Unraveling Chirality-Induced Spin Selectivity Effect in Hybrid Chiral MoS2 for Spin-Resolved Sulfur Redox Chemistry
Daye Lee1, Changhoon Choi2, Jeongyoub Lee3
1Department of Battery-Smart Factory, Korea University, Seoul 02841, South Korea.
Abstract:
Lithium-sulfur batteries (LSBs) promise high energy density but face critical challenges owing to sluggish sulfur redox kinetics and uncontrolled lithium polysulfide (LiPS) shuttling. Here, we demonstrate that chiral materials directly enhance LSB performance. By intercalating chiral methylbenzylamine (MBA) molecules into MoS2 layers, R-ChiMoS2 is synthesized, which stabilizes the metastable 1T phase and enables spin-selective electron transport through the chirality-induced spin selectivity (CISS) effect. The modified structure exhibits expanded interlayer spacing and coexisting 1T/2H domains, offering abundant active sites and stronger LiPS binding. As a result, R-ChiMoS2 accelerates sulfur reduction and oxidation reactions, lowers the Li2S nucleation barrier, and improves Li+ diffusion compared with bulk 2H or racemic counterparts. Incorporation of R-ChiMoS2@carbon nanotubes (CNTs) into separators further enhances conductivity and ensures durable LiPS blocking. Consequently, the resulting LSBs deliver high reversible capacity, outstanding rate capability up to 5.0 C, and long-term cycling stability under high sulfur-loading conditions. This study highlights chirality engineering as an effective design strategy for regulating spin-selective charge transport and advancing electrochemical energy storage performance.
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