Battery using layered double hydroxide

Patent metadata

Field	Value
Publication number	US-2017200981-A1
Application number	US-201715471300-A
Country	US
Kind code	A1
Filing date	Mar 28, 2017
Priority date	Oct 1, 2014
Publication date	Jul 13, 2017
Grant date	—

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 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.

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 1 , wherein the metal compound is aluminum hydroxide and/or γ-alumina.

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

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

11 . The battery according to claim 1 , wherein the layered double hydroxide is in the form of a separator exhibiting hydroxide ion conductivity, and the separator separates the positive electrode from the negative electrode.

12 . The battery according to claim 11 , 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 11 , wherein the separator is densified to exhibit water impermeability and gas impermeability.

15 . The battery according to claim 11 , 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

• H01M2300/0014

  Alkaline electrolytes · CPC title

• H01M4/52

  of nickel, cobalt or iron · CPC title

• H01M4/244

  Zinc electrodes · CPC title

• H01M10/26 Primary

  Selection of materials as electrolytes · CPC title

• H01M4/32

  Nickel oxide or hydroxide electrodes · CPC title