# US 10,483,589 B2 · Lithium-ion secondary battery

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- Number: US 10,483,589 B2
- Document ID: US10483589B2
- Status: Granted
- Kind: B2
- Application number: 15/279,980
- Filed: 2016-09-29
- Published: 2017-08-17
- Granted: 2019-11-19
- Earliest claimed: 2016-02-12
- Assignees: Sumitomo Osaka Cement Co., Ltd.
- Applicants: Sumitomo Osaka Cement Co., Ltd
- Inventors: Kouji Oono; Takao Kitagawa
- Web page: https://patentgrep.com/patent/US10483589B2

## CPC

- H01M 10/0567: characterised by the additives
- H01M 4/366: {as layered products}
- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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 lithium-ion secondary battery of the present invention includes a cathode including an electrode material having electrode active material particles and an oxide coat and a carbonaceous film which coat surfaces of the electrode active material particles, an anode including a carbon-based active material, and an electrolytic solution, and the electrolytic solution does not substantially include additives for stabilizing a coat formed on a surface of the anode.

## Claims

### Claim 1

A lithium-ion secondary battery comprising:
a cathode comprising an electrode material, the electrode material comprising
electrode active material particles represented by a formula:
LixAyDzPO4
in which A represents at least one selected from the group consisting of Co, Mn, Ni, Fe, Cu, and Cr, D represents at least one selected from the group consisting of Mg, Ca, S, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, Sc, Y, and rare earth elements, 0<x<2, 0<y<1.5, and 0≤z<1.5, and
a combination of an oxide coat and a carbonaceous film, which coats surfaces of the electrode active material particles so that islands formed of the oxide coat are present in a sea formed of the carbonaceous film on the surfaces of the electrode active material particle; an anode comprising a carbon-based active material; and an electrolytic solution;
and wherein the electrolytic solution comprises 0.1% by mass or less of additives for stabilizing a coating formed on a surface of the anode.

### Claim 2 (depends on 1)

The lithium-ion secondary battery according to claim 1,
wherein the oxide coat comprises at least one selected from the group consisting of: Al2O3, ZrO2, SiO2, and TiO2.

### Claim 3 (depends on 1)

The lithium-ion secondary battery according to claim 1,
wherein a content of the oxide coat is 0.1 parts by mass or more and 2 parts by mass or less with respect to 100 parts by mass of the electrode active material particles in the electrode material.

### Claim 4 (depends on 1)

The lithium-ion secondary battery according to claim 1,
wherein the electrode active material particles are LiFePO4 particles.

### Claim 5 (depends on 1)

The lithium-ion secondary battery according to claim 1,
wherein the additive is vinylene carbonate.

### Claim 6 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein the oxide coat is preferably 0.1 parts by mass or more and 2 parts by mass or less with respect to 100 parts by mass of the electrode active material particles.

### Claim 7 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein the carbonaceous film is disposed uniformly on all of the surfaces of the electrode active material particles.

### Claim 8 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein the carbonaceous film is preferably 0.5 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the electrode active material particles.

### Claim 9 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein the amount of oxide in the carbonaceous film 25% to 50% by mass.

### Claim 10 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein the lithium-ion secondary battery has a discharge capacity between 115 and 126 mAh/g.

### Claim 11 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein
the electrode material is formed by the method comprising:
preparing a slurry by mixing
at least one electrode active material particle raw material selected from the group consisting of electrode active material particles and precursors of the electrode active material particles,
an oxide coat precursor,
a carbonaceous film precursor, and
water together,
drying the slurry, and
calcinating the obtained dried slurry.

### Claim 12 (depends on 11)

The lithium-ion secondary battery according to claim 11, wherein the calcinating step is performed such that the slurry is sprayed and dried in the atmosphere of 70° C. or higher and 250° C. or lower, and then the obtained dried substance is calcinated in a non-oxidative atmosphere at a temperature in a range of 500 to 1,000° C.

### Claim 13 (depends on 1)

The lithium-ion secondary battery according to claim 1, wherein the electrode material is a sprayed and calcined material.