Method of producing cellulose-nanofiber carbon

Patent metadata

Field	Value
Publication number	US-11319209-B2
Application number	US-201816636256-A
Country	US
Kind code	B2
Filing date	May 30, 2018
Priority date	Aug 4, 2017
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

Cellulose-nanofiber carbon which can achieve a large specific surface area, and a method of producing the same are provided. The method for heat treating a cellulose nanofiber for carbonization includes: a freezing step of freezing a solution or gel containing the cellulose nanofiber to obtain a frozen product a drying step of drying the frozen product in a vacuum to obtain a dried product and a carbonizing step of heating and carbonizing the dried product in an atmosphere which does not burn the dried product to obtain the cellulose-nanofiber carbon.

First claim

The invention claimed is:

1. A method of producing cellulose-nanofiber carbon by carbonizing a cellulose nanofiber, the method comprising:
a gel generating step of generating a bacterially produced gel by dispersing the cellulose nanofiber using bacteria;
a freezing step of freezing the gel containing the cellulose nanofiber to obtain a frozen product;
a drying step of drying the frozen product in a vacuum to obtain a dried product;
a carbonizing step of heating and carbonizing the dried product in an atmosphere which does not burn the dried product to obtain cellulose-nanofiber carbon;
a first milling step of milling the dried product carbonized in the carbonizing step;
a second milling step of milling the bacterially produced gel produced in the gel generating step; and
a mixing step of mixing materials milled in the first milling step and the second milling step.

2. The method of producing cellulose-nanofiber carbon according to claim 1 , further comprising:
an applying step of applying a mixture mixed in the mixing step to form a preferred shape; and
a drying step of removing liquid from the mixture.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Nohara Masaya
• Sakamoto Shuhei
• Iwata Mikayo
• Hayashi Masahiko
• Komatsu Takeshi

Classifications

• C01B32/336

  characterised by gaseous activating agents · CPC title

• C01P2004/16

  Nanowires or nanorods, i.e. solid nanofibres with two nearly equal dimensions between 1-100 nanometer · CPC title

• C01B32/00 Primary

  Carbon; Compounds thereof (C01B21/00, C01B23/00 take precedence; percarbonates C01B15/10; carbon black C09C1/48) · CPC title

• D01F9/16

  from products of vegetable origin or derivatives thereof, e.g. from cellulose acetate (D01F9/18 takes precedence) · CPC title

• C01B32/15 Primary

  Nano-sized carbon materials · CPC title