Heat-resistant porous film, separator for nonaqueous battery, and nonaqueous battery

Patent metadata

Field	Value
Publication number	US-9287544-B2
Application number	US-201113821728-A
Country	US
Kind code	B2
Filing date	Oct 3, 2011
Priority date	Oct 3, 2011
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

A nonaqueous battery having a high level of safety and high-temperature storability, a heat-resistant porous film capable of serving as a separator material for separating positive and negative electrodes from each other and capable of forming the nonaqueous battery, and a separator capable of forming the nonaqueous battery are provided.

First claim

The invention claimed is:

1. A heat-resistant porous film formed on a porous base material for forming a separator for a nonaqueous battery or on an electrode used in a nonaqueous battery,
wherein the heat-resistant porous film comprises at least an organic binder and particles having a heat-resistant temperature of 130° C. or higher,
the heat-resistant porous film has pores capable of transmitting Li ions in the nonaqueous battery,
as the organic binder, the heat-resistant porous film comprises a polymer having a backbone derived from a polymeric double bond and a group having a cyclic structure including an amide bond, the polymer having a glass transition temperature of 130° C. or higher and a weight-average molecular weight of 350,000 or more, and
a 180° peel strength between the heat-resistant porous film and the porous base material or the electrode is 0.6 N/cm or more.

2. The heat-resistant porous film according to claim 1 , wherein in the polymer having a backbone derived from a polymeric double bond and a group having a cyclic structure including an amide bond, the group having a cyclic structure including an amide bond is a group represented by the following chemical formula (1) and the polymer has a glass transition temperature of 150° C. or higher:

3. The heat-resistant porous film according to claim 1 , wherein the polymer having a backbone derived from a polymeric double bond and a group having a cyclic structure including an amide bond is polyvinyl pyrrolidone.

4. The heat-resistant porous film according to claim 1 , further comprising resin particles having a melting point of 80 to 150° C.

5. The heat-resistant porous film according to claim 1 , further comprising particles that swell in a nonaqueous electrolyte at a temperature of 80 to 150° C. due to an increase in the amount of the nonaqueous electrolyte absorbed by the particles.

6. A separator for a nonaqueous battery, wherein a porous base material and the heat-resistant porous film according to claim 1 are integrated with each other.

7. The separator according to claim 6 , wherein the porous base material is a polyolefin microporous film.

8. The separator according to claim 6 , wherein the separator has a thermal shrinkage of 5% or less at 150° C.

9. A nonaqueous battery comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte,
wherein the heat-resistant porous film according to claim 1 is integrated with at least one of the positive electrode and the negative electrode.

10. A nonaqueous battery comprising a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte,
wherein the separator is the separator according to claim 6 .

Assignees

• Matsumoto Nobuaki
• Kanzaki Hisao
• Hitachi Maxell

Inventors

• Matsumoto Nobuaki
• Kanzaki Hisao

Classifications

• H01M10/4235 Primary

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M50/451

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

• H01M50/423

  Polyamide resins · CPC title

• H01M50/42

  Acrylic resins · CPC title

• H01M50/417

  Polyolefins · CPC title