Silicon-carbon composite material including layered carbon and silicon particles

Patent metadata

Field	Value
Publication number	US-9947921-B2
Application number	US-201615176164-A
Country	US
Kind code	B2
Filing date	Jun 8, 2016
Priority date	Jun 23, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A silicon-carbon composite material includes: layers of carbon material; and secondary particles of silicon held between the layers of the carbon material. Each of the secondary particles of silicon is an aggregate of primary particles of silicon. At least one of the primary particles of silicon has a diameter 3 nm or more. At least one of the secondary particles of silicon has a diameter of 50 nm or less.

First claim

What is claimed is:

1. A silicon-carbon composite material comprising:
layers of carbon material; and
secondary particles of silicon held between the layers of carbon material, each of the secondary particles of silicon being an aggregate of primary particles of silicon, at least one of the primary particles of silicon having a diameter of 3 nm or more, and
at least one of the secondary particles of silicon, which includes the at least one of the primary particles of silicon, having a diameter of 50 nm or less.

2. The silicon-carbon composite material according to claim 1 , wherein:
the diameter of the at least one of the primary particles of silicon is less than 20 nm; and
the diameter of the at least one of the secondary particles of silicon is 5 nm or more.

3. The silicon-carbon composite material according to claim 1 , wherein:
the primary particles of silicon have an average diameter of 3 nm or more; and
the secondary particles of silicon have an average diameter of 50 nm or less.

4. The silicon-carbon composite material according to claim 3 , wherein:
the average diameter of the primary particles of silicon is less than 20 nm; and
the average diameter of the secondary particles of silicon is 5 nm or more.

5. The silicon-carbon composite material according to claim 1 , further comprising amorphous carbon.

6. A lithium-ion battery comprising:
an anode that contains the silicon-carbon composite material according to claim 1 ;
a cathode; and
an electrolyte that contains a lithium salt.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kajita Susumu

Classifications

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/133

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

• H01M4/625

  Carbon or graphite · CPC title

• C01B33/00

  Silicon; Compounds thereof ({C01B6/00,} C01B21/00, C01B23/00 take precedence; persilicates C01B15/14; carbides C01B32/956) · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title