%0 Journal Article
%T K/Co共掺杂的钠离子电池正极材料Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>的制备和电化学性能研究<br>Preparation and Electrochemical Properties of K/Co Doping Sodium Ion Battery Cathode Material Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>
%A 曹希
%A 翟建广
%A 李文尧
%A 王睿君
%J Advances in Analytical Chemistry
%P 70-76
%@ 2163-1565
%D 2024
%I Hans Publishing
%R 10.12677/aac.2024.142009
%X Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> (NVP)材料是一种聚阴离子型磷酸盐类材料，它结构稳定、安全性高、工作电压高并且具有优异的结构。这些优点与其他电极材料相比，更有助于钠离子的快速迁移，这使得它成为一种非常具有发展潜力的钠离子电池正极材料。但由于NVP材料导电性有一定的缺陷，导致它的倍率性能和循环寿命不够优秀。我们对NVP材料采用离子掺杂的改性方法增强其电化学性能。本研究使用K和Co元素共同掺杂的改性思路，使用溶胶凝胶法成功制备出了K<sub>0.1</sub>Na<sub>2.95</sub>V<sub>1.95</sub>Co<sub>0.05</sub>(PO<sub>4</sub>)<sub>3</sub>材料作为钠离子电池正极材料。通过对该材料的表征分析和电化学分析，结果显示在1 C电流密度下，该材料具有107.5 mA·h/g的高比容量，高于NVP的比容量[1 C时99.2 mA·h/g]，并且在循环500圈后仍然保持了70.41%的容量。通过分别掺杂部分K<sup> </sup>和Co<sup>2 </sup>到Na1和V<sup>3 </sup>位点，使晶胞体积变大来加速Na<sup> </sup>的转移，用来改善材料的电化学性能。<br />
Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> (NVP) material is a polyanionic phosphate-like material that is structurally stable, safe, has a high operating voltage and has an excellent structure. These advantages contribute to the fast migration of sodium ions compared with other electrode materials, which makes it a very promising anode material for sodium-ion batteries. However, the conductivity of NVP material has some defects, which leads to its multiplicity performance and cycle life not being excellent enough. We used ion doping modification method for NVP material to enhance its electrochemical performance. In this study, using the modification idea of co-doping with K and Co elements, K<sub>0.1</sub>Na<sub>2.95</sub>V<sub>1.95</sub>Co<sub>0.05</sub>(PO<sub>4</sub>)<sub>3</sub> material was successfully prepared as the anode material for sodium-ion batteries using sol-gel method. Characterization and electrochemical analysis of the material showed that the material had a high specific capacity of 107.5 mA-h/g at 1 C current density, which was higher than that of NVP [99.2 mA-h/g at 1 C], and still maintained 70.41% capacity after 500 cycles. By doping some K<sup> </sup> and Co<sup>2 </sup> to Na1 and V<sup>3 </sup> sites, respectively, the cell volume was enlarged to accelerate Na<sup> </sup> transfer to improve the electrochemical performance of the material.
%K 磷酸矾钠，离子掺杂，正极材料，钠离子电池<br>Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>
%K Ionic Doping
%K Cathode Material
%K Sodium-Ion Batteries
%U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=86368