Negative active material for rechargeable lithium battery, method of preparing same, and rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-9005815-B2
Application number	US-94867210-A
Country	US
Kind code	B2
Filing date	Nov 17, 2010
Priority date	May 7, 2010
Publication date	Apr 14, 2015
Grant date	Apr 14, 2015

Abstract

A negative active material for a rechargeable lithium battery, a method of manufacturing the same, and a rechargeable lithium battery including the negative active material. The negative active material includes carbon particles having interplanar spacing (d002) ranging from about 0.34 nm to about 0.50 nm at a 002 plane, measured by X-ray diffraction using CuKα, and nitrogen on the surface of the carbon particles.

First claim

What is claimed is:

1. A negative active material for a rechargeable lithium battery, comprising:
carbon particles having interlayer spacing (d002) ranging from 0.34 nm to 0.35 nm at a 002 plane measured regarding X-ray diffraction using CuKα; and
nitrogen on the surface of the carbon particles;
wherein the surface includes the space from the surface of the carbon particles down to about a half radius from the center of the carbon particles;
wherein the nitrogen concentration ranges from about 0.1 to about 5 wt % based on the weight of the negative active material;
wherein the center of the carbon particles comprises no nitrogen; and
wherein the carbon particles comprise amorphous carbon and the carbon particles have a single amorphous structure both on the surface and in the center region.

2. A rechargeable lithium battery comprising:
a negative electrode comprising a negative active material having carbon particles with interlayer spacing (d002) ranging from 0.34 nm to 0.35 nm at a 002 plane, measured by X-ray diffraction using CuKα, and nitrogen on the surface of the carbon particles;
a positive electrode comprising a positive active material; and
a non-aqueous electrolyte;
wherein the surface includes the space from the surface of the carbon particles down to about a half radius from the center of the carbon particles;
wherein the nitrogen concentration ranges from about 0.1 to about 5 wt % based on the weight of the negative active material;
wherein the center of the carbon particles comprises no nitrogen; and
wherein the carbon particles have amorphous carbon and the carbon particles have a single amorphous structure both on the surface and in the center region.

3. The negative active material of claim 1 , wherein the surface of the negative active material extends about a half radius of the carbon particles.

4. The negative active material of claim 1 , wherein the carbon particles is amorphous throughout the surface and central region of the carbon particles.

Assignees

• Sheem Kyeu-Yoon
• Ka Bok-Hyun
• Han Da-Woon
• Samsung Sdi Co Ltd

Inventors

• Sheem Kyeu-Yoon
• Ka Bok-Hyun
• Han Da-Woon

Classifications

• H01M4/1393

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

• H01M4/587 Primary

  for inserting or intercalating light metals · CPC title

• H01M4/133

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

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• Y02E60/10

  Energy storage using batteries · CPC title