High-performance electrodes for Li-ion cell: Heteroatom-doped porous carbon/CoS structure and investigation of their structural and electrochemical properties
INTERNATIONAL JOURNAL OF ENERGY RESEARCH, vol.46, no.13, pp.18379-18393, 2022 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 46 Issue: 13
- Publication Date: 2022
- Doi Number: 10.1002/er.8452
- Journal Name: INTERNATIONAL JOURNAL OF ENERGY RESEARCH
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Communication Abstracts, Compendex, Environment Index, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
- Page Numbers: pp.18379-18393
- Keywords: Li-ion battery, porous carbon, ZIF, METAL-ORGANIC FRAMEWORKS, OXYGEN REDUCTION, ANODE MATERIAL, GRAPHENE OXIDE, HYDROTHERMAL SYNTHESIS, NANOPOROUS CARBONS, LITHIUM BATTERIES, AMORPHOUS-CARBON, FACILE SYNTHESIS, NANOPARTICLES
- Inonu University Affiliated: Yes
Abstract
As an essential class of anode materials, the synthesis and characterization of CoS@ZIF-12-C composite anode materials are reported. The two-step synthesis of CoS nanoparticles embedded in N-doped porous carbon by using a metal-organic framework (MOF) as the template. After structural characterization of CoS@ZIF-12-C composite materials, the main phase was found as CoS with symmetry of P63mmc. Benefiting from the CoS embedded in porous carbon structure, the half Li-ion battery cell tests of CoS@ZIF-12-C composite materials were performed by a 2-electrode method using CR2032 cells, and the capacities of the cells were measured for 200 cycles using 300 mAg(-1) and 500 cycles using 1000 mAg(-1). The first discharge capacities of the cells for 1000 mAg(-1) were found as 458, 1178, and 815 mAhg(-1) for CoS@ZIF-12-C-T, T = 700, 800, and 900 degrees C, respectively. An unexpected capacity increase was observed for the CoS@ZIF-12-C-700 and CoS@ZIF-12-C-900 half cells during the cycling. Ex-situ x-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and cyclic voltammetry (CV) analysis were performed after cycling of the cells for explanations of the capacity increase. Ex-situ XRD analysis of these cells showed phase transitions from crystalline to amorphous type structure, and ex-situ FTIR proves the preservation of the CoS phase during the cycling. A redox reaction mechanism was suggested to explain the cells' battery performance by ex-situ XRD analysis.