The composite of carbon materials and transition metal sulfides can significantly improve the poor cycling performance of transition metal sulfides in sodium storage. In this study, the nitrogen/sulfur co-doped three-dimensional graphene (NSGN) encapsulating transition metal sulfides (FeS, Co₉S₈ and Ni₃S₂) are designed in a general method to improve the poor cycling stability of transition metal sulfides. The desired anode materials all show an excellent cyclic stability with the capacity retention of 63%, 97% and 98% after 100 cycles in sodium-ion batteries for FeS@NSGN, Co₉S₈@NSGN and Ni₃S₂@NSGN electrodes, respectively. Consequently, this work can provide a new insight for in-situ synthesis of metal sulfides and graphene composites to improve the performance of sodium storage.

碳材料和过渡金属硫化物的复合材料可以显着改善过渡金属硫化物在钠储存中的不良循环性能。在这项研究中，采用通用方法设计了氮/硫共掺杂三维石墨烯（NSGN）封装的过渡金属硫化物（FeS，Co ₉ S ₈和Ni ₃ S ₂），以改善过渡金属的不良循环稳定性硫化物。所需的阳极材料均显示出优异的循环稳定性，在FeS @ NSGN，Co ₉ S ₈ @NSGN和Ni ₃ S _2的钠离子电池中经过100次循环后，容量保持率分别为63％，97％和98％@NSGN电极。因此，这项工作可以为金属硫化物和石墨烯复合材料的原位合成提供新的见解，从而改善钠存储性能。