Carbonaceous material for negative electrodes of nonaqueous electrolyte secondary batteries and method for producing same

Patent metadata

Field	Value
Publication number	US-9478805-B2
Application number	US-201314424903-A
Country	US
Kind code	B2
Filing date	Aug 30, 2013
Priority date	Aug 30, 2012
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

Provided is a manufacturing method of carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries, wherein the carbonaceous material is obtained from plant-derived char as a source, potassium is sufficiently removed, and an average particle diameter thereof is small; and a carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries. The method for manufacturing a carbonaceous material having an average particle diameter of 3 to 30 μm, for a negative electrode of non-aqueous electrolyte secondary batteries includes 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 halogen compound to demineralize in a gas-phase, (2) pulverizing a carbon precursor obtained by demineralization in a gas-phase, (3) calcining the pulverized carbon precursor at 1000° C. to 1600° C. under an non-oxidizing gas atmosphere.

First claim

The invention claimed is:

1. A method for manufacturing a carbonaceous material having an average particle diameter of 3 to 30 μm, for a negative electrode of non-aqueous electrolyte secondary batteries comprising the steps of:
(1) heating plant-derived char having an average particle diameter of 100 to 10000 μm at 850° C. to 1250° C. under an inert gas atmosphere containing a chlorine compound to demineralize the plant-derived char in a gas-phase,
(2) pulverizing a carbon precursor obtained by the demineralization of the plant-derived char in a gas-phase, and
(3) heat treating the pulverized carbon precursor at 1000° C. to 1600° C. under a non-oxidizing gas atmosphere.

2. The method for manufacturing a carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries according to claim 1 , further comprises a step of removing particles having a particle diameter of 1 μm or less so that an amount of the particle diameter of 1 μm or less became 3 volume % or less in the pulverized carbon precursor, during or after the pulverizing step (2).

3. A carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries, obtained by the method of claim 1 ,
wherein an average particle diameter is 3 to 30 μm,
an amount of element potassium is 0.1 weight % or less, and
an amount of element iron is 0.02 weight % or less.

4. The carbonaceous material according to claim 3 , comprising particles having a particle diameter of 1 μm or less account for 3.0 volume % or less.

5. The carbonaceous material according to claim 3 , comprising a specific surface area is 1 to 50 m 2 /g.

6. A negative electrode of a non-aqueous electrolyte secondary battery comprising the carbonaceous material according to claim 3 .

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

8. A non-aqueous electrolyte secondary battery comprising the negative electrode according to claim 6 .

9. A non-aqueous electrolyte secondary battery comprising the carbonaceous material according to claim 3 .

10. A vehicle having the non-aqueous electrolyte secondary battery according to claim 9 .

Assignees

• Kureha Corp
• Kuraray Co
• Kuraray Chemical Kk

Inventors

• Tada Yasuhiro
• Ebihara Yasushi
• KOMATSU Mayu
• Masuko Jiro
• Komatsu Hajime
• Sonobe Naohiro
• Arima Junichi
• OGAWA Akimi
• Tago Shinya
• Koyakumaru Kenichi
• Iwasaki Hideharu
• Otsuka Kiyoto

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/587 Primary

  for inserting or intercalating light metals · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic