Anode active material for lithium secondary batteries and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-9379380-B2
Application number	US-201414267189-A
Country	US
Kind code	B2
Filing date	May 1, 2014
Priority date	Dec 6, 2011
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

Disclosed are an anode active material for lithium secondary batteries and a method for manufacturing same, 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. A method of manufacturing an anode active material for the lithium secondary battery, the method comprising,
treating a silicon polymer particle with a metal chloride solution to prepare the silicon polymer particle with a metal catalyst supported on a surface;
dispersing the silicon polymer particle with the metal catalyst supported on the surface in a plating bath filled with a plating solution containing a metal ion for a phosphorous-based alloy and phosphoric acid;
heating the bath to form a phosphorous (P)-based alloy surface-coated silicon polymer particle; and
carbonizing the phosphorous (P)-based alloy surface-coated silicon polymer particle by heat treatment in a range of 800 to 1200° C. in a reducing atmosphere, thereby forming a core including a carbon-silicon composite and having a cavity formed inside.

2. The method of manufacturing the anode active material for the lithium secondary battery according to claim 1 , wherein the silicon polymer particle is polysiloxane, polysilane, and polycarbosilane.

3. The method of manufacturing the anode active material for the lithium secondary battery according to claim 1 , wherein the metal chloride solution is one that metal chloride selected from PdCl 2 , SnCl 2 , and CuCl 2 is dissolved in an aqueous solution of nitrohydrochloric acid or hydrochloric acid, or in a polar organic solvent of dimethylformamide (DMF), hexamethylphosphoramide (HMPA), dimethylacetamide (DMA) or dimethylsulfoxide (DMSO).

4. The method of manufacturing the anode active material for the lithium secondary battery according to claim 1 , wherein the metal ion for the phosphorous-based alloy is one type of ion selected from Ni 2+ , Cu 2+ , Ti 4+ ,Al 3+ ,Cr 2+ ,Cr 3+ ,Cr 6+ , Mn 2+ , Mn 3+ , Mn 4+ , Fe 2+ , Fe 3+ , Co 2+ , Co 3+ , Zn 2+ , Ga 3+ , Ge 4+ , As 4+ , Pd. 2+ , Ag + , In 2+ , In 3+ , Sn 2+ , and W 6+ , or mixtures thereof.

Assignees

• Lg Chemical Ltd

Inventors

• Woo Sang-Wook
• Kim Je-Young

Classifications

• B22F1/18

  Non-metallic particles coated with metal · CPC title

• B22F1/142

  Thermal or thermo-mechanical treatment · CPC title

• C23C18/30

  Activating {or accelerating or sensitising with palladium or other noble metal} · CPC title

• C23C18/36

  using hypophosphites · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title