正交Li1-xMnO2(0≤x≤0.95)首次充电过程中物相及结构的演变

稀有金属材料与工程, 2011, 40(3): 424-428.

正交Li1-xMnO2(0≤x≤0.95)首次充电过程中物相及结构的演变

范广新 ^1, , 曾跃武 ^2, , 陈荣升 ^3, , 吕光烈 ^4,

1.河南理工大学,河南,焦作,454000;浙江大学,浙江,杭州,310028

2.浙江大学,浙江,杭州,310028

3.浙江大学,浙江,杭州,310028

4.浙江大学,浙江,杭州,310028

基金项目: 河南省教育厅自然科学研究项目(2009A430010) 河南理工大学博金(B648238)

关键词：正交LiMnO2 , 充电过程 , 相变 , 结构演变

Evolutions of Phase and Microstructure of Orthorhombic Li1-xMnO2(0≤x≤0.95)during the First Charge Process

用高精度非原位XRD结合Rietveld精修对正交Li1-xMnO2(简写为o-Li1-xMnO2,0≤x≤0.95)在首次充电(电化学脱锂)过程中物相及结构的演变进行了研究.结果表明,o-LiMnO2电极的电压升高速率与其结构的变化有关;随着电化学脱锂o-LiMnO2发生一系列相变.证实了文献的理论计算和由晶体学推测出的相变过程,即相变产物中先后出现岩盐型锰酸锂和类尖晶石型锰酸锂.相变结束后,产物中只有岩盐型和类尖晶石锰酸锂2种物相.随着充电的进行,都有Li+从岩盐型和类尖晶石锰酸锂晶格中脱出,二者晶胞参数逐渐变小,微结构也不断变化.

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材料期刊网

正交Li1-xMnO2(0≤x≤0.95)首次充电过程中物相及结构的演变

Evolutions of Phase and Microstructure of Orthorhombic Li1-xMnO2(0≤x≤0.95)during the First Charge Process

参考文献