High-rate, ultralong cycle-life lithium/sulfur batteries enabled by nitrogen-doped graphene
Y Qiu, W Li, W Zhao, G Li, Y Hou, M Liu, L Zhou… - Nano …, 2014 - ACS Publications
Nano letters, 2014•ACS Publications
Nitrogen-doped graphene (NG) is a promising conductive matrix material for fabricating high-
performance Li/S batteries. Here we report a simple, low-cost, and scalable method to
prepare an additive-free nanocomposite cathode in which sulfur nanoparticles are wrapped
inside the NG sheets (S@ NG). We show that the Li/S@ NG can deliver high specific
discharge capacities at high rates, that is,∼ 1167 mAh g–1 at 0.2 C,∼ 1058 mAh g–1 at 0.5
C,∼ 971 mAh g–1 at 1 C,∼ 802 mAh g–1 at 2 C, and∼ 606 mAh g–1 at 5 C. The cells also …
performance Li/S batteries. Here we report a simple, low-cost, and scalable method to
prepare an additive-free nanocomposite cathode in which sulfur nanoparticles are wrapped
inside the NG sheets (S@ NG). We show that the Li/S@ NG can deliver high specific
discharge capacities at high rates, that is,∼ 1167 mAh g–1 at 0.2 C,∼ 1058 mAh g–1 at 0.5
C,∼ 971 mAh g–1 at 1 C,∼ 802 mAh g–1 at 2 C, and∼ 606 mAh g–1 at 5 C. The cells also …
Nitrogen-doped graphene (NG) is a promising conductive matrix material for fabricating high-performance Li/S batteries. Here we report a simple, low-cost, and scalable method to prepare an additive-free nanocomposite cathode in which sulfur nanoparticles are wrapped inside the NG sheets (S@NG). We show that the Li/S@NG can deliver high specific discharge capacities at high rates, that is, ∼1167 mAh g–1 at 0.2 C, ∼1058 mAh g–1 at 0.5 C, ∼971 mAh g–1 at 1 C, ∼802 mAh g–1 at 2 C, and ∼606 mAh g–1 at 5 C. The cells also demonstrate an ultralong cycle life exceeding 2000 cycles and an extremely low capacity-decay rate (0.028% per cycle), which is among the best performance demonstrated so far for Li/S cells. Furthermore, the S@NG cathode can be cycled with an excellent Coulombic efficiency of above 97% after 2000 cycles. With a high active S content (60%) in the total electrode weight, the S@NG cathode could provide a specific energy that is competitive to the state-of-the-art Li-ion cells even after 2000 cycles. The X-ray spectroscopic analysis and ab initio calculation results indicate that the excellent performance can be attributed to the well-restored C–C lattice and the unique lithium polysulfide binding capability of the N functional groups in the NG sheets. The results indicate that the S@NG nanocomposite based Li/S cells have a great potential to replace the current Li-ion batteries.
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