US 12,294,112 B2
Organic/inorganic composite porous film and electrochemical device prepared thereby
Hyun Hang Yong, Seoul (KR); Sang Young Lee, Daejeon (KR); Seok Koo Kim, Daejeon (KR); Soon Ho Ahn, Daejeon (KR); and Jung Don Suk, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR); and TORAY INDUSTRIES, INC., Tokyo (JP)
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR); and TORAY INDUSTRIES, INC., Tokyo (JP)
Filed on Jun. 25, 2021, as Appl. No. 17/358,433.
Application 17/358,433 is a continuation of application No. 16/374,483, filed on Apr. 3, 2019, abandoned.
Application 16/374,483 is a continuation of application No. 15/890,229, filed on Feb. 6, 2018, abandoned.
Application 15/890,229 is a continuation of application No. 15/266,838, filed on Sep. 15, 2016, abandoned.
Application 15/266,838 is a continuation of application No. 13/785,260, filed on Mar. 5, 2013, granted, now 9,490,463, issued on Nov. 8, 2016.
Application 13/785,260 is a continuation of application No. 11/217,918, filed on Sep. 1, 2005, granted, now 8,409,746, issued on Apr. 2, 2013.
Claims priority of application No. 10-2004-70095 (KR), filed on Sep. 2, 2004; application No. 10-2004-70096 (KR), filed on Sep. 2, 2004; and application No. 10-2005-9999 (KR), filed on Feb. 3, 2005.
Prior Publication US 2021/0320380 A1, Oct. 14, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 50/446 (2021.01); H01M 10/0525 (2010.01); H01M 10/42 (2006.01); H01M 50/403 (2021.01); H01M 50/451 (2021.01); H01M 50/463 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01); H01M 50/497 (2021.01)
CPC H01M 50/446 (2021.01) [H01M 10/0525 (2013.01); H01M 10/4235 (2013.01); H01M 50/403 (2021.01); H01M 50/451 (2021.01); H01M 50/463 (2021.01); H01M 50/489 (2021.01); H01M 50/491 (2021.01); H01M 50/497 (2021.01); Y02E 60/10 (2013.01); Y02P 70/50 (2015.11); Y02T 10/70 (2013.01); Y10T 428/2998 (2015.01)] 15 Claims
OG exemplary drawing
 
1. A lithium secondary battery comprising:
a cathode;
an anode;
an electrolyte; and
a separator comprising:
a porous substrate, which is not a cathode and/or an anode, and an organic/inorganic composite porous film coated directly on a surface of the porous substrate, the organic/inorganic composite porous film consisting of:
a binder polymer disposed on inorganic particles and interconnecting the inorganic particles to each other; and
interstitial volumes defined by the interconnected inorganic particles,
wherein said interstitial volumes defined by the interconnected inorganic particles directly form a uniform pore structure 3-dimensionally throughout the organic/inorganic composite porous film,
wherein the inorganic particles have a dielectric constant of 5 or more,
wherein the inorganic particles are at least one selected from the group consisting of BaTiO3, Pb(Zr,Ti)O3 (PZT), Pb1-xLaxZr1-yTiyO3 (PLZT), Pb(Mg1/3Nb2/3)O3—PbTiO3 (PMN-PT), hafnia (HfO2), SrTiO3, SnO2, CeO2, NiO, ZnO, and Y2O3,
wherein the binder polymer consists of one or more selected from the group consisting of polyvinylidene fluoride-co-trichloroethylene, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethyl polyvinylalcohol, cyanoethylcellulose, and cyanoethylsucrose pullulan,
wherein the organic/inorganic composite porous film is obtained by coating a mixture of the inorganic particles and the binder polymer on the surface of the porous substrate, and
wherein the organic/inorganic composite porous film is not formed by coating the mixture of the inorganic particles and the binder polymer on a surface of a cathode or an anode.