Enhancement of long stability of Li–S battery by thin wall hollow spherical structured polypyrrole based sulfur cathode

Abstract

To enhance the long stability of sulfur cathode for a high-energy lithium–sulfur cell, a thin wall hollow spherical structured polypyrrole (T-HSSP) composed of a mono layer of PPy nano-particles is employed as a host to encapsulate the sulfur component.

A selenium@polypyrrole hollow sphere cathode for rechargeable lithium batteries

“…Thus a cross-linked Se-PPy network is developed. A similar phenomenon is observed in S@PPy composite 30 . Figure 3.…”

“…PPy hollow spheres were synthesized by a modified template process as described in our previous work 30 . The Se@PPy hollow sphere composite was prepared by a melt-diffusion approach.…”

Micro-nano structure composite cathode material with high sulfur loading for advanced lithium–sulfur batteries

“…For example, by encapsulating sulfur in hollow carbon nanofibers, the carbon-sulfur composite demonstrates experimentally high specific capacity and excellent electrochemical cycling of the cells [9]. Other conductive matrixes with hollow structure, such as hollow carbon spheres [16][17][18], hollow polymer spheres [26][27][28], hollow polymer nanotube [29] and carbon nanotube [12][13][14], have been investigated as promising host materials for sulfur. These encouraging results suggest that the hollow structure might have several advantages including relatively abundant pore for efficient sulfur uptake and polysulfides containment, sufficient space to withstand volumetric expansion and short transport length for…”

Conducting polymers and their inorganic composites for advanced Li-ion batteries: a review

“…Thin wall hollow spherical structured PPy composed with sulfur can buffer the volume expansion during charge/discharge have proposed for Li-S batteries (Fig. 10) 244 . A long cycle of electrode in real battery is highly dependent on volume expansion and surface degradation of materials.…”