材料科学
硫化
阳极
化学工程
电化学
纳米技术
纳米颗粒
电子转移
电极
硫黄
化学
冶金
有机化学
物理化学
工程类
作者
Qingping Li,Ransha Deng,Yuxiang Chen,Jinke Gong,Peng Wang,Qiaoji Zheng,Yujing Huo,Fengyu Xie,Xiupeng Wei,Chenhui Yang,Dunmin Lin
出处
期刊:Small
[Wiley]
日期:2023-06-15
卷期号:19 (42)
被引量:26
标识
DOI:10.1002/smll.202303642
摘要
Nickel sulfides with high theoretical capacity are considered as promising anode materials for sodium-ion batteries (SIBs); however, their intrinsic poor electric conductivity, large volume change during charging/discharging, and easy sulfur dissolution result in inferior electrochemical performance for sodium storage. Herein, a hierarchical hollow microsphere is assembled from heterostructured NiS/NiS2 nanoparticles confined by in situ carbon layer (H-NiS/NiS2 @C) via regulating the sulfidation temperature of the precursor Ni-MOFs. The morphology of ultrathin hollow spherical shells and confinement of in situ carbon layer to active materials provide rich channels for ion/electron transfer and alleviate the effects of volume change and agglomeration of the material. Consequently, the as-prepared H-NiS/NiS2 @C exhibit superb electrochemical properties, satisfactory initial specific capacity of 953.0 mA h g-1 at 0.1 A g-1 , excellent rate capability of 509.9 mA h g-1 at 2 A g-1 , and superior longtime cycling life with 433.4 mA h g-1 after 4500 cycles at 10 A g-1 . Density functional theory calculation shows that heterogenous interfaces with electron redistribution lead to charge transfer from NiS to NiS2 , and thus favor interfacial electron transport and reduce ion-diffusion barrier. This work provides an innovative idea for the synthesis of homologous heterostructures for high-efficiency SIB electrode materials.
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