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-2019372149-A1
Application number	US-201816473137-A
Country	US
Kind code	A1
Filing date	May 15, 2018
Priority date	May 15, 2017
Publication date	Dec 5, 2019
Grant date	—

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

1 . A solid electrolyte membrane comprising:
a plurality of inorganic solid electrolytes; 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, and the mesh structure is filled with the inorganic solid electrolyte particles along a thicknesswise direction.

2 . The solid electrolyte membrane 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 solid electrolyte membrane according to claim 1 , wherein the plurality of inorganic solid electrolytes 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 solid electrolyte membrane according to claim 1 , wherein the plurality of polymer filaments have a diameter of 100 nm to 2 μm.

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

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

7 . A method for manufacturing a solid electrolyte membrane for an all solid type battery, 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 a solid electrolyte membrane.

8 . The method for manufacturing a solid electrolyte membrane for an all solid type battery according to claim 7 , wherein the plurality of polymer filaments are obtained by spinning by an electrospinning method.

Assignees

• Lg Chemical Ltd

Inventors

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

Classifications

• H01M10/0525

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

• H01M10/056 Primary

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

• H01M2/16

  Electricity · mapped topic

• H01M50/403

  Manufacturing processes of separators, membranes or diaphragms · CPC title

• H01M50/443

  Particulate material · CPC title