Study on the cycling performance of LiNi0.5Mn1.5O4 electrodes modified by reactive SiO2 nanoparticles

Abstract

We demonstrate a facile approach to improve the cycling stability of spinel LiNi_0.5Mn_1.5O₄ materials by their surface modification. The cross-linked composite polymer electrolyte layer was formed on the surface of LiNi_0.5Mn_1.5O₄ by radical polymerization between diethylene glycol diacrylate and SiO₂ nanoparticles with reactive vinyl groups. The protective composite polymer layer formed on the LiNi_0.5Mn_1.5O₄ materials suppressed the irreversible decomposition of the electrolyte at high voltages and reduced the dissolution of transition metals from the charged LiNi_0.5Mn_1.5O₄ electrode into the electrolyte at elevated temperature, which resulted in more stable cycling characteristics than the pristine LiNi_0.5Mn_1.5O₄ electrode.