US 12,567,652 B2Granted

Zinc secondary battery

AssigneeToyota Jidosha Kabushiki Kaisha

InventorHiroshi Suyama

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Abstract

The present disclosure provides a zinc secondary battery with an improved cycle characteristic. The zinc secondary battery of the disclosure has a positive electrode layer, a covering film-attached porous film layer and a negative electrode layer in that order, with an electrolyte solution impregnating the positive electrode layer, the covering film-attached porous film layer and the negative electrode layer, wherein the covering film-attached porous film layer has a porous film layer and a porous covering film formed on the porous film layer, the covering film-attached porous film layer is directly adjacent to the negative electrode layer, and the porous covering film comprises at least one compound selected from the group consisting of Mg(OH)2, Mg2P2O7, MgTiO3, MgCO3, Ca(OH)2, CaSO4, Ca2P2O7, SrTiO3, SrF2, TiO2, SnO2, Zr(OH)4 and ZrO2.

Claims5

Dependent claims

A zinc secondary battery having a positive electrode layer, a covering film-attached porous film layer and a negative electrode layer in that order, with an electrolyte solution impregnating the positive electrode layer, the covering film-attached porous film layer and the negative electrode layer:

wherein the covering film-attached porous film layer has a first porous film layer and a porous covering film formed on the first porous film layer,
wherein the porous covering film is directly adjacent to the negative electrode layer,
wherein the porous covering film comprises at least one compound selected from the group consisting of Mg(OH)2, Mg2P2O7, MgTiO3, MgCO3, Ca(OH)2, CaSO4, Ca2P2O7, SrTiO3, SrF2, TiO2, SnO2, Zr(OH)4 and ZrO2
wherein the zinc secondary battery further has a nonwoven fabric layer further toward the positive electrode layer side than the covering film-attached porous film layer,
wherein the zinc secondary battery further has a second porous film layer further toward the positive electrode layer side than the nonwoven fabric layer, and
wherein the first and second porous film layers are sponge-like resin film layers.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/186,241Filed 20 Mar 2023
Priority: JP 2022-08232519 May 2022
Published: US 2023/0378608 A123 Nov 2023
Granted: 3 Mar 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H01M 10/281
Construction or manufacture: large cells or batteries with stacks of plate-like electrodes
H01M 50/451
Having a layered structure: comprising layers of only organic material and layers containing inorganic material
H01M 4/244
Electrodes for alkaline accumulators: zinc electrodes
H01M 10/24
Secondary cells; Manufacture thereof: alkaline accumulators