高载量磷掺杂MoS₂的制备及储锌性能的研究

Preparation of High-Mass Phosphorus-Doped MoS₂ and Study of Zinc Storage Properties

摘要: 使用简单的水热法制备了高载量(约为10 mg∙cm⁻²)的磷掺杂MoS₂，通过形貌表征、电化学测试等方法证明了磷的掺杂可以扩大MoS₂的层间距，提高导电性以及比容量。同时，开发了准固态电解质(PVA/ZnCl₂)来代替含水电解质(Zn(CF₃SO₃)₂)，有效地解决了MoS₂在水性电解质中容易溶解和结构坍塌等问题。所制备的Zn//MoS₂-P电池的循环寿命也有显著提高，比容量也有了明显提升，从131 mAh∙g⁻¹ (在含水电解质中)提高到了184 mAh∙g⁻¹ (在准固态电解质中)以及优异的倍率性能(在1 A∙g⁻¹下容量为65 mAh∙g⁻¹)。

Abstract: Phosphorus-doped MoS₂ with high load capacity (about 10 mg∙cm⁻²) was prepared by a simple hydrothermal method. By means of morphology structure and electrochemical properties, the doping of phosphorus can expand the layer spacing of MoS₂, improve the conductivity and specific capacity. At the same time, the quasi-solid gel electrolyte (PVA/ZnCl₂) was developed to replace the aqueous electrolyte (Zn(CF₃SO₃)₂), which effectively solved the problems of the dissolution and structure collapse of MoS₂ in the aqueous electrolyte. The cycle life of the Zn//MoS₂-P cells was also significantly improved, increasing the specific capacity from 131 mAh∙g⁻¹ (in aqueous electrolyte) to 184 mAh∙g⁻¹ (in gel electrolyte) and excellent multiplier performance (65 mAh∙g⁻¹ at 1 A∙g⁻¹).