| Autor: |
Ren, Manman, Zang, Haoting, Cao, Shilei, Liu, Weiliang, Li, Mei, Yao, Jinshui, Cai, Feipeng, Cui, Jiaxi, Wang, Yuanhao |
| Zdroj: |
Jouranl of Energy Storage; March 2024, Vol. 81 Issue: 1 |
| Abstrakt: |
Due to the ideal theoretical capacity, high initial coulombic efficiency, satisfactory electronic conductivity, and environmental friendliness, iron-based selenides have been intensively explored and developed as anodes for sodium-ion batteries (SIBs). However, they still face numerous obstacles in the commercialization process, such as large volume changes. In this work, a nanocomposite of Fe3Se4decorated carbon nanotubes (Fe3Se4/CNTs) was designed and prepared through a simple solvothermal method and subsequent selenization process. SEM and TEM images manifest that the Fe3Se4nanoparticles are well anchored to the two-dimensional CNTs. In the composite, Fe3Se4can provide high sodium storage capacity, meanwhile, CNTs acts as a self-supporting framework, which effectively enhances the electronic conductivity and mitigates the drastic volume expansion of Fe3Se4/CNTs electrode during electrochemical process. Thus, the Fe3Se4/CNTs electrode presents satisfactory sodium storage capacity and cycling stability. At 1 A g−1, it delivers a high capacity of 424 mA h g−1after 500 cycles, with a superior capacity retention of ~100 %. In addition, cyclic voltammetry (CV), galvanostatic intermittent titration (GITT), and ex-situX-ray diffraction (XRD) were employed to analyze the sodium storage mechanism and sodium ion diffusion ability in the Fe3Se4/CNTs electrode. This work provides an effective method for developing high-performance anodes for SIBs. |
| Databáze: |
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