Electrode Manufacturing Apparatus, Electrode Manufacturing Method, and Electrode for Secondary Battery

Patent metadata

Field	Value
Publication number	US-2024274821-A1
Application number	US-202318567258-A
Country	US
Kind code	A1
Filing date	Feb 13, 2023
Priority date	Feb 14, 2022
Publication date	Aug 15, 2024
Grant date	—

Abstract

A roller including a magnet among the rollers driving the conveyor line suppresses the phenomenon of binder migration during the drying process, thereby improving the adhesion between the active material layer and the electrode current collector, and improving the ionic conductivity of lithium ion.

First claim

1 . An electrode manufacturing device, comprising:
a conveyor line configured to be loaded with electrode sheets having an active material layer formed on a current collector material, the active material layer including an electrode active material, a conductor including a carbon material bonded with a magnetic material, and a binder; a drying furnace for heating the electrode sheets moved by the conveyor line; and rollers for driving the conveyor line, wherein at least one of the rollers is a roller comprising a magnet.

2 . The electrode manufacturing device of claim 1 , wherein
the roller comprising the magnet is located between a starting point on which the electrode sheet with the active material layer is loaded and a point at which the electrode sheet exits through the drying furnace.

3 . The electrode manufacturing device of claim 1 , wherein
the roller comprising the magnet is located within a section where the electrode sheet passes through the drying furnace.

4 . The electrode manufacturing device of claim 1 , wherein
the magnet comprises at least one among a permanent magnet and an electromagnet.

5 . The electrode manufacturing device of claim 4 , wherein
the magnet includes a permanent magnet and the permanent magnet includes at least one neodymium magnets (Ne—Fe—B), a samarium cobalt magnets (Sm—Co), an alnico magnets (Fe—Al—Ni—Co), or a ferrite magnets.

6 . The electrode manufacturing device of claim 1 , wherein
a magnetic field strength formed by the magnet is in a range of 1,000 G to 100,000 G.

7 . The electrode manufacturing device of claim 1 , wherein
the roller comprising the magnet comprises a magnet disposed in an interior hollow of the roller.

8 . The electrode manufacturing device of claim 1 , wherein
the drying furnace is configured to heats the electrode sheet by hot air drying, heating coil drying, or induction heat-drying.

9 . An electrode manufacturing method, comprising:
a transporting step in which an electrode sheet having an active material layer formed on a current collector material is loaded on a conveyor line driven by rollers and transported thereon, the active material layer includes an electrode active material, a conductor, and a binder, wherein the conductor is a carbon material bonded with a magnetic material; and a drying step in which the electrode sheets are heated in a drying furnace located in a moving path of the conveyor line, wherein at least one of the rollers is a roller including a magnet.

10 . The electrode manufacturing method of claim 9 , wherein
content of the conductor and the binder in the electrode sheet subjected to the above drying step satisfies Equation 1 below:

0
.
8

⁢
5

≤

B
top

/

B
bottom

≤

1
.
1

⁢
5

[

Equation
⁢

1

]

in Equation 1,
B top represents combined content (by weight) of the conductor and the binder contained in a 50% area in an upward direction relative to a thickness direction of the active material layer,
B bottom represents combined content (by weight) of the conductor and the binder contained in the 50% area in a downward direction relative to the thickness direction of the active material layer.

11 . The electrode manufacturing method of claim 10 , wherein
the transporting step comprises a process in which the electrode sheet passes through a magnetic field region formed by a roller comprising a magnet.

12 . The electrode manufacturing method of claim 11 , wherein
a strength of the magnetic field formed by the roller comprising a magnet in the electrode sheet is in range of 1,000 G to 100,000 G.

13 . An electrode for secondary battery comprising:
an electrode current collector; and an active material layer comprising an electrode active material, a conductor, and a binder formed on the current collector, wherein the conductor is formed as a carbon material bonded with a magnetic material, and content of the conductor and the binder comprising the active material layer satisfies Equation 1 below:

0
.
8

⁢
5

≤

B
top

/

B
bottom

≤

1
.
1

⁢
5

[

Equation
⁢

1

]

in Equation 1,
B top represents combined content (by weight) of the conductor and the binder contained in a 50% area in an upward direction relative to a thickness direction of the active material layer,
B bottom represents combined content (by weight) of the conductor and the binder contained in the 50% area in a downward direction relative to the thickness direction of the active material layer.

14 . The electrode for secondary battery of claim 13 , wherein
the conductor comprises carbon nanotubes (CNTs) bonded to a magnetic material.

15 . The electrode for secondary battery of claim 13 , wherein the magnetic material comprises one or more of iron (Fe), nickel (Ni), platinum (Pt), ruthenium (Ru), rhodium (Rh), molybdenum (Mo), osmium (Os), iridium (Ir), rhenium (Re), palladium (Pd), vanadium (V), tungsten (W), cobalt (Co), selenium (Se), bismuth (Bi), tin (Sn), chromium (Cr), titanium (Ti), gold (Au), cerium (Ce), silver (Ag), or copper (Cu).

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Il Hyun
• Oh Sang Seung
• Song Ho Kyung
• Kim Shul Kee
• Park Kyu Tae

Classifications

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/13 Primary

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• B65G13/02

  having driven rollers · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title