Fast-charging, high-energy, flexible lithium-sulfur batteries based on hierarchically ordered sulfur particles and preparation method thereof

Patent metadata

Field	Value
Publication number	US-12308434-B2
Application number	US-202117553947-A
Country	US
Kind code	B2
Filing date	Dec 17, 2021
Priority date	Jun 2, 2021
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

The present disclosure relates to a cathode active material for a secondary battery, comprising a poly(S-co-VPA) vulcanized polymer, a preparation method thereof, and a lithium-sulfur secondary battery comprising the same.

First claim

What is claimed is:

1. A cathode active material for a secondary battery comprising a poly(S-co-VPA) vulcanized polymer;
wherein the poly(S-co-VPA) vulcanized polymer comprises one or more moieties selected from the following Chemical Formulas SVPA1 and SVPA2 within a molecular structure,
the poly(S-co-VPA) vulcanized polymer has a three-dimensional porous network formed throughout the particles thereof, and
the three-dimensional porous network further contains sulfur allotropes physically supported within pores:

In formula, represents a bonding position, and
n is an integer between 1 and 20.

2. The cathode active material for the secondary battery of claim 1 , wherein the vulcanized polymer is an inverse vulcanized polymer.

3. The cathode active material for the secondary battery of claim 1 , wherein the poly(S-co-VPA) vulcanized polymer is spherical particles having a diameter of 50 to 800 microns.

4. The cathode active material for the secondary battery of claim 1 , wherein the cathode active material for the secondary battery comprises 80% to 95% by weight of sulfur with respect to 100% by weight of the total cathode active material for the secondary battery.

5. The cathode active material for the secondary battery of claim 1 , wherein the poly(S-co-VPA) vulcanized polymer comprises 40 to 70% by weight of sulfur and 30 to 60% by weight of vinylphosphonic acid (VPA).

6. The cathode active material for the secondary battery of claim 1 , wherein the secondary battery is a lithium-sulfur secondary battery.

7. A lithium-sulfur battery comprising the cathode active material for the secondary battery according to claim 1 .

8. The lithium-sulfur battery of claim 7 , wherein vinylphosphonic acid in the cathode active material chemically immobilizes lithium polysulfide within the lithium-sulfur battery.

Assignees

• Postech Res & Business Dev Found

Inventors

• Park Moon Jeong
• Kang Han Eol

Classifications

• C08F230/02

  containing phosphorus · CPC title

• H01M2004/021

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

• H01M2004/028

  Positive electrodes · CPC title

• C08F2800/20

  as weight or mass percentages · CPC title

• H01M10/0525

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