柠檬酸对液相燃烧合成尖晶石型LiMn_2O_4的影响  

Effect of Citric Acid on Spinel LiMn_2O_4 Prepared by Solution Combustion Synthesis

作　　者：刘贵阳[1] 郭俊明[1] 戴志福[1] 张黎黎[1] 陈克新[2] 周和平[2] 

机构地区：[1]红河学院理学院,云南蒙自661100 [2]清华大学材料系,北京100084

出　　处：《稀有金属材料与工程》2007年第A01期115-117,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50542005;90610011);云南省自然科学基金(2005C0078M;2006E0091M)

摘　　要：以醋酸锰和醋酸锂为原料,柠檬酸为燃料,研究了不同柠檬酸用量及不同硝酸浓度改性对液态燃烧合成法制备尖晶石型LiMn2O4的影响。结果表明,柠檬酸与锰离子的摩尔比≤0.5时,所得产物的主晶相为LiMn2O4,含有极少Mn2O3等杂质;>0.5时,所得产物主要为Mn2O3,LiMn2O4含量较少。燃烧反应产物中LiMn2O4相对含量随硝酸浓度的升高而增加,当柠檬酸与锰离子的摩尔比为0.1,硝酸浓度为2mol/L时,所得尖晶石型LiMn2O4较纯净且结晶性较好,但晶体粒子尺寸分布不均。The effects of amounts of citric acid and concentrations of nitric acid on spinel LiMn2O4 prepared by liquid combustion synthesis using manganese acetate, lithium acetate as raw materials and citric acid as fuel were studied. The results indicated that there are main phase of LiMn2O4 and a little Mn2O3 when mole ratio of citric acid/Mn^2＋≤0.5, and main phase of Mn2O3 and a little LiMn2O4 when mole ratio of citric acid/Mn^2＋〉0.5. The content of LiMn2O4 increased with the increasing of HON3 concentration. Pure LiMn2O4 with good crystallinity but non-uniform crystal size distribution was obtained when the mole ratio of citric acid/Mn^2＋=0.1 and HNO3 concentration of 2 mol/L.

关 键 词：液相燃烧合成 尖晶石型LIMN2O4 柠檬酸 显微结构 

分 类 号：TB302[一般工业技术—材料科学与工程]