New Carbon-Titanium Composite Dramatically Improves Lithium-Sulfur Batteries

A new carbon-titanium composite developed by the researchers in South Korea also improves the performance of lithium-sulfur batteries to a considerable extent. To be used in electric cars and portable devices, lithium-sulfur batteries have the potential to store much more energy with a lower weight than the current lithium-ion cells. A group of researchers at DGIST developed a honeycomb structure of titanium monoxide (TiO) nanoparticles into nitrogen-doped porous carbon. This single-step electrode structure has larger amounts of sulfur, and it conducts better and may significantly increase battery life.

Innovative Electrode Design

According to the paper, researchers used a simple magnesium reduction to embed titanium monoxide (TiO) nanoparticles into nitrogen-doped porous carbon. This creates a 3D honeycomb carbon framework that securely holds sulfur and provides high conductivity. The polar TiO and nitrogen strongly bind lithium polysulfides (charged sulfur compounds) and catalyze their reactions, preventing leakage and boosting battery efficiency. In tests, the Li-S cathode delivered 1082 mAh/g initially and retained ~580 mAh/g after 1000 cycles.

Potential Applications

The combination of the high energy density of lithium-sulfur and low mass has the potential to revolutionize devices, allowing electric cars to go much further and drones to remain up in the air much longer. During a single experiment, a Li-S battery had a UAV that was able to fly for more than 3 hours, and in future generation packs, an 8-hour flight expectancy has been achieved. Lightweight batteries could be installed in phones and laptops with significantly extended run times. Sulfur is inexpensive and in large quantities, and thus Li-S batteries can also be cheaper. This new carbon-titanium alloy would assist in taking these enhancements to the regular products by making Li-S cells more efficient and dependable.