Electrode having 3-dimensional pore network structure, lithium battery including electrode, and method of manufacturing electrode

Patent metadata

Field	Value
Publication number	US-9343733-B2
Application number	US-201313775719-A
Country	US
Kind code	B2
Filing date	Feb 25, 2013
Priority date	Jul 31, 2012
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

An electrode having a three-dimensional pore network structure including a fibrous pore channel is disclosed. A lithium battery including the electrode and a method of manufacturing the electrode are also disclosed. The three-dimensional pore network structure formed in the electrode allows for improved mobility of lithium ions in the electrode. Therefore, a lithium battery including the electrode may have improved output characteristics.

First claim

What is claimed is:

1. An electrode, comprising:
a substrate; and
an active material layer formed on at least one surface of the substrate,
the active material layer comprising an active material, and
the active material layer having a fibrous pore channel forming a three-dimensional pore network structure within the active material layer,
the active material layer further comprising a hollow fibrous polymer, and
the fibrous pore channel formed along an inside of the hollow fibrous polymer to form the three-dimensional pore network structure.

2. The electrode of claim 1 , wherein the fibrous pore channel is three-dimensionally tangled within the three dimensional pore network structure.

3. The electrode of claim 1 , wherein an average diameter of the fibrous pore channel is about 2% to about 20% of an average diameter of the active material.

4. The electrode of claim 1 , wherein a total porosity of the active material layer is about 10 to about 40 volume %.

5. The electrode of claim 1 , wherein both a distribution ratio of the fibrous pore channel and a porosity of the active material layer increases from a surface of the active material layer to the substrate.

6. The electrode of claim 5 , wherein the active material layer has a pore distribution gradient from the surface of the active material layer to the substrate such that a porosity of a region of 0 and 50% of a total thickness of the active material layer is about 0 to about 10% of a total porosity of the active material layer, a porosity of a region of 50 and 70% of the total thickness thereof is about 20% to about 40% of the total porosity of the active material layer, and a porosity of a region of 70 and 100% of the total thickness thereof is about 50% to about 80% of the total porosity of the active material layer.

7. The electrode of claim 1 , wherein both ends of the hollow fibrous polymer are open.

8. The electrode of claim 1 , wherein the hollow fibrous polymer is porous.

9. The electrode of claim 1 , wherein a thickness of the active material layer is about 50 to about 200 μm.

10. The electrode of claim 1 , wherein the electrode has an electrode density of about 1.5 to 4.0 g/cc.

11. The electrode of claim 1 , wherein the electrode has an absorbance of 100% within 10 minutes with respect to a non-aqueous electrolytic solution of a lithium salt and an organic solvent.

12. A lithium battery, comprising the electrode of claim 1 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Jin-Hyon
• Han Man-Seok
• Lee Jong-Ki

Classifications

• H01M4/137 Primary

  Electrodes based on electro-active polymers · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title