A nanoporous nitrogen-doped graphene for high performance lithium sulfur batteries
A nanoporous N-doped reduced graphene oxide (p-N-rGO) was prepared through carbothermal reaction between graphene oxide and ammonium-containing oxometalates as sulfur host for Li-S batteries. The p-N-rGO sheets have abundant nanopores with diameters of 10-40nm and the nitrogen content is 2.65at%. When used as sulfur cathode, the obtained p-N-rGO/S composite has a high reversible capacity of 1110mAhg -1 at 1C rate and stable cycling performance with 781.8mAhg -1 retained after 110 cycles, much better than those of the rGO/S composite. The enhanced electrochemical performance is ascribed to the rational combination of nanopores and N-doping, which provide efficient contact and wetting with the electrolyte, accommodate volume expansion and immobilize polysulfides during cycling.
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