Method for manufacturing solid electrolyte membrane for all solid type battery and solid electrolyte membrane manufactured by the method

Patent metadata

Field	Value
Publication number	US-11908993-B2
Application number	US-202217724933-A
Country	US
Kind code	B2
Filing date	Apr 20, 2022
Priority date	May 15, 2017
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

A solid electrolyte membrane and method of preparing, including a plurality of polymer filaments arranged crossed as a 3-dimensional structure in the form of a net of nonwoven fabric-like shape, and a plurality of inorganic solid electrolytes inserted and uniformly distributed in the structure. By this structural feature, a large amount of solid electrolyte particles are uniformly distributed and filled in the electrolyte membrane, contact between the particles is good, and ionic conduction paths are sufficiently provided. Additionally, the durability of the solid electrolyte membrane is improved by the 3-dimensional structure, and the flexibility and strength increase. The nonwoven fabric composite solid electrolyte membrane has an effect in preventing inorganic solid electrolyte particle from being disconnected therefrom.

First claim

What is claimed is:

1. A battery comprising an anode, a cathode and a solid electrolyte membrane interposed between the anode and the cathode, the solid electrolyte membrane comprising:
a plurality of inorganic solid electrolyte particles; and
a plurality of polymer filaments, wherein the plurality of polymer filaments are entangled and arranged crossed and linked to form a 3-dimensional mesh structure,
the mesh structure is filled with the plurality of inorganic solid electrolyte particles along a thicknesswise direction,
a content of the plurality of inorganic solid electrolyte particles in the solid electrolyte membrane ranges from 40 wt % to 90 wt % based on a total weight of the solid electrolyte membrane, and
the solid electrolyte membrane has a porosity of 10 vol % or less.

2. The battery according to claim 1 , wherein the plurality of polymer filaments comprise a polymer material selected from the group consisting of polyolefin, polyester, polyamide, polyacetal, polycarbonate, polyimide, polyetherketone, polyethersulfone, polyphenyleneoxide, polyphenylenesulfide, polyvinyledene fluoride, polyvinyl chloride, polyacrylonitrile, cellulose, polyparaphenylenebenzobisoxazole, and mixtures thereof.

3. The battery according to claim 1 , wherein the plurality of inorganic solid electrolyte particles comprise a particle type comprising at least one of primary particles and secondary particles, said secondary particles comprising an agglomeration of primary particles.

4. The battery according to claim 1 , wherein the plurality of polymer filaments have a diameter of 100 nm to 2 μm.

5. The battery according to claim 1 , wherein the plurality of inorganic solid electrolyte particles comprise at least one of an oxide-based solid electrolyte and a sulfide-based solid electrolyte.

6. The battery according to claim 1 , wherein the plurality of inorganic solid electrolyte particles and the plurality of polymer filaments are included in the solid electrolyte membrane at a weight ratio of 99:1 to 30:70.

7. The battery according to claim 1 , wherein the solid electrolyte membrane has a porosity of 8 vol % or less.

8. The battery according to claim 1 , wherein the solid electrolyte membrane has a porosity of 3 vol % or less.

9. The battery according to claim 1 , wherein the solid electrolyte membrane has a porosity close to 0 vol %.

10. The battery according to claim 1 , wherein the solid electrolyte membrane has an air permeability of 3,000 sec/100 cc or above.

11. A method for manufacturing the battery according to claim 1 , comprising a method for manufacturing a solid electrolyte membrane, the method comprising:
preparing a nonwoven fabric precursor in which a plurality of polymer filaments are gathered;
preparing a solid electrolyte membrane-forming slurry;
obtaining a mixture in which the nonwoven fabric precursor and the solid electrolyte membrane-forming slurry are mixed;
drying the mixture to obtain a preliminary solid electrolyte membrane; and
pressing the preliminary solid electrolyte membrane to obtain the solid electrolyte membrane, wherein the solid electrolyte membrane has a porosity of 10 vol % or less.

12. The method for manufacturing the battery according to claim 11 , wherein the plurality of polymer filaments are obtained by spinning by an electrospinning method.

13. The method for manufacturing the battery according to claim 11 , wherein the solid electrolyte membrane has a porosity of 8 vol % or less.

14. The method for manufacturing the battery according to claim 11 , wherein the solid electrolyte membrane has a porosity of 3 vol % or less.

15. The method for manufacturing the according to claim 11 , wherein the solid electrolyte membrane has an air permeability of 3,000 sec/100 cc or above.

Assignees

• Lg Energy Solution Ltd

Inventors

• Cho Sung-Ju
• Shin Ho-Suk
• Woo Seung-He
• Kang Sung-Joong
• Han Hyea-Eun

Classifications

• H01M10/056 Primary

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title

• H01M10/0525

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

• H01M50/403

  Manufacturing processes of separators, membranes or diaphragms · CPC title

• H01M50/42

  Acrylic resins · CPC title

• H01M50/431

  Inorganic material · CPC title