Heat-resistant porous separator and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016006011-A1
Application number	US-201514746824-A
Country	US
Kind code	A1
Filing date	Jun 22, 2015
Priority date	Jul 3, 2014
Publication date	Jan 7, 2016
Grant date	—

Abstract

The present disclosure provides a heat-resistant porous separator. The heat-resistant porous separator includes a porous substrate and a composite coating layer coated on at least one surface of the substrate. The composite coating layer is an interpenetrating polymer network structure formed by a hydrophilic polymer and silicon dioxide. A method for manufacturing a heat-resistant porous separator is also provided herein.

First claim

What is claimed is:

1 . A heat-resistant porous separator, comprising:
a porous substrate; and a composite coating layer coated on at least one surface of the porous substrate, wherein the composite coating layer is an interpenetrating polymer network structure formed by a hydrophilic polymer and silicon dioxide.

2 . The heat-resistant porous separator according to claim 1 , wherein the porous substrate is made from high density polyethylene, polypropylene, polyvinyl chloride, polyvinyl fluoride, polyester, polyamide or a combination thereof.

3 . The heat-resistant porous separator according to claim 1 , wherein the silicon dioxide is formed through hydrolysis and condensation reactions of silicon dioxide precursor.

4 . The heat-resistant porous separator according to claim 3 , wherein the weight ratio of the hydrophilic polymer and the silicon dioxide precursor is in the range of 0.008 to 1.5.

5 . The heat-resistant porous separator according to claim 1 , wherein the hydrophilic polymer is selected from the group consisting of ethylene vinyl-alcohol copolymer, polyvinyl alcohol and a combination thereof.

6 . The heat-resistant porous separator according to claim 1 , wherein the composite coating layer further comprises a dispersant.

7 . The heat-resistant porous separator according to claim 6 , wherein the dispersant is selected from the group consisting of vinyltrimethoxysilane, 3-glycidyloxypropyltrimethoxysilane, 3-aminopropyltriethoxysilane, methacryloyl propyltrimethoxysilane and a combination thereof.

8 . A method for manufacturing a heat-resistant porous separator, comprising:
providing a porous substrate; adding 0.2 to 1.5 parts by weight of a hydrophilic polymer into 90 to 98 parts by weight of a solvent to form a reaction solution; mixing 1 to 25 parts by weight of silicon dioxide precursor into the reaction solution to form a mixed solution; adding a aqueous hydrochloric acid solution into the mixed solution to conduct hydrolysis and condensation reactions of silicon dioxide precursor to form a clear solution; coating the clear solution on at least one surface of the porous substrate to form a composite coating layer; and drying the porous substrate with the composite coating layer thereon to form a heat-resistant porous separator.

9 . The method according to claim 8 , wherein the hydrophilic polymer is selected from the group consisting of ethylene vinyl-alcohol copolymer, polyvinyl alcohol and a combination thereof.

10 . The method according to claim 8 , wherein the solvent is selected from the group consisting of water, ethanol, isopropanol, methanol and a combination thereof.

11 . The method according to claim 8 , wherein the silicon dioxide precursor is selected from the group consisting of tetraethoxy silane, tetramethoxy silane, trimethoxy silane and a combination thereof.

12 . The method according to claim 8 , wherein the porous substrate is made from high density polyethylene, polypropylene, polyvinyl chloride, polyvinyl fluoride, polyester, polyamide or a combination thereof.

13 . The method according to claim 8 , wherein before the step of adding the aqueous hydrochloric acid solution into the mixed solution, further comprises a step of adding a dispersant into the mixed solution.

14 . The method according to claim 13 , wherein the dispersant is selected from the group consisting of 3-aminopropyltriethoxysilane, methacryloyl propyltrimethoxysilane vinyltrimethoxysilane, 3-glycidyloxypropyltrimethoxysilane, and a combination thereof.

Assignees

• Benq Materials Corp

Inventors

• Chen Hsin-Wei

Classifications

• H01M50/403 Primary

  Manufacturing processes of separators, membranes or diaphragms · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M2/145

  Electricity · mapped topic