Electrode for lithium secondary battery, method of manufacturing the electrode, and lithium secondary battery including the electrode

Patent metadata

Field	Value
Publication number	US-9716264-B2
Application number	US-201213593468-A
Country	US
Kind code	B2
Filing date	Aug 23, 2012
Priority date	Feb 21, 2012
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

An electrode for a lithium secondary battery includes a silicon-based alloy, and has a surface roughness of about 1 to about 10 μm and a surface roughness deviation of 5 μm or less. A method of manufacturing the electrode includes mixing an electrode composition, milling the composition, coating the milled composition on a current collector, and drying the milled composition. A lithium secondary battery includes the electrode.

First claim

What is claimed is:

1. An electrode for a lithium secondary battery, comprising an electrode active material comprising a silicon-based alloy, the electrode having a surface roughness of about 1 to about 10 μm and a surface roughness deviation of about 5 μm or less, the electrode having a mixed density of about 0.80 to about 0.90 g/cc, and the silicon-based alloy comprising an alloy selected from the group consisting of Si 68 Al 8 Ni 24 , Si 62 Ti 20 Ni 20 , Si 65 Ti 17.5 Ni 17.5 , and Si 68 Ti 16 Ni 16 .

2. The electrode of claim 1 , wherein the surface roughness deviation is about 2 μm or less.

3. The electrode of claim 1 , wherein the electrode active material is a negative electrode active material, and the electrode is a negative electrode.

4. The electrode of claim 3 , wherein the electrode active material further comprises a second material selected from the group consisting of carbonaceous materials, lithium metal, lithium alloys, silicon-oxide based materials, and combinations thereof.

5. The electrode of claim 4 , wherein an amount of the second material is about 1 to about 99 parts by weight based on 100 parts by weight of the silicon-based alloy and the second material.

6. A lithium secondary battery, comprising:
a first electrode comprising the electrode of claim 1 ;
a second electrode; and
an electrolyte.

Assignees

• Suh Soon-Sung
• Moon Sung-Hwan
• Matulevich Yury
• Kwon Seung-Uk
• Park Yo-Han
• Jeong Chang-Ui
• Kim Jae-Hyuk
• Lee Chun-Gyoo
• Choi Jong-Seo
• Samsung Sdi Co Ltd

Inventors

• Suh Soon-Sung
• Moon Sung-Hwan
• Matulevich Yury
• Kwon Seung-Uk
• Park Yo-Han
• Jeong Chang-Ui
• Kim Jae-Hyuk
• Lee Chun-Gyoo
• Choi Jong-Seo

Classifications

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

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

• H01M4/1395 Primary

  of electrodes based on metals, Si or alloys · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title