共沉淀法合成正极材料LiMnPO4/C

摘要

Carbon-coated lithium manganese phosphate (LiMnPO4/C) was synthesized via co-precipitation method with carboxyl methyl cellulose(CMC) as carbon source.XRD,SEM and galvanostatic charge-discharge analyses were used to study the samples.The sample had pure olivine structures,with particle size of about 200 nm.The initial specific discharge capacity of LiMnPO4/C at 0.05 C was 130 mAh/g,the Columbic efficiency was 80％,the capacity retention at the 20th cycle was 95％.%以羧甲基纤维素(CMC)为碳源,用共沉淀法制备碳包覆磷酸锰锂(LiMnPO4/C).用XRD、SEM及恒流充放电等方法对样品进行了研究.样品具有橄榄石晶体结构,物相较纯,粒径细小且分布均匀,一次颗粒直径约为200nm.以0.05C倍率在2.0～4.5V循环,首次放电比容量为130 mAh/g,库仑效率为80％,循环20次的容量保持率为95％.