Tin-based metal materials are promising anode candidates for lithium-ion batteries due to their high theoretical capacity. However, their practical application is constrained by significant volume expansion, structural degradation, and slow electron transfer kinetics. In this study, a lyotropic Sn-MOF was synthesized using tin sulfate and terephthalic acid as the tin source and organic ligand. The lychee-like Sn-MOF was then utilized as a precursor to prepare a hollow porous SnS₂@SC composite containing S-doped carbon through a hydrothermal method. The SnS₂@SC composite features nanoflower-like SnS₂ embedded in a carbon skeleton, which increases the specific surface area, while the hollow structure derived from the Sn-MOF provides an efficient conductive network and buffer space to enhance electrochemical performance. As a result, the SnS₂@SC electrode exhibits an impressive initial discharge capacity of 1062.9 mAh g⁻¹ at 0.1 A g^-1 and excellent long-term cycling stability, retaining 689.5 mAh g⁻¹ at 2.0 A g^-1 after prolonged cycling. This study offers a viable strategy for the rational design of bimetallic sulfide heterostructures and provides insights into the development of advanced electrochemical applications.

中文翻译：

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类荔枝 Sn-MOF 衍生SnS2@SC复合材料作为锂离子电池的高级负极材料


锡基金属材料由于其高理论容量，是有前途的锂离子电池负极候选材料。然而，它们的实际应用受到显着体积膨胀、结构降解和缓慢电子转移动力学的限制。本研究以硫酸锡和对苯二甲酸为锡源和有机配体，合成了溶致性 Sn-MOF。然后，以荔枝状 Sn-MOF 为前驱体，通过水热法制备了含有 S 掺杂碳的空心多孔 SnS₂@SC 复合材料。SnS₂@SC 复合材料的特点是将纳米花状 SnS₂ 嵌入碳骨架中，这增加了比表面积，而源自 Sn-MOF 的中空结构提供了高效的导电网络和缓冲空间，以增强电化学性能。因此，SnS₂@SC 电极在 0.1 A ^g-1 时表现出令人印象深刻的 1062.9 mAh ^g-1 初始放电容量和出色的长期循环稳定性，在长时间循环后在 2.0 A g-1 下保持 689.5 mAh ^g-1。本研究为双金属硫化物异质结构的合理设计提供了一种可行的策略，并为高级电化学应用的发展提供了见解。