The sodium ion batteries (SIBs) are a promising candidate for large-scale energy storage owing to the abundance and low cost of sodium resources. However, the absence of suitable anode materials with desired rate capability and cycle stability is one of the bottlenecks for their commercialization. In this work, WS₂/Ni₃S₂@N-doped carbon composite (WS₂/Ni₃S₂@NC) was prepared by using a simple solvothermal approach with subsequent annealing approach. The material was used as anode material for SIBs. The batteries showed excellent performance due to the special bimetallic sulfide heterostructure, which could provide reaction active sites, promote fast Na ions diffusion, and increase electrode/electrolyte contact. In addition, the in-situ synthesized N-doped carbon layer could effectively improve the electronic conductivity as well as maintain structural stability. As anode of SIBs, the WS₂/Ni₃S₂@NC exhibits both excellent rate performance (329.6 mAh g⁻¹ at 0.1 A g⁻¹, and 129.6 mAh g⁻¹ at 5.0 A g⁻¹) and outstanding cycling stability (219.7 mAh g⁻¹ after 80 cycles at 0.1 A g⁻¹) due to the pseudocapacitive behavior.

由于钠资源丰富且成本低，钠离子电池（SIBs）是大规模储能的有希望的候选者。然而，缺乏具有所需倍率能力和循环稳定性的合适负极材料是其商业化的瓶颈之一。在这项工作中，WS ₂ /Ni ₃ S ₂ @ N掺杂的碳复合材料（WS ₂ /Ni ₃ S ₂@NC) 是通过使用简单的溶剂热方法和随后的退火方法制备的。该材料用作SIBs的阳极材料。由于特殊的双金属硫化物异质结构，电池表现出优异的性能，可以提供反应活性位点，促进钠离子的快速扩散，增加电极/电解质的接触。此外，原位合成的N掺杂碳层可以有效提高电子导电性并保持结构稳定性。作为SIBs的阳极，WS ₂ /Ni ₃ S ₂ @NC表现出优异的倍率性能（329.6 mAh g ^-1 at 0.1 A g ^-1和129.6 mAh g ^-1 at 5.0 A g ^-1）和出色的循环稳定性（219.7毫安克^-1 80个循环的0.1 A克后^-1由于赝电容行为）。