Corresponding Author

Chang-ming LI(ecmli@swu.edu.cn)


Lithium-sulphur (Li-S) battery is regarded as a promising energy storage device because of its high theoretical capacity. However, the low S utilization and short cycling life limit the commercial applications. In this work, nitrogen-doped graphene-like carbon (NGC) materials were synthesized by simply pyrolyzing and carbonizing the mixture of melamine (C3H6N6) and L-cysteine (C3H7NO2S). The graphene-like structure in NGC effectively buffered the volume change of S during the discharge/charge process and improved the cycling stability. Meanwhile, nitrogen-containing functional groups in NGC facilitated the transportation of ions and suppressed the dissolution of polysulphide (PS), enabling a high utilization of S. As expected, the NGC-8 (the mass ratio of melamine and L-cysteine being 8:1)/PS cathode delivered a high initial discharge capacity of 1164.1 mAh·g-1 at 0.2 C and still retained 909.4 mAh·g-1 capacity after 400 cycles with a slow capacity decay rate of 0.05% per cycle. Even at as high as 2 C, a high-rate capacity of 820 mAh·g-1 could be achieved.

Graphical Abstract


lithium-sulphur battery, graphene-like carbon, volume change, cycling stability

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