Electrode material, nonaqueous electrolyte battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2016380267-A1
Application number	US-201615259234-A
Country	US
Kind code	A1
Filing date	Sep 8, 2016
Priority date	Mar 19, 2014
Publication date	Dec 29, 2016
Grant date	—

Abstract

According to one embodiment, an electrode material is provided. The electrode material includes active material particles. The active material particle includes a phase of a monoclinic titanium dioxide and a phase of the spinel type lithium titanate. The active material particle includes a shell part and a core part surrounded by the shell part. The shell part is formed by dispersing at least a part of the phase of the spinel type lithium titanate on the active material particle. The core part includes a part of the phase of the monoclinic titanium dioxide.

First claim

What is claimed is:

1 . An electrode material comprising:
active material particles comprising a phase of monoclinic titanium dioxide; and a phase of spinel type lithium titanate; wherein the active material particle comprises a shell part formed by dispersing at least a part of the phase of the spinel type lithium titanate on a surface of the active material particle, and a core part which contains a part of the phase of the monoclinic titanium dioxide and is surrounded by the shell part.

2 . The electrode material according to claim 1 , wherein the shell part contains another part of the phase of the monoclinic titanium dioxide, solid acid points of the another part of the phase of the monoclinic titanium dioxide are neutralized by the phase of the spinel type lithium titanate.

3 . The electrode material according to claim 1 , wherein the shell part contains no monoclinic titanium dioxide.

4 . The electrode material according to claim 1 , which contains the shell part in a ratio of 1% by mass to 50% by mass relative to a mass of the electrode material.

5 . The electrode material according to claim 1 , wherein the active material particle further contains an intermediate part located between the core part and the shell part, and
the intermediate part contains another part of the phase of the monoclinic titanium dioxide and another part of the phase of the spinel type lithium titanate.

6 . The electrode material according to claim 5 , wherein an area in the intermediate part adjacent to the shell part has a concentration of the spinel type lithium titanate higher than a concentration of the spinel type lithium titanate of an area in the intermediate part adjacent to the core part.

7 . The electrode material according to claim 5 , a crystal lattice of the monoclinic titanium dioxide and a crystal lattice of the spinel type lithium titanate interpenetrate in the intermediate part.

8 . The electrode material according to claim 1 , wherein the active material particle is a primary particle or a secondary particle.

9 . A nonaqueous electrolyte battery comprising:
a negative electrode comprising the electrode material according to claim 1 ; a positive electrode; and a nonaqueous electrolyte.

10 . A battery pack comprising the nonaqueous electrolyte battery according to claim 9 .

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

12 . A battery pack comprising nonaqueous electrolyte batteries, each of the nonaqueous electrolyte batteries comprising:
a negative electrode comprising the electrode material according to claim 1 ; a positive electrode; and a nonaqueous electrolyte; wherein the nonaqueous electrolyte batteries are electrically connected in series, in parallel, or with a combination of series connection and parallel connection.

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

14 . The vehicle according to claim 13 , wherein the battery pack is configured to recover a regenerative energy caused by a power of the vehicle.

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Takami Norio
• Inagaki Hiroki

Classifications

• C01G23/047

  Titanium dioxide · CPC title

• H01M10/0525

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

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/483

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

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title