Investigation of electrochemical reaction mechanism for antimony selenide nanocomposite for sodium-ion battery electrodes

Antimony selenide and its carbon composite were synthesized through a mechanochemical process and investigated as anode materials for sodium-ion secondary batteries. X-ray diffraction (XRD) with rietveld refinement and transmission electron microscopy (TEM) analyses confirm that Sb 2 Se 3 were compo...

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Bibliographic Details
Published in:Journal of applied electrochemistry 2019-02, Vol.49 (2), p.207-216
Main Authors: Choi, Jeong-Hee, Lee, Min-Ho, Choi, Hae-Young, Park, Cheol-Min, Lee, Sang-Min, Choi, Jin-Hyeok
Format: Article
Language:English
Subjects:
Amorphization
Anodes
Antimony
Antimony compounds
Chemical synthesis
Chemistry
Chemistry and Materials Science
Crystals
Electrochemistry
Electrode materials
Electrodes
Industrial Chemistry/Chemical Engineering
Nanocomposites
Nanocrystals
Physical Chemistry
Reaction mechanisms
Rechargeable batteries
Recombination reactions
Research Article
Selenides
Sodium-ion batteries
Storage batteries
Transmission electron microscopy
X ray photoelectron spectroscopy
X-ray diffraction
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Summary:Antimony selenide and its carbon composite were synthesized through a mechanochemical process and investigated as anode materials for sodium-ion secondary batteries. X-ray diffraction (XRD) with rietveld refinement and transmission electron microscopy (TEM) analyses confirm that Sb 2 Se 3 were composed of agglomerated highly crystalline nanocrystallites and the Sb 2 Se 3 /C composite consisted of nanocrystalline Sb 2 Se 3 dispersed homogeneously throughout an amorphized carbon matrix. The initial Coulombic efficiency, rate capability, and cycle performance of the Sb 2 Se 3 /C composite were superior to those of Sb, or Sb 2 Se 3 . The Sb 2 Se 3 /C composite, in particular, showed excellent cycle stability, with 98.2% of initial capacity at 200 mA g −1 after 200 cycles. Based on the reaction potentials, ex situ XRD patterns and ex situ HR-TEM analysis of the Sb 2 Se 3 /C composite electrode revealed the structural changes which occurred reversibly within the Sb 2 Se 3 /C composite by conversion and recombination reaction during sodiation and desodiation process. Furthermore, XPS analysis study was carried out for identifying the surface films formed on both the electrodes and their effects on the performances. Graphical abstract
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-018-1267-2