Polyolefin microporous membrane and method of producing the same, separator for non-aqueous secondary battery and non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-2016006012-A1
Application number	US-201514857263-A
Country	US
Kind code	A1
Filing date	Sep 17, 2015
Priority date	Mar 24, 2010
Publication date	Jan 7, 2016
Grant date	—

Abstract

The present invention provides a separator for a non-aqueous secondary battery, the separator including: a polyolefin microporous membrane having a degree of crystallinity of from 60 to 85% and a tie molecular volume fraction of from 0.7 to 1.7%; and a heat resistant porous layer containing a heat resistant resin and provided on one side or both sides of the polyolefin microporous membrane.

First claim

What is claimed is:

1 . A separator for a non-aqueous secondary battery, the separator comprising:
a polyolefin microporous membrane having a degree of crystallinity of from 60 to 85% and a tie molecular volume fraction of from 0.7 to 1.7%; and a heat resistant porous layer containing a heat resistant resin and provided on one side or both sides of the polyolefin microporous membrane.

2 . The separator for a non-aqueous secondary battery according to claim 1 , wherein the heat resistant resin is at least one resin selected from the group consisting of fully aromatic polyamides, polyimides, polyamide imides, polysulfones, polyketones, polyetherketones, polyether imides and cellulose.

3 . The separator for a non-aqueous secondary battery according to claim 1 , wherein the heat resistant porous layer further contains an inorganic filler.

4 . The separator for a non-aqueous secondary battery according to claim 2 , wherein the heat resistant porous layer further contains an inorganic filler.

5 . The separator for a non-aqueous secondary battery according to claim 3 , wherein the inorganic filler is at least one of aluminium hydroxide or magnesium hydroxide.

6 . The separator for a non-aqueous secondary battery according to claim 4 , wherein the inorganic filler is at least one of aluminium hydroxide or magnesium hydroxide.

7 . The separator for a non-aqueous secondary battery according to claim 1 , wherein the tie molecular volume fraction of the polyolefin is from 0.7 to 1.5%.

8 . The separator for a non-aqueous secondary battery according to claim 1 , wherein a number average molecular weight is from 30,000 to 80,000.

9 . The separator for a non-aqueous secondary battery according to claim 1 , wherein a number of short chain branches contained in 1000 carbon atoms in a main chain of the polyolefin is from 1 to 5.

10 . The separator for a non-aqueous secondary battery according to claim 1 , comprising a polyolefin containing an ultra-high molecular weight polyethylene having a weight-average molecular weight of 1,000,000 or higher and a high-density polyethylene having a density of 0.942 g/cm 3 .

11 . A non-aqueous secondary battery, comprising:
a positive electrode; a negative electrode; and the separator for a non-aqueous secondary battery according to claim 1 , which is disposed between the positive electrode and the negative electrode, and wherein an electromotive force is obtained by doping and dedoping lithium.

12 . A non-aqueous secondary battery, comprising:
a positive electrode; a negative electrode; and the separator for a non-aqueous secondary battery according to claim 2 , which is disposed between the positive electrode and the negative electrode, and wherein an electromotive force is obtained by doping and dedoping lithium.

13 . A non-aqueous secondary battery, comprising:
a positive electrode; a negative electrode; and the separator for a non-aqueous secondary battery according to claim 3 , which is disposed between the positive electrode and the negative electrode, and wherein an electromotive force is obtained by doping and dedoping lithium.

14 . A non-aqueous secondary battery, comprising:
a positive electrode; a negative electrode; and the separator for a non-aqueous secondary battery according to claim 4 , which is disposed between the positive electrode and the negative electrode, and wherein an electromotive force is obtained by doping and dedoping lithium.

15 . A non-aqueous secondary battery, comprising:
a positive electrode; a negative electrode; and the separator for a non-aqueous secondary battery according to claim 5 , which is disposed between the positive electrode and the negative electrode, and wherein an electromotive force is obtained by doping and dedoping lithium.

16 . A non-aqueous secondary battery, comprising:
a positive electrode; a negative electrode; and the separator for a non-aqueous secondary battery according to claim 6 , which is disposed between the positive electrode and the negative electrode, and wherein an electromotive force is obtained by doping and dedoping lithium.

17 . A non-aqueous secondary battery, comprising:
a positive electrode; a negative electrode; and the separator for a non-aqueous secondary battery according to claim 7 , which is disposed between the positive electrode and the negative electrode, and wherein an electromotive force is obtained by doping and dedoping lithium.

18 . A non-aqueous secondary battery, comprising:
a positive electrode; a negative electrode; and the separator for a non-aqueous secondary battery according to claim 8 , which is disposed between the positive electrode and the negative electrode, and wherein an electromotive force is obtained by doping and dedoping lithium.

19 . A non-aqueous secondary battery, comprising:
a positive electrode; a negative electrode; and the separator for a non-aqueous secondary battery according to claim 9 , which is disposed between the positive electrode and the negative electrode, and wherein an electromotive force is obtained by doping and dedoping lithium.

20 . A non-aqueous secondary battery, comprising:
a positive electrode; a negative electrode; and the separator for a non-aqueous secondary battery according to claim 10 , which is disposed between the positive electrode and the negative electrode, and wherein an electromotive force is obtained by doping and dedoping lithium.

Assignees

• Teijin Ltd

Inventors

• Sano Hiroki
• Nishikawa Satoshi
• Yoshitomi Takashi

Classifications

• B32B27/34 Primary

  comprising polyamides · CPC title

• H01M50/451

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

• H01M50/494

  Tensile strength · CPC title

• H01M50/423

  Polyamide resins · CPC title

• H01M50/417

  Polyolefins · CPC title