# US 11,440,799 B2 · Carbon material and method for manufacturing carbon material

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- Number: US 11,440,799 B2
- Document ID: US11440799B2
- Status: Granted
- Kind: B2
- Application number: 16/332,868
- Filed: 2017-11-21
- Published: 2019-11-28
- Granted: 2022-09-13
- Earliest claimed: 2016-11-22
- Assignees: Sumitomo Electric Industries, Ltd.; Kyoto University
- Applicants: Sumitomo Electric Industries, Ltd.; Kyoto University
- Inventors: Tomoyuki Awazu; Masatoshi Majima; Yoshiki Nishibayashi; Toshiyuki Nohira; Kouji Yasuda; Kouji Hidaka
- Web page: https://patentgrep.com/patent/US11440799B2

## CPC

- C01B 32/05: Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
- C25B 1/135: Carbon
- C25B 1/14: Alkali metal compounds
- C25B 11/02: characterised by shape or form
- C25B 11/043: Carbon, e.g. diamond or graphene
- C01P 2002/82: by IR- or Raman-data
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A carbon material has at least either a peak related to diamond bonds, or a peak related to diamond-like bonds, appearing in a range of 1250 to 1400 cm−1 in a spectrum measured by Raman scattering spectrometry, and a full width at half maximum of a maximum peak, or each of full widths at half maximum of the maximum peak and a second largest peak, among peaks appearing in the range of 1250 to 1400 cm−1, has a signal less than 100 cm−1.

## Claims

### Claim 1

A method for manufacturing a carbon material, the method comprising the step of, in a state where a cathode having a roughened surface and an anode are disposed in a molten salt electrolytic solution containing carbonate ions and hydroxide ions in a molten salt, performing electrolytic reduction of the carbonate ions and the hydroxide ions contained in the molten salt electrolytic solution, to generate a carbon material on the cathode,
wherein the cathode having the roughened surface is a cathode having a surface roughened by diamond abrasive grains having a grain diameter of 20 nm to 5 μm or silicon carbide abrasive grains having a grain diameter of 20 nm to 5 μm,
wherein the carbon material has at least either a peak related to diamond bonds, or a peak related to diamond-like bonds, appearing in a range of 1250 to 1400 cm−1 in a spectrum measured by Raman scattering spectrometry, and
wherein a full width at half maximum of a maximum peak, or each of full widths at half maximum of the maximum peak and a second largest peak, among peaks appearing in the range of 1250 to 1400 cm−1, has a signal less than 100 cm−1.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the cathode having the roughened surface is the cathode having the surface roughened by diamond abrasive grains.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the molten salt is a molten salt containing at least one type of cation selected from the group consisting of alkali metal ions and alkaline earth metal ions, as a cation, and a halide anion as an anion.