Cathode of all-solid lithium battery and secondary battery using the same

Patent metadata

Field	Value
Publication number	US-11177472-B2
Application number	US-201916402918-A
Country	US
Kind code	B2
Filing date	May 3, 2019
Priority date	Dec 31, 2014
Publication date	Nov 16, 2021
Grant date	Nov 16, 2021

Abstract

Disclose are a cathode of an all-solid lithium battery, and a secondary battery system using the same. The cathode includes a lithium composite, and a method of manufacturing the lithium composite comprises: dispersing a solid electrolyte to be uniformly distributed in the pores of a mesoporous conductor to provide a solid electrolyte composite, and coating the solid electrolyte composite on the surface of a lithium compound including nonmetallic solids such as S, Se, and Te.

First claim

What is claimed is:

1. A method for manufacturing a cathode of an all-solid lithium battery, comprising:
dispersing a solid electrolyte in pores of a mesoporous conductor to provide a solid electrolyte composite;
preparing a lithium composite by coating the solid electrolyte composite on a surface of a lithium compound particle; and
connecting a plurality of the lithium composites using a binder,
wherein the lithium compound is an active material of the cathode, and
the mesoporous conductor comprises a metallic element and a carbon material such that the mesoporous conductor has an electric resistance value of about 10 −6 Ω·m or less.

2. The method of claim 1 , wherein the lithium compound is represented as Li 2 X, wherein the X comprises at least one selected from the group consisting of S, Se, and Te.

3. The method of claim 1 , wherein the solid electrolyte is uniformly distributed in the pores of the mesoporous conductor.

4. The method of claim 1 , the method further comprising, coating a slurry of the lithium composite connected by the binder on a cathode collector, and then, rolling the coated slurry.

5. The method of claim 1 , wherein a size of the mesoporous conductor is from about 10 nm to about 100 μm, a porosity of the mesoporous conductor is from about 10 to about 90 vol %, and a size of the pores of the mesoporous conductor is from about 2 nm to about 50 nm.

6. The method of claim 1 , wherein the solid electrolyte is a material in a two-phase or more including a Li element, and the solid electrolyte comprises one or more selected from the group consisting of oxide-based solid electrolyte including lithium oxide and sulfur-based solid electrolyte including lithium sulfur.

7. The method of claim 1 , wherein the solid electrolyte is dispersed in the pores of the mesoporous conductor by a melting-diffusion method, a infiltration method, or a gas-solid mixing method.

8. The method of claim 1 , wherein the solid electrolyte is uniformly distributed in the pores of the mesoporous conductor, by preparing a solid electrolyte solution by dispersing the solid electrolyte in a solvent, mixing the solid electrolyte solution with the mesoporous conductor, and evaporating the solvent.

9. The method of claim 1 , wherein the coating of the solid electrolyte composite is performed by a dry ball milling, a dry planetary milling, mechanofusion, a wet ball milling, or a wet planetary milling.

10. The method of claim 1 , wherein the binder comprises one or more selected from the group consisting of a fluorine-based binder and a rubber-based binder.

11. The method of claim 4 , wherein the slurry is coated by a slip casting, pressure casting, tape casting, or gel casting method.

12. The method of claim 4 , wherein the rolling is performed by a compaction, a roll press, or an isostatic compaction, and the rolling is performed under the condition of a compression ratio of about 20 to 50%.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Woo Hee Jin
• Jin Dae Gun
• Ryu Hee Yeon
• Lee Yoon Ji
• Kim Yong Gu
• Shin Na Ry
• Kwon Eun Ji
• Park Sang Jin

Classifications

• H01M2300/0065

  Solid electrolytes · CPC title

• H01M4/58

  of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates · CPC title

• H01M4/5815

  Sulfides · CPC title

• H01M4/62

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

• H01M4/00

  Electrodes · CPC title