Carbonaceous material for negative electrode active material for non-aqueous electrolyte secondary batteries, non-aqueous electrolyte secondary battery negative electrode, non-aqueous electrolyte secondary battery, and production method of carbonaceous material

Patent metadata

Field	Value
Publication number	US-11492260-B2
Application number	US-201816628191-A
Country	US
Kind code	B2
Filing date	Jul 4, 2018
Priority date	Jul 6, 2017
Publication date	Nov 8, 2022
Grant date	Nov 8, 2022

Abstract

A problem to be solved by the present invention is to provide a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities and preferably high charge/discharge efficiency as well as low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen element content of 1.0 mass % or more and an oxygen content of 1.5 mass % or less obtained by elemental analysis, a ratio of nitrogen element content and hydrogen element content (RN/H) of 6 or more and 100 or less, a ratio of oxygen element content and nitrogen element content (RO/N) of 0.1 or more and 1.0 or less, and a carbon interplanar spacing (d002) observed by X-ray diffraction measurement of 3.70 Å or more.

First claim

The invention claimed is:

1. A carbonaceous material having a nitrogen content of 1.0 mass % or more and an oxygen content of 1.5 mass % or less as measured by elemental analysis, a ratio of the nitrogen content and a hydrogen content (R N/H ) of 6 or more and 100 or less, a ratio of the oxygen content and the nitrogen content (R O/N ) of 0.1 or more and 1.0 or less, and a carbon interplanar spacing (d 002 ) observed by X-ray diffraction measurement of 3.70 Å or more.

2. The carbonaceous material according to claim 1 , wherein a value of half-value width of a peak near 1360 cm −1 of a Raman spectrum observed by laser Raman spectroscopy is 190 to 270 cm −1 .

3. The carbonaceous material according to claim 1 , wherein a value of half-value width of a peak near 1360 cm −1 of a Raman spectrum observed by laser Raman spectroscopy is 190 to 250 cm −1 .

4. The carbonaceous material according to claim 1 , wherein a value of half-value width of a peak near 1650 cm −1 of a Raman spectrum observed by laser Raman spectroscopy is 100 cm −1 or less.

5. The carbonaceous material according to claim 1 , wherein a half-value width of a peak near 1650 cm −1 of a Raman spectrum observed by laser Raman spectroscopy exceeds 100 cm −1 .

6. The carbonaceous material according to claim 1 , wherein a specific surface area measured by a BET method is 40 m 2 /g or more, and wherein a pore volume represented by a sum of a micropore volume and a mesopore volume is 0.05 mL/g or more.

7. The carbonaceous material according to claim 1 , wherein a specific surface area measured by a BET method is 35 m 2 /g or less, and wherein a pore volume represented by a sum of a micropore volume and a mesopore volume is less than 0.05 mL/g.

8. The carbonaceous material according to claim 1 , wherein the carbonaceous material is derived from a saccharide.

9. A negative electrode active material for a non-aqueous electrolyte secondary battery, wherein the negative electrode active material comprises the carbonaceous material according to claim 1 .

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

11. A non-aqueous electrolyte secondary battery comprising the non-aqueous electrolyte secondary battery negative electrode according to claim 10 .

12. A method of producing the carbonaceous material according to claim 1 , the method comprising:
(1) mixing a saccharide with a substance capable of generating ammonia gas to obtain a mixture;
(2) increasing a temperature of the mixture in an inert gas atmosphere at a temperature increase rate of 100° C./hour or more to a first predetermined temperature between 500 and 1200° C.;
(3) applying a heat treatment at a temperature of 500 to 1200° C. with an inert gas at a flow rate of 0.5 to 5.0 L/min relative to 5 g of the saccharide to obtain a char;
(4) increasing a temperature of the obtained char in an inert gas atmosphere at a temperature increase rate of 100° C./hour or more to a second predetermined temperature between the first predetermined temperature and 1400° C.; and
(5) applying a heat treatment at a temperature of 1000 to 1400° C. with an inert gas at a flow rate of 0.5 to 5.0 L/min relative to 5 g of the char.

13. The method according to claim 12 , wherein the first predetermined temperature is between 800 and 1100° C.

Assignees

• Kuraray Co

Inventors

• Izawa Takafumi
• Tachikawa Kengo
• Iwasaki Hideharu

Classifications

• C01P2002/82

  by IR- or Raman-data · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C01C1/08

  Preparation of ammonia from nitrogenous organic substances · CPC title

• H01M4/587 Primary

  for inserting or intercalating light metals · CPC title

• C01C1/02

  Preparation, {purification} or separation of ammonia · CPC title