Abstract
Hydriodic acid and self-assembly approach are used to fabricate graphene wrapped sulfur composite. The self-assembly process of the relative "large" graphene sheet and "small" sulfur is quite controllable, and the sulfur particles are completely enfolded by RGO sheets with a unique stacked structure.The RGO/S composite with 80 wt.% sulfur shows an initial discharge capacity of 865.1 mAh g-1 at 0.5 mA/cm2. A high specific capacity of 720 mAh g-1 with a coulombic efficiency of 95% is achieved after 50 cycles of charge/discharge. The material also delivered a capacity of more than 580 mAh g-1 at 2 mA/cm2 and can be recovered to 736 mAh g-1 when the rate is returned to 0.2 mA/cm2, representing a promising cathode material for high current discharge lithium-sulfur batteries.
Original language | English |
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Pages (from-to) | 24-31 |
Number of pages | 8 |
Journal | Electrochimica Acta |
Volume | 163 |
DOIs | |
State | Published - 1 May 2015 |
Keywords
- electrostatic self-assembly
- graphene
- hydriodic acid
- lithium-sulfur battery
- sulfur