分子焊接技术提高V2C的锂离子存储性能
Improving the Lithium-Ion Storage Performance of V2C with Molecular Welding Technology
DOI: 10.12677/APP.2024.142005, PDF,   
作者: 付首超：哈尔滨师范大学物理与电子工程学院，黑龙江 哈尔滨
关键词: 锂离子存储；V2C；分子焊接；Lithium-Ion Storage； V2C； Molecular Welding
摘要: 在过渡金属碳氮化合物(MXene)家族中，碳化钒(V2C)具有较高的理论锂离子容量和较低的扩散势垒，具有作为锂离子电池负极的潜力。然而互相堆叠的V2C层间存在较强的范德华力作用，使得其表面活性位点并未得到充分暴露，进而降低其锂离子存储性能。本文首次将分子焊接技术应用于V2C材料，氨化后的V2C表面的氨基与1,3,5-苯三羧酸(BTC)分子上的羧基反应形成酰胺键(HN-C=O)，将BTC分子固定在V2C层间。BTC分子的引入扩大了V2C材料的层间距，提高了材料的离子可及性。复合形成的V2C/BTC电极在0.1 A•g−1的电流密度下展示了655.7 mAh•g−1的高比容量，在5 A•g−1的大电流密度下循环1000圈后仍可提供163.5 mAh•g−1的高比容量。以上的研究表明了V2C/BTC材料在锂离子存储领域中的潜力，同时对其他MXene在锂离子电池领域的应用提供了一定的指导。
Abstract: In the family of transition metal carbon-nitrogen compounds (MXene), vanadium carbide (V2C) has the potential to be used as a negative electrode in lithiumion batteries due to its high theoretical lithiumion capacity and low diffusion barrier. However, due to the strong van der Waals interaction between the stacked V2C layers, the surface active sites of the stacked V2C layers are not fully exposed, which reduces the lithium-ion storage performance. In this paper, molecular welding technology was first applied to V2C materials. The amino group on the surface of ammoniated V2C reacted with the carboxyl group on the 1,3,5-phenyltricarboxylic acid (BTC) molecule to form amide bond (HN-C=O), and the BTC molecule was fixed between the layers of V2C. The introduction of BTC molecules expands the layer spacing of the V2C material and improves the ion accessibility of the material. The composite-formed V2C/BTC electrode exhibited A high specific capacity of 655.7 mAh•g−1 at A current density of 0.1 A•g−1 and still provided a high specific capacity of 163.5 mAh•g−1 after 1000 cycles at a high current density of 5 A•g−1. The above studies demonstrate the potential of V2C/BTC materials in the field of lithiumion storage, while providing some guidance for other MXenes in the field of lithiumion batteries.
文章引用：付首超. 分子焊接技术提高V2C的锂离子存储性能[J]. 应用物理, 2024, 14(2): 31-37. https://doi.org/10.12677/APP.2024.142005

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