期刊
ACS NANO
卷 11, 期 2, 页码 2209-2218出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b08627
关键词
lithium-sulfur batteries; porous carbon nanotube; polysulfide-scission; interlayer; dithiothreitol
类别
资金
- NSFC [51572197, 21273163, 21475096, 51420105002]
Lithium-sulfur batteries have become an appealing candidate for next-generation energy-storage technologies because of their low cost and high energy density. However, one of their major practical problems is the high solubility of long-chain lithium polysulfides and their infamous shuttle effect, which causes low Coulombic efficiency and sulfur loss. Here, we introduced a concept involving the dithiothreitol (DTT) assisted scission of polysulfides into lithium-sulfur system. Our designed porous carbon nanotube/S cathode coupling with a lightweight graphene/DTT interlayer (PCNTs-S@Gra/DTT) exhibited ultrahigh cycle-ability even at 5 C over 1100 cycles, with a capacity degradation rate of 0.036% per cycle. Additionally, the PCNTs-S@Gra/DTT electrode with a 3.51 mg cm(-2) sulfur mass loading delivered a high initial areal capacity of 5.29 mAh cm(-2) (1509 mAh g(-1)) at current density of 0.58 mA cm(-2), and the reversible areal capacity of the cell was maintained at 3.45 mAh cm(-2) (984 mAh g(-1)) over 200 cycles at a higher current density of 1.17 mA cm(-2). Employing this molecule scission principle offers a promising avenue to achieve high-performance lithium-sulfur batteries.
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