Constructing Schottky junction and multiheterostructure is considered a promising modification strategy to enhance reaction kinetics and prolong cycle life for alkali ion batteries, especially for potassium-ion batteries (KIBs) with sluggish kinetics and huge volume expansion. Herein, a well-designed multiheterostructure of SnS@C@MoS₂@NC micronflower is successfully synthesized, which consists of SnS, intermediate carbon, MoS₂ and N-doped carbon from interior to exterior. The Schottky junction with built-in electric-field induced by phase boundaries and the double carbon layers (intermediate carbon and N-doped carbon coating layer) significantly improve the electrons transfer rate, and simultaneously the multiheterostructure affords rapid K⁺ diffusion, strong K absorption and boosted electronic conductivity, resulting in superior charge transfer kinetics, which is explicitly unraveled by experimental results and first-principles calculations. Moreover, this multilayered structure with double carbon layers can effectively buffer the volumetric variation and maintain structural stability. Benefiting from these merits, the SnS@C@MoS₂@NC anode delivers remarkable reversible capacity (471 mAh g⁻¹ at 50 mA g⁻¹ after 100 cycles), outstanding rate performance (305 mAh g⁻¹ at 1000 mA g⁻¹) and ultralong lifespan (253 mAh g⁻¹ at 1000 mA g⁻¹ after 3000 cycles) for KIBs. This work sheds a light on fabricating advanced electrodes by utilizing the Schottky junction and multiheterostructure.

构建肖特基结和多异质结构被认为是一种很有前景的修饰策略，可以增强碱离子电池的反应动力学并延长循环寿命，特别是对于动力学缓慢和体积膨胀巨大的钾离子电池（KIB）。在此，成功合成了精心设计的多异质结构的 SnS@C@MoS ₂ @NC 微米花，从内部到外部由 SnS、中间碳、MoS ₂和 N 掺杂碳组成。由相边界和双碳层（中间碳和 N 掺杂的碳涂层）引起的内置电场的肖特基结显着提高了电子传输速率，同时多异质结构提供了快速的 K ⁺扩散、强 K 吸收和增强的电子电导率，导致优异的电荷转移动力学，实验结果和第一性原理计算明确揭示了这一点。此外，这种具有双碳层的多层结构可以有效缓冲体积变化并保持结构稳定性。受益于这些优点，SnS@C@MoS ₂ @NC 负极具有显着的可逆容量（100 次循环后50 mA g ^-1时为471 mAh g ^-1）、出色的倍率性能（1000 mA g ^{-1 时}为305 mAh g ^{-1 - 1} ) 和超长寿命（253 mAh g ^-1 at 1000 mA g ^-13000 次循环后）用于 KIB。这项工作揭示了利用肖特基结和多异质结构制造先进电极的方法。