Improved cycling stability of lithium–sulphur batteries by enhancing the retention of active material with a sandwiched hydrothermally treated graphite film

Abstract

Dou, S. (2016). Improved cycling stability of lithium-sulphur batteries by enhancing the retention of active material with a sandwiched hydrothermally treated graphite film. RSC Advances, 6 (41), 34131-34136. Improved cycling stability of lithium-sulphur batteries by enhancing the retention of active material with a sandwiched hydrothermally treated graphite film AbstractA new lithium-sulphur battery with a hydrothermally treated graphite film sandwiched between the separator and the sulphur cathode shows increased capacity, enhanced cycling stability and improved coulombic efficiency. After 50 cycles, a high capacity of 631 mA h g-1 is maintained, compared to 203 mA h g-1 for the Li-S battery with conventional configuration. Moreover, the coulombic efficiency is increased to near 100% from around 94%. This improved electrochemical performance could be attributed to the new cell configuration, because the graphite film greatly retains the active material by alleviating the polysulphide shuttling problem and providing extra reaction sites for sulphur species. Moreover, the Coulombic efficiency is increased to near 100% from around 94%. This improved electrochemical performance could be attributed to the new cell configuration, for the graphite film greatly retains the active material by elliviating the polysulphide shuttling problem and providing extra reaction sites for sulphur species.

A Flexible 3D Multifunctional MgO‐Decorated Carbon Foam@CNTs Hybrid as Self‐Supported Cathode for High‐Performance Lithium‐Sulfur Batteries

“…Owing to the high theoretical specific capacity (1675 mAh g −1 ) and high theoretical energy density (2600 Wh kg −1 ) of lithium‐sulfur (Li‐S) batteries based on the two‐electron reaction from S to Li 2 S, Li‐S batteries have drawn considerable attentions and been considered as the promising energy‐storage systems . In addition, sulfur is abundant, low‐cost, and environmentally friendly . Unfortunately, the development of Li‐S batteries is still obstructed by several issues that must be addressed; for instance, the extremely poor electronic conductivity of sulfur and the discharge final products (Li 2 S 2 /Li 2 S), the large volumetric expansion of sulfur particles, the high dissolution of long‐chain polysulfide intermediates in organic electrolyte, and the unwanted shuttle effect during the charge–discharge process .…”

Graphene Oxide/Carbon Nanotube Bilayer Flexible Membrane for High‐Performance Li–S Batteries with Superior Physical and Electrochemical Properties

“…[9,10] Nevertheless, there are obstacles that should be overcome for the development of Li-S batteries, including the insulating nature of sulfur (5 × 10 −30 S cm −1 ), the large volume change of sulfur (≈80%), and the poor cycle performance by the shuttle phenomenon. [31,32] Among them, conductive carbon materials such as carbon fiber, [33][34][35][36][37] porous carbon, [38][39][40][41][42] graphite, [43][44][45] graphene Developing a highly effective interlayer inserted between the sulfur electrode and separator is one of the most important issues in Li-S battery research, because this interlayer enhances the cycle performance of the Li-S battery by trapping the lithium polysulfides in the sulfur electrode. These lithium polysulfides diffuse to the Li metal anode, leading to a loss of sulfur from the sulfur electrode and low coulombic efficiency (CE).…”

Carbon Nanotubes as Effective Interlayer for High Performance Li-I2Batteries: Long Cycle Life and Superior Rate Performance

“…Carbon nanotubes can block the dissolution of iodine species, and enhance the rate performance of iodine cathode. 22,23 Therefore, the assembled novel Li-I 2 batteries in this work can show excellent rate performance with much longer cycle life (up to 5000cycles, >99.5% capacity retention), compared to aqueous Li-I 2 batteries.…”