Gou Wenshan, Xu Zhao, Lin Xueyu, Sun Yifei, Han Xuguang, Liu Mengmeng, Zhang Yan
Institute of Advanced Cross-Field Science, College of Life Sciences, Qingdao University, Qingdao 200671, China.
Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Materials (Basel). 2022 Jun 13;15(12):4186. doi: 10.3390/ma15124186.
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 lifespan electrode materials. Nickel and purified terephthalic acid-based MOF (Ni-PTA) 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% atom fraction Zn-doped Ni-PTA (Zn-Ni-PTA) exhibits a high specific capacity of 921.4 mA h g and 739.6 mA h g at different current densities of 100 and 500 mA g after 100 cycles. The optimized electrochemical performance of Zn-Ni-PTA can be attributed to its low charge transfer resistance and high lithium-ion diffusion rate resulting from expanded interplanar spacing after moderate Zn doping. Moreover, a full cell is fabricated based on the LiFePO cathode and as-prepared MOF. The Zn-Ni-PTA shows a reversible specific capacity of 97.9 mA h g with 86.1% capacity retention (0.5 C) after 100 cycles, demonstrating the superior electrochemical performance of Zn-Ni-PTA anode as a promising candidate for practical lithium-ion batteries.
锂离子电池（LIBs）作为一种主要的电源，被广泛应用于大规模储能领域。对于下一代储能锂离子电池而言，寻找高容量和长寿命的电极材料至关重要。在这项工作中，成功合成了具有一系列锌掺杂量（0%、20%、50%）的镍与对苯二甲酸基MOF（Ni-PTA），并将其评估为锂离子电池的负极材料。其中，20%原子分数锌掺杂的Ni-PTA（Zn-Ni-PTA）在100次循环后，在100和500 mA g的不同电流密度下分别表现出921.4 mA h g和739.6 mA h g的高比容量。Zn-Ni-PTA优化后的电化学性能可归因于适度锌掺杂后其晶面间距扩大导致的低电荷转移电阻和高锂离子扩散速率。此外，基于LiFePO正极和所制备的MOF组装了一个全电池。Zn-Ni-PTA在100次循环后表现出97.9 mA h g的可逆比容量，容量保持率为86.1%（0.5 C），证明了Zn-Ni-PTA负极作为实用锂离子电池的有前景候选材料具有优异的电化学性能。
