Electrochemical energy storage beyond Li-ion technology: Optimization of cathode and anode in Li-S batteries

Event

When:
Fri, 03 Nov 2017, 03:00 pm - 04:00 pm
Where:
Natural Science Bldg. 112 - Louisville, KY
Category:
Condensed Matter Sack Lunch
Who:
Ruchira Dharmasena
Affiliation:
University of Louisville, Department of Physics and Astronomy

Description

Lithium-sulfur batteries have attracted worldwide attention due to its potential for achieving higher energy density than lithium ion battery technology. Sulfur, as a cathode has an excellent theoretical gravimetric discharge capacity of 1672 mAh g-1. However, Li-S battery technology suffers from poor cyclability caused by poor- electrical conductivity of sulfur and low durability due to dissolution of polysulfides into the electrolyte. Further, use of metal lithium for the anode in Li-S batteries raises safety problems.

Herein, we investigate a novel and facile technique to fabricate the sulfur cathode for Li-S batteries with better cyclability and higher stable gravimetric capacity. In this study we have experimented the use of mesoporous TiO2 coating to prevent polysulfide dissolution into the electrolyte. For the anode, experiments are being conducted on pre-lithiation of MoO3 in place of lithium metal. Sulfur cathode and pre-lithiated anode are finally assembled to fabricate a high capacity and durable Li-S full cell. The full cell fabrication requires careful consideration of the irreversible capacity loss of each electrode and appropriate mass compensation.


Venue

Location:
Natural Science Bldg. 112