Abstract Nanometerization of tin-based materials is beneficial to alleviate the volume effect, and thus improving the cycle stability of tin-based materials. Meanwhile, the smaller size can enhance the reversibility of the conversion reaction, which is crucial for increasing the capacity of tin-based materials. Therefore, reducing the size of tin-based materials may bring the advantages of cycle stability and specific capacity. In this work, we tried to disperse tin ions with organic skeleton to maximize the dispersion of active materials. Tin-based anode material based on polyethyleneimine‑sodium xanthogenate is synthesized by in-situ method at room temperature, and the thiocarboxyl group of polyethyleneimine‑sodium xanthogenate greatly increases the dispersion of metal ions. Carbon nanotubes (CNTs) are further introduced to improve the conductibility of tin-based materials owing to the existence of non-conductive organic groups. The anode material exhibits a long cycle life which delivers a specific capacity of 560 mAh g−1 after 1000 cycles. By analyzing the differential charge capacity (dQ/dV) curves, we find that the conversion reaction of tin-based materials is highly reversible.

中文翻译：

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具有良好转化反应可逆性的锂离子电池锡基负极材料

摘要 锡基材料的纳米化有利于减轻体积效应，从而提高锡基材料的循环稳定性。同时，较小的尺寸可以增强转化反应的可逆性，这对于提高锡基材料的容量至关重要。因此，减小锡基材料的尺寸可能带来循环稳定性和比容量的优势。在这项工作中，我们尝试分散具有有机骨架的锡离子，以最大限度地分散活性材料。采用室温原位法合成聚乙烯亚胺-黄原酸钠基锡基负极材料，聚乙烯亚胺-黄原酸钠的硫代羧基大大增加了金属离子的分散性。由于非导电有机基团的存在，进一步引入碳纳米管 (CNT) 以提高锡基材料的导电性。负极材料具有较长的循环寿命，在 1000 次循环后可提供 560 mAh g-1 的比容量。通过分析微分电荷容量（dQ/dV）曲线，我们发现锡基材料的转化反应是高度可逆的。