Anode active material for lithium secondary batteries

Patent metadata

Field	Value
Publication number	US-2016276654-A1
Application number	US-201615166820-A
Country	US
Kind code	A1
Filing date	May 27, 2016
Priority date	Dec 6, 2011
Publication date	Sep 22, 2016
Grant date	—

Abstract

Disclosed are an anode active material for lithium secondary batteries, the anode active material comprising: a core part including a carbon-silicon complex and having a cavity therein; and a coated layer which is formed on the surface of the core part and includes a phosphor-based alloy.

First claim

What is claimed is:

1 . An anode active material for a lithium secondary battery, comprising.
a core including a carbon-silicon composite and having a cavity formed inside; and a coating layer formed on a surface of the core and including a phosphorus (P)-based alloy wherein the coating layer entirely covers the surface of the core.

2 . The anode active material for the lithium secondary battery according to claim 1 , wherein the coating layer has a plurality of domains which are protruded from the coating layer surface.

3 . The anode active material for the lithium secondary battery according to claim 1 , wherein the phosphorus-based alloy is an alloy of phosphorous and a metal selected from the group consisting of Al, Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Pd, Ag, In, Sn, and W.

4 . The anode active material for the lithium secondary battery according to claim 1 , wherein the carbon-silicon composite further includes oxygen.

5 . The anode active material for the lithium secondary battery according to claim 1 , wherein a density of the coating layer is in a range of 1.2 to 5.8 g cm 3 , and a thickness of the coating layer including the domains is equal to or less than 0.1 μm.

6 . The anode active material for the lithium secondary battery according to claim 1 , wherein a specific surface area of the core is equal to or less than 50 m 2 /g.

7 . The anode active material for the lithium secondary battery according to claim 1 , wherein an average particle diameter of the core is in a range of 0.5 to 100 μm.

8 . An anode for a lithium secondary battery, the anode comprising:
a current collector; and an anode active material layer formed on at least one surface of the current collector and including an anode active material and binder, wherein the anode active material is an anode active material defined in claim 1 .

9 . An anode for a lithium secondary battery according to claim 8 ,
wherein the binder is polyimide.

10 . A lithium secondary battery comprising:
a cathode; an anode; and a separator interposed between the cathode and the anode, wherein the anode is an anode defined in claim 8 .

Assignees

• Lg Chemical Ltd

Inventors

• Woo Sang-Wook
• Kim Je-Young

Classifications

• B22F1/142

  Thermal or thermo-mechanical treatment · CPC title

• B22F1/18

  Non-metallic particles coated with metal · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/049

  Manufacturing of an active layer by chemical means · CPC title

• H01M10/0525

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