【作者】 郭俊明； 王宝森； 刘贵阳； 翟凤瑞； 刘杰； 何英；

【Author】 GUO Jun-ming WANG Bao-sen LIU Gui-yang ZHAI Feng-rui LIU Jie HE Ying (College of Science,Honghe University,Mengzi 661100,China)

【机构】 红河学院理学院化学系；

【摘要】 以硝酸锂和硝酸锰为原料,醋酸为燃料,研究了醋酸、焙烧温度和焙烧时间对溶液燃烧合成尖晶石型LiMn₂O₄粉体材料的影响。实验结果表明,当醋酸与原料中硝酸根的摩尔比≥7.4时,硝酸根中的N才能全部转化为N₂,而尿素很易将硝酸根中的N转化为N₂;在硝酸盐体系中加入醋酸为燃料有利于溶液燃烧合成尖晶石型LiMn₂O₄物质,但醋酸用量对合成LiMn₂O₄纯度及晶粒大小的影响不大;在550～800℃二次焙烧既可使产物的结晶性增加,也可使产物中Mn₂O₃相的相对含量减少,但不能消除Mn₂O₃相,焙烧温度最佳为600℃,焙烧温度800℃时样品会发生分解,在550℃焙烧样品最佳时间为12h左右。更多还原

【Abstract】 The effect of acetic acid,calcination temperature and time on solution synthesis of LiMn₂O₄ powder materials was investigated.Nitrate lithium,acetate manganese were used as raw materials,and acetic acid was used as fuel.The experimental results indicated that when acetic acid.nitrate radical≥7.4 （mole ratio）,all of the nitrate radicals could be converted into N₂.It is easy for urea to convert nitrate radicals into N₂.The use of acetic acid as fuel in nitrate system favors the formation of LiMn₂O₄.However,the purity and grain size of LiMn₂ O₄ changed little when using different content of acetic acid.Second-calcination could enhance the crystal- line of product at 550-800℃,and decrease the relative content of the impurity Mn₂O₃,but could not remove all of the Mn₂O₃.The optimal calcination temperature is 600℃,and the product would decompose at 800℃.The opti- mal calcination time at 550℃is 12h.更多还原