ACTIVATED CARBON FOR ELECTROCHEMICAL ELEMENT AND ELECTROCHEMICAL ELEMENT USING THE SAME

• US 20110111284A1
• Filed: 06/19/2009
• Published: 05/12/2011
• Est. Priority Date: 06/24/2008
• Status: Abandoned Application

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Maeshima, Hiroyuki, Shimamoto, Hideki, Yamada, Chiho
• Application Number:
  US13/000,177
• Publication Number:
  US 20110111284A1
• Time in Patent Office: Days
• US Class Current: 429/163
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/28004 Sorbent size or size distribution, e.g. particle size
• CPC Class Codes: B01J 20/2803 Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
• CPC Class Codes: B01J 20/28069 Pore volume, e.g. total pore volume, mesopore volume, micropore volume
• CPC Class Codes: C01B 32/30 Active carbon
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/14 Pore volume
• CPC Class Codes: C01P 2006/16 Pore diameter
• 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 11/34 characterised by carbonisation or activation of carbon
• CPC Class Codes: H01G 11/60 characterised by the solvent
• CPC Class Codes: H01G 11/62 characterised by the solute, e.g. salts, anions or cations therein
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

Van der Waals molecular diameters of a cation, an anion, and a solvent contained in an electrolytic solution are denoted by Lc, La, and Ls, respectively. The minimum widths of van der Waals molecules of the cation, anion, and solvent are denoted by Lmin,c, Lmin,a, and Lmin,s, respectively. The maximum values of Lc, La, Ls, Lmin,c, Lmin,a, and Lmin,s is denoted by W1. The minimum values of (Lc+La), (Lc+Ls), (La+Ls), (Lmin,c+Lmin,a), (Lmin,c+Lmin,s), and (Lmin,a+Lmin,s) is denoted by W2. Under these definitions, the total pore volume of the activated carbon in which a slit width obtained by the MP method is W1 or more and W2 or less is 15% or more of the total pore volume in which the slit width is 2.0 nm or less.

Claims

1. Activated carbon used for an electrochemical element comprising the activated carbon and an electrolytic solution,

wherein under definitions that van der Waals molecular diameters of a cation, an anion, and a solvent contained in the electrolytic solution are denoted by Lc, La, and Ls, respectively;

minimum widths of van der Waals molecules of the cation, the anion, and the solvent are denoted by Lmin,c, Lmin,a, and Lmin,s, respectively;

a maximum value of Lc, La, Ls, Lmin,c, Lmin,a, and Lmin,s is denoted by W1; and

a minimum values of (Lc+La), (Lc+Ls), (La+Ls), (Lmin,c+Lmin,a), (Lmin,c+Lmin,s), and (Lmin,a+Lmin,s) is denoted by W2,

a total pore volume of the activated carbon in which a slit width obtained by an MP method is W1 or more and W2 or less is 15% or more of a total pore volume in which the slit width is 2.0 nm or less.

2. The activated carbon used for an electrochemical element according to claim 1, wherein a total pore volume of the activated carbon in which the slit width obtained by the MP method is W2 or less is 0.9 ml/g or more.

3. The activated carbon used for an electrochemical element according to claim 2, wherein W2 is 1.1 nm.

4. The activated carbon used for an electrochemical element according to claim 1, wherein W1 is 1.0 nm, and W2 is 1.1 nm.

5. The activated carbon used for an electrochemical element according to claim 1, wherein the electrolytic solution includes at least one or more cations represented by chemical formula (I):

6. The activated carbon used for an electrochemical element according to claim 1, wherein the electrolytic solution includes at least any of tetrafluoroborate and hexafluorophosphate as an anion.

7. The activated carbon used for an electrochemical element according to claim 1, wherein the electrolytic solution includes 1-ethyl-2,3-dimethyl imidazolium as a cation, tetrafluoroborate as an anion, and at least propylene carbonate as a solvent.

8. An electrochemical element comprising:

a positive electrode;

a negative electrode;

an electrolytic solution provided between the positive electrode and the negative electrode; and

a case accommodating the positive electrode, the negative electrode, and the electrolytic solution,

wherein at least one of the positive electrode and the negative electrode has activated carbon used for an electrochemical element according to claim 1.

9. The electrochemical element according to claim 8, wherein a total pore volume of the activated carbon in which a slit width obtained by an MP method is W2 or less is 0.9 ml/g or more.

10. The electrochemical element according to claim 9, wherein W2 is 1.1 nm.

11. The electrochemical element according to claim 8, wherein W1 is 1.0 nm and W2 is 1.1 nm.

12. The electrochemical element according to claim 8, wherein the electrolytic solution includes at least one or more cations represented by chemical formula (I).

13. The electrochemical element according to claim 8, wherein the electrolytic solution includes at least one of tetrafluoroborate and hexafluorophosphate as an anion.

14. The electrochemical element according to claim 8, wherein the electrolytic solution includes 1-ethyl-2,3-dimethyl imidazolium as a cation, tetrafluoroborate as an anion, and at least propylene carbonate as a solvent.