Patent ID: 11940368
Assignee: LG ENERGY SOLUTION, LTD.
Field: Measurement (Instruments)
Classification: CPC G  B  H  Y | IPC B  G  H

Claim 0:
1. A method for pre-detecting a defective porous polymer substrate for a separator, comprising:
preparing a porous polymer substrate having a plurality of pores;
observing the porous polymer substrate with a scanning electron microscope (SEM) to obtain an image of the porous polymer substrate;
quantifying an average value of pore distribution index (PDI) by using the image of the porous polymer substrate;
correcting the quantified average value of pore distribution index (PDI) to obtain a corrected average value of pore distribution index;
determining whether or not the corrected average value of pore distribution index (PDI) is 60 a.u. (arbitrary unit) or less; and
classifying the porous polymer substrate as a good product when the corrected average value of pore distribution index (PDI) is determined to be 60 a.u. or less, and classifying the porous polymer substrate as a defective product when the corrected average value of pore distribution index (PDI) is determined to be larger than 60 a.u.