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1. (WO2017195979) METHOD FOR EVALUATING SECONDARY BATTERY ACTIVE MATERIAL

Pub. No.:    WO/2017/195979    International Application No.:    PCT/KR2017/003260
Publication Date: Fri Nov 17 00:59:59 CET 2017 International Filing Date: Tue Mar 28 01:59:59 CEST 2017
IPC: G01J 3/44
H01M 4/36
H01M 4/587
G01J 3/42
Applicants: SK INNOVATION CO., LTD.
에스케이이노베이션 주식회사
Inventors: LEE, Suk-Chin
이석진
KIM, Hyo-Sang
김효상
YUN, Jung-Hyun
윤정현
Title: METHOD FOR EVALUATING SECONDARY BATTERY ACTIVE MATERIAL
Abstract:
Provided is a method for evaluating a secondary battery active material, comprising: preparing an active material including a core and a shell located on the surface of the core; forming an active material layer including the active material on at least one surface of a current collector; acquiring a Raman spectrum for the active material and calculating a Raman R value (ID/IG) therefrom; obtaining a frequency distribution chart for the Raman R value; obtaining a probability density function by normalizing the frequency distribution chart; and evaluating the shell of the active material by extracting a Raman R value (ID/IG) and/or a predetermined width indicating a maximum value from the graph of the probability density function.