Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 22, Issue 11, Pages 3557-3568Publisher
SPRINGER
DOI: 10.1007/s10008-018-4059-z
Keywords
Lithium-sulfur battery; Cathode; Mesoporous silica; Graphene; Polysulfide adsorption
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Funding
- National Science Foundation of China (NSFC) [51372052, 51772060, 51621091]
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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 (1567mAhg(-1) at 0.1C). 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 (400mAhg(-1)) over 500 cycles at higher current of 2C.
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