Stabilizing the Performance of High-Capacity Sulfur Composite Electrodes by a New Gel Polymer Electrolyte...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Renewable energy sources like solar and wind power are crucial for combating pollution and global warming.
• Intermittent energy production necessitates advanced electrical energy-storage systems with high capacity and affordability.
• Lithium-sulfur batteries offer high theoretical energy density and utilize abundant, inexpensive sulfur, but face challenges in practical application.

Purpose of the Study:

• To address limitations in practical energy density and lifetime of lithium-sulfur batteries.
• To develop a cost-effective solution for stable performance using a sulfur-carbon composite.
• To investigate a novel gel polymer electrolyte (GPE) for improved lithium-sulfur battery functionality.

Main Methods:

• Development and implementation of a new gel polymer electrolyte (GPE).
• Utilizing a low-cost sulfur-carbon composite with 70% active sulfur loading.
• Employing Raman spectroscopy to analyze GPE morphology and the Li-anode/GPE interface during cycling.

Main Results:

• The GPE enables stable battery performance close to theoretical capacity.
• The GPE effectively prevents sulfur dissolution and mitigates polysulfide migration to the anode.
• Stable cycling and improved performance were achieved with the novel GPE and sulfur-carbon composite.

Conclusions:

• The developed GPE is a promising strategy for enhancing lithium-sulfur battery performance.
• This approach overcomes key limitations hindering commercialization of lithium-sulfur battery technology.
• The GPE facilitates stable operation by controlling crucial electrochemical processes within the battery.