Title:
SINGLE CRYSTAL OF SODIUM COBALT OXIDE AND ITS MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP3867136
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a new single crystal of sodium cobaltate having thermoelectric conversion capability and useful for a thermoelectric conversion material and a material of a lithium ion secondary battery material and the like and to provide its manufacturing method.
SOLUTION: When Co3O4 powder, Na2CO3 powder and NaCl powder are mixed, the resultant mixture is heated at high temperatures of about 800 to 1,200°C and then gradually cooled to manufacture the crystal of sodium cobaltate, the single crystal whose molar ratio of sodium to cobalt shown by chemical formula NaCoO2 is strictly 1:1 is obtained by mixing raw materials with the ratio by weight of 3 to 10 parts of Na2CO3 and 5 to 10 parts of NaCl to 1 part of Co3O4.
Inventors:
Junji Akimoto
Yasuhiko Takahashi
Yasuhiko Takahashi
Application Number:
JP2002192522A
Publication Date:
January 10, 2007
Filing Date:
July 01, 2002
Export Citation:
Assignee:
National Institute of Advanced Industrial Science and Technology
International Classes:
C01G51/00; C30B29/22; H01L35/22; H01L35/34; H01M4/525; (IPC1-7): C30B29/22; C01G51/00; H01L35/22; H01L35/34; H01M4/58
Domestic Patent References:
| JP2002223011A | ||||
| JP7320783A | ||||
| JP2003206138A | ||||
| JP2002274943A |
Other References:
M. Jansen, et al.,Neue Oxocobaltate,Naturwissenschaften,1972年,Vol. 59, No. 5,p. 215,ISSN:0028-1042