US 12,283,714 B2
Separator structure, method for producing the same, and secondary battery using the same
Dongwook Lee, Seoul (KR); Munhyuk Lim, Seoul (KR); Hongjung Kim, Seoul (KR); Kyungho Jung, Seoul (KR); Juchul Lee, Seoul (KR); Junhan Kwon, Seoul (KR); Keeyong Kim, Seoul (KR); Sumin Lee, Seoul (KR); Yongkeon Ahn, Seoul (KR); and Youngmin Pi, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Jan. 4, 2022, as Appl. No. 17/646,925.
Claims priority of application No. 10-2021-0034807 (KR), filed on Mar. 17, 2021; and application No. 10-2021-0065649 (KR), filed on May 21, 2021.
Prior Publication US 2022/0302555 A1, Sep. 22, 2022
Int. Cl. H01M 50/429 (2021.01); H01M 50/403 (2021.01); H01M 50/44 (2021.01); H01M 50/446 (2021.01)
CPC H01M 50/4295 (2021.01) [H01M 50/403 (2021.01); H01M 50/44 (2021.01); H01M 50/446 (2021.01)] 13 Claims
OG exemplary drawing
 
1. A separator structure including a support disposed inside a secondary battery, wherein the support comprises:
a surface-treated porous polymer matrix with a surface treatment agent, wherein the surface-treatment agent includes at least one of maleic acid or polydopamine;
at least partially hydrophobized cellulose nano fibers with a surface modifier,
wherein the surface modifier includes at least one of maleic acid, polydopamine, carboxyl, acetate, phosphoric acid, sulfuric acid, amine, silane, succinic acid, or an alkyl compound; and
surface-treated inorganic additives with a surface-treatment agent, wherein the surface-treatment agent comprises at least one of maleic acid or polydopamine,
wherein the cellulose nano fibers and the inorganic additives are dispersed in the matrix, and
wherein at least some of the inorganic additives dispersed in the matrix are attached to a respective fiber, among the cellulose nano fibers, and
wherein the cellulose nano fibers have a diameter of 100 nm or smaller.