin, and
the fiber layer B contains a polyvinyl alcohol resin in an amount of 0.3 to 1.5 g/m2.