LiOH-Li_2CO_3低共熔混合锂盐体系合成LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2  

Synthesis of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 Cathode Material by Eutectic Molten Salt LiOH-Li_2CO_3

作　　者：常照荣[1] 张心宽[2] 陈中军[1] 汤宏伟[1] 

机构地区：[1]河南师范大学,河南新乡453007 [2]新乡学院,河南新乡453003

出　　处：《稀有金属材料与工程》2009年第A01期29-32,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助(20671031);河南省科技厅重点攻关项目资助(082102270013)

摘　　要：利用低共熔组成的0.24LiCO3-0.76LiOH混合锂盐体系,与钴、镍、锰的球形氢氧化物按1.1:1混合,无需前期球磨,直接经二段控温程序制备出锂离子正极材料LiNi1/3Co1/3Mn1/3O2。X射线衍射分析表明合成的Li(Ni1/3Co1/3Mn1/3)O2结晶度高,具有规整的层状α-NaFeO2结构,扫描电镜显示产物颗粒均匀,振实密度高达2.89g·cm-3,显著高于用单一锂盐制备的同样产品(2.4g·cm-3)。充放电测试表明,材料具有良好的电性能,首次充放电容量为176和166mhA·g-1,循环50次后,材料的电性能没有明显的衰减。The powder of Li（Ni1/3Co1/3Mnl/3）O2 was prepared directly without artificial grinding by a eutectic molten-salt mixture（0.24LiCO3-0.76LiOH with a melting point of 423 ℃） method, where the ratio of Li/（Ni＋Co＋Mn） in the raw materials of Ni1/3Co1/3Mn1/3（OH）2 and eutectic molten salt was controlled at 1：1. According to this method, the eutectic molten-salt mixture was self-mixed with precursor, and then sintered at a certain temperature. The tap-density of the powder obtained was 2.89 g.cm3. The well-layered a-NaFeO2structure and regular morphology were confirmed by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. Cathodic behaviour was examined by charge-discharge cycling, The synthesized powder showed initial charge-discharge capacity of 176 mAh·g^-1 and 166 mAh·g^-1 up to 50 cycles with no noticeable capacity-fading.

关 键 词：低共熔盐 锂离子电池 正极材料 LINI1/3CO1/3MN1/3O2 

分 类 号：TM912.9[电气工程—电力电子与电力传动]