A multi-core–shell structured composite cathode material with a conductive polymer network for Li–S batteries

Abstract

A multi-core-shell with a conductive network structured C-PANI-S@PANI composite with high sulfur content up to 87% was synthesized. The composite cathode delivers higher specific capacity and excellent cycle stability, retaining a reversible discharge capacity of 835 mA h g(-1) after 100 cycles when the sulfur loading of the cathode was above 6 mg cm(-2).

Recent advances in lithium–sulfur batteries

“…In most coreeshell structures, sulfur or sulfur-based compound acts as the core. Furthermore, high content of sulfur up to approximately 85% embedded in the shell can be achieved [78,79]. Broadly speaking, coreeshell structures as a unique framework can be any dimensions based on the core.…”

New Insight into the Interaction between Carbonate-based Electrolyte and Cuprous Sulfide Electrode Material for Lithium Ion Batteries

“…Finally, cuprous sulfide is easily accessible and inexpensive, which makes it very attractive for commercialization. However, Cu 2 S suffers from a rapid capacity decay during cycling [2,14,15], which is attributed to the high solubility (in organic solvent electrolytes) of the polysulfide ions formed during the charge/discharge processes. The dissolution of the polysulfides resulted in low active material utilization, low coulombic efficiency and poor cycle life of Cu 2 S electrodes, thus the composition and polarity of the electrolyte can affect the cycling stability of Cu 2 S or CuS dramatically [7,16,17].…”

“…Lithium-ion batteries have gained tremendous attentions as energy storage devices due to their high energy density, high operating voltage and longer cycle life [1][2][3][4]. However, the application of large-scale lithium-ion batteries in HEVs is significantly hindered by several major technological barriers, including insufficient cycle life, poor charge/discharge rate capability, and intrinsically poor safety [5,6].…”

Hollow sulfur@graphene oxide core–shell composite for high-performance Li–S batteries

“…Despite these considerable advantages, commercial application of lithium-sulfur batteries has still be impeded due to their multiple intrinsic nature, including (1) the poor conductivity of both elemental sulfur (5 × 10 −30 S cm −1 at 25 °C) and its discharge product Li 2 S; (2) the dissolution of polysulfides and the resulting shuttling effect during the charge-discharge process; (3) the large volume expansion of S (80%) upon lithiation. These issues often accompany each other and greatly accelerate the capacity decay of Li-S batteries [8][9][10][11][12][13].…”