US 11,940,368 B2
Method for pre-detecting defective porous polymer substrate for separator
Won-Sik Bae, Daejeon (KR); Joo-Sung Lee, Daejeon (KR); Ho-Sung Kang, Daejeon (KR); Yern-Seung Kim, Daejeon (KR); Se-Jung Park, Daejeon (KR); Je-Seob Park, Daejeon (KR); and Ji-Young Hwang, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 18/032,565
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Apr. 6, 2022, PCT No. PCT/KR2022/004989
§ 371(c)(1), (2) Date Apr. 18, 2023,
PCT Pub. No. WO2022/216063, PCT Pub. Date Oct. 13, 2022.
Claims priority of application No. 10-2021-0044855 (KR), filed on Apr. 6, 2021.
Prior Publication US 2023/0384200 A1, Nov. 30, 2023
Int. Cl. G01N 15/08 (2006.01); B07C 5/34 (2006.01); G06T 7/00 (2017.01); G06T 7/168 (2017.01); H01J 37/26 (2006.01)
CPC G01N 15/088 (2013.01) [B07C 5/3416 (2013.01); G06T 7/0004 (2013.01); G06T 7/168 (2017.01); H01J 37/26 (2013.01); G06T 2207/10061 (2013.01); G06T 2207/20021 (2013.01); G06T 2207/20048 (2013.01); G06T 2207/30108 (2013.01)] 7 Claims
OG exemplary drawing
 
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.