Abstract
Lithium-sulfur (Li-S) battery with new configuration is demonstrated by inserting a flexible activated carbon nanofiber (ACNF) interlayer between the sulfur cathode and the separator. The ACNF with tunable pore structure is fabricated by a combination of electrospinning polyimide and a subsequent activation treatment. The influence of the textual characteristics of ACNFs on the electrochemical performance of Li-S batteries has been studied. The highly porous ACNF not only effectively intercepts/stabilizes the shuttling migration of polysulfides within the cathode region, but also provides reliable ionic/electronic conductivity for fast kinetics. The lightweight ACNF interlayer with higher specific surface area can yield enhanced cell performance at a low mass ratio of ACNF/sulfur (0.4). An initial specific capacity of 1224 mAh g-1 along with high Coulombic efficiency, long cycling stability and good rate capability is achieved in the modified Li-S cell.
| Original language | English |
|---|---|
| Pages (from-to) | 271-276 |
| Number of pages | 6 |
| Journal | Electrochimica Acta |
| Volume | 168 |
| DOIs | |
| State | Published - 20 Jun 2015 |
Keywords
- Carbon nanofiber
- Cell configuration
- Electrospinning
- Lithium-sulfur battery
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