Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 42, Pages 28663-28670Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b10032
Keywords
hydrothermal synthesis; graphene aerogel; polysulfide adsorption; titanium dioxide; chemical interactions; lithium-sulfur batteries
Funding
- Research Grants Council (GRF) [613612, 16212814]
- Innovation and Technology Commission (ITF Project) of Hong Kong SAR [ITS/318/14]
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Three-dimensional graphene aerogel/TiO2/sulfur (GA/TiO2/S) composites are synthesized through a facile, one-pot hydrothermal route as the cathode for lithium-sulfur batteries. With a high sulfur content of 75.1 wt %, the conductive, highly porous composite electrode delivers a high discharge capacity of 512 mA h/g after 250 cycles at a current rate of 1 C with a low capacity decay of 0.128% per cycle. The excellent capacities and cyclic stability arise from several unique functional features of the cathode. (i) The conductive graphene aerogel framework ameliorates ion/electron transfer while accommodating the volume expansion induced during discharge, and (ii) TiO2 nanoparticles play an important role in restricting the dissolution of polysulfides by chemical bonds with sulfur.
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