Improved Cathode Materials for Li-S Batteries via Inverse Vulcanization of Sulfur With Vinylic Comonomers and Tungsten Disulfide (Ws2) Fillers

Technology #ua17-004

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Researchers
Dong-Chul (Jeffrey) Pyun
Professor, Chemistry & Biochemistry
Managed By
Paul Eynott
Sr. Licensing Manager (520) 621-2878

Title: Improved Cathode Materials for Li-S Batteries via Inverse Vulcanization of Sulfur with Vinylic Comonomers and Tungsten Disulfide (WS2) Fillers

Invention: This invention is a novel concept to prepare sulfur based cathode materials for lithium-sulfur (Li-S) batteries via the reaction of elemental liquid sulfur, vinylic comonomers and WS2 micron-sized particulates. This allows for the best Li-S battery performance with very high retention of charge capacity at fast charge-discharge rates.

 

Background: This approach is built on the inventor’s previous report of using a molybdenum sulfide micron sized particulates (MoS2) composite with either only liquid elemental sulfur, or the combination of MoS2, elemental sulfur (liquid) and vinylic comonomers. In earlier MoS2/S8 cathode materials, Li-S batteries fabricated with these materials were able to survive 1000 charge-discharge cycles while retaining charge capacities around 400 mAh/g. However, the best Li-S batteries made from these materials required a very high content of MoS2.

 

Applications:

  • Preparation of Li-S batteries with very fast charge/discharge rates when using only S8/WS2
  • Systems with very long cycle lifetimes with higher charge when further reacted with vinylic comonomers
  • Applicable for use in military systems, urban electric vehicles, marine propulsion, unmanned aerial vehicles, and grid storage2

 

Advantages:

  • A one-step, one-pot, inexpensive process with cheap materials
  • Allows for the best battery performance in Li-S batteries with a high retention of charge capacity and fast charge-discharge rates
  • Attractive for scaling up and translating to industry

 

Licensing Manager:

Paul Eynott

PaulE@tla.arizona.edu

(520) 471-2687