首页|镍铁锰酸钠层状氧化物的制备及性能研究

镍铁锰酸钠层状氧化物的制备及性能研究

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O3型NaNi0.4Fe0.2Mn0.4O2正极材料具有比容量高、高低温性能优良等特性,是一种具有实际应用价值的钠离子正极材料.通过共沉淀法制备了一系列正极材料,重点研究了pH对材料特征和性能的影响.借助扫描电子显微镜(SEM)、X射线衍射仪(XRD)、恒电流间歇滴定技术(GITT)及其他电化学测试技术对NaNi0.4Fe0.2Mn0.4O2材料的形貌、晶格参数、循环性能、倍率性能、钠离子扩散系数及赝电容贡献率等进行分析,发现随着pH的增大,样品粒径呈减小趋势,且过高的pH会造成样品粒径锐减,最佳合成pH为11.最佳pH条件下NaNi0.4Fe0.2Mn0.4O2材料的电化学测试结果表明,在30℃下电流密度为0.2C时,其放电比容量为142.3 mA·h/g,展现出优异的电化学性能.
Study on preparation of nickel-iron-manganate sodium layered oxides and their properties
The O3-type NaNi0.4Fe0.2Mn0.4O2 cathode material has the characteristics of high specific capacity and excellent high/low-temperature performance,which is a kind of sodium-ion cathode material with practical application value.A series of cathode materials were prepared by co-precipitation method,and the effects of pH on the characteristics and performance of the materials were investigated.With the help of scanning electron microscope(SEM),X-ray diffractometer(XRD),con-stant current intermittent titration technique(GITT)and other electrochemical testing techniques,the morphology,lattice parameter,cycling performance,multiplicity performance,sodium-ion diffusion coefficient,and pseudocapacitance contri-bution of the NaNi0.4Fe0.2Mn0.4O2 materials were analyzed,and the samples were found to have a decreasing particle size with the increase of pH.It was found that the particle size of the samples decreased with the increase of pH,and excessive high pH would cause a sharp decrease in the particle size of the samples,and the optimal synthesis pH was 11.The electrochemi-cal test results of the NaNi0.4Fe0.2Mn0.4O2 material at the optimized pH showed that the discharge specific capacity of NaNi0.4Fe0.2Mn0.4O2 material at 30℃with a current density of 0.2C was 142.3 mA·h/g,which exhibited excellent electro-chemical performance.

sodium-ion batterycoprecipitationsodium-ion diffusion coefficientpseudocapacitance

王亿周、胡晓梅、王永详、张维民

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山东理工大学化学化工学院,山东淄博 255000

钠离子电池 共沉淀法 钠离子扩散系数 赝电容

国家自然科学基金项目

21776175

2024

无机盐工业
中海油天津化工研究设计院 中国化工学会无机酸碱盐专业委员会

无机盐工业

CSTPCD北大核心
影响因子:0.489
ISSN:1006-4990
年,卷(期):2024.56(2)
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