Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
NEGATIVE ELECTRODE BODY FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY USING NEGATIVE ELECTRODE BODY
Document Type and Number:
Japanese Patent JPH09190822
Kind Code:
A
Abstract:

To reduce the unreversible capacity of a negative electrode so as to improve the efficiency of the initial charging and discharging, and to improve the utilizing rate of the lithium in a positive electrode, by using a carbon type material processed by a reducer, to a negative electrode active material, in a lithium secondary battery.

In the negative electrode body for a lithium secondary battery, a material formed by processing a carbon type material by a reducer is used as a negative electrode active material. It is preferable to use a butyl lithium solution with the density 1 to 5mol/l using hexane as the solvent, as the reducer. The processing time is about 80 to 100 hours. When the particle diameter of the carbon type material exceeds 5μm, the surface area is reduced and the effect of the reducing processing is decreased, and the particle diameter is preferably less than 5μm. And it is favorable that the (002) surface interval d002 is less than 3.40. Furthermore, the size Lc of the crystallite in the C axial direction of the carbon type material is preferable to have the particle diameter less than 1000. As the positive electrode, lithium compound oxide is used.


Inventors:
Katagiri, Nobuo
Inoue, Tomohiro
Akiyama, Shoichi
Osawa, Toshiyuki
Application Number:
JP1996000018184
Publication Date:
July 22, 1997
Filing Date:
January 08, 1996
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
RICOH CO LTD
International Classes:
C01B31/02; H01M4/133; H01M4/1393; H01M4/587; H01M10/05; H01M10/0525; H01M10/0562; H01M10/0565; (IPC1-7): H01M4/58; C01B31/02; H01M4/02; H01M4/04; H01M10/40
Attorney, Agent or Firm:
友松 英爾 (外1名)