Three-dimensional structure electrode and electrochemical element including same

Patent metadata

Field	Value
Publication number	US-11495802-B2
Application number	US-201916959860-A
Country	US
Kind code	B2
Filing date	Oct 16, 2019
Priority date	Oct 18, 2018
Publication date	Nov 8, 2022
Grant date	Nov 8, 2022

Abstract

The present invention relates to a three-dimensional structure electrode, a method for manufacturing same, and an electrochemical element including the electrode. The present invention is characterized by comprising: (a) an upper conductive layer and a lower conductive layer which have a structure constituting an assembly within which a conductive material and a porous nonwoven fabric including a plurality of polymeric fibers are three-dimensionally connected in an irregular and continuous manner, thereby forming a mutually connected porous structure; and (b) an active material layer forming the same assembly structure as the conductive layers and forming a three-dimensionally filled structure in which electrode active material particles are uniformly filled inside the mutually connected porous structure formed in the assembly structure, wherein the active material layer is formed between the upper conductive layer and the lower conductive layer.

First claim

The invention claimed is:

1. An electrode having a three-dimensional aggregate structure, the electrode comprising:
(a) an upper conductive layer and a lower conductive layer each having a respective structure in which a porous nonwoven fabric including a plurality of polymer fibers and a conductive material are three-dimensionally, irregularly, and continuously connected within the three-dimensional aggregate structure, the three-dimensional aggregate structure having an interconnected pore structure formed therein; and
(b) an active material layer disposed within the three-dimensional aggregate structure, wherein electrode active material particles are uniformly filled in the interconnected pore structure formed in the three-dimensional aggregate structure,
wherein the active material layer is disposed between the upper conductive layer and the lower conductive layer, the electrode active material particles being disposed only within the active material layer, and
wherein the upper conductive layer and the lower conductive layer each have a porosity that is smaller than a porosity of the active material layer.

2. The electrode of claim 1 , wherein a thickness of the electrode is 3 to 1000 μm.

3. The electrode of claim 1 , wherein the upper conductive layer and the lower conductive layer each have a thickness of 3 to 30% of the active material layer, respectively, and
wherein a porosity of each of the upper conductive layer and the lower conductive layer is 5 to 80% by volume.

4. The electrode of claim 1 , wherein the upper conductive layer or the lower conductive layer includes 10 to 50% by weight of the conductive material and 50 to 90% by weight of the porous nonwoven fabric with respect to a total weight of the respective upper or lower conductive layer.

5. The electrode of claim 1 , wherein the conductive material is one selected from the group consisting of: carbon nanotube (CNT), silver nanowire, nickel nanowire, gold nanowire, graphene, graphene oxide, reduced graphene oxide, polypyrrole, poly 3,4-ethylenedioxythiophene, polyaniline, derivatives thereof, and mixtures thereof.

6. The electrode of claim 1 , wherein a polymer constituting the plurality of polymer fibers is one or more selected from the group consisting of: polyethylene terephthalate, polyimide, polyamide, polysulfone, polyvinylidene fluoride, polyacrylonitrile, polyethylene, polypropylene, polyetherimide, polyvinyl alcohol, polyethylene oxide, polyacrylic acid, polyvinylpyrrolidone, agarose, alginate, polyvinylidene hexafluoropropylene, polyurethane, nylon 6, polypyrrole, poly 3,4-ethylenedioxythiophene, polyaniline, derivatives thereof, and mixtures thereof.

7. The electrode of claim 1 , wherein the active material particles are selected from the group consisting of: lithium metal oxide, carbonaceous material, oxide, silicon (Si), tin (Sn), germanium (Ge), sulfur (S), derivatives thereof, and mixtures thereof.

8. The electrode of claim 1 , wherein the upper conductive layer and the lower conductive layer are configured to suppress detachment of the active material particles from the active material layer.

Assignees

• Lg Chemical Ltd
• Ulsan Nat Inst Science & Tech Unist
• Lg Energy Solution Ltd

Inventors

• Uhm In Sung
• Lee Sang Young
• Kwon Yo Han
• Kim Ju Myung
• Lim Joon Won
• Lee Jae Hyun
• Kim Je Young
• Kim Seong Hyeok

Classifications

• H01G11/06

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0525

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/139

  Processes of manufacture · CPC title