Single‐Layered MoS2 Fabricated by Charge‐Driven Interlayer Expansion for Superior Lithium/Sodium/Potassium‐Ion‐Battery Anodes

• Published in: Advanced science Vol. 10; no. 15; pp. e2207234 - n/a
• Main Authors: Li, Zhenwei, Han, Meisheng, Zhang, Yuanbo, Yuan, Fu, Fu, Ying, Yu, Jie
• Format: Journal Article
• Language: English
• Published: Weinheim John Wiley & Sons, Inc 01.05.2023; John Wiley and Sons Inc; Wiley
• Subjects: Carbon; charge‐driven interlayer expansion; Co doping; Electrodes; Expansion; Graphene; Graphite; Ions; Li/Na/K‐ion batteries; Lithium; Nanoparticles; Potassium; single‐layered MoS2; spin‐polarized surface capacitance
• ISSN: 2198-3844; 2198-3844
• DOI: 10.1002/advs.202207234

Single‐layered MoS2 is a promising anode material for lithium‐ion batteries (LIBs), sodium‐ion batteries (SIBs), and potassium‐ion batteries (PIBs) due to its high capacity and isotropic ion transport paths. However, the low intrinsic conductivity and easy‐agglomerated feature hamper its applications. Here, a charge‐driven interlayer expansion strategy that Co2+ replaces Mo4+ in the doping form to endow MoS2 layers with negative charges, thus inducing electrostatic repulsion, together with the insertion of gaseous groups, to drive interlayer expansion which once breaks the confinement of interlayer van der Waals force, single‐layered MoS2 is obtained and uniformly dispersed into carbon matrix arising from the transformation of carbonaceous gaseous groups under high vapor pressure, is proposed. Co atom doping helps enhance the intrinsic conductivity of single‐layered MoS2. Carbon matrix effectively prevents agglomeration of single‐layered MoS2. The doped Co atoms can be fully transformed into ultrasmall Co nanoparticles during conversion reaction, which enables strong spin‐polarized surface capacitance and thus significantly boosts ion transport and storage. Consequently, the prepared material delivers superb Li/Na/K‐ion storage performances, which are best in the reported MoS2‐based anodes. The proposed charge‐driven interlayer expansion strategy provides a novel perspective for preparing single‐layered MoS2, which shows huge potential for energy storage. Single‐layered MoS2 has great potential in energy storage but suffers from low intrinsic conductivity and easy‐agglomerated feature. Here, a charge‐driven interlayer expansion strategy is proposed. The interlayer electrostatic repulsion induced by Co doping breaks the interlayer van der Waals force to fabricate Co‐doped single‐layered MoS2, which uniformly disperses in carbon matrix and shows superior lithium/sodium/potassium‐ion transport and storage capability.