Carbonaceous material for negative electrodes of lithium ion capacitors and method for producing same

Patent metadata

Field	Value
Publication number	US-9508494-B2
Application number	US-201314424676-A
Country	US
Kind code	B2
Filing date	Aug 30, 2013
Priority date	Aug 30, 2012
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

The object of the present invention is to provide a manufacturing method of carbonaceous material for a negative electrode of lithium ion capacitors, wherein the carbonaceous material is obtained from plant-derived char as a source, potassium and iron are sufficiently removed, and an average particle diameter thereof is small; and a carbonaceous material for a negative electrode of lithium ion capacitors.
The object can be solved by a method for manufacturing a carbonaceous material having an average diameter of 3 to 30 μm, for a negative electrode of lithium ion capacitors comprising the steps of: (1) heating plant-derived char having an average particle diameter of 100 to 10000 μm at 500° C. to 1250° C. under an inert gas atmosphere containing a halogen compound to demineralize in a gas-phase, (2) pulverizing a carbon precursor obtained by the demineralization in a gas-phase, (3) calcining the pulverized carbon precursor at less than 1100° C. under a non-oxidizing gas atmosphere.

First claim

The invention claimed is:

1. A method for manufacturing a non-graphitizable carbonaceous material derived from a plant having an average particle diameter of 3 to 30 μm and a specific surface area of 47 to 175 m 2 /g, for a negative electrode of lithium-ion capacitors comprising the steps of:
(1) heating plant-derived char having an average particle diameter of 100 to 10000 μm at 500° C. to 1250° C. under an inert gas atmosphere containing a chlorine compound to demineralize in the gas-phase, so that an amount of potassium in the resulting carbonaceous material is 0.1 weight % or less, and an amount of iron in the resulting carbonaceous material is 0.02 weight % or less,
(2) pulverizing a carbon precursor demineralized in the gas-phase, and
(3) heat treating the pulverized carbon precursor at less than 1100° C. under a non-oxidizing gas atmosphere.

2. The method for manufacturing a non-graphitizable carbonaceous material derived from a plant for a negative electrode of lithium-ion capacitors according to claim 1 , further comprises a step of removing particles having a particle diameter of 1 μm or less so that a volume thereof became 3 volume % or less, during or after the pulverizing step (2).

3. A non-graphitizable carbonaceous material derived from a plant having an average particle diameter of 3 to 30 μm and a specific surface area of 47 to 175 m 2 /g, for a negative electrode of lithium-ion capacitors, obtained by a method comprising the steps of:
(1) heating plant-derived char having an average particle diameter of 100 to 10000 μm at 500° C. to 1250° C. under an inert gas atmosphere containing a chlorine compound to demineralize in the gas-phase, so that an amount of potassium in the resulting carbonaceous material is 0.1 weight % or less, and an amount of iron in the resulting carbonaceous material is 0.02 weight % or less,
(2) pulverizing a carbon precursor demineralized in the gas-phase, and
(3) heat treating the pulverized carbon precursor at less than 1100° C. under an non-oxidizing gas atmosphere.

4. The non-graphitizable carbonaceous material derived from a plant for a negative electrode of lithium-ion capacitors according to claim 3 , wherein the method further comprises a step of removing particles having a particle diameter of 1 μm or less so that a volume thereof became 3 volume % or less, during or after the pulverizing step (2).

5. The non-graphitizable carbonaceous material derived from a plant for a negative electrode of lithium-ion capacitors according to claim 3 , wherein the specific surface area is 47 to 150 m 2 /g,
the amount of potassium contained in the resulting carbonaceous material is 0.1 weight % or less, and
the amount of iron contained therein is 0.02 weight % or less.

6. A negative electrode of lithium-ion capacitors comprising the non-graphitizable carbonaceous material according to claim 3 .

7. The negative electrode of lithium-ion capacitors according to claim 6 , wherein an active material layer exists on one surface or both surfaces of metal current collector, and a thickness of the active material layer on one surface is 80 μm or less.

8. A lithium-ion capacitor comprising the non-graphitizable carbonaceous material according to claim 3 .

9. A lithium-ion capacitor comprising the non-graphitizable carbonaceous material according to claim 6 .

Assignees

• Kureha Corp
• Kuraray Co
• Kuraray Chemical Kk

Inventors

• Sonobe Naohiro
• Tada Yasuhiro
• Masuko Jiro
• Komatsu Hajime
• Arima Junichi
• OGAWA Akimi
• Koyakumaru Kenichi
• Otsuka Kiyoto
• Iwasaki Hideharu
• Cho Junsang

Classifications

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G11/34 Primary

  characterised by carbonisation or activation of carbon · CPC title

• C01P2006/80

  Compositional purity · CPC title

• C01B31/02

  Chemistry & Metallurgy · mapped topic

• H01G11/66

  Current collectors · CPC title