Due to the growing demand in the energy market, sodium-ion batteries (SIBs) have garnered significant attention as potential energy storage devices for large-scale applications. However, the sluggish kinetics and significant volume expansion during cycling bring about the poor electrochemical behavior of SIBs. In this work, a dual carbon including internal hard carbon core and external N-doped carbon shell confined MoS₂ hierarchical microspheres (HC@MoS₂@NC) nanocomposites are prepared as anode for SIBs with superior cycling stability and good rate capability. The dual carbon confinement can improve the structural stability of MoS₂. The dual carbon with good electronic conductivity ensures well battery rate capability of MoS₂ anode. Meanwhile, the larger interlayer spacing of 10.09 Å caused by NC insertion make MoS₂ store more Na⁺. As a consequence, the HC@MoS₂@NC nanocomposite delivers a high capacity of 321 mAh g⁻¹ at 0.1 A g⁻¹ after 100 cycles. At large current density of 2 A g⁻¹, a high capacity of 180 mAh g⁻¹ can still be achieved after 1000 cycles. Even at larger current density of 5 A g⁻¹, the capacity can still be kept at 162 mAh g⁻¹ after 100 cycles.

由于能源市场需求的不断增长，钠离子电池（SIB）作为大规模应用的潜在储能设备受到了广泛关注。然而，循环过程中缓慢的动力学和显着的体积膨胀导致SIB的电化学行为较差。在这项工作中，制备了一种包含内部硬碳核和外部氮掺杂碳壳限制的MoS ₂分级微球（HC@MoS ₂ @NC）纳米复合材料作为SIBs的阳极，具有优异的循环稳定性和良好的倍率性能。双碳约束可以提高MoS _{2的结构稳定性}。双碳具有良好的电子导电性，保证了MoS _{2负极良好的电池倍率性能}。同时，NC插入导致10.09 Å的较大层间距使MoS ₂储存更多的Na ⁺。因此，HC@MoS ₂ @NC纳米复合材料在100次循环后在0.1 A g ^{-1下提供了321 mAh g -1}的高容量。在2 A g ^-1的大电流密度下， 1000次循环后仍能实现180 mAh g ^-1的高容量。即使在5 A g ^-1的较大电流密度下，100次循环后容量仍能保持在162 mAh g ^-1。