Boosting Lithium Storage of a Metal-Organic Framework Via Zinc Doping

Lithium-ion batteries (LIBs) as a predominant power source are widely used in large-scale energy storage fields. For the next generation energy storage LIBs, it is primary to seek the high capacity and long life span electrode materials. Nickel-based metal-organic frameworks with a series amounts of zinc dopant (0, 20, 50%) are successfully synthesized in this work and evaluated as anode materials for lithium-ion batteries. Among them, the 20 at.% (atom percentage) Zn-doped Ni-PTA (Zn 0.2 -Ni-PTA) exhibits a high specific capacity of 921.4 mA h g -1 and 739.6 mA h g -1 at different current density of 50, 500 mA g -1 after 100 cycles. The optimized electrochemical performance of Zn 0.2 -Ni-PTA can be attributed to its low charge transfer resistance and high lithium-ion diffusion rate after Zn doping. Moreover, a full cell is fabricated based on LiFePO 4 cathode and as-prepared MOF. The Zn 0.2 -Ni-PTA shows a reversible specific capacity of 97.9 mA h g -1 with 86.1% capacity retention (0.5C) after 100 cycles, demonstrating the superior electrochemical performance of Zn 0.2 -Ni-PTA anode as a promising candidate for practical lithium-ion batteries