ELECTRODE, METHOD FOR PREPARING THE SAME, AND ELECTROCHEMICAL CAPACITOR INCLUDING THE SAME

• US 20130170100A1
• Filed: 12/31/2012
• Published: 07/04/2013
• Est. Priority Date: 12/29/2011
• Status: Abandoned Application

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: LEE, Sang Kyun, KIM, Bae Kyun, JUNG, Hyun Chul
• Application Number:
  US13/732,121
• Publication Number:
  US 20130170100A1
• Time in Patent Office: Days
• US Class Current: 361/502
• CPC Class Codes: H01G 11/24 characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
• CPC Class Codes: H01G 11/28 arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
• CPC Class Codes: H01G 11/38 Carbon pastes or blends; Binders or additives therein
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

Disclosed herein are an electrode including a plurality of electrode active material layers formed above an electrode current collector, each of the electrode active material layers including different structures of binders; a method for manufacturing the same; and an electrochemical capacitor.

• • According to the present invention, physical bonding strength of the electrode can be significantly improved, and thus, long-term reliability of the electrochemical capacitor can be improved, by developing an electrode in which the binder composition of a bonding portion of an electrode and an electrode current collector and the binder composition between the electrode active material layers are differentiated from one another, in order to develop low-resistance EDLC products.

Claims

1. An electrode comprising a plurality of electrode active material layers formed above an electrode current collector, wherein each of the electrode active material layers includes different structures of binders.

2. The electrode according to claim 1, wherein the electrode active material layer contacted with the electrode current collector contains 60 to 95 wt % of a point-bonding type binder based on the solid content of total binders therein;

and each of the electrode active material layers contacted with each other contains 10 to 20 wt % of a line-bonding type binder based on the solid content of total binders therein.

3. The electrode according to claim 2, wherein the point-bonding type binder is at least one selected from the group consisting of styrene-butadiene rubber (SBR), butadiene rubber, acryl-based rubber, polyvinylpyrrolidone (PVP), isoprene rubber, and carboxylic methyl cellulose (CMC).

4. The electrode according to claim 2, wherein the line-bonding type binder is at least one selected from the group consisting of polytetrafluoroethylene (PTFE), polyvinylidenefluoride (PVDF), and polyvinyl formamide (PVFA).

10. An electrochemical capacitor comprising the electrode according to claim 1.

11. The electrochemical capacitor according to claim 10, wherein the electrode is any one or both of a cathode and an anode.

5. A method for manufacturing an electrode, comprising:

forming a first electrode active material layer by coating an electrode active material composition including a point-bonding type binder as a main component on an electrode current collector; and

forming a second electrode active material layer by coating an electrode active material composition including a line-bonding type binder on the first electrode active material layer.

6. The method according to claim 5, wherein the point-bonding type binder included in the first electrode active material layer is contained in 60 to 95 wt % based on the solid content of total binders therein.

7. The method according to claim 5, wherein the line-bonding type binder included in the second electrode active material layer is contained in 10 to 20 wt % based on the solid content of total binders therein.

8. The method according to claim 5, further comprising forming a plurality of electrode active material layers above the second electrode active material layer.

9. The method according to claim 8, wherein the plurality of electrode active material layers formed above the second electrode active material layer are formed by coating an electrode active material composition including 10 to 20 wt % of a line-bonding type binder based on the solid content of total binders therein.