# US 12,224,423 B2 · Lithium composite oxide sintered body plate

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- Number: US 12,224,423 B2
- Document ID: US12224423B2
- Status: Granted
- Kind: B2
- Application number: 17/495,004
- Filed: 2021-10-06
- Published: 2022-01-27
- Granted: 2025-02-11
- Earliest claimed: 2017-02-13
- Assignees: NGK Insulators, Ltd.
- Applicants: Ngk Insulators, Ltd.
- Inventors: Yukinobu Yura; Shigeki Okada
- Web page: https://patentgrep.com/patent/US12224423B2

## CPC

- C04B 35/62218: {obtaining ceramic films, e.g. by using temporary supports}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- C04B 35/01: based on oxide ceramics
- C04B 38/02: by adding chemical blowing agents
- 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 4/364: {as mixtures}
- 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 10/0436: {Small-sized flat cells or batteries for portable equipment}
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C04B 2111/00853: {in electrochemical cells or batteries, e.g. fuel cells}
- C04B 2235/3203: Lithium oxide or oxide-forming salts thereof
- C04B 2235/3275: Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite
- C04B 2235/6025: Tape casting, e.g. with a doctor blade
- C04B 2235/6562: Heating rate
- C04B 2235/6567: Treatment time
- C04B 2235/6587: Influencing the atmosphere by vaporising a solid material, e.g. by using a burying of sacrificial powder
- C04B 2235/661: Multi-step sintering
- C04B 2235/77: Density
- C04B 2235/785: Submicron sized grains, i.e. from 0,1 to 1 micron
- C04B 2235/786: Micrometer sized grains, i.e. from 1 to 100 micron
- C04B 2235/787: Oriented grains
- 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
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Provided is a lithium complex oxide sintered plate for use in a positive electrode of a lithium secondary battery. The lithium complex oxide sintered plate has a structure in which a plurality of primary grains having a layered rock-salt structure are bonded, and has a porosity of 3 to 40%, a mean pore diameter of 15 μm or less, an open porosity of 70% or more, and a thickness of 15 to 200 μm. The plurality of primary grains has a primary grain diameter, i.e., a mean diameter of the primary grains, of 20 μm or less and a mean tilt angle of more than 0° to 30° or less. The mean tilt angle is a mean value of the angles defined by the (003) planes of the primary grains and the plate face of the lithium complex oxide sintered plate.

## Claims

### Claim 1

A lithium secondary battery comprising:
a positive electrode that is a lithium complex oxide sintered plate including a first major plate face and a second major plate face that is opposite from and parallel to the first major plate face;
a negative electrode; and
a separator between the positive electrode and the negative electrode, the separator being disposed on one of the first or second major plate faces of the lithium complex oxide sintered plate,
wherein the lithium complex oxide sintered plate has a structure in which a plurality of primary grains having a layered rock-salt structure are bonded, and has:
a porosity of 3 to 40%,
a mean pore diameter of 0.1 μm or more and 15 μm or less,
an open pore rate of 70% or more and 95% or less, and
a thickness of 15 to 200 μm,
wherein the primary grains have a primary grain diameter of 0.5 μm or more and 20 μm or less and a mean tilt angle of more than 0° to 30° or less, the mean tilt angle being a mean value of the angles defined by the (003) planes of the primary grains and one of the first or second major plate faces of the lithium complex oxide sintered plate,
wherein a ratio of individual primary grains having a tilt angle of more than 0° to 30° or less among all primary grains is 60% or more, and the tilt angle being defined by the (003) plane of the primary grain and one of the first or second major plate faces of the lithium complex oxide sintered plate, and
wherein the sintered plate does not include a binder.

### Claim 2 (depends on 1)

The lithium secondary battery according to claim 1, wherein the negative electrode is formed of a carbonaceous material.

### Claim 3 (depends on 1)

The lithium secondary battery according to claim 1, wherein the negative electrode is formed of a ceramic plate of a negative electrode active material that is sintered.

### Claim 4 (depends on 1)

The lithium secondary battery according to claim 1, wherein the ratio of individual primary grains having tilt angles of 0° to 30° among all the primary grains is 80% or more.

### Claim 5 (depends on 1)

A smart card having the lithium secondary battery according to claim 1.

### Claim 6 (depends on 1)

A wearable device having the lithium secondary battery according to claim 1.