Li2S@C composite incorporated into 3D reduced graphene oxide as a cathode material for lithium-sulfur batteries

Vertical‐Aligned Li2S–Graphene Encapsulated within a Carbon Shell as a Free‐Standing Cathode for Lithium–Sulfur Batteries

“…As shown in Figure1b,c, the VG arrays show au niform vertical structure composed of numerous cross-linked nanosheets of 5-7 nm. The interplanar lattice spacingo fa bout 0.33 nm, is indexed well with the (111)p lane spacingo fL i 2 S. [45] As seen in Figure2c, the TEM image of VG/ Li 2 S-C composite demonstrates similar structure to that of VG/ Li 2 S, but the Li 2 Sn anoparticles are coated by an amorphous carbons hell with thickness of 5-10 nm. After adding Li 2 Ss olution and evaporation, the surface of the VG becomes much rougher (Figure 1d,e), indicating that the VG is homogeneously coated by Li 2 Sn anoparticles of 5-20 nm.…”

Metal Sulfide‐Decorated Carbon Sponge as a Highly Efficient Electrocatalyst and Absorbant for Polysulfide in High‐Loading Li2S Batteries

“…[20][21][22][23][24] However, the high initial charge barrier, low conductivity, soluble intermediate lithium polysulfide (LiPS) dissolution into the organic liquid electrolyte, and sluggish kinetics during the Li-S redox reaction remain a serious challenge that must be solved for the practical application of the Li 2 S cathode. [29][30][31] The high initial charge barrier can be reduced through a reduction of the particle size of Li 2 S [32][33][34] and an incorporation of P 2 S 5 into the electrolyte. For example, the conductivity of Li 2 S composite can be effectively improved by physically confining the Li 2 S within the structure of a conductive carbonaceous matrix.…”

A mechanochemical synthesis of submicron-sized Li2S and a mesoporous Li2S/C hybrid for high performance lithium/sulfur battery cathodes

“…Comparing the capacity of the Li2S/C systems at the 0.1C after the comparable cycle numbers, the present one shows higher retained capacity than the nano-Li2S/C systems prepared by chemical reaction in THF, 29 solution based re-precipitated 3D-rGO-Li2S system further carbon coated by the pyrolysis of PVP. 53 Though the present retained capacity after the 26 comparable cycles is inferior to the those Li2S/C systems, 28,34,37,40 however, the Li2S content and the Li2S loading on the electrode of the present system is much higher than those systems, which commonly results in lower apparent specific capacity and cyclic stability. Moreover, it is no doubt that low Li2S content of the Li2S/C system will reduces the volumetric specific capacity, which is undesired for practical application.…”