Electrode, nonaqueous electrolyte battery, and battery pack

• US 9,413,008 B2
• Filed: 12/27/2012
• Issued: 08/09/2016
• Est. Priority Date: 03/26/2012
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Iwasaki, Takuya, Inagaki, Hiroki, Takami, Norio
• Primary Examiner(s): Fraser, Stewart
• Assistant Examiner(s): GODO, OLATUNJI A
• Application Number:
  US13/727,946
• Publication Number:
  US 20130252077A1
• Time in Patent Office: 1,321 Days
• Field of Search: 429/163
• US Class Current: 1/1
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/483 for non-aqueous cells H01M4/485 takes precedence
• CPC Class Codes: H01M 4/602 Polymers
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

According to one embodiment, there is provided an electrode. The electrode includes a current collector and an active material layer provided on the current collector. The active material layer contains an active material and an acrylic based polymer.

Claims

1. A negative electrode comprising a current collector, said current collector having only one negative electrode active material layer provided on each surface thereof,

wherein the negative electrode active material layer comprises a negative electrode active material, an acrylic based polymer, and a polyvinylidene fluoride,

wherein the negative electrode active material consists of at least one selected from the group consisting of lithium titanate having a spinel structure and a monoclinic 3-type titanium complex oxide,

wherein the active material is coated with the acrylic based polymer and the polyvinylidene fluoride,

wherein all solid acid points of the active material are coated with the acrylic based polymer, and

wherein a ratio of a total mass of the acrylic based polymer to the sum of the total mass of the acrylic based polymer and a mass of the polyvinylidene fluoride is in a range from 60% by mass to 70% by mass.

2. The negative electrode according to claim 1, wherein the negative electrode active material consists of said lithium titanate having a spinel structure.

3. The negative electrode according to claim 1, wherein the negative electrode active material consists of said monoclinic β

-type titanium complex oxide.

4. The negative electrode according to claim 1, wherein the negative electrode active material consists of said lithium titanate having a spinel structure and said monoclinic β

-type titanium complex oxide.

5. A nonaqueous electrolyte battery comprising:

a positive electrode;

the negative electrode according to claim 1; and

a nonaqueous electrolyte.

6. A nonaqueous electrolyte battery comprising:

a positive electrode;

the negative electrode according to claim 2; and

a nonaqueous electrolyte.

7. A nonaqueous electrolyte battery comprising:

a positive electrode;

the negative electrode according to claim 3; and

a nonaqueous electrolyte.

8. A nonaqueous electrolyte battery comprising:

a positive electrode;

the negative electrode according to claim 4; and

a nonaqueous electrolyte.

9. A battery pack comprising:

aqueous electrolyte battery according to claim 5; and

a container accommodating the battery.

10. A battery pack comprising:

the nonaqueous electrolyte battery according to claim 6; and

a container accommodating the battery.

11. A battery pack comprising:

the nonaqueous electrolyte battery according to claim 7; and

a container accommodating the battery.

12. A battery pack comprising:

the nonaqueous electrolyte battery according to claim 8; and

a container accommodating the battery.