Organic/inorganic composite porous membrane, and separator and electrode structure comprising the same

Patent metadata

Field	Value
Publication number	US-2016118636-A1
Application number	US-201414895423-A
Country	US
Kind code	A1
Filing date	Oct 31, 2014
Priority date	Oct 31, 2013
Publication date	Apr 28, 2016
Grant date	—

Abstract

The present disclosure provides an organic/inorganic composite porous membrane, comprising: one or more particles selected from inorganic particles and organic particles; and a binder polymer, wherein said one or more particles selected from inorganic particles and organic particles are bonded with each other by the binder polymer surrounding the surface of the particles, and said one or more particles are filled at a rate of 60 to 70% in the membrane.

First claim

1 . An organic/inorganic composite porous membrane, comprising: one or more particles selected from inorganic particles and organic particles; and a binder polymer, wherein said one or more particles selected from inorganic particles and organic particles are bonded with each other by the binder polymer surrounding the surface of the particles, and said one or more particles are filled at a rate of 60 to 70% in the membrane.

2 . The organic/inorganic composite porous membrane of claim 1 , wherein the binder polymer is present at an amount of 1 to 30 parts by weight based on 100 parts by weight of one or more particles selected from the inorganic particles and the organic particles.

3 . The organic/inorganic composite porous membrane of claim 1 , wherein the inorganic particles are selected from the group consisting of inorganic particles having a dielectric constant of 5 or higher, inorganic particles having the ability to transport lithium ions, and a mixture thereof.

4 . The organic/inorganic composite porous membrane of claim 1 , wherein the organic particles are selected from the group consisting of polyethylene (PE), polystyrene (PS), polymethylmethacylate (PMMA), polyacetal (polyoxymethylene, POM), polyamide (PA), polycarbonate (PC), modified polyphenylene ether (m-PPE), polybutylene terephthalate (PBT), and a mixture thereof.

5 . The organic/inorganic composite porous membrane of claim 1 , wherein the binder polymer is selected from the group consisting of polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxyl methyl cellulose, acrylonitrile-styrene-butadiene copolymer, polyimide, polystyrene, polyethylene, and a mixture thereof.

6 . The organic/inorganic composite porous membrane of claim 1 , wherein in the organic/inorganic composite porous membrane, one or more particles selected from inorganic particles and organic particles are filled and bound to each other by the binder polymer, from which interstitial volumes are formed between the particles, and the interstitial volumes between the particles become empty spaces to form pores.

7 . The organic/inorganic composite porous membrane of claim 1 , wherein the organic/inorganic composite porous membrane has a thickness of 0.5 to 50 μm.

8 . A method for preparing an organic/inorganic composite porous membrane for an electrochemical device, comprising providing unit particles where one or more particles selected from inorganic particles and organic particles or an agglomerate of the particles are surrounded with a binder polymer; and applying heat to the unit particles to make the unit particles be bonded with each other.

9 . The method of claim 8 , wherein the unit particles have an average diameter of 0.01 to 20 μm.

10 . The method of claim 8 , wherein the binder polymer in the unit particles is present at an amount of 1 to 30 parts by weight based on 100 parts by weight of one or more particles selected from the inorganic particles and the organic particles.

11 . The method of claim 8 , wherein the step of applying heat to the unit particles is carried out at a temperature of 5 to 100° C. higher than the melting point of the binder polymer, for bonding of the unit particles.

12 . The method of claim 8 , wherein the inorganic particles are selected from the group consisting of inorganic particles having a dielectric constant of 5 or higher, inorganic particles having the ability to transport lithium ions, and a mixture thereof.

13 . The method of claim 8 , wherein the organic particles are selected from the group consisting of polyethylene (PE), polystyrene (PS), polymethylmethacylate (PMMA), polyacetal (enylenePOM), polyamide (PA), polycarbonate (PC), modified polyphenylene ether (m-PPE), polybutylene terephthalate (PBT), and a mixture thereof.

14 . The method of claim 8 , wherein the binder polymer is selected from the group consisting of polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polymethylmethacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate polyethylene-co-vinyl acetate, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethyl polyvinyl alcohol, cyanoethyl cellulose, cyanoethyl sucrose, pullulan, carboxyl methyl cellulose, acrylonitrile-styrene-butadiene copolymer, polyimide, polystyrene, polyethylene, and a mixture thereof.

15 . The method of claim 8 , wherein in the organic/inorganic composite porous membrane, one or more particles selected from inorganic particles and organic particles are filled and bound to each other by the binder polymer, from which interstitial volumes are formed between the particles, and the interstitial volumes between the particles become empty spaces to form pores.

16 . The method of claim 8 , wherein the organic/inorganic composite porous membrane has a thickness of 0.5 to 50 μm.

17 . An electrochemical device, comprising a cathode, an anode, and a separator interposed between the cathode and the anode,
wherein the separator is the organic/inorganic composite porous membrane of claim 1 .

18 . An electrochemical device, comprising a cathode, an anode, and a separator interposed between the cathode and the anode,
wherein the separator comprises a porous substrate having multiple pores, and the organic/inorganic composite porous membrane of claim 1 , formed on at least one surface of the porous substrate.

19 . An electrode structure, comprising an electrode current collector; an electrode active material layer formed on at least one surface of the electrode current collector; and the organic/inorganic composite porous membrane of claim 1 , formed on another surface of the electrode current collector.

20 . An electrochemical device, comprising a cathode, an anode, and an electrolyte solution, wherein at least one of the cathode and the anode is the electrode structure of claim 19 .

Assignees

• Lg Chemical Ltd

Inventors

• Jin Sun-Mi
• Yu Hyung-Kyun
• Lee Joo-Sung

Classifications

• C08J5/2206 Primary

  based on organic and/or inorganic macromolecular compounds · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title