Post-synthetically modified metal-porphyrin framework for carbon dioxide adsorption and energy storage in Li-S batteries

• Published in: RSC advances Vol. 12; no. 37; pp. 23989 - 242
• Main Authors: Király, Nikolas, Capková, Dominika, Almši, Miroslav, Kazda, Tomš, ech, Ondej, udek, Pavel, Fedorkov, Andrea Strakov, Lisnichuk, Maxim, Meynen, Vera, Zele ák, Vladimr
• Format: Journal Article
• Language: English
• Published: 24.08.2022
• ISSN: 2046-2069
• DOI: 10.1039/d2ra03301a

Lithium-sulphur batteries attract increasing interest due to their high theoretical specific capacity, advantageous economy, and "eco-friendliness". In this study, a metal-organic framework (MOF) GaTCPP containing a porphyrinic base ligand was used as a conductive additive for sulphur. GaTCPP was synthesized, characterized, and post-synthetically modified by the transition metal ions (Co 2+ /Ni 2+ ). The doping of GaTCPP ensured an increase in the carbon dioxide adsorption capacities, which were measured under different conditions. Post-synthetic modification of GaTCPP with Co 2+ /Ni 2+ ions has been shown to increase carbon dioxide storage capacity from 22.8 wt% for unmodified material to 23.1 wt% and 26.5 wt% at 0 C and 1 bar for Co 2+ and Ni 2+ -doped analogues, respectively. As a conductive part of cathode material, MOFs displayed successful sulphur capture and encapsulation proven by stable charge/discharge cycle performances, high-capacity retention, and coulombic efficiency. The electrodes with pristine GaTCPP showed a discharge capacity of 699 mA h g −1 at 0.2C in the fiftieth cycle. However, the doping of GaTCPP by Ni 2+ has a positive impact on the electrochemical properties, the capacity increased to 778 mA h g −1 in the fiftieth cycle at 0.2C. Metal-porphyrin framework GaTCPP was used for carbon dioxide adsorption and as a host for preparation of a Li-S battery cathode material.