Negative electrode for lithium secondary battery and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9845522-B2
Application number	US-201314010337-A
Country	US
Kind code	B2
Filing date	Aug 26, 2013
Priority date	Oct 26, 2012
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

In an aspect, a negative electrode for a lithium secondary battery and a method of manufacturing the same is provided. The negative electrode for the lithium secondary battery includes a negative active material layer.

First claim

What is claimed is:

1. A negative electrode for a lithium secondary battery, the negative electrode comprising:
a current collector; and
a negative active material layer, wherein the negative active material layer comprises:
a metal matrix in a particulate form wherein the metal matrix is Si—Ti—Ni alloy;
silicon nanoparticles embedded in the metal matrix; and
a metal nitride and a silicon nitride that are located on at least a portion of a surface of the metal matrix,
wherein the metal nitride is Ti x N y O (0<x≦1, 0<y≦1) and the silicon nitride is Si x N y O (0<x≦1, 0<y≦1).

2. A method of preparing a negative electrode for a lithium secondary battery, the method comprising:
providing a current collector;
providing a negative active material precursor comprising silicon and at least one metal that does not react with lithium;
nitridating the negative active material precursor to prepare a negative active material in a particulate form, wherein the negative active material precursor is formed of nanoparticles comprising silicon, titanium, and nickel;
preparing a slurry for a negative electrode by mixing the negative active material with a conductor and a binder; and
coating the slurry for the negative electrode on the current collector to form a negative active material layer,
wherein the negative active material layer comprises:
a metal matrix in a particulate form wherein the metal matrix is Si—Ti—Ni alloy;
silicon nanoparticles embedded in the metal matrix; and
a metal nitride and a silicon nitride that are located on at least a portion of a surface of the metal matrix,

wherein the metal nitride is Ti x N y O (0<x≦1, 0<y≦1) and the silicon nitride is Si x N y O (0<x≦1, 0<y≦1).

3. The method of claim 2 , wherein the nitridating the negative active material precursor is performed by using chemical vacuum deposition.

4. The method of claim 2 , wherein the nitridating of the negative active material precursor is processed at a temperature of about 400° C. to about 800° C.

5. The method of claim 2 , wherein a gas used in the nitridating the negative active material precursor comprises a NH 3 gas, a N 2 gas or a combination thereof.

6. The method of claim 5 , wherein the gas further comprises a mixture gas comprising an inert gas mixed with a NH 3 gas, a N 2 gas or a combination thereof.

7. A negative electrode for a lithium secondary battery, the negative electrode comprising:
a current collector; and
a negative active material layer, wherein the negative active material layer comprises:
a metal matrix in a particulate form wherein the metal matrix is Si—Ti—Ni alloy;
silicon nanoparticles embedded in the metal matrix; and
a metal nitride and a silicon nitride that are located on at least a portion of a surface of the metal matrix,

wherein the metal nitride is a mixture of Ti x N y O (0<x≦1, 0<y≦1) and Ni x N y O (0<x≦1, 0<y≦1), and the silicon nitride is Si x N y O (0<x≦1, 0<y≦1).

8. A method of preparing a negative electrode for a lithium secondary battery, the method comprising:
providing a current collector;
providing a negative active material precursor comprising silicon and at least one metal that does not react with lithium;
nitridating the negative active material precursor to prepare a negative active material in a particulate form, wherein the negative active material precursor is formed of nanoparticles comprising silicon, titanium, and nickel;
preparing a slurry for a negative electrode by mixing the negative active material with a conductor and a binder; and
coating the slurry for the negative electrode on the current collector to form a negative active material layer,
wherein the negative active material layer comprises:
a metal matrix in a particulate form wherein the metal matrix is Si—Ti—Ni alloy;
silicon nanoparticles embedded in the metal matrix; and
a metal nitride and a silicon nitride that are located on at least a portion of a surface of the metal matrix,

wherein the metal nitride is a mixture of Ti x N y O (0<x≦1, 0<y≦1) and Ni x N y O (0<x≦1, 0<y≦1), and the silicon nitride is Si x N y O (0<x≦1, 0<y≦1).

Assignees

• Samsung Sdi Co Ltd
• Industry-Univ Cooperation Foundation Hanyang Univ (Iucf-Hyu)

Inventors

• Paik Un-Gyu
• Song Tae-Seup
• Kil Ki-Chun
• Chung Byung-Joo
• Shin Woo-Cheol

Classifications

• B22F1/054

  Nanosized particles · CPC title

• B22F2201/02

  Nitrogen · CPC title

• H01M4/1397

  of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• C22C32/0068

  only nitrides · CPC title

• C22C29/16 Primary

  based on nitrides {(containing cubic BN or wurtzitic BN and diamond C22C26/00)} · CPC title