Multi-thiol-supported dicarboxylate-based metal-organic framework with excellent performance for lithium-ion battery

With the reversible two-electron redox reaction, dicarboxylates have been widely employed as advanced anodes for lithium-ion batteries. However, dicarboxylate-based anodes always displayed limited capacities, low rate performances, and poor long-cycle abilities due to their inevitable dissolution in the electrolyte. Here, to address the above-motioned issues, a functional multi-thiol-supported dicarboxylate-based metal-organic framework, namely Fe-TTTP, is synthesized and employed as a promising anode for lithium-ion batteries based on the redoxactive Iron (III) ions and organic dicarboxylate ligands. Benefiting from its chemical structure with multiple redox metal-centers, high theoretical specific capacity, and insolubility, Fe-TTTP gains superior electrochemical performances, including a high reversible (charge) capacity of 950 mAh g(-1) at 50 mA g(-1), excellent rate performance (95 mAh g(-1) up to 10000 mA g(-1), 1.1 min for each cycle), and extraordinary cycling stability (310 & PLUSMN; 20 mAh g(-1) for 5000 cycles at 2000 mA g(-1)).

Automated summary

In this study, a functional metal-organic framework material Fe-TTTP was synthesized and used as an anode for lithium-ion batteries. The Fe-TTTP anode exhibited high reversible capacity, excellent rate performance, and extraordinary cycling stability.