摘要
分别以电解二氧化锰和四氧化三锰为原料,采用固相法制备了2种锂离子电池正极材料———尖晶石型锰酸锂。结合X射线衍射(XRD)、扫描电镜(SEM)及电性能测试,对两种产物的物化性能以及电性能进行了检测分析,结果表明:以电解二氧化锰(EMD)和Mn3O4为原料,在合适的条件下都能制备出性能较好的锰酸锂正极材料;由Mn3O4制备的锰酸锂呈晶粒大小较为均匀的单晶八面体形貌;由电解二氧化锰制备的锰酸锂呈晶粒大小不均匀的二次颗粒形貌;用Mn3O4制备的锰酸锂1C下循环700次,其容量保持率为105.3%;而以电解二氧化锰制备的锰酸锂1C下循环700次,其容量保持率为79.0%。
Two kinds of lithium-ion battery cathode materials,spinel LiMn2O4,were synthesized by solid-phase method with Mn3O4 and electrolytic manganese dioxide as raw materials.The physicochemical and electrical properties of the materials were characterized by XRD,SEM and electric performance tests.The results showed that the cathode material spinel LiMn2O4 with good performance could be synthesized under suitable conditions with EMD and Mn3O4 as raw materials.The crystal grains of the spinel LiMn2O4 synthesized with Mn3O4 has more uniform size and octahedral morphology while that made from EMD displays nonuniform crystal size and secondary particle morphology.The capacity retention of the former is 105.3% after 700 cycles at 1C rate while that of the later is 79.0%.
出处
《矿冶工程》
CAS
CSCD
北大核心
2012年第6期113-115,共3页
Mining and Metallurgical Engineering
关键词
锂离子电池
正极材料
锰酸锂
四氧化三锰
二氧化锰
lithium-ion battery
cathode material
lithium manganate
Mn3O4
manganese dioxide
