Sodium–tin metal–organic framework anode material with advanced lithium storage properties for lithium-ion batteries
Sodium–tin metal–organic framework anode material with advanced lithium storage properties for lithium-ion batteries
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DOI：
10.1007/s10853-020-04436-6
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发表时间：
2020-02
影响因子：
4.5
通讯作者：
Na Wu;Yu-Jing Yang;Ting Jia;Taohai Li;Feng Li;Zhe Wang
中科院分区：
文献类型：
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作者：
Na Wu;Yu-Jing Yang;Ting Jia;Taohai Li;Feng Li;Zhe Wang
锡基材料作为锂离子电池负极材料具有很高的理论容量。然而，锂离子在插入和提取过程中的体积膨胀问题严重限制了其发展。本文采用简单回流法制备了钠锡金属有机骨架(Na-Sn-MOF)化合物。并研究了该化合物作为锂离子电池负极材料的反应机理。1，4-苯二甲酸配体和较大的Na+离子构成的特殊的稳定结构将有效地限制TiN在锂电离过程中的体积膨胀。因此，钠锡金属有机骨架负极材料表现出523mAhg−1的高锂容量，具有良好的循环稳定性和倍率能力。此外，当锂离子不断嵌入和释放时，锂离子电池负极材料的库仑效率接近100%。这项工作对于解决锡基材料的体积膨胀问题具有十分重要的意义。
Tin-based materials have a high theoretical capacity as a negative electrode material for lithium-ion batteries. However, the problem of volume expansion during lithium-ion insertion and extraction has severely limited its development. In this work, sodium–tin metal–organic framework (Na–Sn-MOF) compounds were successfully synthesized by simple reflux method. And we studied the reaction mechanism of the compound as anode materials for lithium-ion batteries. The special stable structure constructed by the 1,4-benzenedicarboxylic acid ligands and larger Na+ions will limit volume expansion of the tin effectively during the process of lithium–delithium. Therefore, the sodium–tin metal–organic framework anode material exhibits a high lithium storage capacity of 523 mAh g−1with good cycling stability and rate capability. In addition, the Coulombic efficiency of the anode material for lithium-ion batteries is closed to 100% when the lithium ions are constantly embedded and released. This work for solving the problem of volume expansion of tin-based materials is quiet meaningful.