Issue 15, 2022

Thermally fabricated cobalt telluride in nitrogen-rich carbon dodecahedra as high-rate potassium and sodium ion battery anodes

Abstract

Cobalt telluride anchored to nitrogen-rich carbon dodecahedra (CoTe@NCD) was synthesized by simultaneous pyrolysis-tellurium melt impregnation of ZIF-67 MOFs. The purely thermal method involved no secondary chemicals and no waste byproducts. The result is a microstructure consisting of nanoscale 86 wt% CoTe intermetallic nanoparticles contained within a thin N-rich carbon matrix. During electrochemical cycling, the 21 nm average diameter CoTe provides short diffusion paths for Na+/K+ ions, which in conjunction with the electrically conducting carbon matrix allow for rapid potassiation or sodiation. As potassium ion battery (PIB and KIB) and sodium ion battery (NIB and SIB) anodes, CoTe@NCD demonstrates attractive reversible capacity, promising cycling stability, and state-of-the-art rate performance. For example, as a KIB anode, the CoTe@NCD electrode exhibits a reversible capacity of 380 mA h g−1 at 50 mA g−1 and a fast charge capacity of 136 mA h g−1 at 1000 mA g−1. As a NIB anode, it also displays excellent rate capability achieving 620 mA h g−1 at 50 mA g−1 and 345 mA h g−1 at 1000 mA g−1.

Graphical abstract: Thermally fabricated cobalt telluride in nitrogen-rich carbon dodecahedra as high-rate potassium and sodium ion battery anodes

Supplementary files

Article information

Article type
Paper
Submitted
28 2月 2022
Accepted
14 6月 2022
First published
14 6月 2022

Sustainable Energy Fuels, 2022,6, 3582-3590

Author version available

Thermally fabricated cobalt telluride in nitrogen-rich carbon dodecahedra as high-rate potassium and sodium ion battery anodes

D. Sarkar, D. Das, S. Nagarajan and D. Mitlin, Sustainable Energy Fuels, 2022, 6, 3582 DOI: 10.1039/D2SE00267A

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