以Mn3O4、Li2CO3和聚乙二醇为原料,利用高压喷雾干燥法制备LiMn2O4正极材料.采用X射线衍射仪(XRD)、扫描电镜(SEM)、电池充放电测试仪和原子发射光谱仪(ICP),对LiMn2O4正极材料的相组成特性、微观形貌、锂电性能和Mn的溶解量进行相关测试.结果表明:本方法制备的LiMn2O4正极材料具有良好的尖晶石结构,且300℃喷雾干燥后的颗粒形貌为规则球形;在55℃、0.2C充放电条件下,首次放电比容量达120.8 mAh/g,100次循环容量保持率为80.3％.此外,Mn的溶解量也优于烘箱干燥法制备.
A series of spinel LiMn2O4 cathode material were synthesized by the high pressure spray drying (HPSD) method using Mn3O4,Li2CO3,polyethylene glycol (PEG) as raw materials.The crystal structure and morphology of the materials were characterized by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM).The electrochemical performance and the Mn dissolution from the spinel samples were tested by galvanostatic charge-discharge system and inductive coupled plasma emission spectrometer (ICP).The results show that when the inlet temperature of HPSD is 300 ℃,the LiMn2O4 (P300-LMO) particles exhibit good spinel structure and regular spherical morphology.When galvanostatically charged and discharged at 0.2 C and 55 ℃,P300-LMO as cathode material exhibits initial discharge capacity of 120.92 mAh/g and capacity retention of 80.3％ after 100 cycles.The solubility of Mn in P300-LMO is lower than that of with oven-drying process (N90-LMO).
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%