Journal
ADVANCED ENERGY MATERIALS
Volume 7, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201601630
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Funding
- EcoEII program
- BASF International Scientific Network for Electrochemistry and Batteries
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A comprehensive approach is reported to construct stable and high volumetric energy density lithium-sulfur batteries, by coupling a multifunctional and hierarchically structured sulfur composite with an in-situ cross-linked binder. Through a combination of first-principles calculations and experimental studies, it is demonstrated that a hybrid sulfur host composed by alternately stacking graphene and layered graphitic carbon nitride embraces high electronic conductivity as well as high polysulfide adsorptivity. It is further shown that the cross-linked elastomeric binder empowers the hierarchical sulfur composites-multi-microns in size-with the ability to form crack-free and compact high-loading electrodes using traditional slurry processing. Using this approach, electrodes with up to 14.9 mg cm(-2) sulfur loading and an extremely low electrolyte/ sulfur ratio as low as 3.5: 1 mu L mg(-1) are obtained. This study sheds light on the essential role of multifaceted cathode design and further on the challenges facing lithium metal anodes in building high volumetric energy density lithium-sulfur batteries.
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