Battery member, method for manufacturing battery member, and secondary battery

Patent metadata

Field	Value
Publication number	US-12374718-B2
Application number	US-201917610154-A
Country	US
Kind code	B2
Filing date	May 22, 2019
Priority date	May 22, 2019
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A battery member includes: a current collector; an electrode mixture layer provided on the current collector; and an electrolyte layer provided on the electrode mixture layer, in which the electrode mixture layer contains an electrode active material, an organic solvent, a polymer, and an electrolyte salt, and the electrolyte layer contains a polymer, an oxide particle, and an electrolyte salt.

First claim

The invention claimed is:

1. A battery member comprising:
a current collector;
an electrode mixture layer provided on the current collector; and
an electrolyte layer provided on the electrode mixture layer,
wherein the electrode mixture layer comprises an electrode active material, an organic solvent, and an electrolyte salt,
the electrolyte layer is a pre-formed electrolyte sheet and comprises a polymer, an oxide particle, and an electrolyte salt,
wherein the polymer comprises a copolymer comprising a first structural unit selected from the group consisting of tetrafluoroethylene and vinylidene fluoride; and a second structural unit selected from the group consisting of hexafluoropropylene, acrylic acid, maleic acid, ethyl methacrylate, and methyl methacrylate, and
wherein a content of the first structural unit is 80% by mass or more based on a sum of contents of the first structural unit and the second structural unit.

2. The battery member according to claim 1 , wherein the organic solvent comprises a carbonic acid ester.

3. The battery member according to claim 1 , wherein the electrode mixture layer further comprises a polymer capable of gelling the organic solvent.

4. A secondary battery comprising the battery member according to claim 1 .

5. A method for manufacturing a battery member, the method comprising:
a step (a) of adding a composition comprising an organic solvent and an electrolyte salt into an electrode active material layer to form an electrode mixture layer, wherein the electrode active material layer comprises an electrode active material and is provided on a current collector; and
a step (b) of providing an electrolyte layer comprising a polymer, an oxide particle, and an electrolyte salt on the electrode mixture layer,
wherein the electrolyte layer is formed in a sheet form in advance of providing the electrolyte layer on the electrode mixture layer,
wherein the polymer comprises a copolymer comprising a first structural unit selected from the group consisting of tetrafluoroethylene and vinylidene fluoride; and a second structural unit selected from the group consisting of hexafluoropropylene, acrylic acid, maleic acid, ethyl methacrylate, and methyl methacrylate, and
wherein a content of the first structural unit is 80% by mass or more based on a sum of contents of the first structural unit and the second structural unit.

6. The method according to claim 5 , wherein the organic solvent comprises a carbonic acid ester.

7. The method according to claim 5 , wherein the composition further comprises a polymer capable of gelling the organic solvent.

8. The method according to claim 7 , further comprising a step of heating the composition before the step (a).

9. The method according to claim 5 , wherein the composition further comprises a polymerizable compound, and
the polymerizable compound is a compound that becomes a polymer capable of gelling the organic solvent by polymerization.

10. The method according to claim 9 , further comprising a step of polymerizing the polymerizable compound in the electrode mixture layer after the step (b).

11. The method according to claim 5 , wherein the step (b) is performed subsequently to the step (a).

Assignees

• Lg Energy Solution Ltd

Inventors

• Ogawa Hideyuki
• Nishimura Takuya
• SERA Yusuke
• Horikawa Masayo
• Orita Akihiro

Classifications

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/625

  Carbon or graphite · CPC title