Battery using layered double hydroxide

Patent metadata

Field	Value
Publication number	US-10700385-B2
Application number	US-201715471300-A
Country	US
Kind code	B2
Filing date	Mar 28, 2017
Priority date	Oct 1, 2014
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

Provided is a battery including a layered double hydroxide. The battery includes a positive electrode, a negative electrode, an electrolytic solution being an aqueous alkali metal hydroxide solution, and a layered double hydroxide having a fundamental composition represented by the formula: M 2+ 1−x M 3+ x (OH) 2 A n− x/n ·mH 2 O where M 2+ represents a divalent cation, M 3+ represents a trivalent cation, A n− represents an n-valent anion, n is an integer of 1 or more, x is 0.1 to 0.4, and m is any real number, the layered double hydroxide being in contact with the electrolytic solution, wherein a metal compound containing a metal corresponding to M 2+ and/or M 3+ is dissolved in the electrolytic solution such that erosion of the layered double hydroxide by the electrolytic solution is suppressed. The present invention provides a highly reliable battery such that the degradation of a layered double hydroxide (LDH) contained in the battery can be significantly reduced.

First claim

What is claimed is:

1. A battery comprising:
a positive electrode;
a negative electrode;
an electrolytic solution being an aqueous alkali metal hydroxide solution; and
a layered double hydroxide separator exhibiting hydroxide ion conductivity, and having a fundamental composition represented by the formula: M 2+ 1−x M 3+ x (OH) 2 A n− x/n ·mH 2 O where M 2+ where M 2+ represents a divalent cation, M 3+ represents a trivalent cation, A n− represents an n-valent anion, n is an integer of 1 or more, x is 0.1 to 0.4, and m is any real number, the layered double hydroxide separator being in contact with the electrolytic solution and separating the positive electrode from the negative electrode, wherein
a metal compound containing a metal corresponding to M 2+ and/or M 3+ is dissolved in the electrolytic solution such that erosion of the layered double hydroxide by the electrolytic solution is suppressed.

2. The battery according to claim 1 , wherein the aqueous alkali metal hydroxide solution is an aqueous potassium hydroxide solution.

3. The battery according to claim 1 , wherein the metal dissolved in the electrolytic solution is in the form of a metal ion, a hydroxide, and/or a hydroxy complex.

4. The battery according to claim 1 , wherein the metal compound is preliminarily dissolved in the electrolytic solution.

5. The battery according to claim 1 , wherein M 2+ comprises Mg 2+ , M 3+ comprises Al 3+ , and A n− comprises OH − and/or CO 3 2− in the formula.

6. The battery according to claim 1 , wherein the metal compound comprises a metal corresponding to M 3+ .

7. The battery according to claim 1 , wherein the metal compound comprises Al.

8. The battery according to claim 7 , wherein the electrolytic solution has an Al concentration of 0.1 mol/L to 20 mol/L.

9. The battery according to claim 7 , wherein the electrolytic solution has an Al concentration of 2.0 mol/L to 20 mol/L.

10. The battery according to claim 7 , wherein the electrolytic solution has an Al concentration of 0.001 mol/L to 20 mol/L.

11. The battery according to claim 1 , wherein the metal compound is aluminum hydroxide and/or γ-alumina.

12. The battery according to claim 1 , wherein the separator further comprises an additional material.

13. The battery according to claim 12 , wherein the additional material is a polymer.

14. The battery according to claim 1 , wherein the separator is densified to exhibit water impermeability and gas impermeability.

15. The battery according to claim 1 , further comprising a porous substrate disposed on either or both of the surfaces of the separator.

16. The battery according to claim 1 , wherein the negative electrode is coated with the layered double hydroxide.

Assignees

• Ngk Insulators Ltd

Inventors

• Yokoyama Shohei
• Yamamoto Sho
• Yamada Naohito

Classifications

• H01M50/491

  Porosity · CPC title

• H01M50/434

  Ceramics · CPC title

• H01M50/449

  having a layered structure · CPC title

• H01M50/431

  Inorganic material · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title