Coated sulfur particle electrode and method

Patent metadata

Field	Value
Publication number	US-11362335-B2
Application number	US-201615550741-A
Country	US
Kind code	B2
Filing date	Feb 12, 2016
Priority date	Feb 13, 2015
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

A coated sulfur particle and methods are shown. In one example, the coated sulfur particles are used as an electrode in a battery, such as a lithium ion battery.

First claim

What is claimed is:

1. A method of forming a battery electrode, comprising:
forming a number of polymer coated sulfur particles, including adding hydrochloric acid dropwise to sodium thiosulfate pentahydrate and polyvinylpyrrolidone (PVP) to precipitate PVP coated sulfur particles;
converting the polymer coating to a silicon dioxide coating using a silicon reactant to form a number of silicon dioxide coated sulfur particles with a conforming thin film silicon dioxide coating;
mixing the silicon dioxide coated sulfur particles with an amount of graphene oxide, and mildly reducing the amount of graphene oxide while mixed with the silicon dioxide coated sulfur particles to form a silicon dioxide coated particle-conductor composite; and
shaping an amount of the silicon dioxide coated sulfur particle-conductor composite into an electrode.

2. The method of claim 1 , wherein forming a number of polymer coated sulfur particles includes forming a number of polyvinylpyrrolidone (PVP) coated sulfur particles.

3. The method of claim 1 , wherein converting the polymer coating to a silicon dioxide coating using a silicon reactant includes mixing the number of polymer coated sulfur particles with a tetraethyl orthosilicate (TEOS) solution.

4. The method of claim 1 , wherein mixing the silicon dioxide coated sulfur particles includes mixing the silicon dioxide coated sulfur particles with an amount of carbon black.

5. The method of claim 1 , wherein mildly reducing the amount of graphene oxide while mixed with the silicon dioxide coated sulfur particles includes reacting with hydrazine.

6. The method of claim 5 , wherein mixing the silicon dioxide coated sulfur particles with an amount of graphene oxide includes mixing the silicon dioxide coated sulfur particles with a suspension of graphene oxide in deionized water.

7. The method of claim 6 , wherein reacting with hydrazine includes reacting in the deionized water at zero degrees Centigrade.

Assignees

• Univ California

Inventors

• Campbell Brennan
• Bell Jeffrey
• Bay Hamed Hosseini
• Favors Zachary
• Ozkan Cengiz S
• Ozkan Mihrimah

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• H01M4/366

  as layered products · CPC title