US2011281172A1PendingUtilityA1

Organic/inorganic composite porous film and electrochemical device prepared thereby

Assignee: YONG HYUN HANGPriority: Feb 9, 2004Filed: Jul 15, 2011Published: Nov 17, 2011

Est. expiryFeb 9, 2024(expired)· nominal 20-yr term from priority

Inventors:Hyun Hang Yong Sang-Young Lee Seok Koo Kim Soon-Ho Ahn Jung Don Suk

H01M 50/497H01M 50/451H01M 50/491H01M 50/489H01M 50/403H01M 50/463H01M 50/446H01M 10/0525Y02E60/10Y02P70/50Y02T10/70Y10T428/2998H01M 10/4235

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References

Claims

Abstract

Disclosed is an organic/inorganic composite porous film comprising: (a) inorganic particles; and (b) a binder polymer coating layer formed partially or totally on surfaces of the inorganic particles, wherein the inorganic particles are interconnected among themselves and are fixed by the binder polymer, and interstitial volumes among the inorganic particles form a micropore structure. A method for manufacturing the same film and an electrochemical device including the same film are also disclosed. An electrochemical device comprising the organic/inorganic composite porous film shows improved safety and quality.

Claims

exact text as granted — not AI-modified

1 . An electrochemical device comprising:
 a cathode;   an anode; and   a gel type organic/inorganic composite porous film between the cathode and the anode, the gel type organic/inorganic composite porous film comprising
 inorganic particles, 
 a gel comprising a product of a binder polymer and an electrolyte, wherein the gel is disposed on the inorganic particles and connects the inorganic particles to each other, and 
 interstitial volumes defined substantially by the interconnected inorganic particles. 
   
     
     
         2 . The device of  claim 1 , wherein the interstitial volumes have a curved shape defined by the shape of the interconnected inorganic particles. 
     
     
         3 . The device of  claim 1 , wherein
 the binder polymer is interposed between adjacent inorganic particles of the interconnected inorganic particles, and   the interstitial volumes are defined by the adjacent inorganic particles and the binder polymer.   
     
     
         4 . The device of  claim 3 , wherein the binder has a solubility parameter of between 15 and 45 MPa 1/2 . 
     
     
         5 . The device of  claim 4 , wherein the binder is polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethyl polyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxymethyl cellulose, acrylonitrile-styrene-butadiene copolymer, polyimide, or a combination comprising at least one of the foregoing. 
     
     
         6 . The device of  claim 1 , wherein
 the binder polymer is interposed between adjacent inorganic particles of the interconnected inorganic particles, and   the binder polymer is in fluid communication with the interstitial volumes.   
     
     
         7 . The device of  claim 6 , wherein the interstitial volumes are defined by a material consisting essentially of the interconnected inorganic particles. 
     
     
         8 . The device of  claim 7 , wherein the interstitial volumes are defined by a material consisting of the interconnected inorganic particles. 
     
     
         9 . The device of  claim 6 , wherein the binder is polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethyl polyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxymethyl cellulose, acrylonitrile-styrene-butadiene copolymer, polyimide, or a combination comprising at least one of the foregoing. 
     
     
         10 . The device of  claim 6 , wherein a surface of the interconnected inorganic particles has a portion on which the inorganic particles are interconnected by the binder polymer, and other portions that define the interstitial volumes. 
     
     
         11 . The device of  claim 1 , wherein the interstitial volumes are configured to receive an electrolyte. 
     
     
         12 . The device of  claim 1 , wherein the interstitial volumes have a size of 0.01 to 1 micrometer. 
     
     
         13 . The device of  claim 1 , having a porosity of 5 to 95 percent. 
     
     
         14 . The device of  claim 13 , wherein an average size of the interstitial volumes is less than an average size of the inorganic particles. 
     
     
         15 . The device of  claim 1 , wherein the composite porous film is dimensionally stable at a temperature of 120° C. or greater. 
     
     
         16 . The device of  claim 15 , wherein the composite porous film retains over 10% of its original size when treated at 150° C. for 1 hour. 
     
     
         17 . The device of  claim 1 , wherein the composite porous film has a thickness of 1 to 100 micrometers. 
     
     
         18 . The device of  claim 1 , wherein the inorganic particles have a dielectric constant of 5 or more. 
     
     
         19 . The device of  claim 1 , wherein the inorganic particles have a dielectric constant of 100 or more. 
     
     
         20 . The device of  claim 1 , wherein the inorganic particles comprise piezoelectric particles. 
     
