Liu Guilong, Xu Mingyuan, Cao Ruping, Zhao Zihan, Yuan Wenzhuo, Liu Yong, Cao Ang, Wang Lijuan, Liu Xianming
Luoyang Key Laboratory of Green Energy Materials, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, PR China.
Luoyang Key Laboratory of Green Energy Materials, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, PR China; College of Petroleum and Chemical Technology, Liaoning Petrochemical University, Fushun 113001, PR China.
J Colloid Interface Sci. 2025 Oct;695:137801. doi: 10.1016/j.jcis.2025.137801. Epub 2025 May 5.
SnS with high theoretical capacity, large lamellar spacing, and favorable voltage plateau is considered as a highly prospective anode material for sodium-ion batteries (SIBs). Nevertheless, the unsatisfied intrinsic conductivity and damaging volume variation during cycles restricted its specific capacity and potential application. In this work, a synergistic sodium storage of interfacial engineering and NaS adsorption was proposed to boost the electrochemical kinetics of SnS by vertically growing SnS@C nanosheets on MBenes. The experimental and theoretical calculation results verified that the nanosheets, heterogeneous interface, and charge transfer between MoBT and SnS offered rapid ion diffusion pathways and ameliorated the intrinsic conductivity, promoting the electrochemical kinetics. The sufficient sulfur vacancies and strong adsorption ability of NaS on MBenes provided supplementary active sites for ion adsorption and suppressed the shuttle effect of NaS, improving the electrochemical capacity and reversibility. Consequently, the MBenes-SnS@C anode delivered high capacities of 411 mAh g at 1 A g and 420 mAh g after 100 cycles at 0.5 A g. The synergistic sodium storage mechanism arising from interfacial effects and NaS adsorption offered novel insights for the rational design of high-performance transition metal sulfide anodes for SIBs.
具有高理论容量、大层间距和良好电压平台的硫化亚锡被认为是钠离子电池（SIBs）极具前景的负极材料。然而，其本征电导率不理想以及循环过程中有害的体积变化限制了其比容量和潜在应用。在这项工作中，提出了一种界面工程和硫化钠吸附协同储钠的方法，通过在MBenes上垂直生长硫化亚锡@碳纳米片来促进硫化亚锡的电化学动力学。实验和理论计算结果证实，纳米片、异质界面以及钼硼烯与硫化亚锡之间的电荷转移提供了快速的离子扩散途径，改善了本征电导率，促进了电化学动力学。硫化钠在MBenes上充足的硫空位和强吸附能力为离子吸附提供了补充活性位点，并抑制了硫化钠的穿梭效应，提高了电化学容量和可逆性。因此，MBenes-硫化亚锡@碳负极在1 A g时提供了411 mAh g的高容量，在0.5 A g下循环100次后容量为420 mAh g。由界面效应和硫化钠吸附产生的协同储钠机制为高性能过渡金属硫化物负极用于钠离子电池的合理设计提供了新的见解。
