Reduced graphene oxide-encapsulated mesoporous silica as sulfur host for lithium–sulfur battery
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With up to fivefold higher in energy density vs. lithium-ion battery, lithium–sulfur (Li–S) battery is a compelling energy storage system, complemented by a very low cost of sulfur. However, current Li–S cells face the capacity decay caused by the dissolution of lithium polysulfides. In this work, a new material concept, namely the “layer @ adsorbent” is introduced to address the capacity fading problem. This architecture utilizes mesoporous SiO2 holding sulfur and polysulfides and the whole S fused SiO2 was intimately encapsulated by reduced graphene oxide (RGO). Benefiting from the enhanced capillary force from SiO2, as well as the improved conductivity from RGO chamber, this “layer @ adsorbent” architecture could easily spread and adsorb polysulfides. The initial discharge capacity is approaching its theoretical capacity (1567 mAh g−1 at 0.1 C). A stable cycle performance over 500 cycles is demonstrated with the capacity loss of merely about 0.05% per cycle. Additionally, the cathode with higher sulfur content (67%) delivers a stable reversible capacity (400 mAh g−1) over 500 cycles at higher current of 2 C.
KeywordsLithium–sulfur battery Cathode Mesoporous silica Graphene Polysulfide adsorption
This work was financially supported by the National Science Foundation of China (NSFC, Grant numbers 51372052, 51772060, and 51621091). Data is available from the Online Resource or from the author.
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