尖晶石LiNi_(0.5)Mn_(1.5)O_4薄膜的制备及电化学研究进展

Research Progress in Synthesis and Electrochemical Properties of Spinel LiNi_(0.5)Mn_(1.5)O_4 Thin Films

系统地介绍了LiNi_(0.5)Mn_(1.5)O_4薄膜的制备方法:静电喷雾沉积、电泳沉积、溶胶凝胶、脉冲激光溅射沉积及射频磁控溅射沉积,分析了这些制备方法对LiNi_(0.5)Mn_(1.5)O_4薄膜结构和电化学性能的影响机制.其中,脉冲激光溅射沉积法和射频磁控溅射沉积法制备的薄膜因具有致密性好、附着力强、表面均匀、厚度易控等优势,近年来正逐渐受到重视.并提出通过掺杂、表面修饰、优化成膜参数、缩小晶粒尺寸、添加缓冲材料等一系列有效途径,提高LiNi_(0.5)Mn_(1.5)O_4正极薄膜的循环稳定性及锂离子扩散系数.

The preparation methods of LiNi0.5Mn1.5O4 thin-film,including electrostatic spray deposition,electro-phoretic deposition,sol- gel,pulsed laser deposition and radio frequency magnetron sputtering were reviewed.The influences mechanism of the methods on crystal structure and electrochemical properties were analyzed,respectively. It was found that the pulsed laser deposition and radio frequency magnetron sputtering have drawnmore and more attentions because of their advantages,such as high density,excellent adhesion,thicknessuniformity and easy to be handled. Finally,to further improve cycle stability and lithium-ion diffusion coefficient,we proposed several effective ways,such as doping,modifying surface,optimizing deposition parameters,reducing grain size and adding buffer layer.