Electrode for lithium ion secondary batteries and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-2021111398-A1
Application number	US-202017070935-A
Country	US
Kind code	A1
Filing date	Oct 15, 2020
Priority date	Oct 15, 2019
Publication date	Apr 15, 2021
Grant date	—

Abstract

To provide an electrode for lithium ion secondary batteries, and a lithium ion secondary battery made using this electrode for lithium ion secondary batteries, which can suppress an increase in electron resistance of a current collector area, and improve heat dissipation, in an electrode for lithium ion secondary batteries establishing a foam metal body as the collector.
In the electrode for lithium ion secondary batteries made using a foam porous body consisting of metal as a current collector, the electrode shape is rectangular, and a current collector region is made to span at least two adjacent sides.

First claim

What is claimed is:

1 . An electrode for lithium ion secondary batteries, the electrode comprising:
a current collector; and an electrode mixture containing electrode active material, wherein the current collector is a foam porous body consisting of metal, wherein the electrode mixture is filled into pores of the foam porous body, and wherein the electrode for lithium ion secondary batteries is rectangular, and a region spanning at least two adjacent sides is defined as a current collector region.

2 . The electrode for lithium ion secondary batteries according to claim 1 , wherein a current collector tab is connected to the current collector region.

3 . The electrode for lithium ion secondary batteries according to claim 1 , wherein a metal foil is laminated on the foam porous body in the current collector region.

4 . The electrode for lithium ion secondary batteries according to claim 1 , wherein thickness of the electrode for lithium ion secondary batteries is at least 250 μm.

5 . The electrode for lithium ion secondary batteries according to claim 1 , wherein the foam porous body is foam aluminum.

6 . The electrode for lithium ion secondary batteries according to claim 5 , wherein the electrode for lithium ion secondary batteries is a positive electrode.

7 . The electrode for lithium ion secondary batteries according to claim 5 , wherein density of the electrode mixture is in the range of 2.5 to 3.8 g/cm 3 .

8 . The electrode for lithium ion secondary batteries according to claim 5 , wherein average particle size of the electrode active material is no more than 10 μm.

9 . The electrode for lithium ion secondary batteries according to claim 1 , wherein the foam porous body is foam copper.

10 . The electrode for lithium ion secondary batteries according to claim 9 , wherein the electrode for lithium ion secondary batteries is a negative electrode.

11 . The electrode for lithium ion secondary batteries according to claim 9 , wherein density of the electrode mixture is in the range of 0.9 to 1.8 g/cm 3 .

12 . The electrode for lithium ion secondary batteries according to claim 9 , wherein average particle size of the electrode active material is no more than 20 μm.

13 . A lithium ion secondary battery comprising an electrode laminate in which a plurality of unit laminated bodies having a positive electrode and a negative electrode laminated via a separator or solid-state electrolyte layer is laminated,
wherein, in the unit laminated body at a central part of the electrode laminate, at least one of the positive electrode and the negative electrode is the electrode for lithium ion secondary batteries according to claim 1 .

14 . The lithium ion secondary battery according to claim 13 , wherein thickness of the electrode for lithium ion secondary batteries is at least three times the thickness of another electrode constituting the electrode laminate.

15 . The electrode for lithium ion secondary batteries according to claim 2 , wherein a metal foil is laminated on the foam porous body in the current collector region.

16 . The electrode for lithium ion secondary batteries according to claim 2 , wherein thickness of the electrode for lithium ion secondary batteries is at least 250 μm.

17 . The electrode for lithium ion secondery batteries according to claim 3 , wherein thickness of the electrode for lithium ion secondary batteries is at least 250 μm.

18 . The electrode for lithium ion secondary batteries according to claim 2 , wherein the foam porous body is foam aluminum.

19 . The electrode for lithium ion secondary batteries according to claim 3 , wherein the foam porous body is foam aluminum.

20 . The electrode for lithium ion secondary batteries according to claim 4 , wherein the foam porous body is foam aluminum.

Assignees

• Honda Motor Co Ltd
• Sumitomo Electric Industries

Inventors

• Tanaami Kiyoshi
• Isogai Yuji
• Aoyagi Shintaro
• Sakai Hideki
• Okuno Kazuki
• Hosoe Akihisa
• Senoo Kikuo
• Takebayashi Hiroshi

Classifications

• H01M10/0525 Primary

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

• H01M2004/021

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

• H01M4/0416

  involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence) · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M4/0402

  Methods of deposition of the material · CPC title