Investigation of graphene aerogels as a porous carbon matrix for lithium-sulfur batteries
DOI:
https://doi.org/10.18321/cpc543Keywords:
graphene aerogel, sulfur, lithium-sulfur batteries, discharge capacity, lithium polysulfides.Abstract
Lithium-sulfur batteries are a new generation of energy storage systems due to their high theoretical capacity (1675 mAh/g), specific energy consumption (2600 W·h·kg-1) and operational safety. Moreover, this type of batteries is attractive in view of the replacement of expensive metal-based cathode materials (nickel, cobalt) with cheap and available sulfur. However, the industrial use of lithium-sulfur batteries is limited by the low electrical conductivity of sulfur, the dissolution of its products in the electrolyte, and the volumetric expansion during cyclic charge-discharge of batteries due to the high density difference between sulfur and its products (lithium polysulfides). This paper demonstrates the possibility of using graphene-based aerogels as a porous electrically conductive matrix for sulfur immobilization in order to form cathodes for lithium sulfur batteries. The developed cathode material based on graphene aerogel and sulfur demonstrated a high value of the initial discharge capacity (1313 mAh/g) with its average decrease by 0.5% per 1 cycle during 75 chargedischarge cycles (0.1 C). The obtained results demonstrate that graphene-based aerogels are
promising materials for sulfur immobilization due to their high porosity, light weight, and electrical conductivity.
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