Method for Producing Lithium Oxide Coated with Carbon and Lithium Oxide Coated with Carbon

Patent metadata

Field	Value
Publication number	US-2023163288-A1
Application number	US-202017922272-A
Country	US
Kind code	A1
Filing date	May 21, 2020
Priority date	May 21, 2020
Publication date	May 25, 2023
Grant date	—

Abstract

A lithium oxide coated with carbon, wherein the carbon contains co-continuous fibrous carbon having a three-dimensional network structure in which carbon is branched.

First claim

1 . A carbon-coated lithium oxide, being a lithium oxide coated with carbon, wherein said carbon contains co-continuous fibrous carbon having a three-dimensional network structure in which carbon is branched.

2 . The carbon-coated lithium oxide of claim 1 , wherein said co-continuous fibrous carbon has a fiber diameter from 10 nm to 200 nm, a fiber length from 300 nm to 2 μm, and a secondary particle size from 1 μm to 50 μm.

3 . A method for producing a carbon-coated lithium oxide, the method comprising:
a pulverization step of pulverizing co-continuous fibrous carbon having a three-dimensional network structure in which carbon is branched; and a mixing step of mixing said pulverized co-continuous fibrous carbon and a lithium oxide.

4 . The method for producing a carbon-coated lithium oxide of claim 3 , wherein in said pulverization step a planetary ball mill is used, and a revolution speed of said planetary ball mill lies in the range from 100 rpm to 500 rpm.

5 . The method for producing a carbon-coated lithium oxide of claim 3 , wherein said mixing step includes:
a first step of obtaining a mixture by mixing said pulverized co-continuous fibrous carbon, said lithium oxide, and an organic solvent; and a second step of removing the solvent in said mixture, to obtain a lithium oxide coated with carbon.

6 . The method for producing a carbon-coated lithium oxide of claim 3 , wherein said pulverization step and said mixing step are carried out in an inert gas.

7 . The method for producing a carbon-coated lithium oxide of claim 4 , wherein said mixing step includes:
a first step of obtaining a mixture by mixing said pulverized co-continuous fibrous carbon, said lithium oxide, and an organic solvent; and a second step of removing the solvent in said mixture, to obtain a lithium oxide coated with carbon.

8 . The method for producing a carbon-coated lithium oxide of claim 4 , wherein said pulverization step and said mixing step are carried out in an inert gas.

9 . The method for producing a carbon-coated lithium oxide of claim 5 , wherein said pulverization step and said mixing step are carried out in an inert gas.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Kono Akihiro
• Minowa Hironobu
• Nohara Masaya
• Komatsu Takeshi

Classifications

• H01M4/483 Primary

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

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

• C01B25/45

  containing plural metal, or metal and ammonium · CPC title