摘要
设计了“常温预还原-热处理法制备钠离子电池正极材料磷酸钒钠”综合性研究实验,探究了原料种类和热处理温度对Na_(3)V_(2)(PO_(4))_(3)/C的物相、晶体结构、晶粒尺寸、微观形貌及电化学性能的影响。研究表明,NH_(4)VO_(3)中的V^(5+)更易被草酸常温还原,机械活化后所得前驱体为无定形结构,由该前驱体热处理制备的Na_(3)V_(2)(PO_(4))_(3)/C结晶度更高,且电化学性能更优。通过优化合成温度,发现在700℃下合成的Na_(3)V_(2)(PO_(4))_(3)/C具有最高的比容量、最优的倍率性能和最佳的循环性能。在实验中,学生通过材料制备、结构及形貌表征、电池制作与电化学性能分析等环节,能够达到强化理论知识、提高实验技能、激发创新性思维的目的。
A comprehensive research experiment of"preparation of sodium vanadium phosphate as cathode material for sodium ion battery by normal temperature pre-reduction-heat treatment method"was designed,and the effects of the raw material and heat treatment temperature on the phase,crystal structure,crystal size,micromorphology and electrochemical performance of Na_(3)V_(2)(PO_(4))_(3)/C were investigated.The results show that V^(5+) in NH_(4)VO_(3) is more easily reduced by oxalic acid at room temperature,and the precursor obtained after mechanical activation is amorphous.The material of Na_(3)V_(2)(PO_(4))_(3)/C prepared by heat treatment with the precursor has higher crystallinity and better electrochemical performance.By optimizing the synthesis temperature,it is found that Na_(3)V_(2)(PO_(4))_(3)/C synthesized at 700℃has the highest specific capacity,the best rate performance and the best cycle performance.In the experiment,students can strengthen theoretical knowledge,improve experimental skills and stimulate innovative thinking through the material preparation,structure and morphology characterization,battery production and electrochemical performance analysis.
作者
张晓萍
隋裕雷
伍凌
ZHANG Xiaoping;SUI Yulei;WU Ling(School of Iron and Steel,Soochow University,Suzhou 215021,China)
出处
《实验技术与管理》
CAS
北大核心
2023年第4期177-180,186,共5页
Experimental Technology and Management
基金
国家自然科学基金项目(51974190,51574170)
苏州大学教学改革项目“教、学、竞、践”四位一体的材料类专业实践教学模式改革与探索。
关键词
钠离子电池
正极材料
磷酸钒钠
综合实验
Na-ion batteries
cathode materials
Na_(3)V_(2)(PO_(4))_(3)
comprehensive experiment
