Title:
【発明の名称】リチウムイオン二次電池、及び同二次電池用負極材料
Document Type and Number:
Japanese Patent JP2849561
Kind Code:
B2
Abstract:
PURPOSE: To provide a lithium ion secondary battery which has large energy density and electric capacity according to a theoretical value and has the long cycle service life by specifying a crystal lattice constant, a thickness, a maximum particle length and the ratio of volume resistivity of a graphite particulate. CONSTITUTION: In an material for a lithium ion secondary battery molded by a graphite particulate, a flaky graphite particulate on which a crystal lattice constant Co(002) of a graphite crystal 002 surface of the graphite particulate is 0.670 to 0.673nm and a thickness of the graphite particulate is not more than 1μm and a maximum particle length is not more than 100μm and a value of the ratio of volume resistivity in the molding pressure vertical direction and the molding pressure parallel direction when the graphite particle is molded in 500kg/cm<2> is 1×10<-6> to 1×10<-4> , is provided. Therefore, a lithium ion secondary battery which has large capacity and has high electric potential and is excellent in a charge-discharge cycle characteristic can be provided.
Inventors:
FUKUDA KENJI
UMENO TATSUO
HARA YOICHIRO
SAKATA KOJI
UMENO TATSUO
HARA YOICHIRO
SAKATA KOJI
Application Number:
JP6961695A
Publication Date:
January 20, 1999
Filing Date:
March 28, 1995
Export Citation:
Assignee:
MITSUI KOZAN KK
International Classes:
H01M10/05; C01B31/04; H01M4/587; (IPC1-7): H01M4/58; H01M4/02; H01M10/40
Domestic Patent References:
| JP8213020A | ||||
| JP6275271A |
Attorney, Agent or Firm:
Wakabayashi Tadashi