# US 12,119,501 B2 · Coin-type lithium secondary cell

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- Number: US 12,119,501 B2
- Document ID: US12119501B2
- Status: Granted
- Kind: B2
- Application number: 17/203,950
- Filed: 2021-03-17
- Published: 2021-07-01
- Granted: 2024-10-15
- Earliest claimed: 2018-10-30
- Assignees: NGK Insulators, Ltd.
- Applicants: Ngk Insulators, Ltd.
- Inventors: Yukinobu Yura; Kazuki Maeda; Masanori Tajima
- Web page: https://patentgrep.com/patent/US12119501B2

## CPC

- H01M 50/109: of button or coin shape
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/409: Separators, membranes or diaphragms characterised by the material
- H01M 50/434: Ceramics
- 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 2004/027: {Negative electrodes}
- 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
- 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 coin-type lithium secondary cell for soldering by reflow method includes a positive electrode including a lithium composite oxide, a negative electrode, an electrolyte layer provided between the positive electrode and the negative electrode and including an electrolytic solution, a cell case having an enclosed space in which the positive electrode, the negative electrode, and the electrolyte layer are housed. The positive electrode and the negative electrode as a whole contains 3.0% by mass or less of lithium carbonate.

## Claims

### Claim 1

A coin-type lithium secondary cell for soldering by reflow method, comprising:
a positive electrode containing a lithium composite oxide;
a negative electrode;
an electrolyte layer provided between said positive electrode and said negative electrode and containing an electrolytic solution; and
a cell case having an enclosed space in which said positive electrode, said negative electrode, and said electrolyte layer are housed,
wherein said positive electrode and said negative electrode as a whole contain 0.002% or more by mass and 3.0% or less by mass of lithium carbonate, and
wherein said positive electrode and said negative electrode are sintered bodies, which contain neither binders nor conductive assistants.

### Claim 2 (depends on 1)

The coin-type lithium secondary cell according to claim 1, wherein
said negative electrode contains a lithium composite oxide.

### Claim 3 (depends on 1)

The coin-type lithium secondary cell according to claim 1, wherein
said electrolyte layer includes a ceramic separator, and
said positive electrode, said ceramic separator, and said negative electrode are formed into an integral sintered body.

### Claim 4 (depends on 1)

The coin-type lithium secondary cell according to claim 1, wherein
said coin-type lithium secondary cell has a thickness of 0.7 to 1.6 mm and a diameter of 10 to 20 mm.

### Claim 5 (depends on 1)

The coin-type lithium secondary cell according to claim 1, wherein
said coin-type lithium secondary cell has an energy density of 35 to 200 mWh/cm3 before reflow soldering.

### Claim 6 (depends on 1)

The coin-type lithium secondary cell according to claim 1, wherein
said coin-type lithium secondary cell after reflow soldering has a capacity higher than or equal to 65% of the capacity of said coin-type lithium secondary cell before the reflow soldering.