LDH separator and zinc secondary battery

Patent metadata

Field	Value
Publication number	US-11211672-B2
Application number	US-202117189765-A
Country	US
Kind code	B2
Filing date	Mar 2, 2021
Priority date	Dec 13, 2018
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

Provided is an LDH separator including a porous substrate and a layered double hydroxide (LDH) that fills up pores of the porous substrate. The LDH is composed of a plurality of hydroxide base layers containing Mg, Al, Ti, and OH group; and interlayers which are interposed between the plurality of hydroxide base layers and composed of anions and H2O.

First claim

What is claimed is:

1. An LDH separator comprising a porous substrate and a layered double hydroxide (LDH) that fills up pores of the porous substrate,
wherein the LDH is composed of a plurality of hydroxide base layers composed of Mg, Al, Ti, and OH groups, or composed of Mg, Al, Ti, OH groups, and unavoidable impurities, and interlayers which are interposed between the plurality of hydroxide base layers and composed of anions and H 2 O, and
wherein an atomic ratio of Ti/Al in the LDH, determined by energy dispersive X-ray analysis (EDS), is 1.2 to 11.3.

2. The LDH separator according to claim 1 , wherein an atomic ratio of Ti/(Mg+Ti+Al) in the LDH, determined by energy dispersive X-ray analysis (EDS), is 0.1 to 0.7.

3. The LDH separator according to claim 1 , wherein an atomic ratio of Al/(Mg+Ti+Al) in the LDH, determined by energy dispersive X-ray analysis (EDS), is 0.05 to 0.4.

4. The LDH separator according to claim 1 , wherein an atomic ratio of Mg/(Mg+Ti+Al) in the LDH, determined by energy dispersive X-ray analysis (EDS), is 0.2 to 0.7.

5. The LDH separator according to claim 1 , wherein the porous substrate is composed of a polymer material.

6. The LDH separator according to claim 5 , wherein the polymer material is selected from the group consisting of polystyrene, polyether sulfone, polypropylene, an epoxy resin, polyphenylene sulfide, a fluororesin, cellulose, nylon, and polyethylene.

7. The LDH separator according to claim 1 , wherein the LDH separator has an ionic conductivity of 2.0 mS/cm or more.

8. The LDH separator according to claim 1 , wherein the LDH separator has a He permeability per unit area of 10 cm/min·atm or less.

9. A zinc secondary battery comprising the LDH separator according to claim 1 .

10. A solid alkaline fuel cell comprising the LDH separator according to claim 1 .

Assignees

• Ngk Insulators Ltd

Inventors

• Yamamoto Sho
• Inukai Naoko
• Yokoyama Shohei

Classifications

• H01M50/449 Primary

  having a layered structure · CPC title

• H01M50/497

  Ionic conductivity · CPC title

• H01M50/409

  Separators, membranes or diaphragms characterised by the material · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M10/30

  Nickel accumulators (H01M10/34 takes precedence) · CPC title