Coating composition for composite positive electrode active material and preparing method of composite positive electrode active material using the same

Patent metadata

Field	Value
Publication number	US-2023080239-A1
Application number	US-202217943795-A
Country	US
Kind code	A1
Filing date	Sep 13, 2022
Priority date	Sep 14, 2021
Publication date	Mar 16, 2023
Grant date	—

Abstract

Disclosed are a coating composition for a composite positive electrode active material and a method of preparing a composite positive electrode active material using the same.

First claim

What is claimed is:

1 . A coating composition for a composite positive electrode active material, comprising:
a lithium component; a phosphorus component; and an organic solvent dissolving the phosphorus component.

2 . The coating composition of claim 1 , wherein the phosphorus component comprises polyphosphoric acid.

3 . The coating composition of claim 1 , wherein the lithium component comprises one or more selected from the group consisting of lithium ethoxide, Li 2 CoO 3 , and LiOH.

4 . The coating composition of claim 1 , wherein the organic solvent includes one or more selected from the group consisting of an alcohol, a carbonate-based solvent, an ether-based solvent, and dimethyl sulfoxide.

5 . A method of preparing a composite positive electrode active material, comprising:
preparing a coating composition by dissolving a lithium component and a phosphorus component in an organic solvent; forming an admixture by adding a positive electrode active material to the coating composition and performing stirring; and heat treating the admixture to form the composite positive electrode active material comprising a core and a coating layer coated on the surface of the core, wherein a core comprises the positive electrode active material, and a coating layer including the coating composition is formed on the surface of the positive electrode active material.

6 . The method of claim 5 , wherein the phosphorus component comprises polyphosphoric acid.

7 . The method of claim 5 , wherein the lithium component comprises one or more selected from the group consisting of lithium ethoxide, Li 2 CoO 3 , and LiOH.

8 . The method of claim 5 , wherein the organic solvent comprises one or more selected from the group consisting of an alcohol, a carbonate-based solvent, an ether-based solvent, and dimethyl sulfoxide.

9 . The method of claim 5 , wherein the positive electrode active material comprises Li a [Ni x Co y Mn z M 1-x-y-z ]O 2 (wherein, 1.0≤a≤1.2, 0.0≤x≤1.0, 0.1≤y≤1.0, 0.0≤z≤1.0, 0.0≤1-x-y-z≤0 .3).

10 . The method of claim 5 , wherein the stirring is performed at a temperature of about −10° C. to +10° C. of the boiling point of the organic solvent.

11 . The method of claim 5 , further comprising drying the admixture before heat treating the admixture.

12 . The method of claim 5 , wherein the heat treating the admixture is performed at a temperature of about 300° C. to 500° C. in an oxygen atmosphere.

13 . The method of claim 5 , wherein the coating layer comprises Li 3 PO 4 .

14 . The method of claim 5 , wherein the coating layer has a thickness of about 0.5 nm to 50 nm.

15 . The method of claim 5 , wherein the coating layer has a thickness of about 1 nm to 2 nm.

16 . The method of claim 5 , wherein the composite positive electrode active material comprises the coating layer in an amount of about 0.01 wt % to 10 wt % based on the total weight of the composite positive electrode active material.

17 . The method of claim 5 , wherein the composite positive electrode active material comprises the coating layer in an amount of about 0.01 wt % to 0.05 wt % based on the total weight of the composite positive electrode active material.

18 . An all-solid-state secondary battery comprising a composite positive electrode active material prepared by a method of claim 5 .

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Kyonggi Univ Industry & Academia Cooperation

Inventors

• Noh Sung Woo
• Lee Sang Heon
• Park Je Sik
• Seo Jung Hyun
• Seo Im Sul
• Seong Ju Young
• Lim Chung Bum
• Park Yong Joon
• Lee Jun Su
• Yoon Da Hye
• Lee Joo Young

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title