High-Capacity Rechargeable Lithium-Sulfur Batteries with a Conductive/Porous Insertion Layer and Methods of Making the Same
Physical Sciences : Materials and Compounds
Available for licensing
- Arumugam Manthiram, Ph.D. , Mechanical Engineering
- Yu-Sheng Su , University of Texas at Austin
The theoretical energy density of sulfur cathodes is relatively large compared to oxide or phosphate cathodes; however, realizing their full capacity is difficult due to the poor active material utilization of Li-S batteries, which results from sulfur’s low conductivity. Moreover, the intermediate polysulfides that form during discharge/charge processes are easily soluble in electrolytes. The higher-order polysulfide ions shuttle in electrolytes between the anode and cathode, which drastically decreases the couloumbic efficiency of the Li-S batteries.
Many approaches have been taken to tackle the drawbacks of sulfur cathodes. Preliminary research results have shown promising prospects of Li-S battery systems; however, the cathode material processing steps were elaborate and complicated, limiting the practicality and profitability of manufacturing a viable lithium-sulfur cell.
Researchers at The University of Texas at Austin have developed a facile method of inserting a bi-functional conductive and porous layer between the sulfur cathode and the separator, which can enhance both the specific capacity and cyclability of Li-S batteries. This original design is facile and feasible to fabricate Li-S batteries with high capacity.
Higher capacity and cyclability than Li-S battery without any insertion layers
- Low-cost processing
Cell configuration and design for rechargeable lithium-sulfur batteries
- 1 U.S. patent issued: 9,246,149