METHOD FOR SEPARATING ACTIVE MATERIAL OF ELECTRODE PLATE FOR STORAGE BATTERY

• US 20090095631A1
• Filed: 12/20/2006
• Published: 04/16/2009
• Est. Priority Date: 12/27/2005
• Status: Active Grant

• Current Assignee: Omega Techno Modeling Co., Ltd., Panasonic EV Energy Company, Limited (Toyota Motor Corporation)
• Original Assignee: Omega Techno Modeling Co., Ltd., Panasonic EV Energy Company, Limited (Toyota Motor Corporation)
• Inventors: Kamo, Takashi, Shukuri, Kyoichi, Kuramoto, Shunji
• Granted Patent: US 8,354,180 B2
• Time in Patent Office: Days
• US Class Current: 204/554
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 10/54 Reclaiming serviceable parts of waste accumulators
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/242 Hydrogen storage electrodes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02W 30/84 Recycling of batteries or fuel cells
• CPC Class Codes: Y10T 29/53135 Storage cell or battery

Abstract

An electrode plate (20) for storage batteries is immersed into an aqueous solution (18) containing phosphoric acid, an ethoxy alcohol, ammonium bifluoride, sulfonic acid and sodium xylenesulfonate, and the aqueous solution (18) is stirred by a screw stirrer (22). The aqueous solution (18) is kept at about 30° C. by a heater (14), and the active material of the electrode (20) is separated therefrom. The aqueous solution (18) contains the respective solutes in the following mass ratios: 15-20 parts by mass of the phosphoric acid; 3-7 parts by mass of the ethoxy alcohol; 2-6 parts by mass of the ammonium bifluoride; 4-8 parts by mass of the sulfonic acid; and 1-3 parts by mass of the sodium xylenesulfonate.

Claims

1. A method for separating an active material of an electrode plate for a storage battery, in a process of separating an active material from a substrate of an electrode plate for a storage battery in which the electrode plates formed by coating or filling the substrates with the active material are positioned opposite each other with a separator interposed therebetween, the method comprising:

immersing the electrode plates for a storage battery in an aqueous solution containing a phosphoric acid as a solute.

2. The method for separating an active material of an electrode plate for a storage battery according to claim 1, wherein the aqueous solution further contains an ethoxy alcohol, ammonium bifluoride, a sulfonic acid, and sodium xylenesulfonate.

3. The method for separating an active material of an electrode plate for a storage battery according to claim 2, wherein percentage contents of the solutes in the aqueous solution are 15 to 20 parts by mass of the phosphoric acid;

3 to 7 parts by mass of the ethoxy alcohol;

2 to 6 parts by mass of the ammonium bifluoride;

4 to 8 parts by mass of the sulfonic acid; and

1 to 3 parts by mass of the sodium xylenesulfonate.

4. The method for separating an active material of an electrode plate for a storage battery according to claim 1, wherein, in the process of separating the active material from the substrate, the electrode plate for a storage battery is immersed in the aqueous solution while the aqueous solution is being stirred, to thus maintain constantly a state of the aqueous solution on a separated surface.

5. The method for separating an active material of an electrode plate for a storage battery according to claim 1, wherein, after the electrode plate has been immersed in the aqueous solution, the surface of the electrode plate is subjected to brushing under predetermined load.

6. The method for separating an active material of an electrode plate for a storage battery according to claim 1, wherein a concentration of the phosphoric acid in the aqueous solution is between 1.5 mass percents and 20 mass percents.

7. The method for separating an active material of an electrode plate for a storage battery according to claim 1, wherein a temperature of the aqueous solution is about 30°

C.