Rational design of heterostructured bimetallic sulfides (CoS2/NC@VS4) with VS4 nanodots decorated on CoS2 dodecahedron for high-performance sodium and potassium ion batteries

• Published in: Journal of colloid and interface science Vol. 625; pp. 41 - 49
• Main Authors: Li, Xiaotong, Liang, Huajian, Qin, Binyang, Wang, Mengqi, Zhang, Yufei, Fan, Haosen
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.11.2022
• Subjects: anodes; carbon; CoS2/NC@VS4; electrochemistry; electron transfer; hot water treatment; potassium; Potassium-ion batteries; sodium; Sodium-ion batteries; sulfides; synergism; vanadium; VS4 nanodots; ZIF-67; CoS2/NC@VS4; VS4 nanodots; Sodium-ion batteries; ZIF-67; Potassium-ion batteries
• ISSN: 0021-9797; 1095-7103; 1095-7103
• DOI: 10.1016/j.jcis.2022.05.155

[Display omitted] Developing electrode materials with desirable electrochemical properties for sodium and potassium ion batteries remains a tremendous challenge. Herein, hetero-structured hybrids with VS4 nanodots decorated on CoS2/NC dodecahedron (CoS2/NC@VS4) have been successfully synthesized through employing a cobalt-based imidazolate framework (ZIF-67) as a template to prepare CoS2/NC inner core. Then VS4 nanodots was then grown on the surface of CoS2/NC by hydrothermal method to construct a heterostructure. This heterogeneous structure facilitates full contact with the electrolytes and shortens electrons and ions diffusion distance. Besides, the nitrogen-doped carbon framework derived from ZIF-67 promotes electron transport and gives a reliable shield to buffer the volume swelling during discharge and charge processes. Driving by the synergistic effect of bimetallic sulfides and the multiple valence states vanadium sulfide, CoS2/NC@VS4 exhibits outstanding rate capability and stable cycle performance as the anode for SIBs and PIBs, including a specific capacity of 307 mAh g−1 at the current density of 1.0 A g−1 after 700 cycles for SIBs and a capacity of 291.54 mAh g−1 at the current density of 1.0 A g−1 after 430 cycles in PIBs.