强化固相反应法制备超微LiNi_(0.5)Mn_(1.5)O_4粉末的工艺研究  

Study on Ultrafine-LiNi_(0.5)Mn_(1.5)O_4 Prepared by Enhanced Solid State Method

作　　者：贺茂[1,2] 陈吉华[1,2] 严红革[1,2] 徐枫[1,2] 阳轩野[1,2] 苏斌[1,2] 张正富[3] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082 [2]湖南省喷射沉积技术及应用重点实验室,长沙410082 [3]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《人工晶体学报》2016年第4期956-961,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(U1202272)

摘　　要：以NiO,MnO_2和Li_2CO_3粉末为前驱体,采用高能球磨法对其进行活化处理,继而对其进行两段煅烧处理,成功地合成出了具有尖晶石结构的LiNi_(0.5)Mn_(1.5)O_4超微粉末。采用X射线衍射和扫描电子显微镜对最终产物的物相组成和形貌特征进行了表征。结果表明:经过高能球磨活化处理10 h后的粉末前驱体在700℃煅烧5 h之后再在900℃保温1 h的产物为结晶性能好的尖晶石型LiNi_(0.5)Mn_(1.5)O_4,粉末粒径大约为600 nm,粒径分布均匀,以0.1 C的倍率充放电,最高放电比容量达到127.8 m Ah/g,在0.5 C倍率下循环50次的容量保持率为98.8%。The ultrafine-LiNi0.5Mn1.5O4 with cubic spinel structure was successfully synthesized using Li2CO3,MnO2 and NiO as starting materials by mechanical activated followed by double calcining. The LiNi0.5Mn1.5O4 powders were also characterized by X-ray diffraction（ XRD）, scanning electron microscopy（ SEM）. It is found that can be obtained by ball-mill for 10 h followed by sintering at 700 ℃ /5 h-900 ℃ /1 h. The well-ordered high crystalline LiNi0.5Mn1.5O4 powders with the mean size of the primary nanoparticles about 600 nm and a narrow size distribution,and the discharge capacity is 127. 8m Ah / g at C /10 rate. After 50 cycles it could retain 98. 8% of its initial discharge capacity at the rate of0. 5 C.

关 键 词：锂离子电池 机械力活化 固相合成法 LINI0.5MN1.5O4 正极材料 

分 类 号：TB34[一般工业技术—材料科学与工程]