[DESCRIPTION]
[invention Title]
IMPELLER MIXER FOR ELECTRODE SLURRY
[Technical Field]
The present invention relates to an impeller mixer of
electrode slurry, and more particularly, to an impeller
mixer of electrode slurry which efficiently disperses raw
materials of electrode slurry to allow the raw materials to
be uniformly mixed.
[Background Art]
In general, a mixer is an apparatus for dispersing,
agitating, or mixing contents input into a container, and
is capable of uniformly mixing various contents including
food, medicine, and electronic materials by using a device
installed on a motor, thereby being widely used for
household and industrial fields.
Such a mixer includes a motor converting electric
energy into mechanical energy, and an impeller performing
rotary motion by the converted mechanical energy. The
impeller has blades contacting contents, and thus can mix
contents such as liquid, slurry, and solid by controlling

However, as illustrated in FIG. 1, a related art
impeller mixer includes one or two high-speed rotating
impellers 10 which are smaller in size than a container, to
thereby reduce dispersion efficiency of raw materials.
Moreover, it is difficult to disperse raw materials when
the raw materials are input at once, so that the. raw
materials should be divided and input in sequence, which
requires a long processing time.
[Disclosure]
[Technical Problem]
An aspect of the present invention is to provide an
impeller mixer of electrode slurry for solving above
mentioned shortcomings, and particularly, to provide an
impeller mixer of electrode slurry capable of efficiently
dispersing raw materials of electrode slurry to allow the
raw materials to be uniformly mixed.
[Technical Solution]
According to an aspect of the present invention, there
is provided an impeller mixer of electrode slurry
including: a container filled with raw materials of
electrode slurry; impellers which have different shapes
from each other and are multi-layered, the impellers being

rotatably provided in the container and configured to mix
the raw materials of electrode slurry; and a driving part
disposed on a bottom portion of the container and coupled
to the impellers through a coupling shaft to rotate the
impeller, wherein the coupling shaft is disposed above the
driving part.
The impeller may include a first impeller, a second
impeller, and a third impeller, wherein the first impeller
is disposed adjacent to a bottom surface of the container,
the second impeller is vertically spaced a predetermined
distance from the first impeller, and the third impeller is
vertically spaced another predetermined distance from the
second.
The first impeller may include bars arranged on an
outer circumferential surface of a disk at intervals of a
predetermined angle to move the raw materials of electrode
slurry from bottom to top.
The second impeller may include protrusions disposed
on top and bottom surfaces of a disk to mix the raw
material of electrode slurry.
The third impeller may include bars which are arranged
on an outer circumferential surface of a disk at intervals
of a predetermined angle and of which ends diagonally
protrude in an upward direction, so that the raw material
of electrode slurry move downwardly.

The first impeller may be horizontally longer than the
second impeller, and the second impeller may be
horizontally longer than the third impeller.
The raw material of electrode slurry is a mixture in
which an electrode active material, a conductive material,
and a binder are mixed in a solvent.
An electrode for a secondary battery coated with
electrode slurry manufactured by the impeller mixer of
electrode slurry according to any one of claims 1 to 7.
[Advantageous Effects]
As described above, multi-layered impellers rotating
at a high speed efficiently disperse raw materials of
electrode slurry in a short time and also allow the raw
materials to be uniformly mixed, resulting in an increase
in work efficiency..
[Discription of drawings]
FIG. 1 is a cross-sectional view of a related art
impeller mixer;
FIG. 2 is a cross-sectional view illustrating an
impeller mixer of electrode slurry according to an
embodiment of the present invention;
FIG. 3 illustrates a first impeller in the impeller

mixer of electrode slurry according to an embodiment of the
present invention;
FIG. 4 illustrates a second impeller in the impeller
mixer of electrode slurry according to an embodiment of the
present invention;
FIG. 5 illustrates a third impeller in the impeller
mixer of electrode slurry according to an embodiment of the
present invention; and
FIG. 6 illustrates that raw materials of electrode
slurry are moved by the impeller in the impeller mixer of
electrode slurry according to an embodiment of the present
invention.
[Mode for Invention]
Hereinafter, exemplary embodiments will be described
in detail with reference to the accompanying drawings.
As illustrated in FIGS. 2 to 6, an impeller mixer of
electrode slurry of the present invention includes a
container 100 filled with raw materials, an impeller 110
which is multi-layered and rotatably provided in the
container 100, and a driving part 120 disposed on a bottom
portion of the container 100 to rotate the impeller 110.
As illustrated in FIG. 2, the container 100 has a
space therein, so as to be filled with raw materials of
electrode slurry.

