# US 11,027,982 B2 · Mica-made member, electrochemical reaction unit, and electrochemical reaction cell stack

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- Number: US 11,027,982 B2
- Document ID: US11027982B2
- Status: Granted
- Kind: B2
- Application number: 16/332,042
- Filed: 2017-09-11
- Published: 2019-07-18
- Granted: 2021-06-08
- Earliest claimed: 2016-09-13
- Assignees: Morimura Sofc Technology Co., Ltd.
- Applicants: Morimura Sofc Technology Co., Ltd.
- Inventors: Satoru Ishida; Tomoki Murata; Ryoji Tanimura; Tatsuya Ono; Nobuyuki Hotta
- Web page: https://patentgrep.com/patent/US11027982B2

## CPC

- C01B 33/42: Micas {; Interstratified clay-mica products (delaminated mica or vermiculite platelets obtained by a process involving cation-exchange C04B14/208)}
- C25B 1/04: by electrolysis of water
- C25B 9/00: Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B 9/70: Assemblies comprising two or more cells
- H01M 8/02: Details (electrodes H01M4/86 - H01M4/98)
- H01M 8/242: comprising framed electrodes or intermediary frame-like gaskets (H01M8/2425, H01M8/244 take precedence)
- H01M 8/2457: with both reactants being gaseous or vaporised
- H01M 8/2483: characterised by internal manifolds
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- H01M 8/12: operating at high temperature, e.g. with stabilised ZrO2 electrolyte
- Y02E 60/50: Fuel cells
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A mica-made member having a crystal structure exhibiting an intensity peak of KMg3(Si3Al)O10(OH)2 and an intensity peak of Mg2SiO4 in X-ray diffractometry (XRD). Also disclosed is an electrochemical reaction unit including a structural member formed of the mica-made member and an electrochemical reaction cell stack.

## Claims

### Claim 1

An electrochemical reaction cell stack comprising a plurality of electrochemical reaction units arrayed in a first direction,
wherein at least one of the electrochemical reaction units is an electrochemical reaction unit,
the electrochemical reaction unit includes:
a unit cell including an electrolyte layer, and a cathode and an anode that face each other in a first direction with the electrolyte layer intervening therebetween; and
a structural member that faces a cathode chamber facing the cathode or an anode chamber facing the anode,
wherein the structural member is formed of a mica-made member that has been subjected to a heat treatment of 1,000° C. or higher for four or more hours so as to exhibit an intensity peak of KMg3(Si3Al)O10(OH)2 and an intensity peak of Mg2SiO4 in X-ray diffractometry (XRD), prior to assembling the structural member into the electrochemical reaction unit.

### Claim 2 (depends on 1)

The electrochemical reaction cell stack according to claim 1, wherein the ratio of the intensity of a peak of the (120) plane of Mg2SiO4 to the intensity of a peak of the (003) plane of KMg3(Si3Al)O10(OH)2 is 0.001 or more.

### Claim 3 (depends on 1)

The electrochemical reaction cell stack according to claim 1, wherein the ratio of the intensity of the peak of the (120) plane of Mg2SiO4 to the intensity of the peak of the (003) plane of KMg3(Si3Al)O10(OH)2 is 0.15 or less.

### Claim 4 (depends on 1)

The electrochemical reaction cell stack according to claim 1, wherein the ratio of the intensity of the peak of the (120) plane of Mg2SiO4 to the intensity of the peak of the (003) plane of KMg3(Si3Al)O10(OH)2 is 0.003 or more.

### Claim 5 (depends on 1)

The electrochemical reaction cell stack according to claim 1, wherein the ratio of the intensity of the peak of the (120) plane of Mg2SiO4 to the intensity of the peak of the (003) plane of KMg3(Si3Al)O10(OH)2 is 0.029 or less.

### Claim 6 (depends on 1)

The electrochemical cell stack according to claim 1, wherein the structural member formed of a mica-made member is subjected to heat treatment prior to assembly so as to reduce Si scattering of the mica upon operation of the assembled electrochemical reaction unit.