Composite for anode active material and method of preparing the same

• US 10,290,860 B2
• Filed: 01/19/2017
• Issued: 05/14/2019
• 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:
  US15/409,750
• Publication Number:
  US 20170133663A1
• Time in Patent Office: 845 Days
• 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. A method of preparing an anode slurry, the method comprising:

preparing a mixed solution by mixing a conductive agent for a composite, a polymer, and a core oxide in a solvent;

performing a heat treatment after spray drying the mixed solution to prepare the composite for an anode active material, and

mixing the anode active material, a conductive agent for an anode slurry, a binder and a natural graphite to prepare the anode slurry,

wherein the core oxide comprises any one oxide selected from the group consisting of metal oxide, semi metal oxide and a mixture thereof,

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

the amorphous carbon layer forms a matrix and the conductive agent for the composite is dispersed as a filler in the matrix.

2. The method of claim 1, wherein the polymer comprises one or more selected from the group consisting of carboxymethyl cellulose (CMC), sucrose, polyacrylonitrile (PAN), and polyvinyl alcohol (PVA).

3. The method 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.

4. The method of claim 1, wherein a viscosity of the solution comprising the conductive agent for the composite, the polymer, and the core oxide is 1,000 cps or less.

5. The method of claim 1, wherein the spray drying is performed by injecting the mixed solution at a rate of 15 cc/min to 25 cc/min and an inlet temperature in a drying chamber of a spray dryer of 200°

C. to 250°

C.

6. The method of claim 1, wherein the heat treatment is performed at a temperature ranging from 600°

C. to 100°

C.