Composite cathode active material and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11217785-B2
Application number	US-201815871245-A
Country	US
Kind code	B2
Filing date	Jan 15, 2018
Priority date	Jan 24, 2017
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A composite cathode active material including: a core particle; a first coating layer; and a second coating layer; wherein the core particle includes a cathode active material, the first and second coating layers cover a surface of the core particle, the first coating layer includes a first lithium-containing compound, wherein the first lithium-containing compound includes zirconium, niobium, titanium, aluminum, or a combination thereof, the second coating layer includes a second lithium-containing compound, wherein the second lithium-containing compound includes germanium, niobium, gallium, or a combination thereof, and the first lithium-containing compound is different from the second lithium-containing compound.

First claim

What is claimed is:

1. A composite cathode active material comprising:
a core particle;
a first coating layer; and
a second coating layer,

wherein
the core particle comprises a lithium transition metal oxide having a layered halite structure,
the first and second coating layers cover a surface of the core particle,
the first coating layer comprises a first lithium-containing compound, wherein the first lithium-containing compound comprises aLi 2 O—ZrO 2 where 0.1≤a≤2, lithium titanium oxide, lithium aluminum oxide, lithium niobium oxide, or a combination thereof,
the second coating layer comprises a second lithium-containing compound, wherein the second lithium-containing compound comprises germanium, niobium, gallium, or a combination thereof,
the first lithium-containing compound is different from the second lithium-containing compound,
the first coating layer is disposed on the surface of the core particle, and the second coating layer is disposed on a surface of the first coating layer,
the first coating layer has a thickness of about 1 nanometer to about 50 nanometers,
a total thickness of the first coating layer and the second coating layer is greater than about 1 nanometer to about 500 nanometers,
the composite cathode active material comprises a plurality of core particles, and
the core particles of the plurality of core particles have a mean particle diameter of about 0.1 micrometers to about 10 micrometers.

2. The composite cathode active material of claim 1 , wherein the first coating layer is disposed directly on the surface of the core particle, and the second coating layer is disposed directly on a surface of the first coating layer.

3. The composite cathode active material of claim 1 , wherein the second lithium-containing compound comprises lithium germanium oxide, lithium niobium oxide, lithium gallium oxide, or a combination thereof.

4. A cathode comprising the composite cathode active material according to claim 1 .

5. A lithium secondary battery comprising:
the cathode according to claim 4 ;
an anode; and
a sulfide solid electrolyte between the cathode and the anode.

6. A composite cathode active material comprising:
a core particle;
a first coating layer; and
a second coating layer,

wherein
the core particle comprises a cathode active material,
the first and second coating layers cover a surface of the core particle,
the first coating layer comprises a first lithium-containing compound, wherein the first lithium-containing compound comprises zirconium, niobium, titanium, aluminum, or a combination thereof,
the second coating layer comprises a second lithium-containing compound, wherein the second lithium-containing compound comprises germanium, niobium, gallium, or a combination thereof,
the first lithium-containing compound is different from the second lithium-containing compound,
the first coating layer is disposed on the surface of the core particle, and the second coating layer is disposed on a surface of the first coating layer, and
the core particle comprises LiNi x Co y M z O 2 where M is aluminum or manganese, 0<x<1, 0<y<1, and x+y+z=1,
the first coating layer has a thickness of about 1 nanometer to about 50 nanometers,
a total thickness of the first coating layer and the second coating layer is greater than about 1 nanometer to about 500 nanometers,
the composite cathode active material comprises a plurality of core particles, and
the core particles of the plurality of core particles have a mean particle diameter of about 0.1 micrometer to about 10 micrometers.

7. The composite cathode active material of claim 6 , wherein 0.5<x<1.

8. A cathode comprising the composite cathode active material according to claim 6 .

9. A lithium secondary battery comprising:
the cathode according to claim 8 ;
an anode; and
a sulfide solid electrolyte between the cathode and the anode.

10. An all-solid-state lithium secondary battery comprising:
a cathode comprising a composite cathode active material comprising
a core particle;
a first coating layer; and
a second coating layer,

wherein
the core particle comprises a cathode active material,
the first and second coating layers cover a surface of the core particle,
the first coating layer comprises a first lithium-containing compound, wherein the first lithium-containing compound comprises zirconium, niobium, titanium, aluminum, or a combination thereof,
the second coating layer comprises a second lithium-containing compound, wherein the second lithium-containing compound comprises germanium, niobium, gallium, or a combination thereof,
the first lithium-containing compound is different from the second lithium-containing compound,
the first coating layer is disposed on the surface of the core particle, and the second coating layer is disposed on a surface of the first coating layer,

an anode; and
an electrolyte between the cathode and the anode,
wherein the electrolyte comprises a sulfide solid electrolyte,
the first coating layer has a thickness of about 1 nanometer to about 50 nanometers,
a total thickness of the first coating layer and the second coating layer is greater than about 1 nanometer to about 500 nanometers,
the composite cathode active material comprises a plurality of core particles, and
the core particles of the plurality of core particles have a mean particle diameter of about 0.1 micrometers to about 10 micrometers.

11. The all-solid-state lithium secondary battery of claim 10 , wherein the sulfide solid electrolyte comprises sulfur, lithium, and phosphorus, silicon, boron, aluminum, germanium, zinc, gallium, indium, a halogen, or a combination thereof.

12. The all-solid-state lithium secondary battery of claim 10 , wherein the sulfide solid electrolyte comprises lithium sulfide and silicon sulfide, phosphorus sulfide, boron sulfide, or a combination thereof.

13. The all-solid-state lithium secondary battery of claim 10 , wherein the sulfide solid electrolyte comprises Li 2 S and P 2 S 5 .

14. The all-solid-state lithium secondary battery of claim 10 , wherein the sulfide solid electrolyte is in a form of a particle.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Ito Seitaro
• Shiratsuchi Tomoyuki
• Aihara Yuichi
• Tsujimura Tomoyuki

Classifications

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M2300/0068

  inorganic · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title