Solid state lithium-ion conductor

Patent metadata

Field	Value
Publication number	US-10770751-B2
Application number	US-201816205715-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	May 17, 2018
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

A compound of Formula 1:

Li 6+(4−a)x+c) M 4+ (2−x) A a+ x O (7−c) N′ c   (1)

wherein M is a tetravalent cationic element, A is a divalent or trivalent cationic element, N′ is an anion having a valence of less than −2, wherein when A is Y 3+ , In 3+ , Zn 2+ , or a combination thereof, 0.15<x≤0.5, otherwise 0≤x≤0.5, 0≤c≤2, and ((4−a)x+c)>0.

First claim

What is claimed is:

1. A compound of Formula 1 in a positive electrode, negative electrode or electrolyte, comprising:
Li (6+(4−a)x+c) M 4+ (2−x) A a+ x O (7−c) N′ c   (1)

wherein
M is a tetravalent cationic element,
A is a divalent or trivalent cationic element,
N′ is an anion Group 15 element,
wherein when A is Y 3+ , In 3+ , Zn 2− , or a combination thereof, 0.15<x≤0.5, otherwise
0≤x≤0.5, 0≤c≤2, and
((4−a)x+c)>0.

2. The compound of claim 1 , wherein M comprises an element of Group 4, Group 14, or a combination thereof.

3. The compound of claim 2 , wherein M is Zr, Hf, or a combination thereof.

4. The compound of claim 1 , wherein A comprises Mg, Ca, Zn, or a combination thereof.

5. The compound of claim 1 , wherein A comprises Y, Gd, Ga, In, Al, La, Sc, or a combination thereof.

6. The compound of claim 1 , wherein N′ is N.

7. The compound of claim 1 , wherein 0.1≤((4−a)x+c)≤0.4.

8. The compound of claim 1 , wherein the compound is of Formula 2:
Li (6+2a′−a″+c) M (2−(a′+a″)) A′ a′ A″ a″ O 7−c N′ c   (2)

wherein
M comprises Zr, Hf, or a combination thereof,
A′ is a divalent cationic element,
A″ is a trivalent cationic element,
N′ is an anion having a valence of less than −2,

wherein when A′ is Zn, 0.15<a′≤0.5, or when A″ is Y or In, 0.15<a″≤0.5, otherwise
0≤a′≤0.5, 0≤a″≤0.5, 0≤c≤1, and
(a′+a″+c)>0.

9. The compound of claim 8 , wherein A′ is Mg, A″ is Sc, and N′ is N, and
wherein 0.1<(2a′+a″+c)<0.3, 0<a′<0.15, 0≤a″<0.3, and 0≤c≤0.3.

10. The compound of claim 1 , having an ionic conductivity of greater than 1×10 −7 Siemens per centimeter.

11. The compound of claim 7 , having an ionic conductivity of 1×10 −6 to 1×10 −2 Siemens per centimeter.

12. A component of a lithium secondary electrochemical cell comprising the compound of Formula 1
Li (6+(4−a)x+c) M 4+ (2−x) A a+ x O (7−c) N′ c   (1)

wherein
M is a tetravalent cationic element,
A is a divalent or trivalent cationic element,
N′ is an anion of a Group 15 element,
wherein when A is Y 3+ , In 3+ , Zn 2+ , or a combination thereof, 0.15<x≤0.5, otherwise 0≤x≤0.5, 0≤c≤2, and ((4−a)x+c)>0.

13. The component of claim 9 , wherein the component is an electrolyte.

14. The component of claim 9 , wherein the component is in the form of a protection layer on a negative electrode comprising lithium metal, a lithium metal alloy, or combination thereof.

15. An electrochemical cell comprising:
a positive electrode;
a negative electrode; and
an electrolyte between the positive electrode and the negative electrode,

wherein at least one of the positive electrode, the negative electrode and the electrolyte comprise the compound of Formula 1
Li (6+(4−a)x+c) M 4+ (2−x) A a+ x O (7−c) N′ c   (1)

wherein
M is a tetravalent cationic element,
A is a divalent or trivalent cationic element,
N′ is an anion of a Group 15 element, wherein when A is Y 3+ , In 3+ , Zn 2+ , or a combination thereof, 0.15<x≤0.5, otherwise 0≤x≤0.5, 0≤c≤2, and ((4−a)x+c)>0.

16. The electrochemical cell of claim 14 , wherein the negative electrode comprises lithium metal, a lithium metal alloy, or combination thereof, and wherein the compound of Formula 1 is directly on the negative electrode.

17. A method of preparing the compound of claim 1 , the method comprising:
contacting a lithium compound, a compound comprising a tetravalent cationic element, a compound comprising at least one of divalent cationic element and a trivalent cationic element to provide a mixture; and
heat-treating the mixture to prepare the compound.

18. A method of manufacturing an electrochemical cell, the method comprising:
providing a negative electrode comprising lithium, a lithium alloy, or combination thereof;
disposing the compound of Formula 1 on the negative electrode;
disposing an electrolyte on the negative electrode; and
disposing a positive electrode on the separator to manufacture the electrochemical cell.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Wang Yan
• Miara Lincoln

Classifications

• C01G27/006

  Compounds containing hafnium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01B1/08

  oxides · CPC title