Binder for battery, and anode and lithium battery including the same

Patent metadata

Field	Value
Publication number	US-9911979-B2
Application number	US-201414184454-A
Country	US
Kind code	B2
Filing date	Feb 19, 2014
Priority date	Feb 20, 2013
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A binder for a battery including polymethyl methacrylate particles and a binder polymer is disclosed. Additionally, a binder composition, and an anode and a lithium battery which include the binder are also disclosed.

First claim

What is claimed is:

1. An anode comprising:
an anode active material; and
a binder for a battery comprising
polymethyl methacrylate particles and
a binder polymer;
wherein the anode comprises the binder for the battery in which polymethyl methacrylate particles are dispersed;
wherein the anode active material comprises one or more selected from the group consisting of silicon (Si) and SiOx (0<x≦2);
wherein the binder for a battery has a form in which the polymethyl methacrylate particles are dispersed in the matrix; and
wherein the polymethyl methacrylate particles in the binder for the battery are crosslinked polymethyl methacrylate particles that do not have a glass transition temperature.

2. The anode of claim 1 , wherein an average particle diameter of the polymethyl methacrylate particles is in the range of about 10 nm to about 200 nm.

3. The anode of claim 1 , wherein the weight ratio of the polymethyl methacrylate particles to the binder polymer is in the range of about 100:10 to about 100:60.

4. The anode of claim 1 , wherein the binder for the battery has one or more glass transition temperatures.

5. The anode of claim 1 , wherein the binder for the battery has one or more glass transition temperatures of about 60° C. or less.

6. The anode of claim 1 , wherein the glass transition temperature of the binder for the battery is in the range of about −50° C. to about 60° C.

7. The anode of claim 1 , further comprising a coupling agent.

8. The anode of claim 7 , wherein the coupling agent is a silane-based compound.

9. The anode of claim 7 , wherein the coupling agent is a hydrolysate of a silane coupling agent.

10. The anode of claim 9 , wherein the silane coupling agent comprises one or more selected from the group consisting of an alkoxy group, a halogen group, an amino group, a vinyl group, a glycidoxy group, and a hydroxyl group.

11. The anode of claim 9 , wherein the silane coupling agent comprises one or more selected from the group consisting of vinylalkylalkoxysilane, epoxyalkylalkoxysilane, mercaptoalkylalkoxysilane, vinylhalosilane, and alkylacyloxysilane.

12. The anode of claim 1 , wherein the anode active material further comprises a carbon-based anode active material.

13. A lithium battery using the anode of claim 1 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Cha Jun Kyu
• Lee Beom Wook
• Chang Bum Jin
• Kim Myoung Sun

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525

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

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/1395

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

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title