POSITIVE ELECTRODE ACTIVE MATERIAL FOR NON-AQUEOUS ELECTROLYTE SECONDARY CELL

Title:

POSITIVE ELECTRODE ACTIVE MATERIAL FOR NON-AQUEOUS ELECTROLYTE SECONDARY CELL

Document Type and Number:

WIPO Patent Application WO/2005/096415

Kind Code:

A1

Abstract:

A positive electrode active material for a non-aqueous electrode secondary cell which comprises a composite oxide containing iron and sodium as main components, having a hexagonal crystal structure, and exhibiting a value obtained by dividing the intensity of a peak corresponding to an interplanar spacing of 2.20 Å by the intensity of a peak corresponding to an interplanar spacing of 5.36 Å of 2 or less in the X-ray diffraction analysis of said composite oxide; and a method for preparing the positive electrode active material wherein the above composite oxide is prepared by heating a metal compound mixture mainly containing a sodium compound and an iron compound in the temperature range of 400 to 900°C, which comprises heating the metal compound mixture in an inert atmosphere in the temperature range of less than 100°C on the way of the rise in the temperature. The use of the above active material allows the manufacture of a cell which is free from the rapid reduction of the discharge voltage with the progress of discharge.

Inventors:

YAMAKI JUN-ICHI (JP)
OKADA SHIGETO (JP)
KIYABU TOSHIYASU (JP)
NAKANE KENJI (JP)

Application Number:

PCT/JP2005/006117

Publication Date:

October 13, 2005

Filing Date:

March 30, 2005

Export Citation:

Click for automatic bibliography generation Help

Assignee:

YAMAKI JUN-ICHI (JP)
OKADA SHIGETO (JP)
SUMITOMO CHEMICAL CO (JP)
KIYABU TOSHIYASU (JP)
NAKANE KENJI (JP)

International Classes:

C01G49/00; H01M4/52; H01M10/054; H01M10/36; H01M4/02; H01M4/525; (IPC1-7): H01M4/58; H01M4/02; H01M10/40

Foreign References:

JPH0855624A	1996-02-27
JPH1140156A	1999-02-12
JP2001283852A	2001-10-12
JP2000133249A	2000-05-12

Other References: