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PVP辅助LiMn2O4包覆LiNi0.6Co0.2Mn0.2O2正极材料的制备及其电化学性能
作者:王东晨 宋美霖 罗珑玲 资冬斌 徐守磊 邓文 
单位:广西大学物理科学与工程技术学院 南宁 530004 
关键词:聚乙烯吡咯烷酮 锂离子电池 正极材料 镍钴锰酸锂 包覆 电化学性能 
分类号:TM912
出版年,卷(期):页码:2018,46(5):0-0
DOI:
摘要:
采用湿法制备了聚乙烯吡咯烷酮(PVP)辅助尖晶石型LiMn2O4包覆LiNi0.6Co0.2Mn0.2O2复合正极材料(LMO@NCM)。以X射线粉末衍射仪、扫描电子显微镜和透射电子显微镜技术对正极材料的晶体结构、形貌进行表征。采用充放电测试、电化学阻抗谱(EIS)和循环伏安法(CV)研究正极材料的电化学性能。结果表明,乙酸锰添加量为1.0%(质量分数)的LMO@NCM正极材料具有高容量、良好的倍率与循环性能。该样品0.2C首次放电容量达182.7 mAh/g,在0.5C倍率下循环50次后其容量保持率为83.7%。PVP辅助的尖晶石型LiMn2O4包覆层提高材料的电子导电率,抑制了电极界面的副反应,进而提高了材料的电化学性能。
 
基金项目:
基金项目:国家自然科学基金项目(11675043)。
作者简介:
第一作者:王东晨(1993—),男,硕士研究生。
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