Negative electrode, negative active material, method of preparing the negative electrode, and lithium battery including the negative electrode

Patent metadata

Field	Value
Publication number	US-2016149222-A1
Application number	US-201615004915-A
Country	US
Kind code	A1
Filing date	Jan 23, 2016
Priority date	Jan 17, 2011
Publication date	May 26, 2016
Grant date	—

Abstract

A negative electrode including: a current collector; a negative active material layer formed on the current collector; and a polymer coating layer that is formed on the negative active material layer and comprises a fluorinated acrylate type polymer.

First claim

What is claimed is:

1 . A negative active material comprising:
a core that intercalates or deintercalates lithium, and a coating layer formed on at least a portion of the core, wherein the core comprises at least one material selected from the group consisting of a carbonaceous negative active material and a metal-based negative active material, and the coating layer comprises a fluorinated acrylate type polymer.

2 . The negative active material of claim 1 , wherein the fluorinated acrylate type polymer is a repeating unit represented by Formula 1 below:

wherein:
R 1 to R 3 are each independently a hydrogen atom, a fluorine atom, a C 1 to C 20 alkyl group, a fluorine atom-substituted C 1 to C 20 alkyl group, a C 2 to C 20 alkenyl group, a fluorine atom-substituted C 2 to C 20 alkenyl group, a C 6 to C 20 aryl group, or a fluorine atom-substituted C 6 to C 20 aryl group,
R 4 to R 6 are each independently a hydrogen atom, a fluorine atom, CH 3 , CHF 2 , CH 2 F, or CF 3 ,
X is CH 2 , CHF, or CF 2 ,
a is an integer of 0 to 10, and b is an integer of 0 to 10,
the weight average molecular weight of the fluorinated acrylate type polymer is in the range of about 200 to about 500,000, and
any one of R 1 to R 6 comprises at least one fluorine atom.

3 . The negative active material of claim 1 , wherein the fluorinated acrylate type polymer is at least one material selected from the group consisting of poly(2,2,2-trifluoroethyl (meth)acrylate), poly(2,2,3,3-tetrafluoropropyl(meth)acrylate), poly(2,2,3,3,3-pentafluoropropyl (meth)acrylate), poly(2,2,3,4,4,4-hexafluorobutyl(meth)acrylate), poly(2,2,3,3,4,4,4-heptafluorobutyl(meth)acrylate), poly(2,2,3,3,4,4,5,5-octafluoropentyl(meth)acrylate), poly(3,3,4,4,5,5,6,6,6-nonafluorohexyl(meth)acrylate), and poly(1,1,1,3,3,3-hexafluoroisopropyl (meth)acrylate).

4 . The negative active material of claim 1 , wherein the fluorinated acrylate type polymer further comprises a repeating unit represented by Formula 2 below:

wherein R 7 is H, or CH 3 , and R 8 is a linear or branched C 1 to C 9 alkyl group, and
the weight average molecular weight of the fluorinated acrylate type polymer is about 200 to about 500,000.

5 . A lithium battery comprising:
a positive electrode; the negative electrode comprising the negative active material of claim 1 ; and an electrolyte.

6 . The lithium battery of claim 5 , further comprising a separator disposed between the positive electrode and the negative electrode.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Gue-Sung
• Kwon Moon-Seok
• Kim Han-Su

Classifications

• H01M4/133 Primary

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

• H01M4/0416 Primary

  involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence) · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/623

  fluorinated polymers · CPC title

• C08F220/00

  Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof · CPC title