     
         21 . The device of  claim 1 , wherein the inorganic particles have a size of 0.001 to 10 micrometers. 
     
     
         22 . The device of  claim 1 , wherein the inorganic particles comprise BaTiO 3 , Pb(Zr,Ti)O 3 , Pb 1-x La x Zr 1-y Ti y O 3 , Pb(Mg 3 Nb 2/3 )O 3 —PbTiO 3 , HfO 2 , SrTiO 3 , SnO 2 , CeO 2 , MgO, NiO, CaO, ZnO, ZrO 2 , Y 2 O 3 , Al 2 O 3 , TiO 2 , SiC, LiTi 2 (PO 4 ) 3  or a combination comprising at least one of the foregoing. 
     
     
         23 . The device of  claim 22 , wherein the inorganic particles consist of BaTiO 3 , Pb(Mg 3 Nb 2/3 )O 3 —PbTiO 3 , Pb(Zr,Ti)O 3 , Pb 1-x La x Zr 1-y Ti y O 3 , Al 2 O 3 , LiTi 2 (PO 4 ) 3 , or HfO 2 . 
     
     
         24 . The device of  claim 23 , wherein the binder is polyvinylidene fluoride, polyvinylidene fluoride-hexafluoro propylene copolymer, or carboxymethyl cellulose. 
     
     
         25 . The device of  claim 23 , wherein the inorganic particles consist of BaTiO 3 . 
     
     
         26 . The device of  claim 23 , wherein the inorganic particles consist of a combination of BaTiO 3  and LiTi 2 (PO 4 ) 3  in a weight ratio of 50:50. 
     
     
         27 . The device of  claim 22 , wherein the inorganic particles consist of a combination of BaTiO 3  and Al 2 O 3  in a weight ratio of BaTiO 3  to Al 2 O 3  of 20:80. 
     
     
         28 . The device of  claim 1 , wherein the inorganic particles comprise Li 3 PO 4 , Li x Ti y (PO 4 ) 3  wherein 0&lt;x&lt;2, and 0&lt;y&lt;3; Li x Al y Ti z (PO 4 ) 3  wherein 0&lt;x&lt;2, 0&lt;y&lt;1, and 0&lt;z&lt;3; a (LiAlTiP) x O y  glass wherein 0&lt;x&lt;4, and 0&lt;y&lt;13; Li x La y TiO 3  wherein 0&lt;x&lt;2, and 0&lt;y&lt;3; Li x Ge y P z S w  wherein 0&lt;x&lt;4, 0&lt;y&lt;1, 0&lt;z&lt;1, and 0&lt;w&lt;5; Li x N y  wherein 0&lt;x&lt;4 and 0&lt;y&lt;2; a SiS 2  type glass; Li x Si y S z  wherein 0&lt;x&lt;3, 0&lt;y&lt;2, and 0&lt;z&lt;4; a P 2 S 5  type glass; Li x P y S z  wherein 0&lt;x&lt;3, 0&lt;y&lt;3, and 0&lt;z&lt;7; or a combination comprising at least one of the foregoing. 
     
     
         29 . The device of  claim 28 , wherein the inorganic particles comprise a 14Li 2 O-9Al 2 O 3 -38TiO 2 -39P 2 O 5  glass, Li 3.25 Ge 0.25 P 0.75 S 4 , Li 3 N, a Li 3 PO 4 —Li 2 S—SiS 2  glass, a LiI—Li 2 S—P 2 S 5  glass, or a combination comprising at least one of the foregoing. 
     
     
         30 . The device of  claim 1 , wherein the inorganic particles are present in an amount of 50 to 99 percent by weight, based on a total weight of the composite porous film. 
     
     
         31 . The device of  claim 1 , wherein a weight ratio of the inorganic particles to the binder polymer is 50:50 to 90:10. 
     
     
         32 . The device of  claim 1 , wherein the binder polymer has a dielectric constant of 1 to 100, when measured at 1 kilohertz. 
     
     
         33 . The electrochemical device of  claim 1 , further comprising a porous substrate directly on the composite porous film. 
     
     
         34 . The device of  claim 33 , wherein the porous substrate comprises polyethylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetherether ketone, polyether sulfone, polyphenylene oxide, polyphenylene sulfide, polyethylene naphthalate, or a combination comprising at least one of the foregoing. 
     
     
         35 . The device of  claim 34 , wherein the porous substrate is polyethylene terephthalate, polybutylene terephthalate, or a combination comprising at least one of the foregoing.

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