Protective film and composition for preparing the same, slurry, and electrical storage device

Patent metadata

Field	Value
Publication number	US-9522995-B2
Application number	US-201214352549-A
Country	US
Kind code	B2
Filing date	Oct 4, 2012
Priority date	Oct 18, 2011
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

An electrical storage device includes a cathode, an anode, a protective film that is provided between the cathode and the anode, and an electrolyte solution, the protective film including a polymer that includes a repeating unit derived from a fluorine-containing monomer, and a repeating unit derived from an unsaturated carboxylic acid.

First claim

The invention claimed is:

1. An electrical storage device comprising a cathode, an anode, a protective film that is present between the cathode and the anode, and an electrolyte solution,
wherein the protective film comprises a polymer comprising from 15 to 60 parts by mass of a repeating unit derived from a fluorine-containing monomer, and a repeating unit derived from an unsaturated carboxylic acid monomer,
wherein the fluorine-containing monomer is a fluorine-containing olefin monomer or a fluorine-containing (meth)acrylate monomer, and
wherein the unsaturated carboxylic acid monomer is at least one member selected from the group consisting of a monocarboxylic acid and a dicarboxylic acid.

2. The electrical storage device according to claim 1 , wherein the protective film is in contact with at least one surface selected from the group consisting of a surface of the cathode and a surface of the anode.

3. The electrical storage device according to claim 1 , further comprising a separator that is present between the cathode and the anode.

4. The electrical storage device according to claim 3 , wherein a surface of the separator is covered with the protective film.

5. The electrical storage device according to claim 3 , wherein the protective film is held between the cathode or the anode, and the separator in a contact state.

6. The electrical storage device according to claim 1 , wherein the protective film comprises a polymer comprising:
from 15 to 40 parts by mass of a repeating unit derived from the fluorine-containing monomer,
from 1 to 10 parts by mass of a repeating unit derived from the unsaturated carboxylic acid monomer, and
from 30 to 84 parts by mass of a repeating unit derived from an unsaturated (meth)acrylate,
based on 100 parts by mass of the repeating units of the polymer.

7. An electrical storage device comprising a cathode, an anode, a protective film that is disposed between the cathode and the anode, and an electrolyte solution,
wherein the protective film comprises a polymer comprising
from 15 to 60 parts by mass of repeating unit derived from the fluorine-containing monomer,
from 1 to 10 parts by mass of repeating unit derived from the unsaturated carboxylic acid monomer,
from 30 to 70 parts by mass of repeating unit derived from an unsaturated (meth)acrylate, and
from 5 to 40 parts of mass of repeating unit derived from an alpha,beta-unsaturated nitrile compound selected from the group consisting of acrylonitrile, methacrylonitrile, alpha-chloroacylonitrile, alpha-ehtylacrylonitrile, vinylidene cyanide, and a combination thereof,
based on 100 parts by mass of the polymer.

8. The electrical storage device according to claim 7 , further comprising a separator that is present between the cathode and the anode.

9. The electrical storage device according to claim 8 , wherein the protective film is present on the in contact with a surface of the separator.

10. The electrical storage device according claim 1 , wherein the protective film comprises:
the polymer, said polymer in the form of a distribution of polymer particles having a number average particle size of 20 nm to 450 nm; and
inorganic particles selected from the group consisting of silica particles, titanium oxide particles, aluminum oxide particles, zirconium oxide particles, magnesium oxide particles and a mixture thereof each having a number average particle size of 0.1 microns to 0.8 microns, and
wherein the protective film is the form of a dried film.

Assignees

• Jsr Corp

Inventors

• Otsuka Yoshiharu
• Kitaguchi Hironori
• Fujihara Nobuyuki

Classifications

• H01M50/414

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

• C08L27/16 Primary

  Homopolymers or copolymers or vinylidene fluoride · CPC title

• C08K3/22

  of metals · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01M2/1673

  Electricity · mapped topic