Title:
二次電池負極に適した黒鉛粉末とその製造方法及び用途
Document Type and Number:
Japanese Patent JP4701484
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a graphite powder suitable for a negative electrode material of lithium ion secondary battery, which has high charging capacity and high charge-discharge efficiency and also give an improved high-rate discharging characteristic. SOLUTION: A graphite powder produced through carbonization, crushing, and a graphitizing heat treatment is subjected to heat treatment for oxidation for shaving off the surface to expose the surface closed structure, and is subjected to another heat treatment with a rapid temperature rise in an inert gas so that a surface closed structure is formed again, and thereby graphite powder is established having a surface form in which closed regions with the end parts of graphite c-plane layers coupled together to generate closed structure are scattered on the powder surfaces in mosaic form where the length (Lc⊥) perpendicular to the graphite c-axis in each closed region is 100 nm or less.
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Inventors:
Wataru Sugimura
Shinji Soto
Ken Abe
Atsuo Komaru
Yusuke Fujishige
Masayuki Nagamine
Shinji Soto
Ken Abe
Atsuo Komaru
Yusuke Fujishige
Masayuki Nagamine
Application Number:
JP2000261046A
Publication Date:
June 15, 2011
Filing Date:
August 30, 2000
Export Citation:
Assignee:
中央電気工業株式会社
ソニー株式会社
ソニー株式会社
International Classes:
C01B31/04; H01M4/587; H01M10/05
Domestic Patent References:
| JP10125322A | ||||
| JP11307095A | ||||
| JP10218615A | ||||
| JP10226506A | ||||
| JP2000164219A |
Foreign References:
| WO1998029335A1 |
Attorney, Agent or Firm:
Shoichi Hirose