IP Library › Granted Patent US 9,567,238
Granted Patent B2
US 9,567,238 · App. 14/693,200 · Granted Feb 14, 2017

Negative electrode active material for lithium ion secondary battery, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

Inventors: Yasuyuki Kawanaka (Tokyo, JP); Tomohiko Kato (Tokyo, JP); Atsushi Sano (Tokyo, JP)
Assignee: TDK CORPORATION
C01G49/06H01M2/16H01M4/0404H01M4/0471H01M4/131H01M4/1391H01M4/525C01P2004/04C01P2004/45C01P2006/40H01M4/622H01M4/625H01M10/052H01M10/0525H01M10/0568H01M10/0569H01M2004/021H01M2004/027Y02E60/122
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Quick Facts
Patent No.
US 9,567,238
App. No.
14/693,200
Granted
Feb 14, 2017
Kind
B2
Abstract

A negative electrode active material for a lithium ion secondary battery includes secondary particles formed by primary particles containing iron oxide that are linked in a chain.

Claims (13)

1. A negative electrode active material for a lithium ion secondary battery, comprising secondary particles formed by primary particles containing iron oxide that are linked in a chain.

2. The negative electrode active material for a lithium ion secondary battery according to claim 1 , wherein the primary particles have a diameter of not more than three times a crystallite diameter of the iron oxide.

3. The negative electrode active material for a lithium ion secondary battery according to claim 2 , wherein the secondary particles extending in a chain have a short axis direction diameter of not more than twice the diameter of the primary particles.

4. The negative electrode active material for a lithium ion secondary battery according to claim 3 , wherein the secondary particle are radially aggregated.

5. The negative electrode active material for a lithium ion secondary battery according to claim 2 , wherein the secondary particles are radially aggregated.

6. The negative electrode active material for a lithium ion secondary battery according to claim 1 , wherein the secondary particles extending in a chain have a short axis direction diameter of not more than twice a diameter of the primary particles.

7. The negative electrode active material for a lithium ion secondary battery according to claim 6 , wherein the secondary particles are radially aggregated.

8. The negative electrode active material for a lithium ion secondary battery according to claim 1 , wherein the secondary particles are radially aggregated.

9. A negative electrode for a lithium ion secondary battery, comprising the negative electrode active material according to claim 1 .

10. A lithium ion secondary battery comprising:

the negative electrode according to claim 9 ;

a positive electrode; and

a nonaqueous electrolyte.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 22, 2015
From: KAWANAKA, YASUYUKI; KATO, TOMOHIKO; SANO, ATSUSHI
To: TDK CORPORATION
Reel/Frame 035470/0770 →
Priority Claims (2)
JP 2014-091689 · Apr 25, 2014 · national
JP 2015-034953 · Feb 25, 2015 · national
Continuity (1)
Related Publication 20150311519A1 · Oct 29, 2015