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mofs衍生金属氧化物的制备及其在锂离子电池中的储能特性研究
首发时间：2024-02-28
摘要：锡基材料具有其低电位和高理论比容量特点，显示出作为锂储存材料的巨大潜力。但锡基材料在锂离子脱嵌过程中会出现巨大的体积膨胀导致材料结构被破坏，电池性能下降。为克服这一问题，本文提出了制备一种球形sn-mof并对其在不同温度下进行烧结。利用mofs结构使锡或锡氧化物均匀分布于有机配体衍生的多孔碳骨架中，这种结构可以有效环节锡或锡氧化物的体积膨胀问题，多孔结构也有利于提高锂离子的扩散速率。对sn-mof衍生物在不同温度下的形貌及电化学性能进行探究，结果表明当烧结温度在500℃下时材料可以保持原有结构，在500ma/g的电流密度下循环200圈仍有599.5mah/g的比容量，表现出优异的电化学性能。
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preparation of mofs-derived metal oxides and their energy storage properties in lithium-ion batteries
abstract：tin-based materials show great potential as lithium storage materials due to their low potential and high theoretical specific capacity characteristics. however, sn-based materials suffer from huge volume expansion during lithium ion de-embedding leading to disruption of the material structure and degradation of the battery performance. to overcome this problem, this paper presents the preparation of a spherical sn-mof and its sintering at different temperatures. the structure of mofs is utilized to uniformly distribute tin or tin oxides in the porous carbon skeleton derived from organic ligands, which can effectively link the volume expansion problem of tin or tin oxides, and the porous structure is also conducive to improving the diffusion rate of lithium ions. the morphology and electrochemical properties of the sn-mof derivatives were investigated at different temperatures, and the results show that the materials can maintain the original structure when the sintering temperature is at 500℃, and the specific capacity of 599.5mah/g can still be achieved by cycling for 200 cycles at a current density of 500ma/g, which shows excellent electrochemical properties.
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mofs衍生金属氧化物的制备及其在锂离子电池中的储能特性研究
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