Electrode, secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-11515531-B2
Application number	US-202016802643-A
Country	US
Kind code	B2
Filing date	Feb 27, 2020
Priority date	Sep 13, 2019
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer. The active material-containing layer contains an active material and a flat plate-shaped silicate.

First claim

What is claimed is:

1. An electrode, comprising:
an active material-containing layer comprising an active material and a flat plate-shaped silicate,
wherein the active material-containing layer does not comprise a carboxymethyl cellulose,
wherein a thickness of the flat plate-shaped silicate is within a range from 0.2 nm to 100 nm,
wherein a length in a shorter direction of the flat plate-shaped silicate is within a range from 3 nm to 900 nm, and
wherein an aspect ratio of the length in the shorter direction of the flat plate-shaped silicate to the thickness of the flat plate-shaped silicate is within a range from 5 to 25.

2. The electrode according to claim 1 , wherein
the thickness of the flat plate-shaped silicate is within a range from 0.5 nm to 50 nm.

3. The electrode according to claim 1 , wherein
the length in a shorter direction of the flat plate-shaped silicate is within a range from 10 nm to 300 nm.

4. The electrode according to claim 1 , wherein
a ratio of a mass of the flat plate-shaped silicate to a mass of the active material is within a range from 0.01 to 0.1 in the active material-containing layer.

5. The electrode according to claim 1 , wherein
the active material comprises a monoclinic niobium titanium composite oxide.

6. The electrode according to claim 1 , wherein
the flat plate-shaped silicate is at least one kind selected from the group consisting of hectorite, saponite, and montmorillonite.

7. The electrode according to claim 1 , wherein
the active material-containing layer further comprises a dispersing agent, and
the dispersing agent is a water-soluble material having anionicity or cationicity.

8. A secondary battery comprising:
a positive electrode;
a negative electrode; and
an electrolyte, wherein
the negative electrode is the electrode according to claim 1 .

9. A battery pack comprising
the secondary battery according to claim 8 .

10. The battery pack according to claim 9 , further comprising:
an external power distribution terminal; and
a protective circuit.

11. The battery pack according to claim 9 , comprising
a plurality of the secondary batteries, wherein
the plurality of the secondary batteries are electrically connected in series, in parallel, or in a combination of series connection and parallel connection.

12. A vehicle comprising the battery pack according to claim 9 .

13. The vehicle according to claim 12 , further comprising a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

14. The electrode according to claim 1 , wherein
the active material-containing layer comprises the active material, a conductive agent, a binder, and a thickening agent at ratios in a range from 70% by mass to 96% by mass or less, in a range from 2% by mass to 28% by mass, in a range from 2% by mass to 28% by mass, and in a range from 2% by mass to 28% by mass, respectively, and
the thickening agent consists of the flat plate-shaped silicate.

15. The electrode according to claim 1 , wherein the flat plate-shaped silicate is a thickening agent.

16. The electrode according to claim 1 , wherein a thickening agent is present in the active material-containing layer in a range of from 1 to 5 parts by mass.

Assignees

• Toshiba Kk

Inventors

• Yamashita Yasunobu
• Hoshina Keigo
• Harada Yasuhiro
• Takami Norio

Classifications

• H01M2004/021

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

• H01M4/66 Primary

  Selection of materials · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/483 Primary

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title