Method of producing cellulose nonwoven fabric, cellulose nonwoven fabric produced thereby, and secondary ion battery including the same

Patent metadata

Field	Value
Publication number	US-2017331093-A1
Application number	US-201715593056-A
Country	US
Kind code	A1
Filing date	May 11, 2017
Priority date	May 11, 2016
Publication date	Nov 16, 2017
Grant date	—

Abstract

A method of producing a cellulose nonwoven fabric, a cellulose nonwoven fabric produced thereby, and a secondary ion battery including the same, wherein the method includes passing a cellulose suspension with microbial cellulose and a water-soluble cellulose disintegrating agent in a medium through an orifice of a high-pressure homogenizer to obtain a cellulose dispersion and removing the medium from the obtained cellulose dispersion to form the nonwoven fabric.

First claim

What is claimed is:

1 . A method of producing a nonwoven fabric, the method comprising:
passing a cellulose suspension comprising a microbial cellulose and a disintegrating agent in a medium through an orifice of a high-pressure homogenizer to obtain a cellulose dispersion, wherein the disintegrating agent is a water-soluble cellulose and passing the cellulose suspension is performed while applying pressure thereto, wherein the pressure is about 10 MPa to about 300 MPa; and removing the medium from the obtained cellulose dispersion to form the nonwoven fabric, the nonwoven fabric has a tensile strength of 39 MPa to 290 MPa, and the tensile strength is measured in accordance with ASTM D882[0036].

2 . The method of claim 1 , wherein the cellulose suspension is subjected to a pressure drop of 50 MPa or more and a shearing action in the high pressure homogenizer, followed by a bombardment against a solid surface of the impact ring in the high pressure homogenizer.

3 . The method of claim 1 , wherein the passing converts the microbial cellulose into a cellulose nanofiber (CNF).

4 . The method of claim 1 , wherein the water-soluble cellulose is selected from the group consisting of CMC, 2-hydroxyethyl cellulose, and water-soluble cellulose ether.

5 . The method of claim 1 , wherein the cellulose suspension comprises the disintegrating agent in an amount of 1% to 200% by weight, based on the dry weight of microbial cellulose in the cellulose suspension.

6 . The method of claim 1 , wherein the medium is an aqueous medium.

7 . The method of claim 1 , wherein the removing the medium comprises at least one selected from the group consisting of evaporating, filtering, centrifuging, and compressing the obtained cellulose dispersion.

8 . The method of claim 1 , further comprising shaping the obtained cellulose dispersion from the step of passing into a sheet form.

9 . The method of claim 8 , wherein the shaping comprises coating the obtained cellulose dispersion onto a substrate to form a sheet.

10 . The method of claim 8 , wherein the sheet obtained from the step of “removing” has a thickness of about 5 μm to 30 μm.

11 . The method of claim 2 , wherein the high velocity shearing action is a right angle shearing action relative to the direction of flow through the orifice.

12 . The method of claim 1 , wherein the passing is repeated 1 to 10 times.

13 . The method of claim 1 , wherein the disintegrating agent is CMC having a weight average molecular weight of 60,000 Da to 500,0000 Da.

14 . The method of claim 1 , further comprising removing the disintegrating agent from the obtained cellulose dispersion.

15 . The method of claim 1 , wherein the method further comprises mixing the obtained cellulose dispersion with a pore forming agent in an aqueous medium before the step of removing.

16 . The method of claim 15 , wherein the pore forming agent is selected from the group consisting of polyethylene glycol (PEG), polypropylene alcohol, polypropylene and hydroxy cellulose.

17 . The method of claim 1 , wherein the cellulose suspension comprises 0.1% to 1% by weight of dry microbial cellulose, based on the total weight of the suspension.

18 . A cellulose nonwoven fabric produced by the method of claim 1 , the cellulose nonwoven fabric has a tensile strength of 39 MPa to 290 Mpa, and the tensile strength is measured in accordance with ASTM D882.

19 . A lithium ion battery comprising a nonwoven fabric of claim 18 as a separator.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Minsang
• Byun Jongwon
• Chung Soonchun
• Lee Sunghaeng
• Kang Jinkyu
• Park Jinhwan

Classifications

• C08B11/02

  Alkyl or cycloalkyl ethers · CPC title

• C08B3/00

  Preparation of cellulose esters of organic acids {(rendering cellulose suitable for esterification C08B1/02)} · CPC title

• H01M2/145

  Electricity · mapped topic

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2/1626 Primary

  Electricity · mapped topic