# US 2014/0193708 A1 · Positive active material composition for rechargeable lithium battery, positive electrode prepared from composition, and rechargeable lithium battery including positive electrode

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- Number: US 2014/0193708 A1
- Document ID: US20140193708A1
- Status: Published application
- Kind: A1
- Application number: 13/888,175
- Filed: 2013-05-06
- Published: 2014-07-10
- Earliest claimed: 2013-01-04
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Seung-Hun Han; Myung-Duk Lim; Chae-Woong Cho
- Web page: https://patentgrep.com/patent/US20140193708A1

## CPC

- H01M 4/366: {as layered products}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/48: of inorganic oxides or hydroxides
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/602: {Polymers}
- H01M 4/622: {being polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 4/626: {Metals}
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/621: {Binders}
- H01M 4/623: {fluorinated polymers}
- H01M 4/624: {Electric conductive fillers}
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

In an aspect, a positive active material composition for a rechargeable lithium battery including a positive active material coated with a vanadium pentaoxide (V2O5) and an aqueous binder, a positive electrode including the same, and a rechargeable lithium battery including the positive electrode is disclosed.

## Claims

### Claim 1

A positive active material composition for a rechargeable lithium battery, comprising
a positive active material coated with vanadium pentaoxide (V2O5); and
an aqueous binder.

### Claim 2 (depends on 1)

The positive active material composition of claim 1, wherein the vanadium pentaoxide (V2O5) is coated on a surface of the positive active material in a form of an island.

### Claim 3 (depends on 1)

The positive active material composition of claim 1, wherein the vanadium pentaoxide (V2O5) is included in an amount of about 0.1 parts to about 5 parts by weight based on 100 parts by weight of the positive active material.

### Claim 4 (depends on 1)

The positive active material composition of claim 1, wherein the vanadium pentaoxide (V2O5) is included in an amount of about 0.1 parts to about 1 parts by weight based on 100 parts by weight of the positive active material.

### Claim 5 (depends on 1)

The positive active material composition of claim 1, wherein the positive active material comprises at least one selected from lithium cobalt-based oxide, lithium nickel cobalt manganese-based oxide, and lithium nickel cobalt aluminum-based oxide.

### Claim 6 (depends on 1)

The positive active material composition of claim 1, wherein the positive active material coated with vanadium pentaoxide is prepared by the method comprising:
mixing a positive active material, vanadium pentaoxide (V2O5) and an organic solvent,
agitating the mixture to evaporate an organic solvent, and
heating the resultant mixture after evaporating the organic solvent to prepare a positive active material coated with vanadium pentaoxide.

### Claim 7 (depends on 6)

The positive active material composition of claim 6, wherein the organic solvent is a carbonate-based, alcohol-based, ester-based, ether-based, ketone-based, or aromatic hydrocarbon-based solvent, an aprotic solvent, or a combination thereof.

### Claim 8 (depends on 6)

The positive active material composition of claim 6, wherein the resultant mixture after evaporating the organic solvent is heated in a range of from about 620° C. to about 730° C.

### Claim 9 (depends on 1)

The positive active material composition of claim 1, wherein the aqueous binder comprises at least one selected from carboxylmethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, polyvinylidene fluoride, polytetrafluoroethylene, polyethylene, polypropylene, polybutadiene, polyethyleneoxide, polyvinylalcohol, polyacrylic acid and a salt thereof, polyvinylpyrrolidone, polyepichlorohydrine, polyphosphazene, polyacrylonitrile, polystyrene, polyvinylpyridine, chlorosulfonated polyethylene, a polyester a resin, an acrylic resin, a phenolic resin, an epoxy resin, a polymer of propylene and C2 to C8 olefin, a copolymer of (meth)acrylic acid and (meth)acrylic acid alkylester, and a combination thereof.

### Claim 10 (depends on 1)

The positive active material composition of claim 1, wherein the aqueous binder is included in an amount of about 0.1 parts to about 10 parts by weight based on 100 parts by weight of the positive active material.

### Claim 11 (depends on 1)

The positive active material composition of claim 1, wherein the positive active material composition further comprises a conductive material.

### Claim 12 (depends on 11)

The positive active material composition of claim 11, wherein the conductive material comprises at least one selected from natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, a carbon fiber, a carbon nanotube, a metal powder, a metal fiber, and a conductive polymer.

### Claim 13 (depends on 5)

The positive active material composition of claim 5, wherein the lithium cobalt-based oxide is LiaA1-bRbD12 where A is Co and D1 is O (oxygen) (0.90≦a≦1.8 and 0≦b≦0.5).

### Claim 14 (depends on 5)

The positive active material composition of claim 5, wherein the lithium nickel cobalt manganese-based oxide is LiaNi1-b-cCobRcD1α where R is Mn and D1 is O (oxygen) (0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05 and 0≦α≦2).

### Claim 15 (depends on 14)

The positive active material composition of claim 14, wherein LiaNi1-b-cCobRcD1α is Li[Ni0.5Co0.2Mn0.3]O2.

### Claim 16 (depends on 5)

The positive active material composition of claim 5, wherein the lithium nickel cobalt aluminum-based oxide is LiaNi1-b-cCobRcD1α where R is Al and D1 is O (oxygen) (0.90≦a≦1.8, 0≦b≦0.5, 0≦c≦0.05 and 0≦α≦2).

### Claim 17 (depends on 1)

A positive electrode for a rechargeable lithium battery, comprising
a metal current collector; and
a positive active material layer formed on the metal current collector by using the positive active material composition of claim 1.

### Claim 18 (depends on 17)

The positive electrode for a rechargeable lithium battery of claim 17, wherein the metal current collector is aluminum.

### Claim 19 (depends on 17)

A rechargeable lithium battery, comprising
the positive electrode according to claim 17;
a negative electrode including a negative active material;
a separator interposed between the positive electrode and negative electrode; and
an electrolyte.