Title:
リチウムマンガンスピネル型結晶相の定量方法
Document Type and Number:
Japanese Patent JP6846734
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for easily and accurately quantifying a lithium manganese spinel type crystal phase existing in a cathode active material containing a lithium manganese based complex oxide after a charge/discharge cycle test.SOLUTION: The present invention relates to a method including at least one of steps of: measuring a range of 2θ=61 to 66° in an X-ray diffractometer using CuKα rays for a cathode active material after a charge/discharge cycle test, performing profile fitting upon an obtained X-ray diffraction pattern with three peaks, and calculating an area ratio of two higher-angle peaks and one lower-angle peak; and measuring aFe Moessbauer spectral spectrum for the cathode active material after the charge/discharge cycle test, performing profile fitting upon an obtained paramagnetic tablet peak with a symmetric tablet of two components, and calculating an area ratio of a trivalent iron ion component at a position where four oxygen atoms are coordinated, and a trivalent iron ion component at a position where six oxygen atoms are coordinated.SELECTED DRAWING: None
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Inventors:
Mitsuharu Tabuchi
Toshikatsu Kojima
Toshikatsu Kojima
Application Number:
JP2016229664A
Publication Date:
March 24, 2021
Filing Date:
November 28, 2016
Export Citation:
Assignee:
National Institute of Advanced Industrial Science and Technology
International Classes:
H01M4/505; C01G45/00; C01G53/00; G01N23/2055; G01N23/207
Domestic Patent References:
| JP2003331844A | ||||
| JP2016175825A | ||||
| JP2013179044A | ||||
| JP2002068748A | ||||
| JP2014178203A | ||||
| JP2010022365A |
Foreign References:
| WO2016129557A1 |
Attorney, Agent or Firm:
Patent Business Corporation Saegusa International Patent Office