摘要
采用"熔融浸渍法"合成了Mg和F共掺杂的不同温度下的锂离子电池正极材料LiMn1.9Mg0.1O4-yFy(y=0.03、0.05、0.1);煅烧温度为700、750和800℃。通过XRD对样品进行测试,样品为单一尖晶石结构的物相;并用SEM对样品进行了形貌研究。当y=0.05时样品表面光滑,粒度分布范围小。用所制备的材料作为正极材料组装了模拟锂离子电池;在室温下进行恒电流充-放电性能测试,随着材料制备温度的升高,电池的初始放电容量逐渐增加,但充放电循环的容量损失也逐渐增加;而在800下℃,y=0.05时,其初始放电容量高达117 mAh/g;60次充-放电循环后,容量保持其初始容量的83%,该材料具有高的放电容量和优良的循环性能。
F-Mg co-doped spinel LiMn1.9Mg0.1O4-yFy（y=0. 03,0. 05,0.1）as cathode materials for lithium-ion batteries were synthesized by a ＂melting-impregnation＂ method. The calcinating temperatures were 700, 750,and 800℃, respectively. Their morphologies and microstructure were examined by powder XRD analysis and SEM. The XRD spectra showed that the samples had pure spinel structure phase. The sample with y=0.05 had a smoother surface and a narrow particle size distribution. Their electrochemical properties were studied by constant current charge-discharge testing. The initial discharge capacity of LiMn1. 9 Mg0.1O3.97 F0. 03 increased with rising calcinating temperatures. Their capacity loss also increased gradually. Results indicated that ： LiMn1.9 Mg0.1O3.95 F0.05 being synthesized at 800 ℃ delivers an discharge capacity of 117 mAh/g for the first cycle and still retained 83% of the initial capacity after 60 cycles at room temperature. It exhibited an excellent cycling stability and a high capacity.
出处
《化工新型材料》
CAS
CSCD
北大核心
2008年第3期65-67,共3页
New Chemical Materials
关键词
锂锰尖晶石
正极材料
锂离子电池
熔融浸渍法
共掺杂
Li-Mn spinel, cathode material, Li-ion battery,melting-impregnation method, co-doping
作者简介
周华（1980-）男，硕士研究生，师从张海朗教授。主要研究方向为锂离子电池正极材料。
联系人：张海朗（1964-）男，出站博士后，教授，主要从事化学电源及材料、离子液体的研究。
