Lead-acid battery and method for producing lead-acid battery

Patent metadata

Field	Value
Publication number	US-10622634-B2
Application number	US-201615577468-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	May 29, 2015
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A negative electrode material of a negative electrode plate of a lead-acid battery includes an organic expander having a S element content of 3000 μmol/g or more.

First claim

The invention claimed is:

1. A lead-acid battery comprising a negative electrode material;
wherein the negative electrode material contains an organic expander, and
the organic expander contains a sulfur element (S element) in an amount of 4800 μmol/g or more.

2. The lead-acid battery according to claim 1 , further comprising a negative electrode current collector,
wherein the negative electrode current collector includes at least two horizontal frame ribs in an upper part and a lower part and at least two vertical frame ribs on a left part and a right part.

3. The lead-acid battery according to claim 1 , further comprising a negative electrode containing the negative electrode material,
wherein the amount of the sulfur element (S element) in the organic expander is measured as a sulfur element (S element) content in a powder sample obtained by taking out the negative electrode from the lead-acid battery, washing the negative electrode to remove a sulfuric acid component, separating the negative electrode material from the negative electrode freed of the sulfuric acid component, immersing the negative electrode material in a 1 mol/l NaOH aqueous solution, desalting the solution freed of an insoluble component by filtration, and then concentrating and drying the solution.

4. The lead-acid battery according to claim 3 , further comprising a negative electrode current collector,
wherein the negative electrode current collector includes at least two horizontal frame ribs in an upper part and a lower part and at least two vertical frame ribs on a left part and a right part.

5. The lead-acid battery according to claim 1 , wherein the organic expander has a sulfur element (S element) content of 4900 μmol/g or more.

6. The lead-acid battery according to claim 1 , wherein the organic expander has a sulfur element (S element) content of 4800 μmol/g or more and 6000 μmol/g or less.

7. The lead-acid battery according to claim 1 , wherein the organic expander has a sulfur element (S element) content of 4900 μmol/g or more and 6000 μmol/g or less.

8. The lead-acid battery according to claim 1 , wherein the negative electrode material contains the organic expander in an amount of 0.05 mass % or more and 0.5 mass % or less.

9. A method for producing a lead-acid battery, the method comprising:
filling a negative electrode material in a negative electrode current collector to prepare a negative electrode,
wherein
the negative electrode material contains an organic expander, and
the organic expander contains a sulfur element (S element) in an amount of 4800 μmol/g or more.

10. A method for measuring the amount of the sulfur element (S element) in the organic expander of the lead-acid battery produced by the method according to claim 9 , the method comprising:
obtaining a powder sample by taking out the negative electrode from the lead-acid battery, washing the negative electrode to remove a sulfuric acid component, separating the negative electrode material from the negative electrode freed of the sulfuric acid component, immersing the negative electrode material in a 1 mol/l NaOH aqueous solution, desalting the solution freed of an insoluble component by filtration, and then concentrating and drying the solution;
subjecting the obtained powder sample to an oxygen combustion flask method to convert a S element in 0.1 g of the organic expander into sulfuric acid to obtain an eluent; and
titrating the eluent with barium perchlorate using thorin as an indicator to determine the amount of the sulfur element (S element).

Assignees

• Gs Yuasa Int Ltd

Inventors

• Obuchi Susumu
• Motoi Ikumi

Classifications

• H01M10/12

  Construction or manufacture · CPC title

• H01M4/14

  Electrodes for lead-acid accumulators · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/20

  of pasted electrodes · CPC title

• H01M4/73

  for lead-acid accumulators, e.g. frame plates · CPC title