Lead-acid battery

Patent metadata

Field	Value
Publication number	US-12567578-B2
Application number	US-202017614889-A
Country	US
Kind code	B2
Filing date	May 29, 2020
Priority date	May 31, 2019
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

A lead-acid battery includes a positive electrode plate, a negative electrode plate, and an electrolyte solution. The negative electrode plate includes a negative electrode material. The negative electrode material contains a polymer compound, and the polymer compound has a peak in a range of 3.2 ppm or more and 3.8 ppm or less in a chemical shift of 1 H-NMR spectrum. Alternatively, the negative electrode material contains a polymer compound having a repeating structure of oxy C 2-4 alkylene units. A ratio: C n /S n of a content C n of the polymer compound in the negative electrode material to a specific surface area S n of the negative electrode material is 25 ppm·m −2 ·g or more.

First claim

The invention claimed is:

1 . A lead-acid battery comprising a positive electrode plate, a negative electrode plate, and an electrolyte solution,
wherein the negative electrode plate includes a negative electrode material, the negative electrode material contains a polymer compound having a repeating structure of oxy C 2-4 alkylene units, and a ratio: C n /S n of a content C n of the polymer compound in the negative electrode material to a specific surface area S n of the negative electrode material is 25 ppm·m −2 ·g or more, the specific surface area S n of the negative electrode material being a BET specific surface area determined by a gas adsorption method using nitrogen gas.

2 . The lead-acid battery according to claim 1 , wherein the ratio C n /S n is 800 ppm·m −2 ·g or less.

3 . The lead-acid battery according to claim 1 , wherein the ratio C n /S n is 450 ppm·m −2 ·g or less.

4 . The lead-acid battery according to claim 1 , wherein the ratio C n /S n is 90 ppm·m −2 ·g or more and 410 ppm·m −2 ·g or less.

5 . The lead-acid battery according to claim 1 , wherein the specific surface area S n is 0.5 m 2 ·g −1 or more.

6 . The lead-acid battery according to claim 1 , wherein the negative electrode material contains a carbonaceous material, and
a content C c of the carbonaceous material in the negative electrode material is 0.45% by mass or more.

7 . The lead-acid battery according to claim 1 , wherein the polymer compound contains at least one selected from the group consisting of an etherified product of a hydroxy compound having a repeating structure of the oxy C 2-4 alkylene units and an esterified product of a hydroxy compound having the repeating structure of the oxy C 2-4 alkylene units, and
the hydroxy compound is at least one selected from the group consisting of a poly C 2-4 alkylene glycol, a copolymer having a repeating structure of oxy C 2-4 alkylene, and a C 2-4 alkylene oxide adduct of a polyol.

8 . The lead-acid battery according to claim 1 , wherein the repeating structure of the oxy C 2-4 alkylene units contains at least a repeating structure of oxypropylene units.

9 . The lead-acid battery according to claim 1 , wherein the polymer compound contains at least a compound having a number average molecular weight of 1,000 or more.

10 . The lead-acid battery according to claim 1 , wherein the negative electrode material further contains a first organic expander having a sulfur element content of 2,000 μmol/g or more.

11 . The lead-acid battery according to claim 10 , wherein the first organic expander contains a condensate containing a unit of an aromatic compound having a sulfur-containing group, and
the condensate contains, as the unit of the aromatic compound, at least one selected from the group consisting of a unit of a bisarene compound and a unit of a monocyclic aromatic compound.

12 . The lead-acid battery according to claim 11 , wherein the condensate contains the unit of the bisarene compound and the unit of the monocyclic aromatic compound.

13 . The lead-acid battery according to claim 11 , wherein the unit of the monocyclic aromatic compound includes a unit of a hydroxyarene compound.

14 . The lead-acid battery according to claim 1 , wherein the negative electrode material further contains a second organic expander having a sulfur element content of less than 2,000 μmol/g.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Kagohashi Hiroki

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/06 Primary

  Lead-acid accumulators (semi-lead accumulators H01M10/20) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title