Ultra-thin Fe3C nanosheets promote the adsorption and conversion of polysulfides in lithium-sulfur batteries

Abstract

Y. (2018). Ultra-thin Fe 3 C nanosheets promote the adsorption and conversion of polysulfides in lithium-sulfur batteries. Energy Storage Materials.

Adsorption‐Catalysis Design in the Lithium‐Sulfur Battery

“…[62] Spired by good performance delivered by carbide with low cost, Huang and co-workers found another material (Mo 2 C) as catalyst and absorbent for LiPSs. [64] As the improvement of last work, they used the facile method to prepare the separator coated by Fe 3 C-N-doped reduced graphene oxide (Fe 3 C-N-rGO), which showed high electronic conductivity and adsorbed polysulfide effectively. Based on their experiment, they proposed that the accumulation of Mo 2 C nanoparticles could provide more active sites, which is significant for the catalytic process.…”

Insight into the Anchoring and Catalytic Effects of VO2 and VS2 Nanosheets as Sulfur Cathode Hosts for Li–S Batteries

“…In addition, high‐order lithium polysulfides (LiPSs, Li 2 S n , n =4, 6, or 8) formed during discharge are soluble in aprotic electrolytes. A portion of LiPSs shuttle to the Li‐metal anode and deposit there, resulting in rapid capacity decay …”

“…Nevertheless, carbon cannot be considered an excellent HM because of its weak physical confinement ability between polar LiPSs and nonpolar carbon . Recently, many other types of HMs, such as heteroatom‐doped carbons, transition‐metal oxides/sulfides/nitrides/carbides, and metal–organic frameworks, have remarkably improved the electrochemical performance of Li–S batteries because of the strong chemical interaction between LiPSs and HMs. In addition, the catalytic ability of these HMs can decrease the decomposition energy of Li 2 S, resulting in fast reaction kinetics …”

“…Ap ortion of LiPSs shuttle to the Li-metal anode and deposit there,r esulting in rapid capacity decay. [5,[7][8][9][10][11] Various strategies have been explored to address the aforementioned issues, including the use of Sh ost materials (HMs), [6,[12][13][14][15][16] coated separators, [17,18] interlayers, [19] and electrolyte additives. [20,21] To improvet he electronic conductivity of S electrodes, various carbon-based HMs, such as graphene, [22,23] mesoporousc arbon, [24,25] carbon nanotubes, [26,27] and carbon nanospheres, [28] have been intensively examined.…”

“…Moreover, these carbon HMs, with unique micron/nano architectures,n ot only mitigate the largev olume expansion of Sd uringl ithiation but also suppress LiPSs dissolution.N evertheless, carbon cannotb ec onsidered an excellent HM because of its weak physicalc onfinement ability between polar LiPSs and nonpolar carbon. [29] Recently,m any other types of HMs, such as heteroatom-doped carbons, [30,31] transition-metal oxides [4,10,32,33] /sulfides [16,[34][35][36][37][38] /nitrides [12,13] /carbides, [9,14,[39][40][41] and metal-organic frameworks, [1,[42][43][44] have remarkably improved the electrochemical performance of Li-S batteries because of the strongchemical interaction between LiPSs and HMs. In addition, the catalyt-Transition metal oxidesa nd sulfides have been intensively investigated as host materials fort he Sc athode in lithium-sulfur (Li-S) batteries; however,t he distinctions between them in battery operation have remained unclear.I nt his study,V O 2 and VS 2 nanosheets were systematically studied as host materials for Li-S batteries through theoretical calculations and experimental testing.…”