# US 12,113,196 B2 · Method of manufacturing positive electrode active material for lithium ion secondary battery, positive electrode active material for lithium ion secondary battery, and lithium ion secondary battery

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- Number: US 12,113,196 B2
- Document ID: US12113196B2
- Status: Granted
- Kind: B2
- Application number: 17/310,688
- Filed: 2020-02-18
- Published: 2022-03-31
- Granted: 2024-10-08
- Earliest claimed: 2019-02-21
- Assignees: Sumitomo Metal Mining Co., Ltd.; Panasonic Energy Co., Ltd.
- Applicants: Sumitomo Metal Mining Co., Ltd.
- Inventors: Shuhei Oda
- Web page: https://patentgrep.com/patent/US12113196B2

## CPC

- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/362: {Composites}
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes 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
- 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}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- 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

The present invention provides a method of manufacturing a positive electrode active material for a lithium ion secondary battery. The method includes a water-washing step of washing a lithium-nickel composite oxide containing lithium (Li), nickel (Ni), and an element M (M) (wherein, the element M is at least one element selected from Mn, V, Mg, Mo, Nb, T, Co, and Al) with water, and conducting a filtration to form a washed cake; a filling step of filling, the washed cake which is a material to be dried and a tungsten compound without lithium into a dryer; and a drying step of drying the material to be dried by the dryer with flowing, wherein the filling step includes a time period in which the washed cake and the tungsten compound without lithium are supplied to the dryer at the same time.

## Claims

### Claim 1

A method of manufacturing a positive electrode active material for a lithium ion secondary battery comprising:
a water-washing step of washing a lithium-nickel composite oxide containing lithium (Li), nickel (Ni), and an element M, (wherein, the element M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, Co, and Al) with water, and conducting a filtration to form a washed cake;
a filling step of filling the washed cake which is a material to be dried and a tungsten compound without lithium into a dryer; and
a drying step of drying the material to be dried by the dryer while the material to be dried is caused to flow,
wherein the filling step includes a time period in which the washed cake and the tungsten compound without lithium are supplied to the dryer at the same time.

### Claim 2 (depends on 1)

The method of manufacturing a positive electrode active material for a lithium ion secondary battery according to claim 1, wherein the lithium-nickel composite oxide contains lithium (Li), nickel (Ni), and the element M in an amount of substance ratio of Li:Ni:M=y:1-x:x, wherein, 0≤x≤0.70, 0.95≤y≤1.20.

### Claim 3 (depends on 1)

The method of manufacturing a positive electrode active material for a lithium ion secondary battery according to claim 1, wherein washing conditions in the water-washing step are selected such that an electrical conductivity of a filtrate obtained after the filtration is 40 mS/cm or more and 80 mS/cm or less.

### Claim 4 (depends on 1)

The method of manufacturing a positive electrode active material for a lithium ion secondary battery according to claim 1, wherein a water content of the washed cake obtained in the water-washing step is 3.0% by mass or more and 10.0% by mass or less.

### Claim 5 (depends on 1)

The method of manufacturing a positive electrode active material for a lithium ion secondary battery according to claim 1, wherein the tungsten compound without lithium is one or more kinds selected from a tungsten oxide (WO3) and a tungstic acid (WO3·H2O).

### Claim 6 (depends on 1)

The method of manufacturing a positive electrode active material for a lithium ion secondary battery according to claim 1, wherein a ratio of a number of tungsten atoms contained in the tungsten compound without lithium supplied in the filling step to a total number of atoms of nickel and the element M contained in the lithium-nickel composite oxide is 0.05% by atom or more and 3.0% by atom or less.

### Claim 7 (depends on 1)

The method of manufacturing a positive electrode active material for a lithium ion secondary battery according to claim 1, wherein a drying atmosphere is any one selected from a decarboxylated dried-air atmosphere, an inert gas atmosphere, and a vacuum atmosphere in the drying step.

### Claim 8 (depends on 1)

The method of manufacturing a positive electrode active material for a lithium ion secondary battery according to claim 1, wherein a drying temperature in the drying step is 100° C. or higher and 200° C. or lower.