Transition metal dichalcogenides (TMDs) are regarded as the most potential candidates of anode materials for sodium-ion batteries (SIBs) owing to their high theoretical capacity, while the sluggish kinetics and huge volume variation that are accompanied by sodium-ion insertion/extraction cause inferior electrochemical performance. Herein, a P-doping-induced polymorph transformation strategy is proposed to modulate the electronic structure of CoSe₂ anode toward fast sodium storage. Density functional theory (DFT) calculations verify the unique effect of doping-induced polymorph engineering on modulating the electronic structure of CoSe₂. Therefore, due to the optimal electronic structure, improved ionic diffusion kinetics, and numerous exposure of reactive sites from hierarchical arrays, the P-CoSe₂/NC anode exhibits impressive rate capability (459 mA h g⁻¹ at 2 A g⁻¹) when used as an anode for SIBs. Our doping-induced polymorph engineering may be applicable to other advanced electrodes toward energy storage applications.

过渡金属二硫化碳（TMDs）由于其高理论容量而被认为是钠离子电池（SIBs）负极材料的最有可能的候选物，而动力学缓慢和巨大的体积变化伴随着钠离子的插入/引出原因电化学性能差。在本文中，提出了一种P掺杂诱导的多晶型物转变策略，以调节CoSe ₂阳极的电子结构，使其快速地储存钠。密度泛函理论（DFT）计算证明了掺杂诱导的多晶型工程对调制CoSe ₂电子结构的独特作用。因此，由于最佳的电子结构，提高了离子的扩散动力学，和从分层阵列的反应位点的众多曝光时，P-COSE ₂ / NC阳极表现出惊人的速度能力（459毫安ħ克^-1以2A克^-1）时用作SIB的阳极。我们的掺杂诱导多晶型工程可能适用于其他先进的电极，用于能量存储应用。