# US 12,224,395 B2 · Lithium secondary battery

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- Number: US 12,224,395 B2
- Document ID: US12224395B2
- Status: Granted
- Kind: B2
- Application number: 17/076,159
- Filed: 2020-10-21
- Published: 2021-02-11
- Granted: 2025-02-11
- Earliest claimed: 2018-05-17
- Assignees: NGK Insulators, Ltd.
- Applicants: Ngk Insulators, Ltd.
- Inventors: Yukinobu Yura; Shigeki Okada
- Web page: https://patentgrep.com/patent/US12224395B2

## CPC

- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/434: Ceramics
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- 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 50/431: Inorganic material
- H01M 50/437: Glass
- H01M 50/443: Particulate material
- H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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
- 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 secondary battery including a positive electrode layer composed of a lithium complex oxide sintered body, a negative electrode layer composed of a titanium-containing sintered body, a ceramic separator, an electrolytic solution, and an exterior body including a closed space, the closed space accommodating the positive electrode layer, the negative electrode layer, the ceramic separator, and the electrolytic solution, wherein the positive electrode layer, the ceramic separator, and the negative electrode layer are bonded together, the ceramic separator is composed of MgO and glass, the glass has an average grain size of 0.5 to 25 μm, and a ratio of the average grain size of the glass to the average grain size of MgO is 1.5 to 85.

## Claims

### Claim 1

A lithium secondary battery comprising:
a positive electrode layer composed of a lithium complex oxide sintered body;
a negative electrode layer composed of a titanium-containing sintered body;
a ceramic separator interposed between the positive electrode layer and the negative electrode layer;
an electrolytic solution with which the positive electrode layer, the negative electrode layer, and the ceramic separator are impregnated;
an exterior body comprising a closed space, the closed space accommodating the positive electrode layer, the negative electrode layer, the ceramic separator, and the electrolytic solution,
wherein the positive electrode layer, the ceramic separator, and the negative electrode layer are bonded together,
wherein the ceramic separator is a sintered body composed of MgO and glass, wherein the glass has an average grain size of 0.5 to 25 μm, and wherein a ratio of the average grain size of the glass to the average grain size of the MgO is 1.5 to 85.

### Claim 2 (depends on 1)

The lithium secondary battery according to claim 1, wherein the ratio of the average grain size of the glass to the average grain size of the MgO is 2.0 to 20.

### Claim 3 (depends on 1)

The lithium secondary battery according to claim 1, wherein the lithium complex oxide is lithium cobaltate.

### Claim 4 (depends on 1)

The lithium secondary battery according to claim 1, wherein the positive electrode layer has a thickness of 60 to 600 μm.

### Claim 5 (depends on 1)

The lithium secondary battery according to claim 1, wherein the positive electrode layer is an oriented positive electrode layer containing a plurality of primary grains composed of the lithium complex oxide, the plurality of primary grains being oriented at an average orientation angle of over 0° and 30° or less with respect to the layer face of the positive electrode layer.

### Claim 6 (depends on 1)

The lithium secondary battery according to claim 1, wherein the negative electrode layer has a thickness of 70 to 800 μm.

### Claim 7 (depends on 1)

The lithium secondary battery according to claim 1, wherein the titanium-containing sintered body comprises lithium titanate or niobium titanium complex oxide.

### Claim 8 (depends on 1)

The lithium secondary battery according to claim 1, wherein the ceramic separator has a thickness of 5 to 50 μm.

### Claim 9 (depends on 1)

The lithium secondary battery according to claim 1, wherein the glass grains comprise SiO2 in an amount of 25 wt % or more.

### Claim 10 (depends on 1)

The lithium secondary battery according to claim 1, wherein the glass grains are contained in the ceramic separator in an amount of 3 to 70 wt %.

### Claim 11 (depends on 1)

The lithium secondary battery according to claim 1, further comprising:
a positive electrode current collector; and
a negative electrode current collector.