用还原氧化石墨烯诱导双金属硫化物生长用于高性能钠存储。
Induced bimetallic sulfide growth with reduced graphene oxide for high-performance sodium storage.
机构信息
State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, PR China.
Key Laboratory for New Functional Materials of Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, PR China.
出版信息
J Colloid Interface Sci. 2023 Jul 15;642:554-564. doi: 10.1016/j.jcis.2023.03.207. Epub 2023 Apr 3.
Metal sulfide has been considered an ideal sodium-ion battery (SIB) anode material based on its high theoretical capacity. Nevertheless, the inevitable volume expansion during charge-discharge processes can lead to unsatisfying electrochemical properties, which limits its further large-scale application. In this contribution, laminated reduced graphene oxide (rGO) successfully induced the growth of SnCoS particles and self-assembled into a nanosheet-structured SnCoS@rGO composite through a facile solvothermal procedure. The optimized material can provide abundant active sites and facilitate Na ion diffusion due to the synergistic interaction between bimetallic sulfides and rGO. As the anode of SIBs, this material maintains a high capacity of 696.05 mAh g at 100 mA g after 100 cycles and a high-rate capability of 427.98 mAh g even at a high current density of 10 A g. Our rational design offers valuable inspiration for high-performance SIB anode materials.
金属硫化物因其高理论容量而被认为是一种理想的钠离子电池（SIB）的阳极材料。然而，在充放电过程中不可避免的体积膨胀会导致其电化学性能不佳，从而限制了其进一步的大规模应用。在本研究中，通过简便的溶剂热法，层状还原氧化石墨烯（rGO）成功地诱导了 SnCoS 颗粒的生长，并自组装成纳米片结构的 SnCoS@rGO 复合材料。优化后的材料由于双金属硫化物和 rGO 的协同作用，可以提供丰富的活性位点并促进 Na 离子扩散。作为 SIB 的阳极材料，该材料在 100 mA g 的电流密度下经过 100 次循环后仍保持 696.05 mAh g 的高容量，在 10 A g 的高电流密度下仍具有 427.98 mAh g 的高倍率性能。我们的合理设计为高性能 SIB 阳极材料提供了有价值的启示。
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