Porous carbon material for electric double-layer capacitor electrode, method of producing the same, and electric double-layer capacitor electrode

Patent metadata

Field	Value
Publication number	US-2018374657-A1
Application number	US-201716060602-A
Country	US
Kind code	A1
Filing date	Jun 2, 2017
Priority date	Jun 6, 2016
Publication date	Dec 27, 2018
Grant date	—

Abstract

A porous carbon material for an electric double-layer capacitor electrode, in which the porous carbon material is formed from secondary particles having a particle size of from 3 μm to 100 μm, the secondary particles are formed from primary particles having a particle size of from 0.1 μm to 0.5 μm, and the porous carbon material has an internal specific surface area of 900 m 2 /g or greater.

First claim

1 . A porous carbon material for an electric double-layer capacitor electrode, wherein
the porous carbon material is formed from secondary particles having a particle size of from 3 μm to 100 μm, the secondary particles are formed from primary particles having a particle size of from 0.1 μm to 0.5 μm, and the porous carbon material has an internal specific surface area of 900 m 2 /g or greater.

2 . The porous carbon material according to claim 1 , wherein
the primary particles are bonded to each other by neck growth.

3 . The porous carbon material according to claim 1 , wherein
the porous carbon material has an external specific surface area of from 5 m 2 /g to 50 m 2 /g.

4 . The porous carbon material according to claim 1 , wherein
a peak of a pore size of micropores in the porous carbon material is in a range of from 7.0 Å to 10 Å which is calculated by a QSDFT method from a nitrogen adsorption isotherm.

5 . The porous carbon material according to claim 1 , wherein
a pore volume of micropores in the porous carbon material is 0.3 cm 3 /g or greater which is calculated by a t method from a nitrogen adsorption isotherm, and a pore size of the micropores is 0.63 nm or greater which is calculated by the t method from the nitrogen adsorption isotherm.

6 . The porous carbon material according to claim 1 , wherein
a pore volume of mesopores in the porous carbon material is 0.1 cm 3 /g or greater which is calculated by a BJH method from a nitrogen adsorption isotherm.

7 . A method of producing a porous carbon material for an electric double-layer capacitor electrode, the method comprising steps of:
obtaining a porous carbon material precursor, in which secondary particles having a particle size of from 3 μm to 100 μm are formed, by aggregation of primary particles having a particle size of from 0.1 μm to 0.5 μm from a raw material of porous carbon material; and obtaining a porous carbon material by heat treatment of the porous carbon material precursor.

8 . The method of producing the porous carbon material according to claim 7 , wherein
the porous carbon material precursor has an external specific surface area of from 5 m 2 /g to 50 m 2 /g.

9 . The method of producing the porous carbon material according to claim 7 , wherein
the raw material of porous carbon material is a mixture of SiO 2 and a carbon-containing material, and the mixture is heated at 1450° C. or higher under an inert gas atmosphere, thereby obtaining the porous carbon material precursor.

10 . The method of producing the porous carbon material according to claim 9 , wherein
a molar ratio of SiO 2 and C in the mixture satisfies a relation of SiO 2 :C=1:3 to 1:4.

11 . The method of producing the porous carbon material according to claim 7 , wherein
the raw material of porous carbon material is a raw material of chaff which is obtained by carbonizing and crushing chaff, a molar ratio of SiO 2 and C in the raw material of chaff satisfies a relation of SiO 2 :C=1:3 to 1:4, and the raw material of chaff is heated at 1450° C. or higher under an inert gas atmosphere, thereby obtaining the porous carbon material precursor.

12 . The method of producing the porous carbon material according to claim 11 , wherein
the raw material of chaff is subjected to acid treatment before the porous carbon material precursor is obtained.

13 . The method of producing the porous carbon material according to claim 9 , wherein
the porous carbon material precursor is subjected to heat treatment under a chlorine atmosphere, thereby obtaining the porous carbon material.

14 . The method of producing the porous carbon material according to claim 13 , wherein
the heat treatment under the chlorine atmosphere is performed at a temperature of from 700° C. to 1100° C.

15 . The method of producing the porous carbon material according to claim 13 , further comprising a step of:
subjecting the porous carbon material to activation treatment by heat treatment of the porous carbon material under a water vapor atmosphere or a CO 2 atmosphere.

16 . The method of producing the porous carbon material according to claim 7 , wherein
the porous carbon material precursor is a hydrocarbon-based precursor obtained by heating and sintering a hydrocarbon-based raw material, and the heat treatment is activation treatment under a water vapor atmosphere or a CO 2 atmosphere.

17 . The method of producing the porous carbon material according to claim 15 , wherein
the activation treatment is performed at a temperature of from 700° C. to 1000° C.

18 . The method of producing the porous carbon material according to claim 7 , wherein
the raw material of porous carbon material is a mixture of Si and a carbon-containing material, a molar ratio of Si and C in the mixture satisfies a relation of Si:C=1:1.1 to 1:1.5, and the raw material of porous carbon material is heated at 1250° C. or higher under an inert gas atmosphere, thereby obtaining the porous carbon material precursor.

19 . An electric double-layer capacitor electrode comprising the porous carbon material according to claim 1 .

Assignees

• Sumitomo Electric Industries

Inventors

• Ishikawa Shinji
• Saito Takahiro

Classifications

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• H01G11/24 Primary

  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 title

• C01B32/324

  from waste materials, e.g. tyres or spent sulfite pulp liquor · CPC title

• H01G11/44

  Raw materials therefor, e.g. resins or coal · CPC title

• C01B32/336

  characterised by gaseous activating agents · CPC title