Sn-based compounds are emerging as a promising category of alkali metal ion storage materials due to their relatively high theoretical specific capacity and natural abundance. However, inadequate ion diffusion, poor electron transfer, and significant volume fluctuations during prolonged charge and discharge cycles lead to severe structural deterioration and capacity loss, hindering their further practical application. Heterostructure engineering can not only alleviate the internal stresses and dramatic volume alterations induced by ion deintercalation, but also enhance the dynamics of ion transport. Adopting a dual-optimization strategy that incorporates heterogeneous structure construction and doping, we successfully synthesized ultra-thin Co doped SnS₂/SnO₂ heterostructure nanosheets on carbon cloth substrates via a co-nucleation growth process. After rigorous investigation into its lithium-ion storage performance and mechanisms, it exhibited excellent lithium storage capabilities (1518 mA h g⁻¹ at 330 mA g⁻¹, with 81% of the initial capacity retained after 100 cycles). Pleasingly, when incorporated into next-generation sodium-ion batteries, Co-doped SnS₂/SnO₂ anodes exhibit highly competitive sodium storage capabilities (1250 mA h g⁻¹ at 220 mA g⁻¹, with 97.8% of the initial capacity retained after 200 cycles). The incorporation of Co ions and the formation of heterostructures have been confirmed to enhance ion diffusion and reaction kinetics. This study presents a novel approach for the facile preparation of multifunctional Li and Na ion storage materials featuring element-doped heterogeneous compositions.

中文翻译：

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共成核 Co 掺杂 SnO2/SnS2 异质结构，促进扩散到高性能 Li 和 Na 离子存储


Sn 基化合物由于其相对较高的理论比容量和自然丰度而成为一类很有前途的碱金属离子存储材料。然而，离子扩散不足、电子传递不良以及长时间充放电循环期间的显着体积波动会导致严重的结构恶化和容量损失，阻碍其进一步的实际应用。异质结构工程不仅可以减轻离子脱嵌引起的内部应力和巨大的体积变化，还可以增强离子传输的动力学。采用结合异质结构构建和掺杂的双重优化策略，我们通过共成核生长工艺在碳布衬底上成功合成了超薄 Co 掺杂 SnS₂/SnO₂ 异质结构纳米片。在对其锂离子存储性能和机理进行严格研究后，它表现出优异的锂存储能力（在 330 mA ^g-1 时为 1518 mA h ^g-1，在 100 次循环后保留了 81% 的初始容量）。令人高兴的是，当集成到下一代钠离子电池中时，共掺杂 SnS₂/SnO₂ 负极表现出极具竞争力的钠存储能力（在 220 mA ^g-1 时为 1250 mA h ^g-1，在 200 次循环后仍保留 97.8% 的初始容量）。Co 离子的掺入和异质结构的形成已被证实可以增强离子扩散和反应动力学。 本研究提出了一种简便制备具有元素掺杂异质成分的多功能 Li 和 Na 离子存储材料的新方法。