Oxide ion conductor and electrochemical device

Patent metadata

Field	Value
Publication number	US-11634339-B2
Application number	US-201916954872-A
Country	US
Kind code	B2
Filing date	Feb 12, 2019
Priority date	Feb 15, 2018
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

An oxide ion conductor has a X 3 Z 2 (TO 4 ) 3 structure, where X is a divalent metal element, Z is a trivalent metal element, and T is a tetravalent metal element, and has a composition expressed by (X 1-x A x ) 3 (Z 1-y B y ) 2 (T 1-z C z ) 3 O 12+δ where the element X is Ca, Fe, Gd, Ba, Sr, Mn, and/or Mg, the element Z is Al, Cr, Fe, Mn, V, Ga, Co, Ni, Ru, Rh, and/or Ir, the element T is Si and/or Ge, an element A is La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and/or Sr, an element B is Zn, Mn, Co, Ru, and/or Rh, and an element C is Si, Al, Ga, and/or Sn, 0≤x≤0.2, 0≤y≤0.2, and 0≤z≤0.2 are satisfied, and δ is a value securing electrical neutrality.

First claim

What is claimed is:

1. An oxide ion conductor, comprising an oxide having a X 3 Z 2 (TO 4 ) 3 structure, where X is a divalent metal element, Z is a trivalent metal element, and T is a tetravalent metal element,
the oxide ion conductor having a composition expressed by Formula (1)
(X 1-x A x ) 3 (Z 1-y B y ) 2 (T 1-z C z ) 3 O 12+δ   (1)

where
(a) the element X is Mg, the element Z is Al, and the element T is Si,
(b) the element X is Mg, the element Z is Ga, and the element T is Ge, or
(c) the element X is Ca, the element Z is Ga, and the element T is Ge,
an element A is different from the element X and at least one element selected from a group consisting of La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Sr,
an element B is different from the element Z and at least one element selected from a group consisting of Zn, Mn, Co, Ru, and Rh,
an element C is different from the element T and at least one element selected from a group consisting of Si, Al, Ga, and Sn,
0≤x≤0.2, 0≤y≤0.2, and 0≤z≤0.2 are satisfied, and
δ is a value securing electrical neutrality.

2. An oxide ion conductor, comprising an oxide having a X 3 Z 2 (TO 4 ) 3 structure, where X is a divalent metal element, Z is a trivalent metal element, and T is a tetravalent metal element,
the oxide ion conductor having a composition expressed by Formula (1.1)
(Ca 1-x A x ) 3 (Fe 1-y B y ) 2 (Ge 1-z C z ) 3 O 12+δ   (1.1)

where
the element A is at least one element selected from a group consisting of La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Sr,
the element B is at least one element selected from a group consisting of Zn, Mn, Co, Ru, and Rh,
the element C is at least one element selected from a group consisting of Si, Al, Ga, and Sn,
0≤x≤0.2, 0≤y≤0.2, and 0≤z≤0.2 are satisfied, with the proviso that at least one of x, y and z is at least 0.01, and
δ is a value securing electrical neutrality.

3. An electrochemical device including the oxide ion conductor according to claim 1 .

4. An electrochemical device including the oxide ion conductor according to claim 2 .

Assignees

• Toyota Chuo Kenkyusho Kk

Inventors

• Kajita Seiji
• OHBA Nobuko
• Suzumura Akitoshi
• Tajima Shin
• Asahi Ryoji

Classifications

• C04B2235/6567

  Treatment time · CPC title

• C04B35/01

  based on oxide ceramics · CPC title

• C04B2235/3272

  Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite · CPC title

• C04B2235/96

  Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance · CPC title

• H01M2300/0074

  Ion conductive at high temperature · CPC title