Anode for secondary battery and lithium secondary battery including same

Patent metadata

Field	Value
Publication number	US-9620780-B2
Application number	US-201414291921-A
Country	US
Kind code	B2
Filing date	May 30, 2014
Priority date	Jan 6, 2014
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

The present disclosure provides an anode for a secondary battery, including: an electrode current collector; a first coating layer formed on the electrode current collector and including an anode active material, a first nonaqueous binder and a conducting material; and a second coating layer formed on the first coating layer and including a second nonaqueous binder. Since the anode of the present disclosure can reduce volume change of the anode active material, a lithium secondary battery including same may have improved cycle characteristics.

First claim

The invention claimed is:

1. An anode for a secondary battery, comprising:
an electrode current collector;
a first coating layer formed on the electrode current collector and comprising an anode active material, a first nonaqueous binder and a conducting material; and
a second coating layer formed on the first coating layer and comprising a second nonaqueous binder,
wherein the first nonaqueous binder is one or more nonaqueous binder selected from a group consisting of polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), an acrylonitrile-containing binder (X-linking agent), polyvinyl chloride, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene and polypropylene,
wherein the second nonaqueous binder is one or more nonaqueous binder selected from a group consisting of polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), an acrylonitrile-containing binder (X-linking agent), polyvinyl chloride, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene and polypropylene,
wherein the second coating layer is coated on the first nonaqueous binder which is coated only at a point of contact areas of neighboring anode active material particles,
wherein the second coating layer is coated in an amount of 1-5 wt % based on the total weight of the electrode on which the first coating layer has been formed, and
wherein the second nonaqueous binder is different from the first nonaqueous binder.

2. The anode of claim 1 , wherein the second coating layer further comprises a conducting material.

3. A lithium secondary battery comprising the anode according to claim 1 , a cathode, an electrolyte and a separator.

Assignees

• Lg Chemical Ltd

Inventors

• Jeong Bong Hyun
• Choi Im Goo
• Lee Byoung Bae
• Kim Kyoung Hun
• Kim Jang Bae

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/623

  fluorinated polymers · CPC title

• H01M10/052

  Li-accumulators · CPC title