Wound electrode group, electrode group, and nonaqueous electrolyte battery

Patent metadata

Field	Value
Publication number	US-10505233-B2
Application number	US-201715453154-A
Country	US
Kind code	B2
Filing date	Mar 8, 2017
Priority date	Sep 10, 2014
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

According to an embodiment, an electrode is provided. The electrode group includes a stack. The stack includes a positive electrode, a negative electrode or negative electrodes, and separator. Each negative electrode includes a negative electrode current collector and a negative electrode layer provided on the negative electrode current collector. The electrode group satisfies following relational formulae (I) to (III): 10≤a 1 /b 1 ≤16 (I); 0.7≤D 1 /E 1 ≤1.4 (II); E 1 ≤85 (III). Here, the a 1 [mm] is a thickness of the stack. The b 1 [mm] is a thickness of the negative electrode current collector, or is a total thickness of the negative electrode current collectors. The D 1 [μm] is a thickness of the positive electrode. The E 1 [μm] is a thickness of the negative electrode.

First claim

What is claimed is:

1. A nonaqueous electrolyte battery comprising an electrode group comprising a stack comprising:
a positive electrode;
a negative electrode or negative electrodes, each comprising a negative electrode current collector and a negative electrode layer provided on the negative electrode current collector, wherein the negative electrode layer comprises a lithium titanium composite oxide; and
a separator,
wherein the electrode group satisfies the following relational formulae (I) to (III):
10≤ a 1 /b 1 ≤16  (I);

0.7≤ D 1 /E 1 ≤1.4  (II); and

E 1 ≤85  (III),

wherein a 1 is a thickness of the stack; b 1 is a thickness of the negative electrode current collector when the stack comprises the negative electrode, or is a total thickness of the negative electrode current collectors when the stack comprises the negative electrodes; D 1 is a thickness of the positive electrode; and E 1 is a thickness of the negative electrode, wherein a unit of a 1 is mm, a unit of b 1 is mm, a unit of D 1 is μm, and a unit of E 1 is μm;
a nonaqueous electrolyte; and
a metal container housing the electrode group and the nonaqueous electrolyte.

2. The nonaqueous electrolyte battery according to claim 1 , wherein the negative electrode current collector comprises aluminum or an aluminum alloy.

3. The nonaqueous electrolyte battery according to claim 1 , wherein the separator is a non-woven fabric.

4. The nonaqueous electrolyte battery according to claim 1 , wherein a ratio a 1 /b 1 is from 10 to 14.

5. The nonaqueous electrolyte battery according to claim 1 , wherein a ratio D 1 /E 1 is from 0.9 to 1.3.

6. The nonaqueous electrolyte battery according to claim 1 , wherein the stack comprises:
positive electrodes each of which is the positive electrode;
the negative electrodes;
separators each of which is the separator;
wherein each of the positive electrodes comprises a positive electrode current collector and a positive electrode layer provided on the positive electrode current collector; and
wherein the thickness a 1 of the stack is a sum of a total thickness of the positive electrode current collectors; a total thickness of the positive electrode layers; a total thickness of the negative electrode current collectors; a total thickness of the negative electrode layers; and a total thickness of the separators.

7. A nonaqueous electrolyte battery comprising:
a wound electrode group comprising a flat part comprising:
a positive electrode;
a negative electrode comprising a negative electrode current collector and a negative electrode layer provided on the negative electrode current collector, wherein the negative electrode layer comprises a lithium titanium composite oxide; and
a separator
wherein the wound electrode group satisfies the following relational formulae of (1) to (3):
10≤ a/b≤ 16  (1);

0.7≤ D/E≤ 1.4  (2); and

E≤ 85  (3),

wherein a is a thickness of the flat part; b is a total thickness of the negative electrode current collector in the flat part; D is a thickness of the positive electrode; and E is a thickness of the negative electrode, wherein a unit of a is mm, a unit of b is mm, a unit of D is μm, and a unit of E is μm;
a nonaqueous electrolyte; and
a metal container housing the electrode group and the nonaqueous electrolyte.

8. The nonaqueous electrolyte battery according to claim 7 , wherein the negative electrode current collector comprises aluminum or an aluminum alloy.

9. The nonaqueous electrolyte battery according to claim 7 , wherein the separator is a non-woven fabric.

10. The nonaqueous electrolyte battery according to claim 7 , wherein a ratio a/b is from 10 to 14.

11. The nonaqueous electrolyte battery according to claim 7 , wherein a ratio D/E is from 0.9 to 1.3.

12. The nonaqueous electrolyte battery according to claim 7 , wherein a ratio D/E is from 0.7 to 0.81.

13. The nonaqueous electrolyte battery according to claim 7 ,
wherein the flat part comprises layers of the positive electrode, layers of the negative electrode, and layers of the separator; and
wherein the thickness a of the flat part is a sum of a total thickness of the layers of the positive electrode; a total thickness of the layers of the negative electrode; and a total thickness of the layers of the separator.

Assignees

• Toshiba Kk

Inventors

• Murashi Yasuaki
• Negishi Nobuyasu
• Shinoda Tatsuya
• Takeshita Koichi
• Kawamura Koichi
• Hashimoto Tatsuya

Classifications

• H01M10/0525

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

• H01M4/662

  Alloys (collectors of lead alloys H01M4/685) · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0587 Primary

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title