A group of Korean researchers led by Professor Lee Jae-Young at the Gwangju Institute of Science and Technology said that they succeeded in improving the energy capacity of lithium-sulfur batteries with Vitamin-C treated dual layered graphene-sulfur.
Lithium-Sulfur batteries are widely considered as a viable replacement for current lithium-ion batteries for electric cars because of its superior energy density. Yet, lithium sulfur batteries have not been actively used in the field since there are few problems to be resolved such as poor cycle performance and low charge/discharge rates.
The dual layered cathode is composed of a sulfur active layer and a poly-sulfide absorption layer
and both layers are based on Vitamin-C treated graphene oxide at various degrees of reduction.
However, the researchers showed that their Vitamin C treated dual layered cathode can increase sulfur utilization dramatically resulting in a lithium-sulfur battery with a high specific capacity of over 600 mAh/g after 100 cycles even under a high current rate of 1C.
The researchers state that this development can greatly improve low cycle performance of lithium-sulfur batteries, which is big obstacle to commercialization of them, and possibly open the door to using lithium-sulfur batteries in next-generation electric car batteries.
The results of development were published in the online version of ChemSusChem on April 29 with the title of "Improvement of energy capacity via Vitamin C-treated dual-layered graphene-sulfur cathodes in lithium sulfur battery".
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