共沉淀法合成LiNi_(0.5)Mn_(1.5)O_4的工艺及其形貌控制研究  

Study on process and morphology control of LiNi_(0.5)Mn_(1.5)O_4 material synthesized with coprecipitation

作　　者：陈占军[1] 田修营[1] 钟洪彬[1] 彭红霞[1] 邓联平 胡传跃[1] 文瑾[1] 彭秧锡[1] 

机构地区：[1]湖南人文科技学院精细陶瓷与粉体材料湖南省重点实验室材料与环境工程学院,娄底417000

出　　处：《化工新型材料》2018年第2期147-150,共4页New Chemical Materials

基　　金：国家自然科学基金(51602101);湖南省自然科学基金(2016JJ4044);湖南省科技计划项目(2016TP1028)

摘　　要：对共沉淀法合成(Ni_(0.5)Mn_(1.5))(OH)_4前驱体的主要工艺参数展开了详细讨论,结果表明:当pH=10和螯合剂浓度为1mol/L时,其前驱体颗粒表现为球形且具有最高的密度;对终产物LiNi_(0.5)Mn_(1.5)O_4材料的物化性能和电化学性能进行了测试分析,扫描电镜和X射线衍射表征结果表明:其由直径为2~3μm、不规则形状的一次颗粒堆积成二次颗粒,产物不含有Li_(1-x)Ni_xO或NiO_x等不纯物;该样品具有较好的倍率和优秀的循环性能,可能归结于终产物具有较高的纯度,不含有杂相。LiNi_（0.5 ）Mn_（1.5 ）O_（4 ） material was synthesized with coprecipitation method.Single-factor experiment method,in conjunction with SEM and Tap density test were utilized to study the influence of various factors,including pH and the concentration of chelating agent on the morphology of precursor（Ni_（0.5）Mn_（1.5））（OH）_4.The results showed that the optimized condition for（Ni_（0.5）Mn_（1.5））（OH）_4 precursor may be summarized as：pH=10and the concentration of NH_3·H_2O was equal to 1mol/L.Additionally,the physic-chemistry properties and electrochemical performances of LiNi_（0.5）Mn_（1.5 ）O_（4 ）obtained from the precursor with the highest density were also measured by SEM,XRD and electrochemical test.The result showed that：（1）LiNi_（0.5）Mn_（1.5）O_（4 ）was maintained the morphology in its precursor and composed of primary particle with the diameter of 2~3μm;（2）the final product had a pure phase without any impurities such as Li_（1-x）Ni_xO or NiO_x;（3）LiNi_（0.5）Mn_（1.5）O_4displayed excellent rate and cycling performance,which can be attributed to its high purity.

关 键 词：尖晶石 LINI0.5MN1.5O4 共沉淀法 正极材料 

分 类 号：TM912[电气工程—电力电子与电力传动]