# US 2020/0403223 A1 · Positive electrode for lithium ion battery, lithium ion battery and method of producing positive electrode for lithium ion battery

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- Number: US 2020/0403223 A1
- Document ID: US20200403223A1
- Status: Published application
- Kind: A1
- Application number: 16/876,154
- Filed: 2020-05-18
- Published: 2020-12-24
- Earliest claimed: 2019-06-24
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Kazuhiro Araki; Taku Matsuzaka
- Web page: https://patentgrep.com/patent/US20200403223A1

## CPC

- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- C01B 25/42: Pyrophosphates
- C01B 25/455: containing halogen {(completely halogenated alkali metal phosphates C01D, e.g. lithium hexafluorophosphate C01D15/005)}
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/1397: of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/364: {as mixtures}
- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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
- 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

## Abstract

A positive electrode (21) includes a positive electrode current collector (21A), and a positive electrode mixture layer (21B) which is formed on the positive electrode current collector (21A) and contains a positive electrode active material. The positive electrode mixture layer (21B) includes a first positive electrode active material (21B-1) composed of LiVPO4F and a second positive electrode active material (21B-2) composed of LiVP2O7. In addition, a mixing ratio of the first positive electrode active material (21B-1) and the second positive electrode active material (21B-2) contained in the positive electrode mixture layer (21B) is represented by (1−x)LiVPO4F+xLiVP2O7 (x is a mass ratio, 0<x≤0.21).

## Claims

### Claim 1

A positive electrode for a lithium ion battery, comprising:
a positive electrode current collector and a positive electrode mixture layer formed on the positive electrode current collector,
wherein the positive electrode mixture layer contains a first positive electrode active material composed of LiVPO4F and a second positive electrode active material composed of LiVP2O7, and
wherein a mixing ratio of the first positive electrode active material and the second positive electrode active material contained in the positive electrode mixture layer is represented by (1−x)LiVPO4F+xLiVP2O7 (x is a mass ratio, 0<x≤0.21).

### Claim 2 (depends on 1)

The positive electrode for a lithium ion battery according to claim 1,
wherein the mass ratio satisfies 0.03≤x≤0.21.

### Claim 3 (depends on 1)

The positive electrode for a lithium ion battery according to claim 1,
wherein the mixing ratio of the first positive electrode active material and the second positive electrode active material in the positive electrode mixture layer is determined by Rietveld analysis of XRD patterns.

### Claim 4 (depends on 2)

The positive electrode for a lithium ion battery according to claim 2,
wherein the mixing ratio of the first positive electrode active material and the second positive electrode active material in the positive electrode mixture layer is determined by Rietveld analysis of XRD patterns.

### Claim 5 (depends on 1)

A lithium ion battery comprising the positive electrode for a lithium ion battery according to claim 1.

### Claim 6

A method of producing a positive electrode for a lithium ion battery, comprising
forming a positive electrode mixture layer containing a first positive electrode active material and a second positive electrode active material on a positive electrode current collector so that a mixing ratio of the first positive electrode active material composed of LiVPO4F and the second positive electrode active material composed of LiVP2O7 is represented by (1−x)LiVPO4F+xLiVP2O7 (x is a mass ratio, 0<x≤0.21).

### Claim 7 (depends on 6)

The method of producing a positive electrode for a lithium ion battery according to claim 6,
wherein the positive electrode mixture layer is formed on the positive electrode current collector so that the mass ratio satisfies 0.03≤x≤0.21.

### Claim 8 (depends on 6)

The method of producing a positive electrode for a lithium ion battery according to claim 6,
wherein the mixing ratio of the first positive electrode active material and the second positive electrode active material in the positive electrode mixture layer is determined by Rietveld analysis of XRD patterns.

### Claim 9 (depends on 7)

The method of producing a positive electrode for a lithium ion battery according to claim 7,
wherein the mixing ratio of the first positive electrode active material and the second positive electrode active material in the positive electrode mixture layer is determined by Rietveld analysis of XRD patterns.

### Claim 10 (depends on 6)

The method of producing a positive electrode for a lithium ion battery according to claim 6, comprising:
a mixing process in which LiF, PTFE, stearic acid, a vanadium compound and an ammonium phosphate compound are mixed;
a drying process in which the mixture obtained in the mixing process is dried;
a pulverizing process in which the dried product obtained in the drying process is pulverized; and
a firing process in which the pulverized product obtained in the pulverizing process is fired to obtain a positive electrode active material composed of the first positive electrode active material and the second positive electrode active material.

### Claim 11 (depends on 6)

The method of producing a positive electrode for a lithium ion battery according to claim 6, comprising:
a mixing process (A) in which LiF, PTFE, stearic acid, vanadium oxide having a particle size distribution of less than 200 μm and an ammonium phosphate compound are mixed;
a drying process (B) in which the mixture obtained in the mixing process (A) is dried;
a pulverizing process (C) in which the dried product obtained in the drying process (B) is pulverized 120 times over 30 seconds;
a firing process (D) in which the pulverized product obtained in the pulverizing process (C) is fired to obtain the first positive electrode active material;
a mixing process (E) in which citric acid and phosphoric acid are mixed into a solution in which vanadium oxide is dissolved;
a drying process (F) in which the mixture obtained in the mixing process (E) is dried;
a firing process (G) in which the dried product obtained in the drying process (F) is fired;
a pulverizing process (H) in which lithium carbonate and citric acid are added to the fired product obtained in the firing process (G) and the mixture is pulverized and mixed;
a pre-firing process (I) in which the pulverized product obtained in the pulverizing process (H) is pre-fired;
a main firing process (J) in which the fired product obtained in the pre-firing process (I) is main-fired to obtain a second positive electrode active material; and
a mixing process (K) in which the first positive electrode active material and the second positive electrode active material are mixed at the mixing ratio to obtain a positive electrode active material composed of the first positive electrode active material and the second positive electrode active material.