SnS is a promising anode material for sodium-ion batteries (SIBs) due to its high theoretical specific capacity, but the poor intrinsic conductivity, bulk expansion and shuttle effects brought by polysulfides seriously limit its practical use. Here, soft/rigid SnS&TiS₂ compounds with carbon nanotubes (ST@CNTs) is designed to overcome the shortcomings. The rigid TiS₂, as the strong backbone of SnS&TiS₂, relieves the expansion stress caused by SnS after sodiation, together with CNTs improve the materials conductivity. TiS₂ generates many sulfur defects under the synergistic effect of SnS, which can regulate the sodium-ion embedding sites to stabilize the compound structure and decrease the sodium-ion diffusion energy barrier. Moreover, rigid TiS₂ can adsorb polysulfides induced by SnS, thus suppresses the shuttle effect and improves the cycling and rate performances. Fortunately, the above conclusions are confirmed by the DFT calculations. The ST@CNTs provide a specific capacity of 550 mAh/g at 1.0 A/g after 300 cycles, and a high-rate capability of 443 mAh/g at 2.0 A/g. This soft/rigid misfit strategy combines the advantages of high modulus of rigid layers and high sodium-ion storage capacity of soft layers, which gives an idea for the development of new anode candidates for SIBs.

SnS因其较高的理论比容量而成为一种很有前景的钠离子电池（SIBs）负极材料，但多硫化物带来的较差的本征电导率、体积膨胀和穿梭效应严重限制了其实际应用。在这里，软/硬 SnS&TiS ₂与碳纳米管的化合物 (ST@CNTs) 被设计来克服这些缺点。刚性的TiS _{2作为SnS&TiS 2}的强骨架，缓解了钠化后SnS引起的膨胀应力，与CNT一起提高了材料的导电性。硫化钛₂在SnS的协同作用下产生许多硫缺陷，可以调节钠离子嵌入位点以稳定化合物结构并降低钠离子扩散能垒。此外，刚性TiS ₂可以吸附SnS诱导的多硫化物，从而抑制穿梭效应，改善循环和倍率性能。幸运的是，上述结论得到了DFT计算的证实。ST@CNT在300次循环后在1.0 A/g下提供550 mAh/g的比容量，在2.0 A/g下提供443 mAh/g的高倍率容量。这种软/刚性错配策略结合了刚性层高模量和软层高钠离子存储容量的优点，为开发新型SIB阳极候选材料提供了思路。