Manufacturing method of an electrode for electrochemical element and an electrochemical element

Patent metadata

Field	Value
Publication number	US-9306208-B2
Application number	US-201213980633-A
Country	US
Kind code	B2
Filing date	Jan 23, 2012
Priority date	Jan 21, 2011
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

Disclosed is a manufacturing method of an electrode for an electrochemical element having a superior adhesion and is used for an electrochemical element with excellent productivity due to a short predoping time. Specifically disclosed is that the method is characterized by comprising a step for compression forming of electrode material (a mixed powder or composite particles) including an alkaline metal powder or an alkaline earth metal powder each having a coated surface.

First claim

The invention claimed is:

1. A manufacturing method of an electrode for an electrochemical element by compression forming a mixed powder including an alkaline metal powder or an alkaline earth metal powder, each having a coated surface,
wherein the method comprises: (1A) a preparing step of composite particles (A) including an electrode active material and a water dispersible binding agent; (2A) a preparing step of a mixed powder by dry mixing the composite particles (A) and the alkaline metal powder or the alkaline earth metal powder, each having a coated surface; (3A) a foaming step of an electrode composition layer by compression forming the mixed powder; and (4A) an integration step of the electrode composition layer and a current collector.

2. The manufacturing method of the electrode for the electrochemical element according to claim 1 , wherein (3A) is the foaming step of the electrode composition layer on a substrate by compression forming the mixed powder.

3. The manufacturing method of the electrode for the electrochemical element according to claim 2 , comprising a detachment step of the substrate from an electrode composition layer surface, performed after the (4A) step.

4. The manufacturing method of the electrode for the electrochemical element according to claim 2 , wherein the substrate is subjected to a roughening treatment.

5. The manufacturing method of an electrode for an electrochemical element according to claim 1 , wherein a mean volume particle diameter of the alkaline metal powder or the alkaline earth metal powder each having a coated surface is 1 to 100 μm.

6. A manufacturing method of an electrode for an electrochemical element by compression forming composite particles (B) including an alkaline metal powder or an alkaline earth metal powder, each having a coated surface,
wherein the method comprises: (1B) a preparing step of the composite particles (B) including an electrode active material, a binding agent, and an alkaline metal powder or an alkaline earth metal powder, each having a coated surface; (2B) a foaming step of an electrode composition layer by compression forming the composite particles (B); and (3B) an integration step of the electrode composition layer and a current collector.

7. The manufacturing method of the electrode for the electrochemical element according to claim 6 , wherein (2B) is the foaming step of electrode composition layer on a substrate by compression forming the composite particles (B).

8. The manufacturing method of the electrode for the electrochemical element according to claim 7 , comprising a detachment step of the substrate from an electrode composition layer surface, performed after the (3B) step.

9. The manufacturing method of the electrode for the electrochemical element according to claim 6 , wherein a conductive adhesive layer is formed on at least one surface of the current collector.

10. The manufacturing method of an electrode for an electrochemical element according to claim 6 , wherein the step (1B) comprises:
(1B-1) a slurry preparation step wherein the electrode active material, the binding agent and the alkaline metal powder or the alkaline earth metal powder each having a coated surface are mixed in a non-aqueous solvent; and
(1B-2) a composite particles preparation step by granulating the slurry.

11. The manufacturing method of the electrode for the electrochemical element according to claim 10 , wherein the granulation is a spray drying granulation.

12. The manufacturing method of the electrode for the electrochemical element according to claim 1 , wherein the alkaline metal powder or the alkaline earth metal powder each having a coated surface is an alkaline metal powder or an alkaline earth metal powder each having a polymer coated surface, and
a difference between solubility parameter (SP value) of the polymer and that of a solvent used for an electrolyte of the electrochemical element is within a range of 0.3 to 5.0 (cal/cm 3 ) 1/2 .

13. An electrochemical element equipped with the electrode for an electrochemical element obtained from the method according to claim 1 .

14. The manufacturing method of the electrode for the electrochemical element according to claim 3 , wherein the substrate is subjected to a roughening treatment.

15. The manufacturing method of an electrode for an electrochemical element according to claim 2 , wherein a mean volume particle diameter of the alkaline metal powder or the alkaline earth metal powder each having a coated surface is 1 to 100 μm.

16. The manufacturing method of an electrode for an electrochemical element according to claim 3 , wherein a mean volume particle diameter of the alkaline metal powder or the alkaline earth metal powder each having a coated surface is 1 to 100 μm.

17. The manufacturing method of an electrode for an electrochemical element according to claim 4 , wherein a mean volume particle diameter of the alkaline metal powder or the alkaline earth metal powder each having a coated surface is 1 to 100 μm.

18. The manufacturing method of the electrode for the electrochemical element according to claim 7 , wherein a conductive adhesive layer is formed on at least one surface of the current collector.

19. The manufacturing method of the electrode for the electrochemical element according to claim 8 , wherein a conductive adhesive layer is formed on at least one surface of the current collector.

20. The manufacturing method of an electrode for an electrochemical element according to claim 7 , wherein the step (1B) comprises:
(1B-1) a slurry preparation step wherein the electrode active material, the binding agent and the alkaline metal powder or the alkaline earth metal powder each having a coated surface are mixed in a non-aqueous solvent; and
(1B-2) a composite particles preparation step by granulating the slurry.

Assignees

• Isshiki Yasuhiro
• Wakizaka Yasuhiro
• Zeon Corp

Inventors

• Isshiki Yasuhiro
• Wakizaka Yasuhiro

Classifications

• H01M4/622

  being polymers · CPC title

• Y02P70/54

  Cross-Sectional Technologies · mapped topic

• H01M4/366

  as layered products · CPC title

• H01M10/054

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

• H01M4/0435

  Rolling or calendering · CPC title