Title:
METHOD FOR DIAGNOSING CAUSE OF DEGRADATION OF LITHIUM SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2021/241899
Kind Code:
A1
Abstract:
The present invention relates to a non-destructive diagnostic method capable of diagnosing the degradation of a lithium secondary battery without disassembling the battery, and provides a method for diagnosing the cause of degradation of a lithium secondary battery, comprising the steps of: (A) preparing a lithium secondary battery including an anode and a cathode, which includes a layered cathode active material; (B) obtaining, from X-ray diffraction data obtained by measuring the lithium secondary battery during primary charging of same, a first graph indicating the c-axis d-spacing value of the layered cathode active material with respect to the number of moles of lithium ions desorbed during charging from the layered cathode active material; (C) obtaining, from X-ray diffraction data obtained by measuring the lithium secondary battery during secondary charging, a second graph indicating the c-axis d-spacing value of the layered cathode active material with respect to the number of moles of lithium ions desorbed during charging from the layered cathode active material; and (D) classifying the cause of the degradation of the lithium secondary battery by comparing the first graph to the second battery.
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Inventors:
YOON HYO JUNG (KR)
LEE EUN JU (KR)
KIM SO YOUNG (KR)
LEE EUN JU (KR)
KIM SO YOUNG (KR)
Application Number:
PCT/KR2021/005365
Publication Date:
December 02, 2021
Filing Date:
April 28, 2021
Export Citation:
Assignee:
LG ENERGY SOLUTION LTD (KR)
International Classes:
G01N23/2055; G01N27/403; H01M10/052; H01M10/42
Foreign References:
| KR20110016378A | 2011-02-17 | |||
| JP2017139089A | 2017-08-10 | |||
| JP2013131338A | 2013-07-04 | |||
| JP2004349211A | 2004-12-09 | |||
| KR20160048585A | 2016-05-04 |
Other References:
See also references of EP 4009041A4
Attorney, Agent or Firm:
BAE, KIM & LEE IP (KR)
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