# US 8,771,875 B2 · Substance and battery including the same

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- Number: US 8,771,875 B2
- Document ID: US8771875B2
- Status: Granted
- Kind: B2
- Application number: 12/200,635
- Filed: 2008-08-28
- Published: 2009-03-12
- Granted: 2014-07-08
- Earliest claimed: 2007-09-12
- Assignees: Sony Corporation
- Applicants: Yoshinori Gamoh; Hiroshi Imoto
- Inventors: Yoshinori Gamoh; Hiroshi Imoto
- Web page: https://patentgrep.com/patent/US8771875B2

## CPC

- 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 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 10/052: Li-accumulators
- 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

A substance includes an oxide including at least one element selected from the group including cobalt Co, nickel Ni, manganese Mn, iron Fe, and copper Cu; and silicon Si chemically bonded to the surface of the oxide. Also, a battery includes a cathode, an anode, and an electrolyte, wherein the cathode includes an oxide including at least one selected from the group including cobalt Co, nickel Ni, manganese Mn, iron Fe, and copper Cu; and a substance including silicon Si chemically bonded to the surface of the oxide.

## Claims

### Claim 1

A cathode active material comprising:
oxide particles, the oxide including an element selected from the group consisting of cobalt, nickel, manganese, iron, and copper; and
silicon chemically bonded to a surface of said oxide particles,
wherein a bonding state of silicon on the surface of said oxide particles is M1-O—Si—R or M1-O—Si—O, wherein M1 represents the element included in the oxide and R represents a carbon chain or a carbon chain having a functional group,
wherein an element ratio of said silicon on the surface of said oxide particles is 3% or more and 90% or less, and
wherein the average particle size of the oxide particles is 0.005 μm or more and 0.5 μm or less.

### Claim 2 (depends on 1)

The cathode active material according to claim 1, wherein said oxide is cobalt oxide.

### Claim 3 (depends on 1)

The cathode active material according to claim 1, wherein said element included in said oxide is reduced to have a valence of 1 or less by electrochemical oxidation reduction reaction with lithium.

### Claim 4 (depends on 1)

The cathode active material according to claim 1, wherein said silicon is bonded in a state of SiO2.

### Claim 5 (depends on 1)

The cathode active material according to claim 1, wherein carbon is uniformly distributed on the surface of said oxide particles.

### Claim 6 (depends on 1)

The cathode active material according to claim 1, wherein the oxide is selected from the group consisting of CoO, FeO, CuO, NiO, Fe2O3, CO3O4, Li2CoO, NixMg6-xMnO8, LiNiVO4, Co2SnO4, and Mn3O4.

### Claim 7 (depends on 1)

The cathode active material according to claim 1, wherein the bonding state of silicon on the surface of said oxide particles is associated with a discharge capacity retention ratio of 93% or more.

### Claim 8 (depends on 1)

The cathode active material according to claim 1, wherein the bonding state of silicon on the surface of said oxide particles is associated with an initial discharge capacity of 761 mAh/g or more.

### Claim 9

A battery comprising a cathode, an anode, and an electrolyte, wherein said cathode includes a cathode active material comprising:
oxide particles, the oxide including an element selected from the group consisting of cobalt, nickel, manganese, iron, and copper; and
silicon chemically bonded to a surface of said oxide particles,
wherein a bonding state of silicon on the surface of said oxide particles is M1-O—Si—R or M1-O—Si—O, wherein M1 represents the element included in the oxide and R represents a carbon chain or a carbon chain having a functional group,
wherein an element ratio of said silicon on the surface of said oxide particles is 3% or more and 90% or less, and
wherein the average particle size of said oxide particles is 0.005 μm or more and 0.5 μm or less.

### Claim 10 (depends on 9)

The battery according to claim 9, wherein said oxide is cobalt oxide.

### Claim 11 (depends on 9)

The battery according to claim 9, wherein the element included in said oxide is reduced to have a valence of 1 or less by electrochemical oxidation reduction reaction with lithium.

### Claim 12 (depends on 9)

The battery according to claim 9, wherein said silicon is bonded in the state of SiO2.

### Claim 13 (depends on 9)

The battery according to claim 9, wherein carbon is uniformly distributed on the surface of said oxide particles.

### Claim 14 (depends on 9)

The battery according to claim 9, wherein the oxide is selected from the group consisting of CoO, FeO, CuO, NiO, Fe2O3, Co3O4, Li2CoO, NixMg6-xMnO8, LiNiVO4, Co2SnO4, and Mn3O4.

### Claim 15 (depends on 9)

The battery according to claim 9, wherein the bonding state of silicon on the surface of said oxide particles is associated with a discharge capacity retention ratio of 93% or more.

### Claim 16 (depends on 9)

The battery according to claim 9, wherein the bonding state of silicon on the surface of said oxide particles is associated with an initial discharge capacity of 761 mAh/g or more.