Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, P. R. China.
Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Shenzhen Engineering Lab for Supercapacitor Materials, School of Material Science and Engineering, Harbin Institute of Technology, Shenzhen University Town, Shenzhen, 518055, P. R. China.
Adv Sci (Weinh). 2023 May;10(15):e2207234. doi: 10.1002/advs.202207234. Epub 2023 Mar 22.
Single-layered MoS 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 Co replaces Mo in the doping form to endow MoS 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 MoS 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 MoS . Carbon matrix effectively prevents agglomeration of single-layered MoS . 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 MoS -based anodes. The proposed charge-driven interlayer expansion strategy provides a novel perspective for preparing single-layered MoS which shows huge potential for energy storage.
单层 MoS 由于其高容量和各向同性的离子传输路径，是锂离子电池 (LIB)、钠离子电池 (SIB) 和钾离子电池 (PIB) 的一种很有前途的阳极材料。然而，其低的本征电导率和易团聚的特性阻碍了它的应用。在这里，提出了一种电荷驱动的层间膨胀策略，即 Co 以掺杂的形式取代 Mo，赋予 MoS 层负电荷，从而产生静电排斥，同时插入气态基团，驱动层间膨胀，从而打破层间范德华力的限制，得到单层 MoS，并均匀分散到碳基体中，这是由于在高压蒸汽下碳质气态基团的转化。Co 原子掺杂有助于提高单层 MoS 的本征电导率。碳基体有效地防止了单层 MoS 的团聚。在转化反应中，掺杂的 Co 原子可以完全转化为超小的 Co 纳米粒子，这使得强自旋极化表面电容，从而显著提高离子传输和存储。因此，所制备的材料表现出优异的 Li/Na/K 离子存储性能，在报道的基于 MoS 的阳极中是最好的。所提出的电荷驱动的层间膨胀策略为制备单层 MoS 提供了新的视角，在储能方面显示出巨大的潜力。
