Template Synthesis of Highly Dispersed LiNi_0.5Mn_1.5O₄ Thin Flakes with Improved Electrochemical Performance using Filter Paper

摘要

A highly dispersed flaky LiNi0.5Mn1.5O4 has been successfully prepared using one-step filter paperassisted templated method. The phase structures of the products were investigated by X-ray powderdiffraction (XRD) and infrared spectroscopy (FT-IR) techniques. The micro morphologies of theproducts were observed by scanning electron microscopy (SEM). The electrochemical performanceswere studied by galvanostatic charge-discharge testing, cyclic voltammetry(CV) and electrochemicalimpedance spectroscopy (EIS). The results show that both of the LiNi0.5Mn1.5O4 prepared by filterpaper assisted templated method (LNMO-FP) and the non-templated LiNi0.5Mn1.5O4 (LNMO) exhibit ahigh degree of ordered space group. The LNMO-FP shows a thin flake micro morphology, whichconsists of highly dispersed and well crystallined grains. In contrast, the LNMO sample dispays abadly agglomerate morphology. Moreover, the electrochemical performances of the LNMO-FP areobviously improved compared with the LNMO including both cycling stability and rate capability. It isbecause that the LNMO-FP sample has higher crystallinity, larger diffusion coefficients of Li+ andlower polarization.