# US 8,785,045 B2 · Active material, electrode, battery, and method of manufacturing active material

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- Number: US 8,785,045 B2
- Document ID: US8785045B2
- Status: Granted
- Kind: B2
- Application number: 12/108,244
- Filed: 2008-04-23
- Published: 2008-10-30
- Granted: 2014-07-22
- Earliest claimed: 2007-04-27
- Assignees: TDK Corporation
- Applicants: Tadashi Suzuki
- Inventors: Tadashi Suzuki
- Web page: https://patentgrep.com/patent/US8785045B2

## CPC

- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- 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 4/485: 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
- 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

An active material comprises a core particle containing LiCo(1-x)MxO2 and/or Li(Mn(1-y)My)2O4, and a coating part covering at least part of a surface of the core particle, while the coating part contains LiVOPO4. Here, M is at least one element selected from the group consisting of Al, Mg, and transition elements, 0.95≧x≧0, 0.2≧y≧0, and V in LiVOPO4 may partly be substituted by at least one element selected from the group consisting of Ti, Ni, Co, Mn, Fe, Zr, Cu, Zn, and Yb.

## Claims

### Claim 1

A positive active material comprising:
a core particle containing LiCo(1-x)MxO2; and
a coating part covering at least part of a surface of the core particle,
wherein:
the coating part contains LiV(1-a)MaOPO4,
M in the LiCo(1-x)MxO2 is at least one element selected from the group consisting of Al, Mg, Ti, Cr, Mn, Fe, Co, Ni, Cu, and Zn,
0≦x≦0.95,
M in the LiV(1-a)MaOPO4 may be at least one element selected from the group consisting of Ti, Ni, Co, Mn, Fe, Zr, Cu, Zn, and Yb, and
0≦a≦0.05.

### Claim 2 (depends on 1)

The positive active material according to claim 1, wherein the coating part has a thickness of 50 nm to 1 μm.

### Claim 3 (depends on 1)

A positive electrode comprising a current collector and an active material containing layer provided on the current collector, the active material containing layer comprising the positive active material of claim 1.

### Claim 4 (depends on 3)

A lithium ion secondary battery comprising the positive electrode of claim 3.

### Claim 5

A method of manufacturing a positive active material, the method comprising a step of causing at least part of a surface of a core particle containing LiCo(1-x)MxO2 to support LiV(1-a)MaOPO4,
wherein:
M in the LiCo(1-x)MxO2 is at least one element selected from the group consisting of Al, Mg, Ti, Cr, Mn, Fe, Co, Ni, Cu, and Zn,
0≦x≦0.95,
M in the LiV(1-a)MaOPO4 may be at least one element selected from the group consisting of Ti, Ni, Co, Mn, Fe, Zr, Cu, Zn, and Yb, and
0≦a≦0.05.

### Claim 6 (depends on 5)

The method of manufacturing a positive active material according to claim 5, wherein the core particle and an LiV(1-a)MaOPO4 particle are mixed in a fluidized bed.

### Claim 7 (depends on 5)

The method of manufacturing a positive active material according to claim 5, further comprising mixing a solution containing a precursor of LiV(1-a)MaOPO4 and the core particle and then synthesizing LiVOPO4 in the solution.