Polysulfide-Scission Reagents for the Suppression of the Shuttle Effect in Lithium-Sulfur Batteries.
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-2sulfur 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.
Nanomaterials & Chemistry Key Laboratory, Wenzhou University , Wenzhou 325027, China.
Wuxing
W
Hua
Nanomaterials & Chemistry Key Laboratory, Wenzhou University , Wenzhou 325027, China.
Zhi
0000-0002-9265-5041
Z
Yang
Nanomaterials & Chemistry Key Laboratory, Wenzhou University , Wenzhou 325027, China.
Huagui
H
Nie
Nanomaterials & Chemistry Key Laboratory, Wenzhou University , Wenzhou 325027, China.
Zhongyu
Z
Li
Nanomaterials & Chemistry Key Laboratory, Wenzhou University , Wenzhou 325027, China.
Jizhang
J
Yang
Nanomaterials & Chemistry Key Laboratory, Wenzhou University , Wenzhou 325027, China.
Zeqing
Z
Guo
Nanomaterials & Chemistry Key Laboratory, Wenzhou University , Wenzhou 325027, China.
Chunping
C
Ruan
Nanomaterials & Chemistry Key Laboratory, Wenzhou University , Wenzhou 325027, China.
Xi'an
X
Chen
Nanomaterials & Chemistry Key Laboratory, Wenzhou University , Wenzhou 325027, China.
Shaoming
S
Huang
dithiothreitol; interlayer; lithium−sulfur batteries; polysulfide-scission; porous carbon nanotube