Anode for lithium secondary battery and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2017125788-A1
Application number	US-201715403678-A
Country	US
Kind code	A1
Filing date	Jan 11, 2017
Priority date	Jan 25, 2013
Publication date	May 4, 2017
Grant date	—

Abstract

Provided is an anode for a lithium secondary battery composed of a multi-layered structure including an electrode current collector, a first anode active material layer including a first anode active material formed on the electrode current collector, and a second anode active material layer including a second anode active material having relatively lower press density and relatively larger average particle diameter than the first anode active material.
Since an anode according to an embodiment of the present invention may include a multi-layered active material layer including two kinds of anode active materials having different press densities and average particle diameters on an electrode current collector, porosity of the surface of the electrode may be improved even after a press process to improve ion mobility into the electrode. Thus, charge characteristics and cycle life of a lithium secondary battery may be improved.

First claim

1 . A method of preparing an anode, the method comprising:
coating an electrode current collector with a first anode active material slurry including a first anode active material and a binder resin; forming a first anode active material layer by drying the first anode active material slurry; coating the first anode active material layer with a second anode active material slurry including a second anode active material and a binder resin; forming a second anode active material layer by drying the second anode active material slurry; and pressing the electrode current collector on which the first and second anode active material layers are formed.

2 . A method of preparing an anode, the method comprising:
coating an electrode current collector with a first anode active material slurry including a first anode active material and a binder resin; coating the first anode active material layer with a second anode active material slurry including a second anode active material and a binder resin; forming a multi-layered anode active material layer by drying the first and second anode active material slurries; and pressing the electrode current collector on which the multi-layered anode active material layer is formed.

3 . The method of claim 1 , wherein porosity of the second anode active material layer is relatively higher than porosity of the first anode active material layer.

4 . The method of claim 3 , wherein a ratio of the porosity of the first anode active material layer to the porosity of the second anode active material layer before press is in a range of 5:5.1 to 4:6.

5 . The method of claim 3 , wherein a ratio of the porosity of the first anode active material layer to the porosity of the second anode active material layer after press is in a range of 5:5.1 to 2:8.

Assignees

• Lg Chemical Ltd

Inventors

• Ahn Byoung Hoon
• Bae Joon Sung
• Koo Chang Wan

Classifications

• H01M2004/021

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

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M10/0525

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

• H01M4/366

  as layered products · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title