摘要
该文设计了基于溶液燃烧法制备具有快速储锂性能的五氧化二铌(Nb_(2)O_(5))电极的综合实验。使用XRD和SEM分析样品物相和形貌,采用恒流充放电测试研究不同晶相Nb2O5的电化学性质,并使用恒电流间歇滴定技术研究Li+扩散动力学,同时以循环伏安(cyclic voltammetry,CV)测试考察赝电容行为。结果表明:经950℃煅烧得到的H-Nb_(2)O_(5)具有最优储锂性能,在100 C的超大电流密度下可逆比容量达104 mAh/g。该综合实验设计简单,涵盖了材料的合成、结构表征和电化学测试等知识点,便于学生理解材料结构与性能的关系,同时能够提升学生的科研创新意识和综合实践能力。
A comprehensive and scientific research experiment based on the solution combustion method is designed to prepare niobium pentoxide(Nb_(2)O_(5))for high-rate lithium storage.The phase and morphology of the samples are analyzed by X-ray diffraction and scanning electron microscopy.The electrochemical performance of the Nb_(2)O_(5) anode is investigated by galvanostatic charge-discharge measurements,and the pseudo capacitance behavior is explored by cyclic voltammetry(CV)technique.The results indicate that H-Nb2O5 obtained at 950℃exhibits optimal lithium storage performance,demonstrating a reversible specific capacity of 104 mAh/g at an ultra-high current density of 100 C.This comprehensive experiment design is simple and covers the knowledge points of synthesis,characterization,and electrochemical performance,which is convenient for students to understand the relationship between the structure and performance of the materials.Furthermore,it also boosts their awareness of scientific research innovation and comprehensive practical skills.
作者
程秋实
陈嘉宇
陈学敏
李发堂
CHENG Qiushi;CHEN Jiayu;CHEN Xuemin;LI Fatang(Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface,College of Science,Hebei University of Science and Technology,Shijiazhuang 050018,China)
出处
《实验技术与管理》
CAS
北大核心
2023年第12期24-29,共6页
Experimental Technology and Management
基金
国家自然科学基金青年科学基金项目(51802075)
河北省自然科学基金青年科学基金项目(B2018208093)
河北省高等学校青年拔尖人才项目(BJ2019002)
河北省自然科学基金创新群体项目(B2021208005)。
