# US 11,444,282 B2 · Positive electrode material for lithium ion secondary battery, positive electrode for lithium ion secondary battery, and lithium ion secondary battery

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- Number: US 11,444,282 B2
- Document ID: US11444282B2
- Status: Granted
- Kind: B2
- Application number: 17/030,899
- Filed: 2020-09-24
- Published: 2021-09-30
- Granted: 2022-09-13
- Earliest claimed: 2020-03-30
- Assignees: Sumitomo Metal Mining Co., Ltd.
- Applicants: Sumitomo Osaka Cement Co., Ltd.
- Inventors: Tsutomu Nozoe; Toyomasa Nakano
- Web page: https://patentgrep.com/patent/US11444282B2

## CPC

- H01M 4/587: for inserting or intercalating light metals
- C01B 25/45: containing plural metal, or metal and ammonium
- 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 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- 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

## Abstract

A positive electrode material for a lithium ion secondary battery containing carbon, in which, when a peak of the carbon that is measured by Raman scattering and is present at 2200 to 3400 cm−1 is peak-separated into peaks including five types of Voigt functions of a peak 1 having a peak top present at 2200 to 2380 cm−1, a peak 2 having a peak top present at 2400 to 2550 cm−1, a peak 3 having a peak top present at 2600 to 2750 cm−1, a peak 4 having a peak top present at 2850 to 2950 cm−1, and a peak 5 having a peak top present at 3100 to 3250 cm−1, an average of proportions of Gaussian functions in the peak 3 and the peak 4 is 90% or more and less than 100%.

## Claims

### Claim 1

A positive electrode material for a lithium ion secondary battery comprising:
carbon,
wherein, when a peak of the carbon that is measured by Raman scattering and is present at 2200 to 3400 cm−1 is peak-separated into peaks including five types of Voigt functions of
a peak 1 having a peak top present at 2200 to 2380 cm−1,
a peak 2 having a peak top present at 2400 to 2550 cm−1,
a peak 3 having a peak top present at 2600 to 2750 cm−1,
a peak 4 having a peak top present at 2850 to 2950 cm−1, and
a peak 5 having a peak top present at 3100 to 3250 cm−1,
an average of proportions of Gaussian functions in the peak 3 and the peak 4 is 90% or more and less than 100%.

### Claim 2 (depends on 1)

The positive electrode material for a lithium ion secondary battery according to claim 1,
wherein, in the peak separation, a coefficient of determination with the measured peak of Raman scattering of carbon is 0.998 or more.

### Claim 3 (depends on 1)

The positive electrode material for a lithium ion secondary battery according to claim 1,
wherein, in the peak separation, an intensity of the peak top of the peak 4 is a highest, a full width at half maximum of the peak 3 is 150 cm−1 or more and 330 cm−1 or less, and a full width at half maximum of the peak 4 is 280 cm−1 or more and 360 cm−1 or less.

### Claim 4 (depends on 1)

The positive electrode material for a lithium ion secondary battery according to claim 1, further comprising:
an active material including an olivine-structured primary particle coated with a carbonaceous film containing the carbon or a granulated body thereof,
wherein an amount of the carbon is 0.5% by mass or more and 7% by mass or less.

### Claim 5 (depends on 1)

The positive electrode material for a lithium ion secondary battery according to claim 1,
wherein a crystallite diameter analyzed by X-ray diffraction is 50 nm or more and 250 nm or less.

### Claim 6 (depends on 1)

A positive electrode for a lithium ion secondary battery comprising:
an electrode current collector; and
a positive electrode mixture layer formed on the electrode current collector,
wherein the positive electrode mixture layer contains the positive electrode material for a lithium ion secondary battery according to claim 1.

### Claim 7 (depends on 6)

A lithium ion secondary battery comprising:
a positive electrode;
a negative electrode; and
a non-aqueous electrolyte,
wherein the positive electrode for a lithium ion secondary battery according to claim 6 is provided as the positive electrode.