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