# US 2014/0154576 A1 · Composite for anode active material and method of preparing the same

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- Number: US 2014/0154576 A1
- Document ID: US20140154576A1
- Status: Published application
- Kind: A1
- Application number: 14/166,943
- Filed: 2014-01-29
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Yoon Ah Kang; Yong Ju Lee; Rae Hwan Jo; Je Young Kim
- Web page: https://patentgrep.com/patent/US20140154576A1

## CPC

- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/366: {as layered products}
- H01M 4/48: of inorganic oxides or hydroxides
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/623: {fluorinated polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 10/0427: {Button cells}
- H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0563: Liquid materials, e.g. for Li-SOCl2 cells
- H01M 10/0569: characterised by the solvents
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- H01M 10/052: Li-accumulators
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- H01M 2300/002: Inorganic electrolyte
- H01M 2300/0037: Mixture of solvents
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y10S 977/742: Carbon nanotubes, CNTs
- Y10S 977/753: with polymeric or organic binder
- Y10S 977/842: for carbon nanotubes or fullerenes
- Y10S 977/948: Energy storage/generating using nanostructure, e.g. fuel cell, battery
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## 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

### Claim 1

A composite for an anode active material comprising:
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

### Claim 2 (depends on 1)

The composite for an anode active material of claim 1, wherein the (semi) metal oxide comprises one or more selected from the group consisting of SiOx, AlOx, SnOx, SbOx, BiOx, AsOx, GeOx, PbOx, ZnOx, CdOx, InOx, TiOx, and GaOx,
where 0<x<2.

### Claim 3 (depends on 1)

The composite for an anode active material of claim 1, wherein the conductive agent is selected from the group consisting of a line-type conductive agent, a point-type conductive agent, and a mixture thereof.

### Claim 4 (depends on 3)

The composite for an anode active material of claim 3, wherein the line-type conductive agent comprises one or more selected from the group consisting of carbon nanotubes, carbon nanofibers, and graphene.

### Claim 5 (depends on 3)

The composite for an anode active material of claim 3, wherein the point-type conductive agent comprises one or more selected from the group consisting of carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and thermal black.

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

The composite for an anode active material of claim 1, wherein an amount of the conductive agent is in a range of 1 wt % to 20 wt % based on a total weight of the (semi) metal oxide.

### Claim 8 (depends on 1)

The composite for an anode active material of claim 1, wherein the composite for an anode active material has a structure, in which the amorphous carbon layer forms a matrix and the conductive agent is included as a filler in the matrix.

### Claim 9 (depends on 1)

The composite for an anode active material 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 (semi) metal oxide.

### Claim 10 (depends on 1)

The composite for an anode active material of claim 1, wherein the entire or partial surface of the (semi) metal oxide is coated with the amorphous carbon layer.

### Claim 11 (depends on 1)

The composite for an anode active material of claim 1, wherein a thickness of the amorphous carbon layer is in a range of 5 nm to 70 nm.

### Claim 12

A method of preparing a composite for an anode active material, the method comprising:
preparing a mixed solution by mixing a conductive agent, a polymer, and a (semi) metal oxide in a solvent; and
performing a heat treatment after spray drying the mixed solution.

### Claim 13 (depends on 12)

The method of claim 12, wherein the polymer comprises one or more selected from the group consisting of carboxymethyl cellulose (CMC), sucrose, polyacrylonitrile (PAN), and polyvinyl alcohol (PVA).

### Claim 14 (depends on 12)

The method of claim 12, wherein an amount of the conductive agent is in a range of 1 wt % to 20 wt % based on a total weight of the (semi) metal oxide.

### Claim 15 (depends on 12)

The method of claim 12, wherein a viscosity of the solution comprising the conductive agent, the polymer, and the (semi) metal oxide is 1,000 cps or less.

### Claim 16 (depends on 12)

The method of claim 12, wherein the spraying 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.

### Claim 17 (depends on 12)

The method of claim 12, wherein the heat treatment is performed at a temperature ranging from 600° C. to 1200° C.

### Claim 18 (depends on 1)

A secondary battery comprising:
a cathode including a cathode active material;
a separator;
an anode including the composite for an anode active material of claim 1; and
an electrolyte.