Sadan Milan K, Kim Huihun, Kim Changhyeon, Cho Gyu-Bong, Cho Kwon-Koo, Ahn Jou-Hyeon, Ahn Hyo-Jun
Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju 52828, Republic of Korea.
Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Republic of Korea.
Nanoscale. 2021 Jun 17;13(23):10447-10454. doi: 10.1039/d1nr02133h.
Transition-metal sulfides have been extensively studied as anode materials for use in sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) due to their multi-electron reactions, high rate performance, and abundant available resources. However, the practical capacities of metal sulfides remain low due to conductivity issues, volume expansion, and the use of traditional carbonate electrolytes. To overcome these drawbacks, ether electrolytes can be combined with nanoparticle-based metal sulfide anodes. Herein, a nanoparticle-based nickel monosulfide (NiS) anode with high rate performance in the ether electrolytes of SIBs/PIBs was prepared by heating a mixture of nickel nanoparticles with sulfur. In SIBs, the NiS anode capacity was 286 mA h g-1 at a high current density of 100 A g-1, and excellent cycling performance was observed at 25 A g-1 with a capacity of 468 mA h g-1 after 1000 cycles. Moreover, a full-cell containing a Na3V2(PO4) cathode demonstrated a rate performance of 65 mA h g-1 at a high current density of 100 A g-1. In PIBs, the NiS electrode capacity was 642 and 37 mA h g-1 at 0.5 and 100 A g-1, respectively. Hence, the synthesised NiS nanoparticles possessed excellent storage capability, regardless of the alkali-ion type, suggesting their potential use as robust NiS anodes for advanced battery systems.
过渡金属硫化物因其多电子反应、高倍率性能和丰富的可用资源，已被广泛研究用作钠离子电池（SIBs）和钾离子电池（PIBs）的负极材料。然而，由于导电性问题、体积膨胀以及传统碳酸盐电解质的使用，金属硫化物的实际容量仍然较低。为了克服这些缺点，可以将醚类电解质与基于纳米颗粒的金属硫化物负极相结合。在此，通过加热镍纳米颗粒与硫的混合物，制备了一种在SIBs/PIBs的醚类电解质中具有高倍率性能的基于纳米颗粒的硫化镍（NiS）负极。在SIBs中，NiS负极在100 A g-1的高电流密度下容量为286 mA h g-1，在25 A g-1下观察到优异的循环性能，1000次循环后容量为468 mA h g-1。此外，包含Na3V2(PO4)正极的全电池在100 A g-1的高电流密度下倍率性能为65 mA h g-1。在PIBs中，NiS电极在0.5和100 A g-1下的容量分别为642和37 mA h g-1。因此，合成的NiS纳米颗粒无论碱金属离子类型如何，都具有优异的存储能力，表明它们有潜力用作先进电池系统中坚固的NiS负极。
