Improved Cathode Materials for Li-S Batteries via Inverse Vulcanization of Sulfur With Vinylic Comonomers and Tungsten Disulfide (Ws2) FillersTechnology #ua17-004
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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.
- 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
- 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