Heterostructures have great potential in developing high-rate sodium-ion batteries because of their boosted charge transfer capability. However, the rational design of heterostructures with ideal electrochemical performance under high current density is still a challenge. Herein, we successfully developed a facile approach to address the aforementioned problem by synthesizing vertically aligned MoS₂/CoS₂ heteronanosheets with high content 1T MoS₂ as the anode for sodium-ion batteries. The MoS₂/CoS₂ heterostructure exhibits superior rate performance (274 mAh g⁻¹ at 10 A g⁻¹), high discharge capacity (548 mAh g⁻¹ at 0.2 A g⁻¹), and excellent long-cycle stability (capacity retention of 90.6% after 150 cycles under 1 A g⁻¹). The improved rate performance could be attributed to novel design of heterostructures with accelerated charge transfer capability and enhanced electronic conductivity by 1T phase of MoS₂. Density functional theory (DFT) calculations further verify that abundant built-in electric fields are induced by the constructed MoS₂/CoS₂ heterostructure, which can greatly facilitate charge transport. This work presents a highly conductive and stable heterostructure with advanced sodium storage performance and beyond.

异质结构因其电荷转移能力增强而在开发高速率钠离子电池方面具有巨大潜力。然而，在高电流密度下合理设计具有理想电化学性能的异质结构仍然是一个挑战。在这里，我们成功地开发了一种简便的方法来解决上述问题，方法是合成垂直排列的，具有高含量1T MoS _2的MoS ₂ / CoS ₂异质片作为钠离子电池的阳极。所述MOS ₂ / COS ₂异质结构表现出优良的速率特性（274毫安克^-1 以10 A G ^-1），高的放电容量（毫安548克^-1 在0.2 A克^-1）和优异的长循环稳定性（在1 A g ^-1下150次循环后的容量保持率为90.6％）。速率性能的提高可归因于异质结构的新颖设计，该异质结构具有加速的电荷转移能力和MoS _2的1T相增强的电子电导率。密度泛函理论（DFT）的计算进一步验证了所构建的MoS ₂ / CoS ₂异质结构会感应出大量的内置电场，从而极大地促进了电荷的传输。这项工作提出了一种高导电性和稳定的异质结构，并具有先进的钠存储性能。