Multi-component composite film method for preparing the same

• US 7,470,488 B2
• Filed: 08/11/2001
• Issued: 12/30/2008
• Est. Priority Date: 08/12/2000
• Status: Expired due to Term

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chemical Co Ltd (LG Corporation)
• Inventors: Ahn, Soon-Ho, Lee, Seung-Jin, Lee, Sang-Young, Park, Soon-Yong, Cho, Jin-Yeon, Kyung, You-Jin, Yong, Hyun-Hang, Lee, Hyang-Mok, Ahn, Byeong-In, Lee, Hyung-Keun, Song, Heon-Sik
• Primary Examiner(s): Maples; John S
• Application Number:
  US10/110,047
• Publication Number:
  US 20020187401A1
• Time in Patent Office: 2,698 Days
• Field of Search: None
• US Class Current: 429/303
• CPC Class Codes: B01D 2323/34 Use of radiation
• CPC Class Codes: B01D 2325/20 Specific permeability or cut-off range
• CPC Class Codes: B01D 2325/26 Electrical properties
• CPC Class Codes: B01D 67/0027 by stretching
• CPC Class Codes: B01D 67/0083 Thermal after-treatment
• CPC Class Codes: B01D 67/009 with wave-energy, particle-radiation or plasma
• CPC Class Codes: B01D 69/1213 Laminated layers
• CPC Class Codes: B01D 69/1214 Chemically bonded layers, e.g. cross-linking
• CPC Class Codes: B01D 69/1216 Three or more layers
• CPC Class Codes: B01D 69/148 Organic/inorganic mixed matrix membranes
• CPC Class Codes: B01D 71/261 Polyethylene
• CPC Class Codes: B01D 71/262 Polypropylene
• CPC Class Codes: B01D 71/76 Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74 rubbers in general B01D71/24
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 50/403 Manufacturing processes of separators, membranes or diaphragms
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/426 Fluorocarbon polymers
• CPC Class Codes: H01M 50/451 comprising layers of only organic material and layers containing inorganic material
• CPC Class Codes: H01M 50/457 comprising three or more layers
• CPC Class Codes: H01M 50/489 : Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• CPC Class Codes: H01M 6/181 : with polymeric electrolytes
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries

Abstract

The present invention provides a multi-component composite film comprising a) polymer support layer; and b) porous gellable polymer layer which is formed on one side or both sides of the support layer of a), wherein the support film of a) and the gellable polymer layer of b) are unified without the interface, a method for preparing the same, and a polymer electrolyte system applied the same.

Claims

1. A multi-component composite membrane comprising:

a) a polymeric support layer film having a pore size ranging from 0.001 μ

m to 10 μ

m; and

b) a porous gellable polymer layer formed on one side or both sides of the polymeric support layer film comprising a polymer-lithium salt complex and having a pore size of less than 10 μ

m,

wherein the polymeric support layer film comprises at least one material selected from the group consisting of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, polypropylene, high crystalline polypropylene, polyethylene-propylene copolymer, polyethylene-butylene copolymer, polyethylene-hexene copolymer, polyethylene-octene copolymer, polystyrene-butylene-styrene copolymer, polystyrene-ethylene-butylene-styrene copolymer, polystyrene, polyphenylene oxide, polysulfone, polycarbonate, polyester, polyamide, polyurethane, polyacrylate, polyvinylidene chloride, polyvinylidene fluoride, polysiloxane, polyolefin ionomer, polymethyl pentene, hydrogenated oligocyclopentadiene (HOCP), and a copolymer thereof or a derivative thereof,

the polymer of the polymer-lithium salt complex is at least one material selected from the group consisting of polyvinylidene fluoride, polyvinylidene fluoride-chlorotrifluoroethylene copolymer, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, polypropylene oxide, polybutylene oxide, polyurethane, polyacrylonitrile, polyacrylate, polymethyl methacrylate, polyacrylic acid, polyamide, polyacrylamide, polyvinyl acetate, polyvinylpyrrolidone, polytetraethylene glycol diacrylate, polyphenylene oxide, polyester, polyvinylidene chloride polysiloxane, polyolefin ionomer, and a copolymer thereof,

the lithium salt of the polymer-lithium salt complex is at least one lithium salt selected from the group consisting of LiSCN, LiClO₄, LiCF₃SO₃, LiAsF₆, LiN(CF₃SO₂)₂, and LiBF₄,

the polymeric support layer film and the gellable layer are joined directly to each other, and an interfacial adhesive strength measured by the method according to JIS Z 0237 between the polymeric support layer film and the porous gellable polymer layer is from 150 to 250 g_f, and

an air permeability of the multi-component composite membrane is from 100 to 20,000 sec/100 cc.

2. The multi-component composite membrane according to claim 1, wherein the high crystalline polypropylene has at least one property selected from the group consisting of a density equal to or greater than 0.905 g/cc, a melting point equal to or greater than 164°

C., a crystallization temperature equal to or greater than 125°

C., crystallinity equal to or greater than 50%, isotacticity (or a Pentad ratio) equal to or greater than 96%, and atactic ratio less than 5%.

3. The multi-component composite membrane according to claim 1, wherein the polymeric support layer film of a) is a blended film or a laminated film.

4. The multi-component composite membrane according to claim 1, wherein the gellable polymer layer comprises at least one porous inorganic particle selected from the group consisting of SiO₂, TiO₂, Al₂O₃, MgO, and B₂ O₃.

5. The multi-component composite membrane according to claim 1, wherein a thickness of the polymeric support layer film ranges from 1 to 50 μ

m, and a thickness of the porous gellable polymer layer ranges from 0.01 to 25 μ

m.

6. A polymer separator comprising the multi-component composite membrane according to claim 1.