Electrode for electrochemcal device, method for manufacturing the same, and electrochemcal device including the same

Patent metadata

Field	Value
Publication number	US-2017294656-A1
Application number	US-201715477178-A
Country	US
Kind code	A1
Filing date	Apr 3, 2017
Priority date	Apr 7, 2016
Publication date	Oct 12, 2017
Grant date	—

Abstract

Provided are an electrode capable of maintaining electrical conductivity during elongation and shrinkage, a method for manufacturing the same, and electrochemical device including the same.

First claim

What is claimed is:

1 . An electrode for an electrochemical device, comprising
a composite film including an elastic polymer matrix and a first conductive material embedded in the elastic polymer matrix; a conductive film disposed on the composite film and including a second conductive material; and an electrode active material layer disposed on the conductive film, wherein each of the first conductive material and the second conductive material are a gold nanosheet.

2 . The electrode for an electrochemical device of claim 1 , wherein the gold nanosheet has a diameter of about 10 μm to about 20 μm.

3 . The electrode for an electrochemical device of claim 1 , wherein the gold nanosheet has a thickness of about 2 nm to about 5 nm.

4 . The electrode for an electrochemical device of claim 1 , wherein the elastic polymer matrix includes one of block copolymers represented by Chemical Formulae 1 to 4:
A-block-B  [Chemical Formula 1]
A-block-B-block-C  [Chemical Formula 2]
A-block-B-block-C-block-D  [Chemical Formula 3]
wherein, in Chemical Formulae 1 to 3, A, B, C, and D are the same or different and are independently one of polystyrene, polybutadiene, polybutylene, polyethylene, polyurethane, polyisoprene, or a derivative thereof.

5 . The electrode for an electrochemical device of claim 1 , wherein the first conductive material is uniformly dispersed and embedded inside the polymer matrix.

6 . The electrode for an electrochemical device of claim 1 , wherein a weight ratio of the first conductive material/the polymer matrix in the composite film ranges from about 10/100 to about 20/100.

7 . The electrode for an electrochemical device of claim 1 , wherein the conductive film is disposed on one surface or both surfaces of the composite film.

8 . The electrode for an electrochemical device of claim 7 , wherein the electrode active material layer is disposed on one surface of the conductive film.

9 . The electrode for an electrochemical device of claim 1 , wherein the electrode active material layer includes an electrode active material having a particle diameter of about 100 nm to about 200 nm.

10 . The electrode for an electrochemical device of claim 1 , wherein the composite film has a thickness of about 20 μm to about 40 μm.

11 . The electrode for an electrochemical device of claim 1 , wherein the conductive film has a thickness of about 1 μm to about 10 μm.

12 . The electrode for an electrochemical device of claim 1 , wherein the active material layer has a thickness of about 1 μm to about 5 μm.

13 . The electrode for an electrochemical device of claim 1 , wherein the first conductive material is included in an amount of about 10 wt % to about 20 wt %, the second conductive material is included in an amount of about 30 wt % to about 40 wt %, the electrode active material layer is included in an amount of about 10 wt % to about 15 wt %, and the polymer matrix is included in a balance based on a total amount, 100 wt % of the electrode.

14 . A method for manufacturing an electrode for an electrochemical device, comprising
transferring a first conductive material on a substrate to form a first conductive film; spin-coating an elastic polymer solution on the first conductive film to disperse the elastic polymer solution inside and outside the first conductive film; drying the dispersed elastic polymer solution to form an elastic polymer matrix and to obtain a composite film including a first conductive material embedded inside the elastic polymer matrix; transferring a second conductive material on the composite film to form a second conductive film; and forming an active material layer on the second conductive film, wherein each of the first conductive material and the second conductive material are a gold nanosheet,

15 . The method of claim 14 , wherein the spin-coating of an elastic polymer solution on the first conductive film to disperse the elastic polymer solution inside and outside the first conductive film is performed at a rotation speed of about 1000 rpm to about 2000 rpm.

16 . The method of claim 14 , wherein the drying of the dispersed elastic polymer solution to form an elastic polymer matrix and to obtain a composite film including a first conductive material embedded inside the elastic polymer matrix is performed at a temperature range of about 70° C. to about 80° C.

17 . The method of claim 14 , wherein the transferring of the second conductive material on the composite film to form a second conductive film is transferring the second conductive material on one surface or both surfaces of the composite film twice or more.

18 . The method of claim 14 , wherein the forming of the active material layer on the second conductive film is performed by spin coating, transferring, spraying, electro-spinning, a hydrothermal synthesis method, a polyol synthesis method, or a solid-phase method.

19 . The method of claim 14 , wherein the transferring of the first conductive material on a substrate to form a first conductive film is transferring the first conductive material on one surface of the substrate twice or more.

20 . An electrochemical device, comprising
a positive electrode; a negative electrode; and an electrolyte between the positive electrode and the negative electrode, wherein at least one electrode of the positive electrode and the negative electrode is the electrode of claim 1 .

21 . The electrochemical device of claim 20 , wherein the electrolyte is a gel polymer electrolyte.

22 . The electrochemical device of claim 20 , wherein the electrochemical device is packed with PDMS (polydimethlysiloxane).

23 . The electrochemical device of claim 20 , wherein the electrochemical device is a rechargeable lithium battery, a sodium rechargeable battery, or a super capacitor.

24 . The electrochemical device of claim 20 , wherein the electrochemical device is applied to a driving power of a wearable apparatus or a flexible apparatus.

Assignees

• Unist(Ulsan Nat Inst Of Science And Technology)
• Postech Academy-Industry Found

Inventors

• Park Soo Jin
• Song Woo Jin
• Bae So Hyeon
• Jeong Un Yong
• Song Jun Hyuk

Classifications

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M4/622

  being polymers · CPC title

• H01G11/26

  characterised by their structure, e.g. multi-layered, porosity or surface features · CPC title

• H01G11/68

  characterised by their material · CPC title