Cathode for lithium-sulfur battery and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-10862130-B2
Application number	US-201816202946-A
Country	US
Kind code	B2
Filing date	Nov 28, 2018
Priority date	Aug 1, 2013
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

The present application relates to a cathode for a lithium-sulfur battery and a method of preparing the same. More specifically, the cathode for a lithium-sulfur battery according to an exemplary embodiment of the present application includes: a cathode active part including a sulfur-carbon composite; and a cathode coating layer including an amphiphilic polymer provided on at least one portion of a surface of the cathode active part and including a hydrophilic portion and a hydrophobic portion.

First claim

The invention claimed is:

1. A method of preparing a cathode for a lithium-sulfur battery, the method comprising:
forming a cathode active part comprising a sulfur-carbon composite; and
forming a cathode coating layer, which comprises an amphiphilic polymer comprising a hydrophilic portion and a hydrophobic portion, on at least one portion of a surface of the cathode active part,
wherein the cathode coating layer consists of an amphiphilic polymer comprising polyvinyl pyrrolidone (PVP),
wherein the cathode coating layer comprises pores and the pores have an average diameter of 1 nm to 10 μm,
wherein the cathode coating layer has a porosity of 50 to 95% based on a total volume of the cathode coating layer, and
wherein the cathode coating layer has a thickness of 10 nm to 1 μm.

2. The method of claim 1 , wherein the forming of the cathode coating layer utilizes a composition comprising the amphiphilic polymer, and utilizes dip coating, die coating, comma coating, gravure coating or bar coating methods.

3. The method of claim 2 , wherein the composition comprising the amphiphilic polymer additionally comprises a solvent, and
a content of the amphiphilic polymer is 1 to 30 wt % based on a total weight of the composition.

Assignees

• Lg Chemical Ltd

Inventors

• Son Byoungkuk
• Jang Minchul
• Kim Min Seo
• Sung Da Young
• Lee Seong Ho

Classifications

• 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

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M10/056

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

• H01M10/052

  Li-accumulators · CPC title

• H01M4/0402

  Methods of deposition of the material · CPC title