Rational design of exfoliated 1T MoS₂@CNT-based bifunctional separators for lithium sulfur batteries

Abstract

1T exfoliated MoS2@CNT-based bifunctional separators in a tandem configuration delivered excellent electrochemical performance, and rational guidelines for preparing bifunctional separators for lithium sulfur batteries were suggested.

Two‐Dimensional Material‐Functionalized Separators for High‐Energy‐Density Metal–Sulfur and Metal‐Based Batteries

“…On the other side, researchers applied the metallic (1T) phase MoS 2 rather than the normals emicon-ducting( 2H)p hase MoS 2 as the interlayer,w hich had much bettere lectron conductivity than the 2H phase MoS 2 . [51] The 1T phase MoS 2 exhibited around6 70 mAh g À1 capacity after 500 cycles under 1C rate. There was considerable variation in absorption between semiconducting phase (2 H) andm etallic phase (1T) of MoS 2 towards PS based on DFT simulation (see Figure 5b,d).…”

“…Soluble PS diffused from dark PS-containing electrolyte in the right to the left vial through the a) PP separatora nd b) 1T-MoS 2 functional interlayer for 24 hours. [51] c) SEM images of Li metali nPPa nd functional separators. [47] d) Infiltration of the electrolyte on PP separator,f unctional separators with the corresponding contact angels and e) their thermal stability (treated 2min at 150 8C).…”

Two‐Dimensional MoS2 for Li−S Batteries: Structural Design and Electronic Modulation

“…[35,86] For instance, Jeong et al reported that the electrochemical performance of MoS 2 wass trongly dependent on its phase, if usedf or LiÀSb atteries. [87] Theoretical analysis indicates that both 1T MoS 2 and 2H MoS 2 have strongi nteractions with the soluble polysulfide species (Figure 12 a). Although the interaction energies of adsorption toward Li 2 S 4 and Li 2 S 6 are similar for 2H and 1T MoS 2 ,t he 1T MoS 2 phase performs better than that of 2H MoS 2 because of improved surface reactionk inetics.…”

“…Reproduced with permission. [87] Copyright 2017, The RoyalS ociety of Chemistry.b)Aschematic illustration of the conversion of LiPSs on 1T MoS 2 /graphenea nd the measured cycling performanceoft he Li 2 S 6 cathode. Reproducedw ith permission.…”

Defect Control in the Synthesis of 2 D MoS2 Nanosheets: Polysulfide Trapping in Composite Sulfur Cathodes for Li–S Batteries

“…[29] These can be generalized into three strategies using MoS 2 :p rotection by augmenting the separator,t he Li-metala node, and PS trapping by inclusion in ac omposite cathode. Specific examples have included use of MoS 2 as as eparator coating, [30][31][32][33][34][35] as ap rotective layer on the anode, [36,37] and inclusion in ac omposite cathode. This composite cathode is generally fabricated using ac arbonbased support, such as ag raphene nanosheet, [23] carbon cloth, [38] reduced graphene oxide, [39][40][41][42] or an itrogen-doped support such as carbon nanotubes (CNTs), [35] mesoporous carbon spheres, [38] reduced graphene oxide, [43] or porous carbon.…”