采用固相配位法制备超细LiMn₂O₄正极材料

来源期刊：中南大学学报(自然科学版)2005年第3期

论文作者：陈立宝 贺跃辉 汤义武

文章页码：390 - 395

关键词：固相配位化学;尖晶石LiMn₂O₄;超细粉末;电极材料

Key words：solid state coordination method; spinel LiMn₂O₄; ultrafine powder; cathode material

摘    要：采用固相配位反应法制备锂离子电池正极材料LiMn₂O₄,并对配位络合剂用量和反应温度对最终产物的物相、比表面积、粒径和电性能的影响进行研究。研究结果表明:采用固相配位法可制备超细LiMn₂O₄粉末,配位化合物前驱体在550℃时焙烧12 h,粉末的粒度细小,粒径在0.06~0.50μm的粉末占82.10%;粉末的平均粒径为138.12 nm,比表面积为10.15 m²/g,颗粒形貌规则,内部有很多微孔;材料的首次充、放电比容量分别为126.0 mA·h/g和124.2 mA·h/g,首次充放电效率为98.6%,经15次循环后,材料的容量保持率为91%。

Abstract: The solid state coordination method was used to synthesize ultrafine LiMn₂O₄powder. The influences of the volume fraction of citric acid and the calcining temperature on the purity, specific surface area, particle size and electrochemical properties of LiMn₂O₄ powders were investigated. The ultrafine LiMn₂O₄ powder with an average particle size of 138.12 nm and a specific surface area of 10.15 m²/g is obtained when the initial materials is calcined at 550℃for 12 h. The powders with the particle size in range of 0.06-0.5μm account for 82.10%, and the powder show regular morphology and porous internal structure. The first charge and discharge specific capacity of the powders is 126.0 mA·h/g and 124.2 mA·h/g, respectively, the Coulomb efficiency is 98.6%, and the capacity remains 91% after 15 cycles.