Composite for anode active material and method of preparing the same

• US 9,590,238 B2
• Filed: 01/29/2014
• Issued: 03/07/2017
• Est. Priority Date: 11/30/2012
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kang, Yoon Ah, Lee, Yong Ju, Jo, Rae Hwan, Kim, Je Young
• Primary Examiner(s): Walls, Cynthia K
• Application Number:
  US14/166,943
• Publication Number:
  US 20140154576A1
• Time in Patent Office: 1,133 Days
• US Class Current: 1/1
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: H01M 10/0427 Button cells
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0563 Liquid materials, e.g. for Li-SOCl2 cells
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 2300/002 Inorganic electrolyte
• CPC Class Codes: H01M 2300/0037 Mixture of solvents
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/0471 involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/1391 of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/48 of inorganic oxides or hydroxides
• CPC Class Codes: H01M 4/483 for non-aqueous cells H01M4/485 takes precedence
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 4/623 : fluorinated polymers
• CPC Class Codes: H01M 4/625 : Carbon or graphite
• CPC Class Codes: H01M 4/661 : Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10S 977/742 : Carbon nanotubes, CNTs
• CPC Class Codes: Y10S 977/753 : with polymeric or organic binder
• CPC Class Codes: Y10S 977/842 : for carbon nanotubes or fullerenes
• CPC Class Codes: Y10S 977/948 : Energy storage/generating using nanostructure, e.g. fuel cell, battery

Abstract

Provided are a composite for an anode active material and a method of preparing the same. More particularly, the present invention provides a composite for an anode active material including a (semi) metal oxide and an amorphous carbon layer on a surface of the (semi) metal oxide, wherein the amorphous carbon layer comprises a conductive agent, and a method of preparing the composite.

Claims

1. An anode slurry comprising:

i) a composite for an anode active material comprising a core consisting of a core oxide selected from the group consisting of metal oxide, semi metal oxide and a mixture thereof;

an amorphous carbon layer coated on a surface of the core oxide; and

a conductive agent for the composite dispersed in the amorphous carbon layer,

wherein the amorphous carbon layer forms a matrix and the conductive agent is dispersed as a filler in the matrix;

ii) a conductive agent for the anode slurry;

iii) a binder; and

iv) a natural graphite.

2. The anode slurry of claim 1, wherein the core oxide comprises one or more selected from the group consisting of SiO_x, AlO_x, SnO_x, SbO_x, BiO_x, AsO_x, GeO_x, PbO_x, ZnO_x, CdO,_x InO_x, TiO_x, and GaO_x,

where 0<

x<

2.

3. The anode slurry of claim 1, wherein the conductive agent for the composite is one or more selected from the group consisting of carbon nanotubes, carbon nanofibers, graphene, carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and thermal black.

4. The anode slurry of claim 1, wherein the conductive agent for the composite is selected from the group consisting of crystalline carbon, amorphous carbon, and a mixture thereof.

5. The anode slurry of claim 1, wherein an amount of the conductive agent for the composite is in a range of 1 wt % to 20 wt % based on a total weight of the core oxide.

6. The anode slurry of claim 1, wherein a carbon content of the amorphous carbon layer is 2 parts by weight to 30 parts by weight based on 100 parts by weight of the core oxide.

7. The anode slurry of claim 1, wherein the entire or partial surface of the core oxide is coated with the amorphous carbon layer.

8. The anode slurry of claim 1, wherein a thickness of the amorphous carbon layer is in a range of 5 nm to 70 nm.

9. A secondary battery comprising:

a cathode including a cathode active material;

a separator;

an anode prepared from the anode slurry of claim 1; and

an electrolyte.