# US 11,910,713 B2 · Thermoelectric conversion technique

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- Number: US 11,910,713 B2
- Document ID: US11910713B2
- Status: Granted
- Kind: B2
- Application number: 17/512,623
- Filed: 2021-10-27
- Published: 2022-02-17
- Granted: 2024-02-20
- Earliest claimed: 2019-09-09
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Hiromasa Tamaki; Yuriko Kaneko; Hiroki Sato; Tsutomu Kanno; HyunJeong Nam
- Web page: https://patentgrep.com/patent/US11910713B2

## CPC

- H10N 10/8556: {comprising compounds containing germanium or silicon}
- C01B 33/06: Metal silicides (alloys C22)
- H10N 10/17: characterised by the structure or configuration of the cell or thermocouple forming the device
- H10N 10/851: comprising inorganic compositions
- C01P 2002/60: Compounds characterised by their crystallite size
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2002/77: by unit-cell parameters, atom positions or structure diagrams
- C01P 2006/32: Thermal properties
- C01P 2006/40: Electric properties
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The present disclosure provides a thermoelectric conversion material having a composition represented by a chemical formula of Li2−a+bMg1−bSi. In this thermoelectric conversion material, either requirement (i) in which 0≤a≤0.0001 and 0.0001≤b≤0.25-a or requirement (ii) in which 0.0001≤a≤0.25 and 0≤b≤0.25-a is satisfied. The thermoelectric conversion material has an Li8Al3Si5 type crystalline structure.

## Claims

### Claim 1

A thermoelectric conversion material having a composition represented by a chemical formula of Li2−a+bMg1−bSi,
wherein either the following requirements (i) or (ii) is satisfied:
Requirement (i): 0≤a≤0.0001 and 0.0001≤b≤0.25-a, and
Requirement (ii): 0.0001≤a≤0.125 and 0≤b≤0.25-a.

### Claim 2 (depends on 1)

The thermoelectric conversion material according to claim 1,
wherein the thermoelectric conversion material has a p-type polarity.

### Claim 3 (depends on 1)

The thermoelectric conversion material according to claim 1,
wherein the thermoelectric conversion material has a polycrystalline structure, and
the polycrystalline structure includes crystalline grains having an average grain diameter of larger than or equal to 0.64 nm and smaller than or equal to 100 nm.

### Claim 4 (depends on 3)

The thermoelectric conversion material according to claim 3,
wherein the average grain diameter is larger than or equal to 0.64 nm and smaller than or equal to 10 nm.

### Claim 5 (depends on 1)

A p-type thermoelectric conversion element comprising:
a thermoelectric conversion portion,
wherein the thermoelectric conversion portion comprises the thermoelectric conversion material according to claim 1.

### Claim 6 (depends on 1)

A thermoelectric conversion element comprising:
a p-type thermoelectric conversion portion;
an n-type thermoelectric conversion portion;
a first electrode;
a second electrode; and
a third electrode,
wherein:
one end of the p-type thermoelectric conversion portion and one end of the n-type thermoelectric conversion portion are electrically connected to each other with the first electrode interposed therebetween,
the other end of the p-type thermoelectric conversion portion is electrically connected to the second electrode,
the other end of the n-type thermoelectric conversion portion is electrically connected to the third electrode, and
the p-type thermoelectric conversion portion contains the thermoelectric conversion material according to claim 1.

### Claim 7 (depends on 1)

A method for obtaining an electric power using a thermoelectric conversion material, the method comprising:
applying a temperature difference to the thermoelectric conversion material,
wherein the thermoelectric conversion material is the thermoelectric conversion material according to claim 1.

### Claim 8 (depends on 1)

A method for transporting heat using a thermoelectric conversion material, the method comprising:
applying a current to the thermoelectric conversion material,
wherein the thermoelectric conversion material is the thermoelectric conversion material according to claim 1.

### Claim 9 (depends on 1)

The thermoelectric conversion material according to claim 1, wherein the thermoelectric conversion material has a crystalline structure same as an Li8Al3Si5 crystalline structure.

### Claim 10 (depends on 1)

The thermoelectric conversion material according to claim 1, wherein a crystalline structure of the thermoelectric conversion material belongs to a space group of P-43m.

### Claim 11 (depends on 1)

The thermoelectric conversion material according to claim 1,
wherein when 0.0001≤a≤0.125 and 0.0001≤b≤0.125, a conductivity of the thermoelectric conversion material is in the range of 93 S/cm to 8089 S/cm.