Electrode composite, secondary battery, battery pack and vehicle

Patent metadata

Field	Value
Publication number	US-10446841-B2
Application number	US-201715692760-A
Country	US
Kind code	B2
Filing date	Aug 31, 2017
Priority date	Mar 23, 2017
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

According to one embodiment, an electrode composite is provided. The electrode composite includes a negative electrode active material-containing layer and an insulating particle layer. The negative electrode active material-containing layer includes negative electrode active material secondary particles having an average secondary particle size of from 1 μm to 30 μm. The insulating particle layer is provided on the negative electrode active material-containing layer. The insulating particle layer includes a first surface and a second surface opposed to the first surface. The first surface is in contact with the negative electrode active material-containing layer. The second surface has a surface roughness of 0.1 μm or less.

First claim

What is claimed is:

1. An electrode composite comprising:
a negative electrode active material-containing layer comprising negative electrode active material secondary particles having an average secondary particle size of from 1 μm to 30 μm; and
an insulating particle layer provided on the negative electrode active material-containing layer and comprising inorganic compound particles,
wherein the insulating particle layer comprises a first surface and a second surface opposed to the first surface, the first surface is in contact with the negative electrode active material-containing layer, and the second surface has a surface roughness of 0.1 μm or less.

2. The electrode composite according to claim 1 , wherein a thickness of the insulating particle layer is from 10 μm to 40 μm.

3. The electrode composite according to claim 1 , wherein the inorganic compound particles comprise lithium ion-conductive particles.

4. The electrode composite according to claim 1 , wherein the negative electrode active material secondary particles comprise titanium-containing oxide particles.

5. The electrode composite according to claim 4 , wherein the titanium-containing oxide particles comprise at least one kind of particles selected from the group consisting of particles of a lithium titanate having a spinel-type crystal structure, particles of a lithium titanate having a ramsdellite-type crystal structure, particles of a titanium-niobium composite oxide, particles of a titanium dioxide having a monoclinic crystal structure, and particles of a titanium dioxide having an anatase-type crystal structure.

6. The electrode composite according to claim 1 , further comprising:
a current collector comprising a third surface and a fourth surface opposed to the third surface, the negative electrode active material-containing layer being provided on the third surface; and
a positive electrode active material-containing layer provided on the fourth surface.

7. A secondary battery comprising:
the electrode composite according to claim 1 ; and
a positive electrode comprising a positive electrode active material-containing layer,
wherein the second surface of the insulating particle layer is in contact with the positive electrode active material-containing layer.

8. A secondary battery comprising a first electrode composite and a second electrode composite located next to the first electrode composite, the first and the second electrode composites being composite electrodes each according to claim 6 ,
wherein the second surface of the insulating particle layer of the first electrode composite is in contact with the positive electrode active material-containing layer of the second electrode composite.

9. The secondary battery according to claim 7 , further comprising a gel nonaqueous electrolyte held in the insulating particle layer.

10. A battery pack comprising the secondary battery according to claim 7 .

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

12. The battery pack according to claim 10 , comprising a plural of secondary batteries, the plural of the secondary batteries being electrically connected in series, in parallel, or in combination of in series and in parallel.

13. A vehicle comprising the battery pack according to claim 10 .

14. The vehicle according to claim 13 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Yasuda Kazuhiro
• Sugizaki Tomoko
• Yoshima Kazuomi
• Iwasaki Takuya
• Harada Yasuhiro
• Takami Norio

Classifications

• H01M4/385

  of the type LaNi5 · CPC title

• B60L50/30

  using propulsion power stored mechanically, e.g. in fly-wheels · CPC title

• B60L50/66

  Arrangements of batteries · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M10/625

  Vehicles · CPC title