熔融盐法合成高密度锂离子电池正极材料LiNi_(0.8)Co_(0.2-x)Al_xO_2  

Preparation of High-Density LiNi_(0.8)Co_(0.2-x)Al_xO_2 as Cathode Material for Lithium Ion Battery by Molten Salt Method

作　　者：汤宏伟[1] 赵付双[1] 常照荣[1,2] 

机构地区：[1]河南师范大学,河南新乡453007 [2]北京理工大学,北京100080

出　　处：《稀有金属材料与工程》2010年第2期333-337,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助(20671031)

摘　　要：利用低共熔组成的0.38LiOH-0.62LiNO3混合锂盐体系,与高密度前驱体Ni0.8Co0.2-xAlx(OH)2(0≤x≤0.15)在低温下自混合,无需前期研磨和后续洗涤,直接制备出高密度Co-Al共掺杂的锂离子电池正极材料LiNi0.8Co0.2-xAlxO2(0≤x≤0.15)。X射线衍射分析结果表明,合成的LiNi0.8Co0.2-xAlxO2具有规整的层状α-NaFeO2结构。扫描电镜显示产物颗粒均匀,LiNi0.8Co0.15Al0.05O2的振实密度达2.97g·cm-3。电性能测试表明,在0.2C放电倍率和3.0～4.3V的电压范围内,LiNi0.8Co0.15Al0.05O2首次放电比容量达167.5mAh·g-1,且具有良好的循环性能。Co-Al co-doped cathode material LiNi0.sCo0.2-xAlxO2 （0≤x≤0.15） was directly synthesized without artificial grinding and washing by a eutectic molten-salt mixture （0.38LiOH-0.62LiNO3） method. According to this method, the eutectic molten-salt mixture was self-mixed with high tap density precursor Ni0.5Co0.2-xAlx（OH）2 thoroughly at low temperature and then sintered at a certain temperature. The tap-density of LiNi0.5Co0.15Al0.05O2 obtained is 2.97 g.cm^-3. According to XRD and SEM, these LiNi0.5Co0.2.xAlxO2 materials have an order a-NaFeO2 layer structure and regular morphology. The charge-discharge tests show that the LiNi0.8Co0.15Al0.05O2 has an initial discharge capacity as high as 167.5 mAh.g^-1 and excellent capacity retention in the range from 3.0 V to 4.3 V at a specific current of 0.2 C

关 键 词：熔融盐法 高密度 LiNi0.8Co0.2-xAlxO2 Co—Al共掺杂 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学]