高压喷雾干燥法制备锂离子电池正极材料LiMn_2O_4及其电化学性能  

Synthesis and electrochemical performance of LiMn_2O_4 cathode material for Lithium ion battery by high pressure spray drying

作　　者：张雁南[1,2] 张英杰[1,2] 于晓华[2,3] 金丽颖[4] 李雪[2,5] 梁慧新[2,5] 董鹏[2,5] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]锂离子电池及材料制备技术国家地方联合工程实验室,云南昆明650093 [3]昆明理工大学固体废弃物资源化国家工程研究中心,云南昆明650031 [4]山东体育学院,山东济南250102 [5]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《材料热处理学报》2017年第5期1-5,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51604132;51601081)

摘　　要：以Mn_3O_4、Li_2CO_3和聚乙二醇为原料,利用高压喷雾干燥法制备LiMn_2O_4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LiMn_2O_4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LiMn_2O_4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℃、0.2 C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 LiMn2 O4 cathode material were synthesized by the high pressure spray drying （HPSD） method using Mn3 O4 , 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）.

关 键 词：锂离子电池 尖晶石锰酸锂 高压喷雾干燥法 容量保持率 

分 类 号：TG146.2[一般工业技术—材料科学与工程]