摘要
通过表面修饰改善尖晶石LiMn2O4的高温循环性能是非常有效的技术手段之一。采取极片整体修饰的方法,将N-乙烯吡咯烷酮-丙烯腈-丙烯酰胺三元共聚物,溶于N,N-二甲基甲酰胺(DMF)后与导电剂乙炔黑混合后在极片表面延流成膜。测试了修饰电极的充放电以及在常温和高温条件下的循环性能,并进行了循环伏安分析。其结果表明经修饰处理后的LiMn2O4电极显示了较好的循环稳定性,但首次充放电存在充放电平台不明显和容量偏低的现象。通过对LiMn2O4电极修饰前后进行的光电子能谱(XPS)分析,可以观察到锰离子的电子结合能发生了明显的变化,表明聚合物与极片中的活性物质之间存在相互作用。
As one of the most effective techniques, surface modifying spinel LiMn2O4 can improve its cycle performance greatly. The present research on that the tri-copolymer AN-NVP-AM was dissolved in DMF, blended with carbon black, then spread onto the whole cathode sheets. The charge-discharge and cycle performance at both room and high temperature were tested. The CVs was also analyzed. The date revealed that the cycle life was improved greatly. But the first charge and discharge plateau was not obvious. The first specific capacity was lower. The impact between the tri-copolymer and LiMn2O4 was analyzed by XPS. The XPS results showed that manganese ion of LiMn2O4 binding energy was obviously different after modified with tri-copolymer.
出处
《电源技术》
CAS
CSCD
北大核心
2005年第11期719-722,共4页
Chinese Journal of Power Sources