The container 100 may have a cylindrical shape to
maintain a constant clearance between the impeller 110 and
an inner wall of the container 100 when the impeller 110
rotates.
The impeller 110 is rotatably provided in the
container 100 to disperse and mix raw materials of
electrode slurry.
Here, the impeller 110 is composed of a first impeller
111, a second impeller 112, and a third impeller 113, which
layered vertically.
The first impeller 111 may be disposed adjacent to a
bottom surface of the container 100, the second impeller
112 may be vertically spaced a predetermined distance from
the first impeller 111, and the third impeller 113 may be
vertically spaced another predetermined distance from the
second impeller 112.
As illustrated in FIGS. 2 and 3, the first impeller
111 has the shape of a disk HID, and includes bars
arranged on an outer circumferential surface of the disk
HID at intervals of a predetermined angle, so that raw
materials of electrode slurry move upward along the inner
wall of the container 100 when the impeller 110 rotates, as
illustrated in FIGS. 3 and 6.
Here, the first impeller 111 may have a total of three

bars at intervals of 120 degrees.
As illustrated in FIGS. 2 and 5, the third impeller
113 has the shape of a disk 113D, and includes bars which
are arranged on an outer circumferential surface of the
disk 113D at intervals of a predetermined angle and of
which ends diagonally protrude in an upward direction.
Thus, as illustrated in FIGS. 5 and 6, the raw materials of
electrode slurry moved upwardly by the first impeller 111
are moved downwardly due to a slope of the end of the third
impeller 113 when the impeller 110 rotates.
Here, the third impeller 113 may have four bars
arranged at intervals of 90 degree.
As illustrated in FIGS. 2 and 4, the second impeller
112 has the shape of a disk 112D, and includes protrusions
112P (see FIG. 6) disposed on top and bottom surfaces of
the disk 112D. The second impeller 112 is disposed between
the first impeller 111 and the third.impeller 113 thereby
making it possible to mix.the raw materials of electrode
slurry moved upwardly by the first impeller 111 and the raw
materials moved downwardly by the third impeller 113, as
illustrated in FIGS. 4 and 6.
The first impeller 111 is horizontally longer than the
second impeller 112 and the second impeller 112 is
horizontally longer than the third impeller 113, which
enables the raw materials of electrode slurry filled in a

bottom portion of the container 100 to be moved upwardly.
The first impeller 111, the second impeller 112, and
the third impeller 113 basically have a disk shape as
described above, but each may have a different shape
depending on the raw materials of electrode slurry.
The driving part 120 configured to rotate the impeller
110 is disposed on the bottom portion of the container 100
to rotate the impeller 110 at a high speed, and has a
coupling chaft 121 thcrcabovc.
Here, the coupling shaft 121 of the driving part 120
passes through the hnttnm portion nf thp r-nntainer 100 and
is coupled to the impeller 110 to allow the impeller 110 to
be rotated by an operation of the driving part 120.
Like this, according to the present invention, the
multi-layered impeller 110 is rotated by the driving part
120 and raw materials of electrode slurry filled in the
container 100 are efficiently dispersed upwardly and
downwardly by the rotation of the impeller 110 including
the first impeller 111, the second impeller 112, and the
third impeller 113, so that the raw materials can be
uniformly mixed.
The raw material of electrode slurry may be a mixture
in which an electrode active material, a conductive
material, and a binder are mixed in a solvent.
Here, electrode active materials are divided into a

cathode active material and an anode active material, and
the cathode active material may include, although not
limited to, for example, a layered compound such as lithium
cobalt oxide (LiCo02) and lithium nickel oxide (LiNi02) or
a compound substituted with one or more transition metals;
a lithium manganese oxide expressed as chemical formula
Lil+yMn2-y04 (where, y is in the range of 0 to 0.33), LiMn03,
LiMn2C>3, and LiMn02; a lithium copper oxide (Li2Cu02) ; a
vanadium ojcidc ouch ao LiV308, LiFc3CM, V20S, Cu2V207; a Ni
site type lithium nickel oxide expressed as chemical
formula LiNil-yMy02 (where, M is Co, Mn, A1, Cu, Fe, Mg, B
or Ga, and y is in the range of 0.01 to 0.3); a lithium
manganese composite oxide expressed as chemical formula
LiMn2-yMy02 (where, M is Co, Ni, Fe, Cr, Zn or Ta, and y is
in the range of 0.01 to 0.1) or Li2Mn3M08 (where, M is Fe,
Co, Ni, Cu or Zn) ; LiMn204 in which Li is partially
substituted by an alkali earth element ion; a disulfide
compound; and Fe2(Mo04)3- The anode active material may
include, for example, carbon such as non-graphitizable
carbon and graphite-based carbon; a metal composite oxide
such as LixFe2O3(0