Design of 3D Metal-Organic Material with Multiple Redox-Active Sites for High-Performance Lithium-Ion Batteries

To meet the challenges of poor cycling performance andlow specificcapacity of organic electrode materials, an example of a three-dimensionalmanganese-based coordination polymer [Mn-2(pztc)(H2O)(2)]( n ) (Mn-3D) was synthesizedby a simple hydrothermal reaction using a redox-active organic moietypyrazine-2,3,5,6-tetracarboxylic acid (H(4)pztc) as the linker.The Mn-3D anode material exhibited excellent lithium storage capacityto store 14 lithium ions, with a high theoretical specific capacityof 942 mA h g(-1) based on density functional theory.Owing to the coordination bonds between the redox-active ligand andthe metal center, Mn-3D delivered high electrolyte stability and electricalconductivity and thus the anode material could exhibit superior cyclingperformance with a superior reversible capacity of 692 mA h g(-1) after 160 cycles at 100 mA g(-1).Experimental and theoretical analyses revealed the reversibility ofthe lithium storage active sites in Mn-3D during cycling. This workhighlights the significance of the design of redox-active metal-organicmaterials as high-performance anodes of lithium-ion batteries.

Automated summary

A three-dimensional manganese-based coordination polymer, Mn-3D, was synthesized as a high-performance anode material for lithium-ion batteries. It exhibited excellent lithium storage capacity and cycling performance.