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文章编号: 1672-6987(2026)01-0051-10 DOI: 10.16351/j.1672-6987.2026.01.008
李波, 朱开兴*(青岛科技大学 机电工程学院, 山东 青岛 266061)
摘要: 碳包覆是改善氟磷酸钒钠(Na3V2(PO4)2F3,NVPF)电化学性能的有效方法,但高温碳化过程不仅使NVPF微粒团聚长大,而且会使其因为氟的损失形成杂相。在制备过程中引入介孔碳(MC),采用一步水热合成法,制备具有核壳结构的纳米复合材料NVPF@MC。与采用高温处理得到的NVPF@C相比,本方法显著减少了NVPF的团聚,亦没有形成杂相。所获得的NVPF@MC表现出高的可逆放电比容量(1 C时初始放电比容量为118.3 mAh · g-1)、优异的循环稳定性(在1 C和5 C下进行500和2 000次循环后容量保持率分别为86.6%和75.2%)和良好的Na+扩散能力(离子扩散系数为6.4×10-11 cm2 · s-1)。
关键词: 钠离子电池; 氟磷酸钒钠; 介孔碳; 核壳结构
中图分类号: TQ 207+.2 文献标志码: A
引用格式: 李波, 朱开兴. NVPF@MC核壳结构的制备及其作为钠离子正极材料的电化学性能[J]. 青岛科技大学学报(自然科学版), 2026, 47(1): 51-60.
LI Bo, ZHU Kaixing. Preparation of NVPF@MC core-shell structures and electrochemical performance study as a battery cathode material[J]. Journal of Qingdao University of Science and Technology(Natural Science Edition), 2026, 47(1): -.
Preparation of NVPF@MC Core-Shell Structures and Electrochemical Performance Study as a Battery Cathode Material
LI Bo, ZHU Kaixing(College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China)
Abstract: Carbon-coating is an effective method to improve the electrochemical properties of sodium vanadium fluorophosphate (Na3V2(PO4)2F3, NVPF), yet the high-temperature carbonization process not only causes NVPF particles to agglomerate and grow, but also forms impure phase due to the loss of fluorine. Herein, NVPF@MC nanocomposites with core-shell structure were prepared by adding mesoporous carbon (MC) in the preparation process via one-step hydrothermal synthesis method. Compared with NVPF@C obtained by high temperature treatment, this method significantly reduced the agglomeration of NVPF and no impure phase was introduced. The obtained NVPF@MC exhibited high reversible discharge specific capacity (initial discharge specific capacity of 118.3 mAh · g-1 at 1 C), excellent cycling stability (capacity retention of 86.6% and 75.2% after 500 and 2 000 cycles at 1 C and 5 C, respectively) and superior Na+ diffusion ability (ion diffusion coefficient of 6.4 × 10-11 cm2 · s-1).
Key words: sodium-ion battery; sodium vanadium fluorophosphate; mesoporous carbon; core-shell structure
收稿日期: 2025-01-30
基金项目: 国家自然科学基金项目(51972186);山东省科技厅项目(2024TSGC0210).
作者简介: 李波(1998—),男,硕士研究生. * 通信联系人.